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ostree/src/libostree/ostree-sysroot-deploy.c

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
*
* Copyright (C) 2012,2014 Colin Walters <walters@verbum.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gio/gunixinputstream.h>
#include <gio/gunixoutputstream.h>
#include <sys/mount.h>
#include <sys/statvfs.h>
#ifdef HAVE_LIBMOUNT
#include <libmount.h>
#endif
#include "ostree-sysroot-private.h"
#include "ostree-deployment-private.h"
#include "ostree-core-private.h"
#include "ostree-linuxfsutil.h"
#include "otutil.h"
#include "libglnx.h"
#define OSTREE_VARRELABEL_ID "da679b08acd34504b789d96f818ea781"
#define OSTREE_CONFIGMERGE_ID "d3863baec13e4449ab0384684a8af3a7"
#define OSTREE_DEPLOYMENT_COMPLETE_ID "dd440e3e549083b63d0efc7dc15255f1"
/*
* Like symlinkat() but overwrites (atomically) an existing
* symlink.
*/
static gboolean
symlink_at_replace (const char *oldpath,
int parent_dfd,
const char *newpath,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
int res;
/* Possibly in the future generate a temporary random name here,
* would need to move "generate a temporary name" code into
* libglnx or glib?
*/
g_autofree char *temppath = g_strconcat (newpath, ".tmp", NULL);
/* Clean up any stale temporary links */
(void) unlinkat (parent_dfd, temppath, 0);
/* Create the temp link */
do
res = symlinkat (oldpath, parent_dfd, temppath);
while (G_UNLIKELY (res == -1 && errno == EINTR));
if (res == -1)
{
glnx_set_error_from_errno (error);
goto out;
}
/* Rename it into place */
do
res = renameat (parent_dfd, temppath, parent_dfd, newpath);
while (G_UNLIKELY (res == -1 && errno == EINTR));
if (res == -1)
{
glnx_set_error_from_errno (error);
goto out;
}
ret = TRUE;
out:
return ret;
}
/* Try a hardlink if we can, otherwise fall back to copying. Used
* right now for kernels/initramfs in /boot, where we can just
* hardlink if we're on the same partition.
*/
static gboolean
hardlink_or_copy_at (int src_dfd,
const char *src_subpath,
int dest_dfd,
const char *dest_subpath,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
if (linkat (src_dfd, src_subpath, dest_dfd, dest_subpath, 0) != 0)
{
if (errno == EMLINK || errno == EXDEV)
{
return glnx_file_copy_at (src_dfd, src_subpath, NULL, dest_dfd, dest_subpath, 0,
cancellable, error);
}
else
{
glnx_set_error_from_errno (error);
goto out;
}
}
ret = TRUE;
out:
return ret;
}
static gboolean
dirfd_copy_attributes_and_xattrs (int src_parent_dfd,
const char *src_name,
int src_dfd,
int dest_dfd,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
struct stat src_stbuf;
g_autoptr(GVariant) xattrs = NULL;
/* Clone all xattrs first, so we get the SELinux security context
* right. This will allow other users access if they have ACLs, but
* oh well.
*/
if (!glnx_dfd_name_get_all_xattrs (src_parent_dfd, src_name,
&xattrs, cancellable, error))
goto out;
if (!glnx_fd_set_all_xattrs (dest_dfd, xattrs,
cancellable, error))
goto out;
if (fstat (src_dfd, &src_stbuf) != 0)
{
glnx_set_error_from_errno (error);
goto out;
}
if (fchown (dest_dfd, src_stbuf.st_uid, src_stbuf.st_gid) != 0)
{
glnx_set_error_from_errno (error);
goto out;
}
if (fchmod (dest_dfd, src_stbuf.st_mode) != 0)
{
glnx_set_error_from_errno (error);
goto out;
}
ret = TRUE;
out:
return ret;
}
static gboolean
copy_dir_recurse (int src_parent_dfd,
int dest_parent_dfd,
const char *name,
GCancellable *cancellable,
GError **error)
{
g_auto(GLnxDirFdIterator) src_dfd_iter = { 0, };
glnx_fd_close int dest_dfd = -1;
struct dirent *dent;
if (!glnx_dirfd_iterator_init_at (src_parent_dfd, name, TRUE, &src_dfd_iter, error))
return FALSE;
/* Create with mode 0700, we'll fchmod/fchown later */
if (mkdirat (dest_parent_dfd, name, 0700) != 0)
{
glnx_set_error_from_errno (error);
return FALSE;
}
if (!glnx_opendirat (dest_parent_dfd, name, TRUE, &dest_dfd, error))
return FALSE;
if (!dirfd_copy_attributes_and_xattrs (src_parent_dfd, name, src_dfd_iter.fd, dest_dfd,
cancellable, error))
return FALSE;
while (TRUE)
{
struct stat child_stbuf;
if (!glnx_dirfd_iterator_next_dent (&src_dfd_iter, &dent, cancellable, error))
return FALSE;
if (dent == NULL)
break;
if (fstatat (src_dfd_iter.fd, dent->d_name, &child_stbuf,
AT_SYMLINK_NOFOLLOW) != 0)
{
glnx_set_error_from_errno (error);
return FALSE;
}
if (S_ISDIR (child_stbuf.st_mode))
{
if (!copy_dir_recurse (src_dfd_iter.fd, dest_dfd, dent->d_name,
cancellable, error))
return FALSE;
}
else
{
if (!glnx_file_copy_at (src_dfd_iter.fd, dent->d_name, &child_stbuf,
dest_dfd, dent->d_name,
GLNX_FILE_COPY_OVERWRITE,
cancellable, error))
return FALSE;
}
}
return TRUE;
}
static gboolean
ensure_directory_from_template (int orig_etc_fd,
int modified_etc_fd,
int new_etc_fd,
const char *path,
int *out_dfd,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
glnx_fd_close int src_dfd = -1;
glnx_fd_close int target_dfd = -1;
g_assert (path != NULL);
g_assert (*path != '/' && *path != '\0');
if (!ot_gopendirat (modified_etc_fd, path, TRUE, &src_dfd, error))
goto out;
/* Create with mode 0700, we'll fchmod/fchown later */
again:
if (mkdirat (new_etc_fd, path, 0700) != 0)
{
if (errno == EEXIST)
{
/* Fall through */
}
else if (errno == ENOENT)
{
g_autofree char *parent_path = g_path_get_dirname (path);
if (strcmp (parent_path, ".") != 0)
{
if (!ensure_directory_from_template (orig_etc_fd, modified_etc_fd, new_etc_fd,
parent_path, NULL, cancellable, error))
goto out;
/* Loop */
goto again;
}
else
{
/* Fall through...shouldn't happen, but we'll propagate
* an error from open. */
}
}
else
{
glnx_set_error_from_errno (error);
g_prefix_error (error, "mkdirat: ");
goto out;
}
}
if (!ot_gopendirat (new_etc_fd, path, TRUE, &target_dfd, error))
goto out;
if (!dirfd_copy_attributes_and_xattrs (modified_etc_fd, path, src_dfd, target_dfd,
cancellable, error))
goto out;
ret = TRUE;
if (out_dfd)
{
g_assert (target_dfd != -1);
*out_dfd = target_dfd;
target_dfd = -1;
}
out:
return ret;
}
/**
* copy_modified_config_file:
*
* Copy @file from @modified_etc to @new_etc, overwriting any existing
* file there. The @file may refer to a regular file, a symbolic
* link, or a directory. Directories will be copied recursively.
*/
static gboolean
copy_modified_config_file (int orig_etc_fd,
int modified_etc_fd,
int new_etc_fd,
const char *path,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
struct stat modified_stbuf;
struct stat new_stbuf;
glnx_fd_close int dest_parent_dfd = -1;
if (fstatat (modified_etc_fd, path, &modified_stbuf, AT_SYMLINK_NOFOLLOW) < 0)
{
glnx_set_error_from_errno (error);
g_prefix_error (error, "Failed to read modified config file '%s': ", path);
goto out;
}
if (strchr (path, '/') != NULL)
{
g_autofree char *parent = g_path_get_dirname (path);
if (!ensure_directory_from_template (orig_etc_fd, modified_etc_fd, new_etc_fd,
parent, &dest_parent_dfd, cancellable, error))
goto out;
}
else
{
dest_parent_dfd = dup (new_etc_fd);
if (dest_parent_dfd == -1)
{
glnx_set_error_from_errno (error);
goto out;
}
}
g_assert (dest_parent_dfd != -1);
if (fstatat (new_etc_fd, path, &new_stbuf, AT_SYMLINK_NOFOLLOW) < 0)
{
if (errno == ENOENT)
;
else
{
glnx_set_error_from_errno (error);
goto out;
}
}
else if (S_ISDIR(new_stbuf.st_mode))
{
if (!S_ISDIR(modified_stbuf.st_mode))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
"Modified config file newly defaults to directory '%s', cannot merge",
path);
goto out;
}
else
{
/* Do nothing here - we assume that we've already
* recursively copied the parent directory.
*/
ret = TRUE;
goto out;
}
}
else
{
if (unlinkat (new_etc_fd, path, 0) < 0)
{
glnx_set_error_from_errno (error);
goto out;
}
}
if (S_ISDIR (modified_stbuf.st_mode))
{
if (!copy_dir_recurse (modified_etc_fd, new_etc_fd, path,
cancellable, error))
goto out;
}
else if (S_ISLNK (modified_stbuf.st_mode) || S_ISREG (modified_stbuf.st_mode))
{
if (!glnx_file_copy_at (modified_etc_fd, path, &modified_stbuf,
new_etc_fd, path,
GLNX_FILE_COPY_OVERWRITE,
cancellable, error))
goto out;
}
else
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Unsupported non-regular/non-symlink file in /etc '%s'",
path);
goto out;
}
ret = TRUE;
out:
return ret;
}
/**
* merge_etc_changes:
*
* Compute the difference between @orig_etc and @modified_etc,
* and apply that to @new_etc.
*
* The algorithm for computing the difference is pretty simple; it's
* approximately equivalent to "diff -unR orig_etc modified_etc",
* except that rather than attempting a 3-way merge if a file is also
* changed in @new_etc, the modified version always wins.
*/
static gboolean
merge_etc_changes (GFile *orig_etc,
GFile *modified_etc,
GFile *new_etc,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
g_autoptr(GPtrArray) modified = NULL;
g_autoptr(GPtrArray) removed = NULL;
g_autoptr(GPtrArray) added = NULL;
guint i;
glnx_fd_close int orig_etc_fd = -1;
glnx_fd_close int modified_etc_fd = -1;
glnx_fd_close int new_etc_fd = -1;
modified = g_ptr_array_new_with_free_func ((GDestroyNotify) ostree_diff_item_unref);
removed = g_ptr_array_new_with_free_func ((GDestroyNotify) g_object_unref);
added = g_ptr_array_new_with_free_func ((GDestroyNotify) g_object_unref);
/* For now, ignore changes to xattrs; the problem is that
* security.selinux will be different between the /usr/etc labels
* and the ones in the real /etc, so they all show up as different.
*
* This means that if you want to change the security context of a
* file, to have that change persist across upgrades, you must also
* modify the content of the file.
*/
if (!ostree_diff_dirs (OSTREE_DIFF_FLAGS_IGNORE_XATTRS,
orig_etc, modified_etc, modified, removed, added,
cancellable, error))
{
g_prefix_error (error, "While computing configuration diff: ");
goto out;
}
ot_log_structured_print_id_v (OSTREE_CONFIGMERGE_ID,
"Copying /etc changes: %u modified, %u removed, %u added",
modified->len,
removed->len,
added->len);
if (!glnx_opendirat (AT_FDCWD, gs_file_get_path_cached (orig_etc), TRUE,
&orig_etc_fd, error))
goto out;
if (!glnx_opendirat (AT_FDCWD, gs_file_get_path_cached (modified_etc), TRUE,
&modified_etc_fd, error))
goto out;
if (!glnx_opendirat (AT_FDCWD, gs_file_get_path_cached (new_etc), TRUE,
&new_etc_fd, error))
goto out;
for (i = 0; i < removed->len; i++)
{
GFile *file = removed->pdata[i];
g_autoptr(GFile) target_file = NULL;
g_autofree char *path = NULL;
path = g_file_get_relative_path (orig_etc, file);
g_assert (path);
target_file = g_file_resolve_relative_path (new_etc, path);
if (!glnx_shutil_rm_rf_at (AT_FDCWD, gs_file_get_path_cached (target_file), cancellable, error))
goto out;
}
for (i = 0; i < modified->len; i++)
{
OstreeDiffItem *diff = modified->pdata[i];
g_autofree char *path = g_file_get_relative_path (modified_etc, diff->target);
g_assert (path);
if (!copy_modified_config_file (orig_etc_fd, modified_etc_fd, new_etc_fd, path,
cancellable, error))
goto out;
}
for (i = 0; i < added->len; i++)
{
GFile *file = added->pdata[i];
g_autofree char *path = g_file_get_relative_path (modified_etc, file);
g_assert (path);
if (!copy_modified_config_file (orig_etc_fd, modified_etc_fd, new_etc_fd, path,
cancellable, error))
goto out;
}
ret = TRUE;
out:
return ret;
}
/**
* checkout_deployment_tree:
*
* Look up @revision in the repository, and check it out in
* /ostree/deploy/OS/deploy/${treecsum}.${deployserial}.
*/
static gboolean
checkout_deployment_tree (OstreeSysroot *sysroot,
OstreeRepo *repo,
OstreeDeployment *deployment,
int *out_deployment_dfd,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
OstreeRepoCheckoutAtOptions checkout_opts = { 0, };
const char *csum = ostree_deployment_get_csum (deployment);
g_autofree char *checkout_target_name = NULL;
g_autofree char *osdeploy_path = NULL;
g_autoptr(GFile) ret_deploy_target_path = NULL;
glnx_fd_close int osdeploy_dfd = -1;
int ret_fd;
osdeploy_path = g_strconcat ("ostree/deploy/", ostree_deployment_get_osname (deployment), "/deploy", NULL);
checkout_target_name = g_strdup_printf ("%s.%d", csum, ostree_deployment_get_deployserial (deployment));
if (!glnx_shutil_mkdir_p_at (sysroot->sysroot_fd, osdeploy_path, 0775, cancellable, error))
goto out;
if (!glnx_opendirat (sysroot->sysroot_fd, osdeploy_path, TRUE, &osdeploy_dfd, error))
goto out;
if (!glnx_shutil_rm_rf_at (osdeploy_dfd, checkout_target_name, cancellable, error))
goto out;
if (!ostree_repo_checkout_at (repo, &checkout_opts, osdeploy_dfd,
checkout_target_name, csum,
cancellable, error))
goto out;
if (!glnx_opendirat (osdeploy_dfd, checkout_target_name, TRUE, &ret_fd, error))
goto out;
ret = TRUE;
*out_deployment_dfd = ret_fd;
out:
return ret;
}
static char *
ptrarray_path_join (GPtrArray *path)
{
GString *path_buf;
path_buf = g_string_new ("");
if (path->len == 0)
g_string_append_c (path_buf, '/');
else
{
guint i;
for (i = 0; i < path->len; i++)
{
const char *elt = path->pdata[i];
g_string_append_c (path_buf, '/');
g_string_append (path_buf, elt);
}
}
return g_string_free (path_buf, FALSE);
}
static gboolean
relabel_one_path (OstreeSysroot *sysroot,
OstreeSePolicy *sepolicy,
GFile *path,
GFileInfo *info,
GPtrArray *path_parts,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
g_autofree char *relpath = NULL;
relpath = ptrarray_path_join (path_parts);
if (!ostree_sepolicy_restorecon (sepolicy, relpath,
info, path,
OSTREE_SEPOLICY_RESTORECON_FLAGS_ALLOW_NOLABEL,
NULL,
cancellable, error))
goto out;
ret = TRUE;
out:
return ret;
}
static gboolean
relabel_recursively (OstreeSysroot *sysroot,
OstreeSePolicy *sepolicy,
GFile *dir,
GFileInfo *dir_info,
GPtrArray *path_parts,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
g_autoptr(GFileEnumerator) direnum = NULL;
if (!relabel_one_path (sysroot, sepolicy, dir, dir_info, path_parts,
cancellable, error))
goto out;
direnum = g_file_enumerate_children (dir, OSTREE_GIO_FAST_QUERYINFO,
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
cancellable, error);
if (!direnum)
goto out;
while (TRUE)
{
GFileInfo *file_info;
GFile *child;
GFileType ftype;
if (!g_file_enumerator_iterate (direnum, &file_info, &child,
cancellable, error))
goto out;
if (file_info == NULL)
break;
g_ptr_array_add (path_parts, (char*)g_file_info_get_name (file_info));
ftype = g_file_info_get_file_type (file_info);
if (ftype == G_FILE_TYPE_DIRECTORY)
{
if (!relabel_recursively (sysroot, sepolicy, child, file_info, path_parts,
cancellable, error))
goto out;
}
else
{
if (!relabel_one_path (sysroot, sepolicy, child, file_info, path_parts,
cancellable, error))
goto out;
}
g_ptr_array_remove_index (path_parts, path_parts->len - 1);
}
ret = TRUE;
out:
return ret;
}
static gboolean
selinux_relabel_dir (OstreeSysroot *sysroot,
OstreeSePolicy *sepolicy,
GFile *dir,
const char *prefix,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
g_autoptr(GPtrArray) path_parts = g_ptr_array_new ();
g_autoptr(GFileInfo) root_info = NULL;
root_info = g_file_query_info (dir, OSTREE_GIO_FAST_QUERYINFO,
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
cancellable, error);
if (!root_info)
goto out;
g_ptr_array_add (path_parts, (char*)prefix);
if (!relabel_recursively (sysroot, sepolicy, dir, root_info, path_parts,
cancellable, error))
{
g_prefix_error (error, "Relabeling /%s: ", prefix);
goto out;
}
ret = TRUE;
out:
return ret;
}
static gboolean
selinux_relabel_file (OstreeSysroot *sysroot,
OstreeSePolicy *sepolicy,
GFile *path,
const char *prefix,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
g_autoptr(GPtrArray) path_parts = g_ptr_array_new ();
g_autoptr(GFileInfo) file_info = g_file_query_info (path, OSTREE_GIO_FAST_QUERYINFO,
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
cancellable, error);
if (!file_info)
goto out;
g_ptr_array_add (path_parts, (char*)prefix);
g_ptr_array_add (path_parts, (char*)g_file_info_get_name (file_info));
if (!relabel_one_path (sysroot, sepolicy, path, file_info, path_parts,
cancellable, error))
{
g_prefix_error (error, "Relabeling /%s/%s: ", prefix,
g_file_info_get_name (file_info));
goto out;
}
ret = TRUE;
out:
return ret;
}
static gboolean
selinux_relabel_var_if_needed (OstreeSysroot *sysroot,
OstreeSePolicy *sepolicy,
GFile *deployment_var_path,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
/* This is a bit of a hack; we should change the code at some
* point in the distant future to only create (and label) /var
* when doing a deployment.
*/
g_autoptr(GFile) deployment_var_labeled =
g_file_get_child (deployment_var_path, ".ostree-selabeled");
g_autoptr(GFile) deployment_var_labeled_tmp =
g_file_get_child (deployment_var_path, ".ostree-selabeled.tmp");
if (!g_file_query_exists (deployment_var_labeled, NULL))
{
ot_log_structured_print_id_v (OSTREE_VARRELABEL_ID,
"Relabeling /var (no stamp file '%s' found)",
gs_file_get_path_cached (deployment_var_labeled));
if (!selinux_relabel_dir (sysroot, sepolicy,
deployment_var_path, "var",
cancellable, error))
{
g_prefix_error (error, "Relabeling /var: ");
goto out;
}
if (!g_file_replace_contents (deployment_var_labeled_tmp, "", 0, NULL, FALSE,
G_FILE_CREATE_REPLACE_DESTINATION, NULL,
cancellable, error))
goto out;
if (!selinux_relabel_file (sysroot, sepolicy,
deployment_var_labeled_tmp, "var",
cancellable, error))
goto out;
if (rename (gs_file_get_path_cached (deployment_var_labeled_tmp),
gs_file_get_path_cached (deployment_var_labeled)) < 0)
{
glnx_set_error_from_errno (error);
goto out;
}
}
ret = TRUE;
out:
return ret;
}
static gboolean
merge_configuration (OstreeSysroot *sysroot,
OstreeDeployment *previous_deployment,
OstreeDeployment *deployment,
int deployment_dfd,
OstreeSePolicy **out_sepolicy,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
g_autofree char *deployment_abspath = glnx_fdrel_abspath (deployment_dfd, ".");
g_autoptr(GFile) deployment_path = g_file_new_for_path (deployment_abspath);
g_autoptr(GFile) source_etc_path = NULL;
g_autoptr(GFile) source_etc_pristine_path = NULL;
g_autoptr(GFile) deployment_usretc_path = NULL;
g_autoptr(GFile) deployment_etc_path = NULL;
glnx_unref_object OstreeSePolicy *sepolicy = NULL;
gboolean etc_exists;
gboolean usretc_exists;
if (previous_deployment)
{
g_autoptr(GFile) previous_path = NULL;
OstreeBootconfigParser *previous_bootconfig;
previous_path = ostree_sysroot_get_deployment_directory (sysroot, previous_deployment);
source_etc_path = g_file_resolve_relative_path (previous_path, "etc");
source_etc_pristine_path = g_file_resolve_relative_path (previous_path, "usr/etc");
previous_bootconfig = ostree_deployment_get_bootconfig (previous_deployment);
if (previous_bootconfig)
{
const char *previous_options = ostree_bootconfig_parser_get (previous_bootconfig, "options");
/* Completely overwrite the previous options here; we will extend
* them later.
*/
ostree_bootconfig_parser_set (ostree_deployment_get_bootconfig (deployment), "options",
previous_options);
}
}
deployment_etc_path = g_file_get_child (deployment_path, "etc");
deployment_usretc_path = g_file_resolve_relative_path (deployment_path, "usr/etc");
etc_exists = g_file_query_exists (deployment_etc_path, NULL);
usretc_exists = g_file_query_exists (deployment_usretc_path, NULL);
if (etc_exists && usretc_exists)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
"Tree contains both /etc and /usr/etc");
goto out;
}
else if (etc_exists)
{
/* Compatibility hack */
if (renameat (deployment_dfd, "etc", deployment_dfd, "usr/etc") < 0)
{
glnx_set_error_from_errno (error);
goto out;
}
usretc_exists = TRUE;
etc_exists = FALSE;
}
if (usretc_exists)
{
glnx_fd_close int deployment_usr_dfd = -1;
if (!glnx_opendirat (deployment_dfd, "usr", TRUE, &deployment_usr_dfd, error))
goto out;
/* TODO - set out labels as we copy files */
g_assert (!etc_exists);
if (!copy_dir_recurse (deployment_usr_dfd, deployment_dfd, "etc",
cancellable, error))
goto out;
/* Here, we initialize SELinux policy from the /usr/etc inside
* the root - this is before we've finalized the configuration
* merge into /etc. */
sepolicy = ostree_sepolicy_new (deployment_path, cancellable, error);
if (!sepolicy)
goto out;
if (ostree_sepolicy_get_name (sepolicy) != NULL)
{
if (!selinux_relabel_dir (sysroot, sepolicy, deployment_etc_path, "etc",
cancellable, error))
goto out;
}
}
if (source_etc_path)
{
if (!merge_etc_changes (source_etc_pristine_path, source_etc_path, deployment_etc_path,
cancellable, error))
goto out;
}
ret = TRUE;
if (out_sepolicy)
*out_sepolicy = g_steal_pointer (&sepolicy);
out:
return ret;
}
/**
* ostree_sysroot_write_origin_file:
* @sysroot: System root
* @deployment: Deployment
* @new_origin: (allow-none): Origin content
* @cancellable: Cancellable
* @error: Error
*
* Immediately replace the origin file of the referenced @deployment
* with the contents of @new_origin. If @new_origin is %NULL,
* this function will write the current origin of @deployment.
*/
gboolean
ostree_sysroot_write_origin_file (OstreeSysroot *sysroot,
OstreeDeployment *deployment,
GKeyFile *new_origin,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
GKeyFile *origin =
new_origin ? new_origin : ostree_deployment_get_origin (deployment);
if (origin)
{
g_autoptr(GFile) deployment_path = ostree_sysroot_get_deployment_directory (sysroot, deployment);
g_autoptr(GFile) origin_path = ostree_sysroot_get_deployment_origin_path (deployment_path);
g_autoptr(GFile) origin_parent = g_file_get_parent (origin_path);
g_autofree char *contents = NULL;
gsize len;
g_autoptr(GBytes) contents_bytes = NULL;
contents = g_key_file_to_data (origin, &len, error);
if (!contents)
goto out;
contents_bytes = g_bytes_new_static (contents, len);
if (!ot_gfile_replace_contents_fsync (origin_path, contents_bytes,
cancellable, error))
goto out;
if (!ot_util_fsync_directory (origin_parent, cancellable, error))
goto out;
}
ret = TRUE;
out:
return ret;
}
static gboolean
get_kernel_from_tree (int deployment_dfd,
int *out_boot_dfd,
char **out_kernel_name,
char **out_initramfs_name,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
glnx_fd_close int ret_boot_dfd = -1;
g_auto(GLnxDirFdIterator) dfditer = { 0, };
g_autofree char *ret_kernel_name = NULL;
g_autofree char *ret_initramfs_name = NULL;
g_autofree char *kernel_checksum = NULL;
g_autofree char *initramfs_checksum = NULL;
ret_boot_dfd = glnx_opendirat_with_errno (deployment_dfd, "usr/lib/ostree-boot", TRUE);
if (ret_boot_dfd == -1)
{
if (errno != ENOENT)
{
glnx_set_prefix_error_from_errno (error, "%s", "openat");
goto out;
}
else
{
if (!glnx_opendirat (deployment_dfd, "boot", TRUE, &ret_boot_dfd, error))
goto out;
}
}
if (!glnx_dirfd_iterator_init_at (ret_boot_dfd, ".", FALSE, &dfditer, error))
goto out;
while (TRUE)
{
struct dirent *dent;
if (!glnx_dirfd_iterator_next_dent (&dfditer, &dent, cancellable, error))
goto out;
if (dent == NULL)
break;
if (ret_kernel_name == NULL && g_str_has_prefix (dent->d_name, "vmlinuz-"))
{
const char *dash = strrchr (dent->d_name, '-');
g_assert (dash);
if (ostree_validate_structureof_checksum_string (dash + 1, NULL))
{
kernel_checksum = g_strdup (dash + 1);
ret_kernel_name = g_strdup (dent->d_name);
}
}
else if (ret_initramfs_name == NULL && g_str_has_prefix (dent->d_name, "initramfs-"))
{
const char *dash = strrchr (dent->d_name, '-');
g_assert (dash);
if (ostree_validate_structureof_checksum_string (dash + 1, NULL))
{
initramfs_checksum = g_strdup (dash + 1);
ret_initramfs_name = g_strdup (dent->d_name);
}
}
if (ret_kernel_name != NULL && ret_initramfs_name != NULL)
break;
}
if (ret_kernel_name == NULL)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
"Failed to find boot/vmlinuz-<CHECKSUM> in tree");
goto out;
}
if (ret_initramfs_name != NULL)
{
if (strcmp (kernel_checksum, initramfs_checksum) != 0)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
"Mismatched kernel checksum vs initrd in tree");
goto out;
}
}
*out_boot_dfd = ret_boot_dfd;
ret_boot_dfd = -1;
*out_kernel_name = g_steal_pointer (&ret_kernel_name);
*out_initramfs_name = g_steal_pointer (&ret_initramfs_name);
ret = TRUE;
out:
return ret;
}
static gboolean
checksum_from_kernel_src (const char *name,
char **out_checksum,
GError **error)
{
const char *last_dash = strrchr (name, '-');
if (!last_dash)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Malformed kernel/initramfs name '%s', missing '-'", name);
return FALSE;
}
*out_checksum = g_strdup (last_dash + 1);
return TRUE;
}
static gboolean
syncfs_dir_at (int dfd,
const char *path,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
glnx_fd_close int child_dfd = -1;
if (!glnx_opendirat (dfd, path, TRUE, &child_dfd, error))
goto out;
if (syncfs (child_dfd) != 0)
{
glnx_set_error_from_errno (error);
goto out;
}
ret = TRUE;
out:
return ret;
}
/* First, sync the root directory as well as /var and /boot which may
* be separate mount points. Then *in addition*, do a global
* `sync()`.
*/
static gboolean
full_system_sync (OstreeSysroot *self,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
if (syncfs (self->sysroot_fd) != 0)
{
glnx_set_error_from_errno (error);
goto out;
}
if (!syncfs_dir_at (self->sysroot_fd, "boot", cancellable, error))
goto out;
/* And now out of an excess of conservativism, we still invoke
* sync(). The advantage of still using `syncfs()` above is that we
* actually get error codes out of that API, and we more clearly
* delineate what we actually want to sync in the future when this
* global sync call is removed.
*/
sync ();
ret = TRUE;
out:
return ret;
}
static gboolean
create_new_bootlinks (OstreeSysroot *self,
int bootversion,
GPtrArray *new_deployments,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
guint i;
int old_subbootversion;
int new_subbootversion;
glnx_fd_close int ostree_dfd = -1;
glnx_fd_close int ostree_subbootdir_dfd = -1;
g_autofree char *ostree_bootdir_name = NULL;
g_autofree char *ostree_subbootdir_name = NULL;
if (!glnx_opendirat (self->sysroot_fd, "ostree", TRUE, &ostree_dfd, error))
goto out;
ostree_bootdir_name = g_strdup_printf ("boot.%d", bootversion);
if (bootversion != self->bootversion)
{
if (!_ostree_sysroot_read_current_subbootversion (self, bootversion, &old_subbootversion,
cancellable, error))
goto out;
}
else
old_subbootversion = self->subbootversion;
new_subbootversion = old_subbootversion == 0 ? 1 : 0;
/* Create the "subbootdir", which is a directory holding a symlink farm pointing to
* deployments per-osname.
*/
ostree_subbootdir_name = g_strdup_printf ("boot.%d.%d", bootversion, new_subbootversion);
if (!glnx_shutil_rm_rf_at (ostree_dfd, ostree_subbootdir_name, cancellable, error))
goto out;
if (!glnx_shutil_mkdir_p_at (ostree_dfd, ostree_subbootdir_name, 0755, cancellable, error))
goto out;
if (!glnx_opendirat (ostree_dfd, ostree_subbootdir_name, FALSE, &ostree_subbootdir_dfd, error))
goto out;
for (i = 0; i < new_deployments->len; i++)
{
OstreeDeployment *deployment = new_deployments->pdata[i];
g_autofree char *bootlink_parent = g_strconcat (ostree_deployment_get_osname (deployment),
"/",
ostree_deployment_get_bootcsum (deployment),
NULL);
g_autofree char *bootlink_pathname = g_strdup_printf ("%s/%d", bootlink_parent, ostree_deployment_get_bootserial (deployment));
g_autofree char *bootlink_target = g_strdup_printf ("../../../deploy/%s/deploy/%s.%d",
ostree_deployment_get_osname (deployment),
ostree_deployment_get_csum (deployment),
ostree_deployment_get_deployserial (deployment));
if (!glnx_shutil_mkdir_p_at (ostree_subbootdir_dfd, bootlink_parent, 0755, cancellable, error))
goto out;
if (!symlink_at_replace (bootlink_target, ostree_subbootdir_dfd, bootlink_pathname,
cancellable, error))
goto out;
}
ret = TRUE;
out:
return ret;
}
static gboolean
swap_bootlinks (OstreeSysroot *self,
int bootversion,
GPtrArray *new_deployments,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
int old_subbootversion, new_subbootversion;
glnx_fd_close int ostree_dfd = -1;
glnx_fd_close int ostree_subbootdir_dfd = -1;
g_autofree char *ostree_bootdir_name = NULL;
g_autofree char *ostree_subbootdir_name = NULL;
if (!glnx_opendirat (self->sysroot_fd, "ostree", TRUE, &ostree_dfd, error))
goto out;
ostree_bootdir_name = g_strdup_printf ("boot.%d", bootversion);
if (bootversion != self->bootversion)
{
if (!_ostree_sysroot_read_current_subbootversion (self, bootversion, &old_subbootversion,
cancellable, error))
goto out;
}
else
old_subbootversion = self->subbootversion;
new_subbootversion = old_subbootversion == 0 ? 1 : 0;
ostree_subbootdir_name = g_strdup_printf ("boot.%d.%d", bootversion, new_subbootversion);
if (!symlink_at_replace (ostree_subbootdir_name, ostree_dfd, ostree_bootdir_name,
cancellable, error))
goto out;
ret = TRUE;
out:
return ret;
}
static char *
remove_checksum_from_kernel_name (const char *name,
const char *csum)
{
const char *p = strrchr (name, '-');
g_assert_cmpstr (p+1, ==, csum);
return g_strndup (name, p-name);
}
static GHashTable *
parse_os_release (const char *contents,
const char *split)
{
g_autofree char **lines = g_strsplit (contents, split, -1);
char **iter;
GHashTable *ret = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
for (iter = lines; *iter; iter++)
{
g_autofree char *line = *iter;
char *eq;
const char *quotedval;
char *val;
if (g_str_has_prefix (line, "#"))
continue;
eq = strchr (line, '=');
if (!eq)
continue;
*eq = '\0';
quotedval = eq + 1;
val = g_shell_unquote (quotedval, NULL);
if (!val)
continue;
g_hash_table_insert (ret, g_steal_pointer (&line), val);
}
return ret;
}
/*
* install_deployment_kernel:
*
* Write out an entry in /boot/loader/entries for @deployment.
*/
static gboolean
install_deployment_kernel (OstreeSysroot *sysroot,
OstreeRepo *repo,
int new_bootversion,
OstreeDeployment *deployment,
guint n_deployments,
gboolean show_osname,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
struct stat stbuf;
const char *osname = ostree_deployment_get_osname (deployment);
const char *bootcsum = ostree_deployment_get_bootcsum (deployment);
g_autofree char *bootcsumdir = NULL;
g_autofree char *bootconfdir = NULL;
g_autofree char *bootconf_name = NULL;
g_autofree char *dest_kernel_name = NULL;
g_autofree char *dest_initramfs_name = NULL;
g_autofree char *tree_kernel_name = NULL;
g_autofree char *tree_initramfs_name = NULL;
g_autofree char *deployment_dirpath = NULL;
glnx_fd_close int deployment_dfd = -1;
glnx_fd_close int tree_boot_dfd = -1;
glnx_fd_close int boot_dfd = -1;
glnx_fd_close int bootcsum_dfd = -1;
g_autofree char *contents = NULL;
g_autofree char *deployment_version = NULL;
g_autoptr(GHashTable) osrelease_values = NULL;
g_autofree char *version_key = NULL;
g_autofree char *ostree_kernel_arg = NULL;
g_autofree char *options_key = NULL;
GString *title_key;
__attribute__((cleanup(_ostree_kernel_args_cleanup))) OstreeKernelArgs *kargs = NULL;
const char *val;
OstreeBootconfigParser *bootconfig;
bootconfig = ostree_deployment_get_bootconfig (deployment);
deployment_dirpath = ostree_sysroot_get_deployment_dirpath (sysroot, deployment);
if (!glnx_opendirat (sysroot->sysroot_fd, deployment_dirpath, FALSE,
&deployment_dfd, error))
goto out;
if (!get_kernel_from_tree (deployment_dfd, &tree_boot_dfd,
&tree_kernel_name, &tree_initramfs_name,
cancellable, error))
goto out;
if (!glnx_opendirat (sysroot->sysroot_fd, "boot", TRUE, &boot_dfd, error))
goto out;
bootcsumdir = g_strdup_printf ("ostree/%s-%s", osname, bootcsum);
bootconfdir = g_strdup_printf ("loader.%d/entries", new_bootversion);
bootconf_name = g_strdup_printf ("ostree-%s-%d.conf", osname,
ostree_deployment_get_index (deployment));
if (!glnx_shutil_mkdir_p_at (boot_dfd, bootcsumdir, 0775, cancellable, error))
goto out;
if (!glnx_opendirat (boot_dfd, bootcsumdir, TRUE, &bootcsum_dfd, error))
goto out;
if (!glnx_shutil_mkdir_p_at (boot_dfd, bootconfdir, 0775, cancellable, error))
goto out;
dest_kernel_name = remove_checksum_from_kernel_name (tree_kernel_name, bootcsum);
if (fstatat (bootcsum_dfd, dest_kernel_name, &stbuf, 0) != 0)
{
if (errno != ENOENT)
{
glnx_set_prefix_error_from_errno (error, "fstat %s", dest_kernel_name);
goto out;
}
if (!hardlink_or_copy_at (tree_boot_dfd, tree_kernel_name,
bootcsum_dfd, dest_kernel_name,
cancellable, error))
goto out;
}
if (tree_initramfs_name)
{
dest_initramfs_name = remove_checksum_from_kernel_name (tree_initramfs_name, bootcsum);
if (fstatat (bootcsum_dfd, dest_initramfs_name, &stbuf, 0) != 0)
{
if (errno != ENOENT)
{
glnx_set_prefix_error_from_errno (error, "fstat %s", dest_initramfs_name);
goto out;
}
if (!hardlink_or_copy_at (tree_boot_dfd, tree_initramfs_name,
bootcsum_dfd, dest_initramfs_name,
cancellable, error))
goto out;
}
}
if (fstatat (deployment_dfd, "usr/lib/os-release", &stbuf, 0) != 0)
{
if (errno != ENOENT)
{
glnx_set_error_from_errno (error);
goto out;
}
else
{
contents = glnx_file_get_contents_utf8_at (deployment_dfd, "etc/os-release", NULL,
cancellable, error);
if (!contents)
{
g_prefix_error (error, "Reading /etc/os-release: ");
goto out;
}
}
}
else
{
contents = glnx_file_get_contents_utf8_at (deployment_dfd, "usr/lib/os-release", NULL,
cancellable, error);
if (!contents)
{
g_prefix_error (error, "Reading /usr/lib/os-release: ");
goto out;
}
}
osrelease_values = parse_os_release (contents, "\n");
/* title */
val = g_hash_table_lookup (osrelease_values, "PRETTY_NAME");
if (val == NULL)
val = g_hash_table_lookup (osrelease_values, "ID");
if (val == NULL)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"No PRETTY_NAME or ID in /etc/os-release");
goto out;
}
if (repo)
{
/* Try extracting a version for this deployment. */
const char *csum = ostree_deployment_get_csum (deployment);
g_autoptr(GVariant) variant = NULL;
g_autoptr(GVariant) metadata = NULL;
/* XXX Copying ot_admin_checksum_version() + bits from
* ot-admin-builtin-status.c. Maybe this should be
* public API in libostree? */
if (ostree_repo_load_variant (repo, OSTREE_OBJECT_TYPE_COMMIT, csum,
&variant, NULL))
{
metadata = g_variant_get_child_value (variant, 0);
g_variant_lookup (metadata, "version", "s", &deployment_version);
}
}
/* XXX The SYSLINUX bootloader backend actually parses the title string
* (specifically, it looks for the substring "(ostree"), so further
* changes to the title format may require updating that backend. */
title_key = g_string_new (val);
if (deployment_version && *deployment_version)
{
g_string_append_c (title_key, ' ');
g_string_append (title_key, deployment_version);
}
g_string_append (title_key, " (ostree");
if (show_osname)
{
g_string_append_c (title_key, ':');
g_string_append (title_key, osname);
}
if (!(deployment_version && *deployment_version))
{
g_string_append_printf (title_key, ":%d", ostree_deployment_get_index (deployment));
}
g_string_append_c (title_key, ')');
ostree_bootconfig_parser_set (bootconfig, "title", title_key->str);
g_string_free (title_key, TRUE);
version_key = g_strdup_printf ("%d", n_deployments - ostree_deployment_get_index (deployment));
ostree_bootconfig_parser_set (bootconfig, "version", version_key);
{ g_autofree char * boot_relpath = g_strconcat ("/", bootcsumdir, "/", dest_kernel_name, NULL);
ostree_bootconfig_parser_set (bootconfig, "linux", boot_relpath);
}
if (dest_initramfs_name)
{
g_autofree char * boot_relpath = g_strconcat ("/", bootcsumdir, "/", dest_initramfs_name, NULL);
ostree_bootconfig_parser_set (bootconfig, "initrd", boot_relpath);
}
val = ostree_bootconfig_parser_get (bootconfig, "options");
ostree_kernel_arg = g_strdup_printf ("ostree=/ostree/boot.%d/%s/%s/%d",
new_bootversion, osname, bootcsum,
ostree_deployment_get_bootserial (deployment));
kargs = _ostree_kernel_args_from_string (val);
_ostree_kernel_args_replace_take (kargs, ostree_kernel_arg);
ostree_kernel_arg = NULL;
options_key = _ostree_kernel_args_to_string (kargs);
ostree_bootconfig_parser_set (bootconfig, "options", options_key);
{ glnx_fd_close int bootconf_dfd = -1;
if (!glnx_opendirat (boot_dfd, bootconfdir, TRUE, &bootconf_dfd, error))
goto out;
if (!ostree_bootconfig_parser_write_at (ostree_deployment_get_bootconfig (deployment),
bootconf_dfd, bootconf_name,
cancellable, error))
goto out;
}
ret = TRUE;
out:
return ret;
}
static gboolean
prepare_new_bootloader_link (OstreeSysroot *sysroot,
int current_bootversion,
int new_bootversion,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
g_autofree char *new_target = NULL;
g_assert ((current_bootversion == 0 && new_bootversion == 1) ||
(current_bootversion == 1 && new_bootversion == 0));
new_target = g_strdup_printf ("loader.%d", new_bootversion);
/* We shouldn't actually need to replace but it's easier to reuse
that code */
if (!symlink_at_replace (new_target, sysroot->sysroot_fd, "boot/loader.tmp",
cancellable, error))
goto out;
ret = TRUE;
out:
return ret;
}
static gboolean
swap_bootloader (OstreeSysroot *sysroot,
int current_bootversion,
int new_bootversion,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
glnx_fd_close int boot_dfd = -1;
int res;
g_assert ((current_bootversion == 0 && new_bootversion == 1) ||
(current_bootversion == 1 && new_bootversion == 0));
if (!glnx_opendirat (sysroot->sysroot_fd, "boot", TRUE, &boot_dfd, error))
goto out;
/* The symlink was already written, and we used syncfs() to ensure
* its data is in place. Renaming now should give us atomic semantics;
* see https://bugzilla.gnome.org/show_bug.cgi?id=755595
*/
do
res = renameat (boot_dfd, "loader.tmp", boot_dfd, "loader");
while (G_UNLIKELY (res == -1 && errno == EINTR));
if (res == -1)
{
glnx_set_error_from_errno (error);
goto out;
}
/* Now we explicitly fsync this directory, even though it
* isn't required for atomicity, for two reasons:
* - It should be very cheap as we're just syncing whatever
* data was written since the last sync which was hopefully
* less than a second ago.
* - It should be sync'd before shutdown as that could crash
* for whatever reason, and we wouldn't want to confuse the
* admin by going back to the previous session.
*/
if (fsync (boot_dfd) != 0)
{
glnx_set_error_from_errno (error);
goto out;
}
ret = TRUE;
out:
return ret;
}
static GHashTable *
assign_bootserials (GPtrArray *deployments)
{
guint i;
GHashTable *ret =
g_hash_table_new_full (g_str_hash, g_str_equal, NULL, NULL);
for (i = 0; i < deployments->len; i++)
{
OstreeDeployment *deployment = deployments->pdata[i];
const char *bootcsum = ostree_deployment_get_bootcsum (deployment);
guint count;
count = GPOINTER_TO_UINT (g_hash_table_lookup (ret, bootcsum));
g_hash_table_replace (ret, (char*) bootcsum,
GUINT_TO_POINTER (count + 1));
ostree_deployment_set_bootserial (deployment, count);
}
return ret;
}
static gboolean
deployment_bootconfigs_equal (OstreeDeployment *a,
OstreeDeployment *b)
{
const char *a_bootcsum = ostree_deployment_get_bootcsum (a);
const char *b_bootcsum = ostree_deployment_get_bootcsum (b);
if (strcmp (a_bootcsum, b_bootcsum) != 0)
return FALSE;
{
OstreeBootconfigParser *a_bootconfig = ostree_deployment_get_bootconfig (a);
OstreeBootconfigParser *b_bootconfig = ostree_deployment_get_bootconfig (b);
const char *a_boot_options = ostree_bootconfig_parser_get (a_bootconfig, "options");
const char *b_boot_options = ostree_bootconfig_parser_get (b_bootconfig, "options");
__attribute__((cleanup(_ostree_kernel_args_cleanup))) OstreeKernelArgs *a_kargs = NULL;
__attribute__((cleanup(_ostree_kernel_args_cleanup))) OstreeKernelArgs *b_kargs = NULL;
g_autofree char *a_boot_options_without_ostree = NULL;
g_autofree char *b_boot_options_without_ostree = NULL;
/* We checksum the kernel arguments *except* ostree= */
a_kargs = _ostree_kernel_args_from_string (a_boot_options);
_ostree_kernel_args_replace (a_kargs, "ostree");
a_boot_options_without_ostree = _ostree_kernel_args_to_string (a_kargs);
b_kargs = _ostree_kernel_args_from_string (b_boot_options);
_ostree_kernel_args_replace (b_kargs, "ostree");
b_boot_options_without_ostree = _ostree_kernel_args_to_string (b_kargs);
if (strcmp (a_boot_options_without_ostree, b_boot_options_without_ostree) != 0)
return FALSE;
}
return TRUE;
}
/* This used to be a temporary hack to create "current" symbolic link
* that's easy to follow inside the gnome-ostree build scripts (now
* gnome-continuous). It wasn't atomic, and nowadays people can use
* the OSTree API to find deployments.
*/
static gboolean
cleanup_legacy_current_symlinks (OstreeSysroot *self,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
guint i;
g_autoptr(GHashTable) created_current_for_osname =
g_hash_table_new (g_str_hash, g_str_equal);
for (i = 0; i < self->deployments->len; i++)
{
OstreeDeployment *deployment = self->deployments->pdata[i];
const char *osname = ostree_deployment_get_osname (deployment);
g_autoptr(GFile) osdir = ot_gfile_resolve_path_printf (self->path, "ostree/deploy/%s", osname);
g_autoptr(GFile) legacy_link = g_file_get_child (osdir, "current");
if (!ot_gfile_ensure_unlinked (legacy_link, cancellable, error))
goto out;
}
ret = TRUE;
out:
return ret;
}
static gboolean
is_ro_mount (const char *path)
{
#ifdef HAVE_LIBMOUNT
/* Dragging in all of this crud is apparently necessary just to determine
* whether something is a mount point.
*
* Systemd has a totally different implementation in
* src/basic/mount-util.c.
*/
struct libmnt_table *tb = mnt_new_table_from_file ("/proc/self/mountinfo");
struct libmnt_fs *fs;
struct libmnt_cache *cache;
gboolean is_mount = FALSE;
struct statvfs stvfsbuf;
if (!tb)
return FALSE;
/* to canonicalize all necessary paths */
cache = mnt_new_cache ();
mnt_table_set_cache (tb, cache);
fs = mnt_table_find_target(tb, path, MNT_ITER_BACKWARD);
is_mount = fs && mnt_fs_get_target (fs);
mnt_free_cache (cache);
mnt_free_table (tb);
if (!is_mount)
return FALSE;
/* We *could* parse the options, but it seems more reliable to
* introspect the actual mount at runtime.
*/
if (statvfs (path, &stvfsbuf) == 0)
return (stvfsbuf.f_flag & ST_RDONLY) != 0;
#endif
return FALSE;
}
/**
* ostree_sysroot_write_deployments:
* @self: Sysroot
* @new_deployments: (element-type OstreeDeployment): List of new deployments
* @cancellable: Cancellable
* @error: Error
*
* Assuming @new_deployments have already been deployed in place on
* disk, atomically update bootloader configuration.
*/
gboolean
ostree_sysroot_write_deployments (OstreeSysroot *self,
GPtrArray *new_deployments,
GCancellable *cancellable,
GError **error)
{
return _ostree_sysroot_write_deployments_internal (self, new_deployments,
OSTREE_SYSROOT_CLEANUP_ALL,
cancellable, error);
}
gboolean
_ostree_sysroot_write_deployments_internal (OstreeSysroot *self,
GPtrArray *new_deployments,
OstreeSysrootCleanupFlags cleanup_flags,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
guint i;
gboolean requires_new_bootversion = FALSE;
gboolean found_booted_deployment = FALSE;
gboolean bootloader_is_atomic = FALSE;
gboolean boot_was_ro_mount = FALSE;
g_assert (self->loaded);
/* Assign a bootserial to each new deployment.
*/
assign_bootserials (new_deployments);
/* Determine whether or not we need to touch the bootloader
* configuration. If we have an equal number of deployments with
* matching bootloader configuration, then we can just swap the
* subbootversion bootlinks.
*/
if (new_deployments->len != self->deployments->len)
requires_new_bootversion = TRUE;
else
{
for (i = 0; i < new_deployments->len; i++)
{
if (!deployment_bootconfigs_equal (new_deployments->pdata[i],
self->deployments->pdata[i]))
{
requires_new_bootversion = TRUE;
break;
}
}
}
for (i = 0; i < new_deployments->len; i++)
{
OstreeDeployment *deployment = new_deployments->pdata[i];
g_autoptr(GFile) deployment_root = NULL;
if (deployment == self->booted_deployment)
found_booted_deployment = TRUE;
deployment_root = ostree_sysroot_get_deployment_directory (self, deployment);
if (!g_file_query_exists (deployment_root, NULL))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Unable to find expected deployment root: %s",
gs_file_get_path_cached (deployment_root));
goto out;
}
ostree_deployment_set_index (deployment, i);
}
if (self->booted_deployment && !found_booted_deployment)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, "Attempting to remove booted deployment");
goto out;
}
if (!requires_new_bootversion)
{
if (!create_new_bootlinks (self, self->bootversion,
new_deployments,
cancellable, error))
{
g_prefix_error (error, "Creating new current bootlinks: ");
goto out;
}
if (!full_system_sync (self, cancellable, error))
{
g_prefix_error (error, "Full sync: ");
goto out;
}
if (!swap_bootlinks (self, self->bootversion,
new_deployments,
cancellable, error))
{
g_prefix_error (error, "Swapping current bootlinks: ");
goto out;
}
bootloader_is_atomic = TRUE;
}
else
{
int new_bootversion = self->bootversion ? 0 : 1;
glnx_unref_object OstreeBootloader *bootloader = NULL;
g_autoptr(GFile) new_loader_entries_dir = NULL;
glnx_unref_object OstreeRepo *repo = NULL;
gboolean show_osname = FALSE;
if (self->booted_deployment)
boot_was_ro_mount = is_ro_mount ("/boot");
g_debug ("boot is ro: %s", boot_was_ro_mount ? "yes" : "no");
if (boot_was_ro_mount)
{
if (mount ("/boot", "/boot", NULL, MS_REMOUNT | MS_SILENT, NULL) < 0)
{
glnx_set_prefix_error_from_errno (error, "%s", "Remounting /boot read-write");
goto out;
}
}
if (!_ostree_sysroot_query_bootloader (self, &bootloader, cancellable, error))
goto out;
new_loader_entries_dir = ot_gfile_resolve_path_printf (self->path, "boot/loader.%d/entries",
new_bootversion);
if (!glnx_shutil_rm_rf_at (AT_FDCWD, gs_file_get_path_cached (new_loader_entries_dir), cancellable, error))
goto out;
if (!ot_util_ensure_directory_and_fsync (new_loader_entries_dir, cancellable, error))
goto out;
/* Need the repo to try and extract the versions for deployments.
* But this is a "nice-to-have" for the bootloader UI, so failure
* here is not fatal to the whole operation. We just gracefully
* fall back to the deployment index. */
(void) ostree_sysroot_get_repo (self, &repo, cancellable, NULL);
/* Only show the osname in bootloader titles if there are multiple
* osname's among the new deployments. Check for that here. */
for (i = 1; i < new_deployments->len; i++)
{
const gchar *osname_0, *osname_i;
osname_0 = ostree_deployment_get_osname (new_deployments->pdata[0]);
osname_i = ostree_deployment_get_osname (new_deployments->pdata[i]);
if (!g_str_equal (osname_0, osname_i))
{
show_osname = TRUE;
break;
}
}
for (i = 0; i < new_deployments->len; i++)
{
OstreeDeployment *deployment = new_deployments->pdata[i];
if (!install_deployment_kernel (self, repo, new_bootversion,
deployment, new_deployments->len,
show_osname, cancellable, error))
{
g_prefix_error (error, "Installing kernel: ");
goto out;
}
}
/* Create and swap bootlinks for *new* version */
if (!create_new_bootlinks (self, new_bootversion,
new_deployments,
cancellable, error))
{
g_prefix_error (error, "Creating new version bootlinks: ");
goto out;
}
if (!swap_bootlinks (self, new_bootversion, new_deployments,
cancellable, error))
{
g_prefix_error (error, "Swapping new version bootlinks: ");
goto out;
}
g_debug ("Using bootloader: %s", bootloader ?
g_type_name (G_TYPE_FROM_INSTANCE (bootloader)) : "(none)");
if (bootloader)
bootloader_is_atomic = _ostree_bootloader_is_atomic (bootloader);
if (bootloader)
{
if (!_ostree_bootloader_write_config (bootloader, new_bootversion,
cancellable, error))
{
g_prefix_error (error, "Bootloader write config: ");
goto out;
}
}
if (!prepare_new_bootloader_link (self, self->bootversion, new_bootversion,
cancellable, error))
{
g_prefix_error (error, "Preparing final bootloader swap: ");
goto out;
}
if (!full_system_sync (self, cancellable, error))
{
g_prefix_error (error, "Full sync: ");
goto out;
}
if (!swap_bootloader (self, self->bootversion, new_bootversion,
cancellable, error))
{
g_prefix_error (error, "Final bootloader swap: ");
goto out;
}
}
ot_log_structured_print_id_v (OSTREE_DEPLOYMENT_COMPLETE_ID,
"%s; bootconfig swap: %s deployment count change: %i",
(bootloader_is_atomic ? "Transaction complete" : "Bootloader updated"),
requires_new_bootversion ? "yes" : "no",
new_deployments->len - self->deployments->len);
if (!_ostree_sysroot_bump_mtime (self, error))
goto out;
/* Now reload from disk */
if (!ostree_sysroot_load (self, cancellable, error))
{
g_prefix_error (error, "Reloading deployments after commit: ");
goto out;
}
if (!cleanup_legacy_current_symlinks (self, cancellable, error))
goto out;
/* And finally, cleanup of any leftover data.
*/
if (!_ostree_sysroot_piecemeal_cleanup (self, cleanup_flags,
cancellable, error))
{
g_prefix_error (error, "Performing final cleanup: ");
goto out;
}
ret = TRUE;
out:
if (boot_was_ro_mount)
{
if (mount ("/boot", "/boot", NULL, MS_REMOUNT | MS_RDONLY | MS_SILENT, NULL) < 0)
{
/* Only make this a warning because we don't want to
* completely bomb out if some other process happened to
* jump in and open a file there.
*/
int errsv = errno;
g_printerr ("warning: Failed to remount /boot read-only: %s\n", strerror (errsv));
}
}
return ret;
}
static gboolean
allocate_deployserial (OstreeSysroot *self,
const char *osname,
const char *revision,
int *out_deployserial,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
guint i;
int new_deployserial = 0;
g_autoptr(GFile) osdir = NULL;
g_autoptr(GPtrArray) tmp_current_deployments =
g_ptr_array_new_with_free_func (g_object_unref);
osdir = ot_gfile_get_child_build_path (self->path, "ostree/deploy", osname, NULL);
if (!_ostree_sysroot_list_deployment_dirs_for_os (osdir, tmp_current_deployments,
cancellable, error))
goto out;
for (i = 0; i < tmp_current_deployments->len; i++)
{
OstreeDeployment *deployment = tmp_current_deployments->pdata[i];
if (strcmp (ostree_deployment_get_osname (deployment), osname) != 0)
continue;
if (strcmp (ostree_deployment_get_csum (deployment), revision) != 0)
continue;
new_deployserial = MAX(new_deployserial, ostree_deployment_get_deployserial (deployment)+1);
}
ret = TRUE;
*out_deployserial = new_deployserial;
out:
return ret;
}
/**
* ostree_sysroot_deploy_tree:
* @self: Sysroot
* @osname: (allow-none): osname to use for merge deployment
* @revision: Checksum to add
* @origin: (allow-none): Origin to use for upgrades
* @provided_merge_deployment: (allow-none): Use this deployment for merge path
* @override_kernel_argv: (allow-none) (array zero-terminated=1) (element-type utf8): Use these as kernel arguments; if %NULL, inherit options from provided_merge_deployment
* @out_new_deployment: (out): The new deployment path
* @cancellable: Cancellable
* @error: Error
*
* Check out deployment tree with revision @revision, performing a 3
* way merge with @provided_merge_deployment for configuration.
*/
gboolean
ostree_sysroot_deploy_tree (OstreeSysroot *self,
const char *osname,
const char *revision,
GKeyFile *origin,
OstreeDeployment *provided_merge_deployment,
char **override_kernel_argv,
OstreeDeployment **out_new_deployment,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
gint new_deployserial;
glnx_unref_object OstreeDeployment *new_deployment = NULL;
glnx_unref_object OstreeDeployment *merge_deployment = NULL;
glnx_unref_object OstreeRepo *repo = NULL;
g_autoptr(GFile) osdeploydir = NULL;
g_autoptr(GFile) deployment_var = NULL;
glnx_fd_close int tree_boot_dfd = -1;
g_autofree char *tree_kernel_path = NULL;
g_autofree char *tree_initramfs_path = NULL;
glnx_fd_close int deployment_dfd = -1;
glnx_unref_object OstreeSePolicy *sepolicy = NULL;
g_autofree char *new_bootcsum = NULL;
glnx_unref_object OstreeBootconfigParser *bootconfig = NULL;
g_return_val_if_fail (osname != NULL || self->booted_deployment != NULL, FALSE);
if (osname == NULL)
osname = ostree_deployment_get_osname (self->booted_deployment);
osdeploydir = ot_gfile_get_child_build_path (self->path, "ostree", "deploy", osname, NULL);
if (!g_file_query_exists (osdeploydir, NULL))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
"No OS named \"%s\" known", osname);
goto out;
}
deployment_var = g_file_get_child (osdeploydir, "var");
if (!ostree_sysroot_get_repo (self, &repo, cancellable, error))
goto out;
if (provided_merge_deployment != NULL)
merge_deployment = g_object_ref (provided_merge_deployment);
if (!allocate_deployserial (self, osname, revision, &new_deployserial,
cancellable, error))
goto out;
new_deployment = ostree_deployment_new (0, osname, revision, new_deployserial,
new_bootcsum, -1);
ostree_deployment_set_origin (new_deployment, origin);
/* Check out the userspace tree onto the filesystem */
if (!checkout_deployment_tree (self, repo, new_deployment, &deployment_dfd,
cancellable, error))
{
g_prefix_error (error, "Checking out tree: ");
goto out;
}
if (!get_kernel_from_tree (deployment_dfd, &tree_boot_dfd,
&tree_kernel_path, &tree_initramfs_path,
cancellable, error))
goto out;
if (tree_initramfs_path != NULL)
{
if (!checksum_from_kernel_src (tree_initramfs_path, &new_bootcsum, error))
goto out;
}
else
{
if (!checksum_from_kernel_src (tree_kernel_path, &new_bootcsum, error))
goto out;
}
_ostree_deployment_set_bootcsum (new_deployment, new_bootcsum);
/* Create an empty boot configuration; we will merge things into
* it as we go.
*/
bootconfig = ostree_bootconfig_parser_new ();
ostree_deployment_set_bootconfig (new_deployment, bootconfig);
if (!merge_configuration (self, merge_deployment, new_deployment,
deployment_dfd,
&sepolicy,
cancellable, error))
{
g_prefix_error (error, "During /etc merge: ");
goto out;
}
g_clear_object (&self->sepolicy);
self->sepolicy = g_object_ref (sepolicy);
if (!selinux_relabel_var_if_needed (self, sepolicy, deployment_var,
cancellable, error))
goto out;
if (!(self->debug_flags & OSTREE_SYSROOT_DEBUG_MUTABLE_DEPLOYMENTS))
{
if (!ostree_sysroot_deployment_set_mutable (self, new_deployment, FALSE,
cancellable, error))
goto out;
}
{ ostree_cleanup_sepolicy_fscreatecon gpointer dummy = NULL;
/* Explicitly override the label for the origin file to ensure
* it's system_conf_t.
*/
if (self->sepolicy != NULL
&& ostree_sepolicy_get_name (self->sepolicy) != NULL)
{
if (!ostree_sepolicy_setfscreatecon (self->sepolicy,
"/etc/ostree/remotes.d/dummy.conf",
0644,
error))
goto out;
}
if (!ostree_sysroot_write_origin_file (self, new_deployment, NULL,
cancellable, error))
{
g_prefix_error (error, "Writing out origin file: ");
goto out;
}
}
/* After this, install_deployment_kernel() will set the other boot
* options and write it out to disk.
*/
if (override_kernel_argv)
{
__attribute__((cleanup(_ostree_kernel_args_cleanup))) OstreeKernelArgs *kargs = NULL;
g_autofree char *new_options = NULL;
kargs = _ostree_kernel_args_new ();
_ostree_kernel_args_append_argv (kargs, override_kernel_argv);
new_options = _ostree_kernel_args_to_string (kargs);
ostree_bootconfig_parser_set (bootconfig, "options", new_options);
}
ret = TRUE;
ot_transfer_out_value (out_new_deployment, &new_deployment);
out:
return ret;
}
/**
* ostree_sysroot_deployment_set_kargs:
* @self: Sysroot
* @deployment: A deployment
* @new_kargs: (array zero-terminated=1) (element-type utf8): Replace deployment's kernel arguments
* @cancellable: Cancellable
* @error: Error
*
* Entirely replace the kernel arguments of @deployment with the
* values in @new_kargs.
*/
gboolean
ostree_sysroot_deployment_set_kargs (OstreeSysroot *self,
OstreeDeployment *deployment,
char **new_kargs,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
guint i;
g_autoptr(GPtrArray) new_deployments = g_ptr_array_new_with_free_func (g_object_unref);
glnx_unref_object OstreeDeployment *new_deployment = NULL;
__attribute__((cleanup(_ostree_kernel_args_cleanup))) OstreeKernelArgs *kargs = NULL;
g_autofree char *new_options = NULL;
OstreeBootconfigParser *new_bootconfig;
new_deployment = ostree_deployment_clone (deployment);
new_bootconfig = ostree_deployment_get_bootconfig (new_deployment);
kargs = _ostree_kernel_args_new ();
_ostree_kernel_args_append_argv (kargs, new_kargs);
new_options = _ostree_kernel_args_to_string (kargs);
ostree_bootconfig_parser_set (new_bootconfig, "options", new_options);
for (i = 0; i < self->deployments->len; i++)
{
OstreeDeployment *cur = self->deployments->pdata[i];
if (cur == deployment)
g_ptr_array_add (new_deployments, g_object_ref (new_deployment));
else
g_ptr_array_add (new_deployments, g_object_ref (cur));
}
if (!ostree_sysroot_write_deployments (self, new_deployments,
cancellable, error))
goto out;
ret = TRUE;
out:
return ret;
}
/**
* ostree_sysroot_deployment_set_mutable:
* @self: Sysroot
* @deployment: A deployment
* @is_mutable: Whether or not deployment's files can be changed
* @error: Error
*
* By default, deployment directories are not mutable. This function
* will allow making them temporarily mutable, for example to allow
* layering additional non-OSTree content.
*/
gboolean
ostree_sysroot_deployment_set_mutable (OstreeSysroot *self,
OstreeDeployment *deployment,
gboolean is_mutable,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
g_autofree char *deployment_path = ostree_sysroot_get_deployment_dirpath (self, deployment);
glnx_fd_close int fd = -1;
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return FALSE;
if (!glnx_opendirat (self->sysroot_fd, deployment_path, TRUE, &fd, error))
goto out;
if (!_ostree_linuxfs_fd_alter_immutable_flag (fd, !is_mutable, cancellable, error))
goto out;
ret = TRUE;
out:
return ret;
}
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