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grub2: Use g_spawn_sync() rather than GSubprocess to avoid SIGCHLD 

Due to the async nature of `GSubprocess` it grabs `SIGCHLD` which
affects other software which might be using libostree, such as
QtOTA.

Closes: https://github.com/ostreedev/ostree/issues/696

Closes: #702
Approved by: jlebon
This commit is contained in:
Colin Walters 2017-02-22 11:33:38 -05:00 committed by Atomic Bot
parent 36b28cb4d2
commit 9695c47684
1 changed files with 37 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
src/libostree/ostree-bootloader-grub2.c
View File

@ -239,12 +239,26 @@ _ostree_bootloader_grub2_generate_config (OstreeSysroot *sysroot
return ret;
}
typedef struct {
const char *root;
const char *bootversion_str;
gboolean is_efi;
} Grub2ChildSetupData;
static void
grub2_child_setup (gpointer user_data)
{
const char *root = user_data;
Grub2ChildSetupData *cdata = user_data;
if (chdir (root) != 0)
setenv ("_OSTREE_GRUB2_BOOTVERSION", cdata->bootversion_str, TRUE);
/* We have to pass our state to the child */
if (cdata->is_efi)
setenv ("_OSTREE_GRUB2_IS_EFI", "1", TRUE);
if (!cdata->root)
return;
if (chdir (cdata->root) != 0)
{
perror ("chdir");
_exit (1);
@ -268,7 +282,7 @@ grub2_child_setup (gpointer user_data)
_exit (1);
}
if (mount (root, "/", NULL, MS_MOVE, NULL) < 0)
if (mount (cdata->root, "/", NULL, MS_MOVE, NULL) < 0)
{
perror ("failed to MS_MOVE to /");
_exit (1);
@ -290,14 +304,15 @@ _ostree_bootloader_grub2_write_config (OstreeBootloader *bootloader,
OstreeBootloaderGrub2 *self = OSTREE_BOOTLOADER_GRUB2 (bootloader);
gboolean ret = FALSE;
g_autoptr(GFile) new_config_path = NULL;
GSubprocessFlags subp_flags = 0;
glnx_unref_object GSubprocessLauncher *launcher = NULL;
glnx_unref_object GSubprocess *proc = NULL;
g_autofree char *bootversion_str = g_strdup_printf ("%u", (guint)bootversion);
g_autoptr(GFile) config_path_efi_dir = NULL;
g_autofree char *grub2_mkconfig_chroot = NULL;
gboolean use_system_grub2_mkconfig = TRUE;
const gchar *grub_exec = NULL;
const char *grub_argv[4] = { NULL, "-o", NULL, NULL};
GSpawnFlags grub_spawnflags = G_SPAWN_SEARCH_PATH;
int grub2_estatus;
Grub2ChildSetupData cdata = { NULL, };
#ifdef USE_BUILTIN_GRUB2_MKCONFIG
use_system_grub2_mkconfig = FALSE;
@ -354,22 +369,15 @@ _ostree_bootloader_grub2_write_config (OstreeBootloader *bootloader,
bootversion);
}
grub_argv[0] = grub_exec;
grub_argv[2] = gs_file_get_path_cached (new_config_path);
if (!g_getenv ("OSTREE_DEBUG_GRUB2"))
subp_flags |= (G_SUBPROCESS_FLAGS_STDOUT_SILENCE | G_SUBPROCESS_FLAGS_STDERR_SILENCE);
launcher = g_subprocess_launcher_new (subp_flags);
g_subprocess_launcher_setenv (launcher, "_OSTREE_GRUB2_BOOTVERSION", bootversion_str, TRUE);
/* We have to pass our state to the child */
if (self->is_efi)
g_subprocess_launcher_setenv (launcher, "_OSTREE_GRUB2_IS_EFI", "1", TRUE);
/* We need to chroot() if we're not in /. This assumes our caller has
* set up the bind mounts outside.
*/
if (grub2_mkconfig_chroot != NULL)
g_subprocess_launcher_set_child_setup (launcher, grub2_child_setup, grub2_mkconfig_chroot, NULL);
/* In the current Fedora grub2 package, this script doesn't even try
grub_spawnflags |= G_SPAWN_STDOUT_TO_DEV_NULL | G_SPAWN_STDERR_TO_DEV_NULL;
cdata.root = grub2_mkconfig_chroot;
cdata.bootversion_str = bootversion_str;
cdata.is_efi = self->is_efi;
/* Note in older versions of the grub2 package, this script doesn't even try
to be atomic; it just does:
cat ${grub_cfg}.new > ${grub_cfg}
@ -377,13 +385,15 @@ _ostree_bootloader_grub2_write_config (OstreeBootloader *bootloader,
Upstream is fixed though.
*/
proc = g_subprocess_launcher_spawn (launcher, error,
grub_exec, "-o",
gs_file_get_path_cached (new_config_path),
NULL);
if (!g_subprocess_wait_check (proc, cancellable, error))
if (!g_spawn_sync (NULL, (char**)grub_argv, NULL, grub_spawnflags,
grub2_child_setup, &cdata, NULL, NULL,
&grub2_estatus, error))
goto out;
if (!g_spawn_check_exit_status (grub2_estatus, error))
{
g_prefix_error (error, "%s: ", grub_argv[0]);
goto out;
}
/* Now let's fdatasync() for the new file */
{ glnx_fd_close int new_config_fd = open (gs_file_get_path_cached (new_config_path), O_RDONLY | O_CLOEXEC);