libostree: Move a lot more sysroot API here
OstreeBootloader is temporarily public API.
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Colin Walters committed
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
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*
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* Copyright (C) 2013 Colin Walters <walters@verbum.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2 of the licence or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include "ostree-sysroot-private.h"
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#include "ostree-bootloader-syslinux.h"
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#include "otutil.h"
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#include "libgsystem.h"
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#include <string.h>
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struct _OstreeBootloaderSyslinux
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{
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GObject parent_instance;
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OstreeSysroot *sysroot;
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GFile *config_path;
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};
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typedef GObjectClass OstreeBootloaderSyslinuxClass;
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static void ostree_bootloader_syslinux_bootloader_iface_init (OstreeBootloaderInterface *iface);
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G_DEFINE_TYPE_WITH_CODE (OstreeBootloaderSyslinux, ostree_bootloader_syslinux, G_TYPE_OBJECT,
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G_IMPLEMENT_INTERFACE (OSTREE_TYPE_BOOTLOADER, ostree_bootloader_syslinux_bootloader_iface_init));
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static gboolean
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ostree_bootloader_syslinux_query (OstreeBootloader *bootloader)
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{
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OstreeBootloaderSyslinux *self = OSTREE_BOOTLOADER_SYSLINUX (bootloader);
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return g_file_query_file_type (self->config_path, G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS, NULL) == G_FILE_TYPE_SYMBOLIC_LINK;
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}
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static const char *
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ostree_bootloader_syslinux_get_name (OstreeBootloader *bootloader)
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{
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return "syslinux";
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}
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static gboolean
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append_config_from_boostree_loader_entries (OstreeBootloaderSyslinux *self,
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gboolean regenerate_default,
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int bootversion,
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GPtrArray *new_lines,
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GCancellable *cancellable,
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GError **error)
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{
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gboolean ret = FALSE;
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gs_unref_ptrarray GPtrArray *boostree_loader_configs = NULL;
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guint i;
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if (!_ostree_sysroot_read_boot_loader_configs (self->sysroot, bootversion, &boostree_loader_configs,
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cancellable, error))
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goto out;
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for (i = 0; i < boostree_loader_configs->len; i++)
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{
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OstreeBootconfigParser *config = boostree_loader_configs->pdata[i];
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const char *val;
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val = ostree_bootconfig_parser_get (config, "title");
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if (!val)
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val = "(Untitled)";
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if (regenerate_default && i == 0)
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{
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g_ptr_array_add (new_lines, g_strdup_printf ("DEFAULT %s", val));
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}
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g_ptr_array_add (new_lines, g_strdup_printf ("LABEL %s", val));
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val = ostree_bootconfig_parser_get (config, "linux");
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if (!val)
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{
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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"No \"linux\" key in bootloader config");
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goto out;
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}
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g_ptr_array_add (new_lines, g_strdup_printf ("\tKERNEL %s", val));
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val = ostree_bootconfig_parser_get (config, "initrd");
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if (val)
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g_ptr_array_add (new_lines, g_strdup_printf ("\tINITRD %s", val));
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val = ostree_bootconfig_parser_get (config, "options");
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if (val)
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g_ptr_array_add (new_lines, g_strdup_printf ("\tAPPEND %s", val));
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}
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ret = TRUE;
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out:
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return ret;
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}
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static gboolean
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ostree_bootloader_syslinux_write_config (OstreeBootloader *bootloader,
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int bootversion,
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GCancellable *cancellable,
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GError **error)
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{
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gboolean ret = FALSE;
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OstreeBootloaderSyslinux *self = OSTREE_BOOTLOADER_SYSLINUX (bootloader);
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gs_unref_object GFile *new_config_path = NULL;
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gs_free char *config_contents = NULL;
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gs_free char *new_config_contents = NULL;
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gs_unref_ptrarray GPtrArray *new_lines = NULL;
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gs_unref_ptrarray GPtrArray *tmp_lines = NULL;
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gs_free char *kernel_arg = NULL;
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gboolean saw_default = FALSE;
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gboolean regenerate_default = FALSE;
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gboolean parsing_label = FALSE;
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char **lines = NULL;
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char **iter;
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guint i;
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new_config_path = ot_gfile_resolve_path_printf (self->sysroot->path, "boot/loader.%d/syslinux.cfg",
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bootversion);
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/* This should follow the symbolic link to the current bootversion. */
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config_contents = gs_file_load_contents_utf8 (self->config_path, cancellable, error);
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if (!config_contents)
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goto out;
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lines = g_strsplit (config_contents, "\n", -1);
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new_lines = g_ptr_array_new_with_free_func (g_free);
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tmp_lines = g_ptr_array_new_with_free_func (g_free);
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/* Note special iteration condition here; we want to also loop one
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* more time at the end where line = NULL to ensure we finish off
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* processing the last LABEL.
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*/
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iter = lines;
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while (TRUE)
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{
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char *line = *iter;
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gboolean skip = FALSE;
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if (parsing_label &&
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(line == NULL || !g_str_has_prefix (line, "\t")))
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{
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parsing_label = FALSE;
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if (kernel_arg == NULL)
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{
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g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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"No KERNEL argument found after LABEL");
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goto out;
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}
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/* If this is a non-ostree kernel, just emit the lines
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* we saw.
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*/
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if (!g_str_has_prefix (kernel_arg, "/ostree/"))
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{
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for (i = 0; i < tmp_lines->len; i++)
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{
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g_ptr_array_add (new_lines, tmp_lines->pdata[i]);
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tmp_lines->pdata[i] = NULL; /* Transfer ownership */
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}
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}
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else
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{
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/* Otherwise, we drop the config on the floor - it
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* will be regenerated.
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*/
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g_ptr_array_set_size (tmp_lines, 0);
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}
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}
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if (line == NULL)
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break;
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if (!parsing_label &&
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(g_str_has_prefix (line, "LABEL ")))
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{
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parsing_label = TRUE;
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g_ptr_array_set_size (tmp_lines, 0);
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}
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else if (parsing_label && g_str_has_prefix (line, "\tKERNEL "))
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{
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g_free (kernel_arg);
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kernel_arg = g_strdup (line + strlen ("\tKERNEL "));
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}
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else if (!parsing_label &&
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(g_str_has_prefix (line, "DEFAULT ")))
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{
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saw_default = TRUE;
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if (g_str_has_prefix (line, "DEFAULT ostree:"))
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regenerate_default = TRUE;
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skip = TRUE;
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}
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if (skip)
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{
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g_free (line);
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}
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else
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{
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if (parsing_label)
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{
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g_ptr_array_add (tmp_lines, line);
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}
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else
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{
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g_ptr_array_add (new_lines, line);
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}
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}
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/* Transfer ownership */
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*iter = NULL;
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iter++;
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}
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if (!saw_default)
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regenerate_default = TRUE;
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if (!append_config_from_boostree_loader_entries (self, regenerate_default,
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bootversion, new_lines,
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cancellable, error))
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goto out;
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new_config_contents = _ostree_sysroot_join_lines (new_lines);
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if (strcmp (new_config_contents, config_contents) != 0)
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{
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if (!g_file_replace_contents (new_config_path, new_config_contents,
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strlen (new_config_contents),
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NULL, FALSE, G_FILE_CREATE_NONE,
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NULL, cancellable, error))
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goto out;
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g_print ("Saved new version of %s\n", gs_file_get_path_cached (self->config_path));
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}
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ret = TRUE;
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out:
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g_free (lines); /* Note we freed elements individually */
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return ret;
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}
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static void
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ostree_bootloader_syslinux_finalize (GObject *object)
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{
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OstreeBootloaderSyslinux *self = OSTREE_BOOTLOADER_SYSLINUX (object);
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g_clear_object (&self->sysroot);
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g_clear_object (&self->config_path);
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G_OBJECT_CLASS (ostree_bootloader_syslinux_parent_class)->finalize (object);
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}
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void
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ostree_bootloader_syslinux_init (OstreeBootloaderSyslinux *self)
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{
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}
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static void
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ostree_bootloader_syslinux_bootloader_iface_init (OstreeBootloaderInterface *iface)
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{
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iface->query = ostree_bootloader_syslinux_query;
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iface->get_name = ostree_bootloader_syslinux_get_name;
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iface->write_config = ostree_bootloader_syslinux_write_config;
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}
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void
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ostree_bootloader_syslinux_class_init (OstreeBootloaderSyslinuxClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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object_class->finalize = ostree_bootloader_syslinux_finalize;
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}
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OstreeBootloaderSyslinux *
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ostree_bootloader_syslinux_new (OstreeSysroot *sysroot)
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{
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OstreeBootloaderSyslinux *self = g_object_new (OSTREE_TYPE_BOOTLOADER_SYSLINUX, NULL);
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self->sysroot = g_object_ref (sysroot);
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self->config_path = g_file_resolve_relative_path (self->sysroot->path, "boot/syslinux/syslinux.cfg");
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return self;
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}
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