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151 lines
6.3 KiB
151 lines
6.3 KiB
From e47358d080fb705b4aa89f8506c4bf0e0fce6910 Mon Sep 17 00:00:00 2001
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From: Mike Yuan <me@yhndnzj.com>
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Date: Thu, 13 Jul 2023 22:44:19 +0800
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Subject: [PATCH] fstab-generator: resolve bind mount source when in initrd
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We currently prepend /sysroot to mount points for entries
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in /sysroot/etc/fstab. But when it comes to bind mounts,
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the source needs to canonicalized too.
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Fixes #6827
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Replaces #7894
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(cherry picked from commit b5fd3956ecaff8ef5f0b1826076965cab5fce604)
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Related: #2190226
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---
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src/fstab-generator/fstab-generator.c | 79 ++++++++++++++++++---------
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1 file changed, 53 insertions(+), 26 deletions(-)
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diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
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index 6756885478..4885d6d722 100644
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--- a/src/fstab-generator/fstab-generator.c
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+++ b/src/fstab-generator/fstab-generator.c
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@@ -793,6 +793,40 @@ static MountPointFlags fstab_options_to_flags(const char *options, bool is_swap)
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return flags;
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}
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+static int canonicalize_mount_path(const char *path, const char *type, bool initrd, char **ret) {
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+ _cleanup_free_ char *p = NULL;
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+ bool changed;
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+ int r;
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+
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+ assert(path);
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+ assert(type);
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+ assert(STR_IN_SET(type, "where", "what"));
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+ assert(ret);
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+
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+ // FIXME: when chase() learns to chase non-existent paths, use this here and drop the prefixing with
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+ // /sysroot on error below.
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+ r = chase_symlinks(path, initrd ? "/sysroot" : NULL, CHASE_PREFIX_ROOT | CHASE_NONEXISTENT, &p, NULL);
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+ if (r < 0) {
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+ log_debug_errno(r, "Failed to chase '%s', using as-is: %m", path);
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+
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+ if (initrd)
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+ p = path_join("/sysroot", path);
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+ else
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+ p = strdup(path);
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+ if (!p)
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+ return log_oom();
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+
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+ path_simplify(p);
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+ }
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+
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+ changed = !streq(path, p);
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+ if (changed)
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+ log_debug("Canonicalized %s=%s to %s", type, path, p);
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+
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+ *ret = TAKE_PTR(p);
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+ return changed;
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+}
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+
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static int parse_fstab_one(
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const char *source,
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const char *what_original,
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@@ -805,7 +839,7 @@ static int parse_fstab_one(
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_cleanup_free_ char *what = NULL, *where = NULL;
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MountPointFlags flags;
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- bool is_swap;
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+ bool is_swap, where_changed;
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int r;
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assert(what_original);
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@@ -840,7 +874,7 @@ static int parse_fstab_one(
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assert(where_original); /* 'where' is not necessary for swap entry. */
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if (!is_path(where_original)) {
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- log_warning("Mount point %s is not a valid path, ignoring.", where);
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+ log_warning("Mount point %s is not a valid path, ignoring.", where_original);
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return 0;
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}
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@@ -848,41 +882,34 @@ static int parse_fstab_one(
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* mount units, but causes problems since it historically worked to have symlinks in e.g.
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* /etc/fstab. So we canonicalize here. Note that we use CHASE_NONEXISTENT to handle the case
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* where a symlink refers to another mount target; this works assuming the sub-mountpoint
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- * target is the final directory.
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- *
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- * FIXME: when chase() learns to chase non-existent paths, use this here and
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- * drop the prefixing with /sysroot on error below.
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- */
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- r = chase_symlinks(where_original, initrd ? "/sysroot" : NULL, CHASE_PREFIX_ROOT | CHASE_NONEXISTENT, &where, NULL);
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- if (r < 0) {
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- /* If we can't canonicalize, continue as if it wasn't a symlink */
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- log_debug_errno(r, "Failed to read symlink target for %s, using as-is: %m", where_original);
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+ * target is the final directory. */
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+ r = canonicalize_mount_path(where_original, "where", initrd, &where);
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+ if (r < 0)
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+ return r;
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+ where_changed = r > 0;
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- if (initrd)
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- where = path_join("/sysroot", where_original);
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- else
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- where = strdup(where_original);
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- if (!where)
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- return log_oom();
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+ if (initrd && fstab_is_bind(options, fstype)) {
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+ /* When in initrd, the source of bind mount needs to be prepended with /sysroot as well. */
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+ _cleanup_free_ char *p = NULL;
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+
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+ r = canonicalize_mount_path(what, "what", initrd, &p);
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+ if (r < 0)
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+ return r;
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- path_simplify(where);
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+ free_and_replace(what, p);
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}
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- if (streq(where, where_original)) /* If it was fully canonicalized, suppress the change */
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- where = mfree(where);
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- else
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- log_debug("Canonicalized what=%s where=%s to %s", what, where_original, where);
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log_debug("Found entry what=%s where=%s type=%s makefs=%s growfs=%s noauto=%s nofail=%s",
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what, where, strna(fstype),
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yes_no(flags & MOUNT_MAKEFS), yes_no(flags & MOUNT_GROWFS),
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yes_no(flags & MOUNT_NOAUTO), yes_no(flags & MOUNT_NOFAIL));
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- bool is_sysroot = in_initrd() && path_equal(where ?: where_original, "/sysroot");
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+ bool is_sysroot = in_initrd() && path_equal(where, "/sysroot");
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/* See comment from add_sysroot_usr_mount() about the need for extra indirection in case /usr needs
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* to be mounted in order for the root fs to be synthesized based on configuration included in /usr/,
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* e.g. systemd-repart. */
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- bool is_sysroot_usr = in_initrd() && path_equal(where ?: where_original, "/sysroot/usr");
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+ bool is_sysroot_usr = in_initrd() && path_equal(where, "/sysroot/usr");
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const char *target_unit =
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initrd ? SPECIAL_INITRD_FS_TARGET :
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@@ -894,8 +921,8 @@ static int parse_fstab_one(
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r = add_mount(source,
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arg_dest,
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what,
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- is_sysroot_usr ? "/sysusr/usr" : where ?: where_original,
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- !is_sysroot_usr && where ? where_original : NULL,
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+ is_sysroot_usr ? "/sysusr/usr" : where,
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+ !is_sysroot_usr && where_changed ? where_original : NULL,
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fstype,
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options,
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passno,
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