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sysroot: Ensure deployment detection works when using composefs

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In the case of composefs, we cannot compare the devino of the rootfs
and the deploy dir, because the root is the composefs mount, not a
bind mount. Instead we check the devino of the etc subdir of the
deploy, because this is a bind mount even when using composefs.
This commit is contained in:
Alexander Larsson 2023-05-16 10:17:32 +02:00
parent 11d7587e40
commit d47a90347b
2 changed files with 27 additions and 2 deletions
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4
src/libostree/ostree-sysroot-private.h
View File

@ -70,9 +70,11 @@ struct OstreeSysroot
OstreeSysrootLoadState loadstate;
gboolean mount_namespace_in_use; /* TRUE if caller has told us they used CLONE_NEWNS */
gboolean root_is_ostree_booted; /* TRUE if sysroot is / and we are booted via ostree */
/* The device/inode for /, used to detect booted deployment */
/* The device/inode for / and /etc, used to detect booted deployment */
dev_t root_device;
ino_t root_inode;
dev_t etc_device;
ino_t etc_inode;
gboolean is_physical; /* TRUE if we're pointed at physical storage root and not a deployment */
GPtrArray *deployments;

25
src/libostree/ostree-sysroot.c
View File

@ -799,14 +799,26 @@ parse_deployment (OstreeSysroot *self, const char *boot_link, OstreeDeployment *
if (looking_for_booted_deployment)
{
struct stat stbuf;
struct stat etc_stbuf = {};
if (!glnx_fstat (deployment_dfd, &stbuf, error))
return FALSE;
/* We look for either the root or the etc subdir of the
* deployment. We need to do this, because when using composefs,
* the root is not a bind mount of the deploy dir, but the etc
* dir is.
*/
if (!glnx_fstatat_allow_noent (deployment_dfd, "etc", &etc_stbuf, 0, error))
return FALSE;
/* A bit ugly, we're assigning to a sysroot-owned variable from deep in
* this parsing code. But eh, if something fails the sysroot state can't
* be relied on anyways.
*/
is_booted_deployment
= (stbuf.st_dev == self->root_device && stbuf.st_ino == self->root_inode);
= (stbuf.st_dev == self->root_device && stbuf.st_ino == self->root_inode)
|| (etc_stbuf.st_dev == self->etc_device && etc_stbuf.st_ino == self->etc_inode);
}
g_autoptr (OstreeDeployment) ret_deployment
@ -1003,6 +1015,17 @@ ostree_sysroot_initialize (OstreeSysroot *self, GError **error)
self->root_inode = root_stbuf.st_ino;
}
{
struct stat etc_stbuf;
if (!glnx_fstatat_allow_noent (AT_FDCWD, "/etc", &etc_stbuf, 0, error))
return FALSE;
if (errno != ENOENT)
{
self->etc_device = etc_stbuf.st_dev;
self->etc_inode = etc_stbuf.st_ino;
}
}
struct stat self_stbuf;
if (!glnx_fstatat (AT_FDCWD, gs_file_get_path_cached (self->path), &self_stbuf, 0, error))
return FALSE;