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dissect: when mounting an image mount the XBOOTLDR partition to /boot

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Previously, we'd mount the ESP to /efi if that existed and was empty,
falling back to /boot if that existed and was empty.

With this change, the XBOOTLDR partition is mounted to /boot
unconditionally. And the EFI is mounted to /efi if that exists (but it
doesn't have to be empty — after all the name is very indicative of what
this is supposed to be), and to /boot as a fallback but only if it
exists and is empty (we insist on emptiness for that, since it might be
used differently than what we assume).

The net effect is that $BOOT should be reliably found under /boot, and
the ESP is either /efi or /boot.

(Note that this commit only is relevant for nspawn and suchlike, i.e.
the codepaths that mount an image without involving udev during boot.)
This commit is contained in:
Lennart Poettering 2019-01-23 11:53:28 +01:00
parent a8c47660bb
commit d9223c07f5
1 changed files with 21 additions and 12 deletions
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33
src/shared/dissect-image.c
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@ -857,11 +857,15 @@ static int mount_partition(
return -ENOMEM;
}
return mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
r = mount_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options);
if (r < 0)
return r;
return 1;
}
int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) {
int r;
int r, boot_mounted;
assert(m);
assert(where);
@ -894,21 +898,26 @@ int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift,
if (r < 0)
return r;
boot_mounted = mount_partition(m->partitions + PARTITION_XBOOTLDR, where, "/boot", uid_shift, flags);
if (boot_mounted < 0)
return boot_mounted;
if (m->partitions[PARTITION_ESP].found) {
const char *mp;
/* Mount the ESP to /efi if it exists. If it doesn't exist, use /boot instead, but only if it
* exists and is empty, and we didn't already mount the XBOOTLDR partition into it. */
/* Mount the ESP to /efi if it exists and is empty. If it doesn't exist, use /boot instead. */
r = chase_symlinks("/efi", where, CHASE_PREFIX_ROOT, NULL);
if (r >= 0) {
r = mount_partition(m->partitions + PARTITION_ESP, where, "/efi", uid_shift, flags);
if (r < 0)
return r;
FOREACH_STRING(mp, "/efi", "/boot") {
} else if (boot_mounted <= 0) {
_cleanup_free_ char *p = NULL;
r = chase_symlinks(mp, where, CHASE_PREFIX_ROOT, &p);
if (r < 0)
continue;
r = dir_is_empty(p);
if (r > 0) {
r = mount_partition(m->partitions + PARTITION_ESP, where, mp, uid_shift, flags);
r = chase_symlinks("/boot", where, CHASE_PREFIX_ROOT, &p);
if (r >= 0 && dir_is_empty(p) > 0) {
r = mount_partition(m->partitions + PARTITION_ESP, where, "/boot", uid_shift, flags);
if (r < 0)
return r;
}