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fstab-generator: add a flag to accept entry for "/" in initrd

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When both prefix_sysroot and accept_root is true, the entry for "/" will
be accepted and converted to "/sysroot/".

Why? If the entry is read from the main system's fstab, then we already
mounted /sysroot/, hence it is not and should not re-add the .mount unit
for /sysroot/. However, if we want to specify the root mount through the
kernel command line or credential, without this change, we need to
specify the same entry in the two options. E.g.
===
systemd.mount-extra=/dev/sda1:/:auto:defaults
rd.systemd.mount-extra=/dev/sda1:/sysroot:auto:defaults
===
That's inconvenient. Of course, we can dedup that by using traditional
options, but cannot when defined in credential.
This commit is contained in:
Yu Watanabe 2023-07-26 09:39:23 +09:00
parent dfd10549ac
commit 22f5a825e4
1 changed files with 9 additions and 4 deletions
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13
src/fstab-generator/fstab-generator.c
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@ -314,9 +314,9 @@ static bool mount_is_network(const char *fstype, const char *options) {
(fstype && fstype_is_network(fstype));
}
static bool mount_in_initrd(const char *where, const char *options) {
static bool mount_in_initrd(const char *where, const char *options, bool accept_root) {
return fstab_test_option(options, "x-initrd.mount\0") ||
(where && path_equal(where, "/usr"));
(where && PATH_IN_SET(where, "/usr", accept_root ? "/" : NULL));
}
static int write_timeout(
@ -851,6 +851,7 @@ static int parse_fstab_one(
const char *options,
int passno,
bool prefix_sysroot,
bool accept_root, /* This takes an effect only when prefix_sysroot is true. */
bool use_swap_enabled) {
_cleanup_free_ char *what = NULL, *where = NULL;
@ -862,7 +863,7 @@ static int parse_fstab_one(
assert(fstype);
assert(options);
if (prefix_sysroot && !mount_in_initrd(where_original, options))
if (prefix_sysroot && !mount_in_initrd(where_original, options, accept_root))
return 0;
is_swap = streq_ptr(fstype, "swap");
@ -982,7 +983,9 @@ static int parse_fstab(bool prefix_sysroot) {
while ((me = getmntent(f))) {
r = parse_fstab_one(fstab,
me->mnt_fsname, me->mnt_dir, me->mnt_type, me->mnt_opts, me->mnt_passno,
prefix_sysroot, /* use_swap_enabled = */ true);
prefix_sysroot,
/* accept_root = */ false,
/* use_swap_enabled = */ true);
if (r < 0 && ret >= 0)
ret = r;
if (arg_sysroot_check && r > 0)
@ -1301,6 +1304,7 @@ static int add_mounts_from_cmdline(void) {
m->options,
/* passno = */ 0,
/* prefix_sysroot = */ !m->for_initrd && in_initrd(),
/* accept_root = */ true,
/* use_swap_enabled = */ false);
if (r < 0 && ret >= 0)
ret = r;
@ -1337,6 +1341,7 @@ static int add_mounts_from_creds(bool prefix_sysroot) {
me->mnt_opts,
me->mnt_passno,
/* prefix_sysroot = */ prefix_sysroot,
/* accept_root = */ true,
/* use_swap_enabled = */ true);
if (r < 0 && ret >= 0)
ret = r;