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core: suppress various defaults deps for credentials mounts

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The per-unit credentials mounts might show up for any kind of service,
including very very early ones. Hence let's not order them after
local-fs-pre.target, because otherwise we might trigger cyclic deps of
services that want to plug before that but still use credentials.
This commit is contained in:
Lennart Poettering 2023-03-23 13:59:45 +01:00
parent ce18c39623
commit 92e64e9ae9
1 changed files with 38 additions and 13 deletions
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51
src/core/mount.c
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@ -473,6 +473,22 @@ static bool mount_is_extrinsic(Unit *u) {
return false;
}
static bool mount_is_credentials(Mount *m) {
const char *e;
assert(m);
/* Returns true if this is a credentials mount. We don't want automatic dependencies on credential
* mounts, since they are managed by us for even the earliest services, and we never want anything to
* be ordered before them hence. */
e = path_startswith(m->where, UNIT(m)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
if (!e)
return false;
return !isempty(path_startswith(e, "credentials"));
}
static int mount_add_default_ordering_dependencies(Mount *m, MountParameters *p, UnitDependencyMask mask) {
const char *after, *before, *e;
int r;
@ -495,7 +511,10 @@ static int mount_add_default_ordering_dependencies(Mount *m, MountParameters *p,
after = SPECIAL_LOCAL_FS_PRE_TARGET;
before = SPECIAL_INITRD_USR_FS_TARGET;
} else if (mount_is_network(p)) {
} else if (mount_is_credentials(m))
after = before = NULL;
else if (mount_is_network(p)) {
after = SPECIAL_REMOTE_FS_PRE_TARGET;
before = SPECIAL_REMOTE_FS_TARGET;
@ -504,18 +523,32 @@ static int mount_add_default_ordering_dependencies(Mount *m, MountParameters *p,
before = SPECIAL_LOCAL_FS_TARGET;
}
if (!mount_is_nofail(m)) {
if (before && !mount_is_nofail(m)) {
r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, before, /* add_reference= */ true, mask);
if (r < 0)
return r;
}
r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, /* add_reference= */ true, mask);
if (after) {
r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, /* add_reference= */ true, mask);
if (r < 0)
return r;
}
r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET,
/* add_reference= */ true, mask);
if (r < 0)
return r;
return unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET,
/* add_reference= */ true, mask);
/* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
if (streq_ptr(p->fstype, "tmpfs") && !mount_is_credentials(m)) {
r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET,
/* add_reference= */ true, mask);
if (r < 0)
return r;
}
return 0;
}
static int mount_add_default_dependencies(Mount *m) {
@ -567,14 +600,6 @@ static int mount_add_default_dependencies(Mount *m) {
return r;
}
/* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
if (streq_ptr(p->fstype, "tmpfs")) {
r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET,
/* add_reference= */ true, mask);
if (r < 0)
return r;
}
return exec_context_add_default_dependencies(UNIT(m), &m->exec_context);
}