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core: gracefully skip unknown policy designators in RootImagePolicy et al (#40060)

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Usually we gracefully ignore unknown configuration parameters, so that
service files can be written by upstreams and used across a variegated
range of distributions with various versions of systemd, to avoid
forcing users to the minimum common denominator and only adding settings
that are supported by the oldest distro supported.

Image policies do not behave like this, and any unknown partition or
policy designator causes the whole unit to fail to parse and a hard
error.

Change it so that parsing RootImagePolicy and friends via unit file or
D-Bus logs but otherwise ignores unknown specifiers, like other options
do.

This allows us to add new specifiers in the future, and users to adopt
them immediately.

Follow-up for d452335aa4
This commit is contained in:
Luca Boccassi
2025-12-11 14:38:26 +09:00
committed by GitHub
parent 72711b76e0
commit 7c0afcdde2
9 changed files with 62 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/shared/image-policy.c
+18 -8
View File
@@ -209,7 +209,7 @@ static PartitionPolicyFlags policy_flag_from_string_one(const char *s) {
return _PARTITION_POLICY_FLAGS_INVALID;
}
PartitionPolicyFlags partition_policy_flags_from_string(const char *s) {
PartitionPolicyFlags partition_policy_flags_from_string(const char *s, bool graceful) {
PartitionPolicyFlags flags = 0;
int r;
@@ -229,8 +229,13 @@ PartitionPolicyFlags partition_policy_flags_from_string(const char *s) {
break;
ff = policy_flag_from_string_one(strstrip(f));
if (ff < 0)
if (ff < 0) {
if (graceful) {
log_debug("Unknown partition policy flag: %s, ignoring", f);
continue;
}
return -EBADRQC; /* recognizable error */
}
flags |= ff;
}
@@ -254,7 +259,7 @@ static ImagePolicy* image_policy_new(size_t n_policies) {
return p;
}
int image_policy_from_string(const char *s, ImagePolicy **ret) {
int image_policy_from_string(const char *s, bool graceful, ImagePolicy **ret) {
_cleanup_free_ ImagePolicy *p = NULL;
uint64_t dmask = 0;
ImagePolicy *t;
@@ -336,15 +341,20 @@ int image_policy_from_string(const char *s, ImagePolicy **ret) {
default_specified = true;
} else {
designator = partition_designator_from_string(ds);
if (designator < 0)
return log_debug_errno(SYNTHETIC_ERRNO(EBADSLT), "Unknown partition designator: %s", ds); /* recognizable error */
if (designator < 0) {
if (!graceful)
return log_debug_errno(SYNTHETIC_ERRNO(EBADSLT), "Unknown partition designator: %s", ds); /* recognizable error */
log_debug("Unknown partition designator: %s, ignoring", ds);
continue;
}
if (dmask & (UINT64_C(1) << designator))
return log_debug_errno(SYNTHETIC_ERRNO(ENOTUNIQ), "Partition designator specified more than once: %s", ds);
dmask |= UINT64_C(1) << designator;
}
fs = strstrip(f);
flags = partition_policy_flags_from_string(fs);
flags = partition_policy_flags_from_string(fs, graceful);
if (flags == -EBADRQC)
return log_debug_errno(flags, "Unknown partition policy flag: %s", fs);
if (flags < 0)
@@ -651,7 +661,7 @@ int config_parse_image_policy(
return 0;
}
r = image_policy_from_string(rvalue, &np);
r = image_policy_from_string(rvalue, /* graceful */ true, &np);
if (r == -ENOTUNIQ)
return log_syntax(unit, LOG_ERR, filename, line, r, "Duplicate rule in image policy, refusing: %s", rvalue);
if (r == -EBADSLT)
@@ -678,7 +688,7 @@ int parse_image_policy_argument(const char *s, ImagePolicy **policy) {
* Hence, do not pass in uninitialized pointers.
*/
r = image_policy_from_string(s, &np);
r = image_policy_from_string(s, /* graceful= */ false, &np);
if (r == -ENOTUNIQ)
return log_error_errno(r, "Duplicate rule in image policy: %s", s);
if (r == -EBADSLT)
src/shared/image-policy.h
+2 -2
View File
@@ -80,10 +80,10 @@ static inline size_t image_policy_n_entries(const ImagePolicy *policy) {
PartitionPolicyFlags partition_policy_flags_extend(PartitionPolicyFlags flags);
PartitionPolicyFlags partition_policy_flags_reduce(PartitionPolicyFlags flags);
PartitionPolicyFlags partition_policy_flags_from_string(const char *s);
PartitionPolicyFlags partition_policy_flags_from_string(const char *s, bool graceful);
int partition_policy_flags_to_string(PartitionPolicyFlags flags, bool simplify, char **ret);
int image_policy_from_string(const char *s, ImagePolicy **ret);
int image_policy_from_string(const char *s, bool graceful, ImagePolicy **ret);
int image_policy_to_string(const ImagePolicy *policy, bool simplify, char **ret);
/* Recognizes three special policies by equivalence */