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udev: define a generic helper to print messages about unknown users and groups

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We cannot just use %m, because strerror returns a confusing error message
for ESRCH or ENOEXEC. udev code was doing a good job, but the error handling
was very verbose. Let's encapsulate the customized error messages in a
helper.

No functional change, except that the error messages have a slightly different
form now. The old messages were a bit better, but we don't have as much
flexibility in the new scheme. "Failed to resolve user 'foo': Unknown user"
should be good enough.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2025-11-18 09:47:51 +01:00
parent 00ed239a7b
commit 6e6e96f628
3 changed files with 30 additions and 31 deletions
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9
src/basic/user-util.h
View File

@@ -10,7 +10,8 @@
#include "basic-forward.h"
/* Users managed by systemd-homed. See https://systemd.io/UIDS-GIDS for details how this range fits into the rest of the world */
/* Users managed by systemd-homed. See https://systemd.io/UIDS-GIDS for details
* how this range fits into the rest of the world. */
#define HOME_UID_MIN ((uid_t) 60001)
#define HOME_UID_MAX ((uid_t) 60513)
@@ -18,6 +19,12 @@
#define MAP_UID_MIN ((uid_t) 60514)
#define MAP_UID_MAX ((uid_t) 60577)
/* A helper to print an error message when user or group resolution fails.
* Note that we can't use ({ … }) to define a temporary variable, so errnum is
* evaluated multiple times. */
#define STRERROR_USER(errnum) ((errnum) == -ESRCH ? "Unknown user" : (errnum) == -ENOEXEC ? "Not a system user" : STRERROR(errnum))
#define STRERROR_GROUP(errnum) ((errnum) == -ESRCH ? "Unknown group" : (errnum) == -ENOEXEC ? "Not a system group" : STRERROR(errnum))
bool uid_is_valid(uid_t uid) _const_;
static inline bool gid_is_valid(gid_t gid) {

36
src/udev/udev-rules.c
View File

@@ -512,12 +512,10 @@ static int rule_resolve_user(UdevRuleLine *rule_line, const char *name, uid_t *r
r = userdb_by_name(name, &USERDB_MATCH_ROOT_AND_SYSTEM,
USERDB_SUPPRESS_SHADOW | USERDB_PARSE_NUMERIC | USERDB_SYNTHESIZE_NUMERIC,
&ur);
if (r == -ESRCH)
return log_line_error_errno(rule_line, r, "Unknown user '%s', ignoring.", name);
if (r == -ENOEXEC)
return log_line_error_errno(rule_line, r, "User '%s' is not a system user, ignoring.", name);
if (r < 0)
return log_line_error_errno(rule_line, r, "Failed to resolve user '%s', ignoring: %m", name);
return log_line_error_errno(rule_line, r,
"Failed to resolve user '%s', ignoring: %s",
name, STRERROR_USER(r));
_cleanup_free_ char *n = strdup(name);
if (!n)
@@ -549,12 +547,10 @@ static int rule_resolve_group(UdevRuleLine *rule_line, const char *name, gid_t *
r = groupdb_by_name(name, &USERDB_MATCH_ROOT_AND_SYSTEM,
USERDB_SUPPRESS_SHADOW | USERDB_PARSE_NUMERIC | USERDB_SYNTHESIZE_NUMERIC,
&gr);
if (r == -ESRCH)
return log_line_error_errno(rule_line, r, "Unknown group '%s', ignoring.", name);
if (r == -ENOEXEC)
return log_line_error_errno(rule_line, r, "Group '%s' is not a system group, ignoring.", name);
if (r < 0)
return log_line_error_errno(rule_line, r, "Failed to resolve group '%s', ignoring: %m", name);
return log_line_error_errno(rule_line, r,
"Failed to resolve group '%s', ignoring: %s",
name, STRERROR_GROUP(r));
_cleanup_free_ char *n = strdup(name);
if (!n)
@@ -2681,12 +2677,10 @@ static int udev_rule_apply_token_to_event(
r = userdb_by_name(owner, &USERDB_MATCH_ROOT_AND_SYSTEM,
USERDB_SUPPRESS_SHADOW | USERDB_PARSE_NUMERIC | USERDB_SYNTHESIZE_NUMERIC,
&ur);
if (r == -ESRCH)
log_event_error_errno(event, token, r, "Unknown user \"%s\", ignoring.", owner);
else if (r == -ENOEXEC)
log_event_error(event, token, "User \"%s\" is not a system user, ignoring.", owner);
else if (r < 0)
log_event_error_errno(event, token, r, "Failed to resolve user \"%s\", ignoring: %m", owner);
if (r < 0)
log_event_error_errno(event, token, r,
"Failed to resolve user \"%s\", ignoring: %s",
owner, STRERROR_USER(r));
else {
event->uid = ur->uid;
log_event_debug(event, token, "Set owner: %s("UID_FMT")", owner, event->uid);
@@ -2709,12 +2703,10 @@ static int udev_rule_apply_token_to_event(
r = groupdb_by_name(group, &USERDB_MATCH_ROOT_AND_SYSTEM,
USERDB_SUPPRESS_SHADOW | USERDB_PARSE_NUMERIC | USERDB_SYNTHESIZE_NUMERIC,
&gr);
if (r == -ESRCH)
log_event_error_errno(event, token, r, "Unknown group \"%s\", ignoring.", group);
else if (r == -ENOEXEC)
log_event_error(event, token, "Group \"%s\" is not a system group, ignoring.", group);
else if (r < 0)
log_event_error_errno(event, token, r, "Failed to resolve group \"%s\", ignoring: %m", group);
if (r < 0)
log_event_error_errno(event, token, r,
"Failed to resolve group \"%s\", ignoring: %s",
group, STRERROR_GROUP(r));
else {
event->gid = gr->gid;
log_event_debug(event, token, "Set group: %s("GID_FMT")", group, event->gid);

16
test/units/TEST-17-UDEV.verify.sh
View File

@@ -309,15 +309,15 @@ assert_0 "${rules}"
test_syntax_error 'OWNER=":nosuchuser:"' "Failed to resolve user ':nosuchuser:', ignoring: Invalid argument"
# nonexistent user
if ! getent passwd nosuchuser >/dev/null; then
test_syntax_error 'OWNER="nosuchuser"' "Unknown user 'nosuchuser', ignoring."
test_syntax_error 'OWNER="nosuchuser"' "Failed to resolve user 'nosuchuser', ignoring: Unknown user"
fi
if ! getent passwd 12345 >/dev/null; then
test_syntax_error 'OWNER="12345"' "Unknown user '12345', ignoring."
test_syntax_error 'OWNER="12345"' "Failed to resolve user '12345', ignoring: Unknown user"
fi
# regular user
if getent passwd testuser >/dev/null; then
test_syntax_error 'OWNER="testuser"' "User 'testuser' is not a system user, ignoring."
test_syntax_error "OWNER=\"$(id -u testuser)\"" "User '$(id -u testuser)' is not a system user, ignoring."
test_syntax_error 'OWNER="testuser"' "Failed to resolve user 'testuser', ignoring: Not a system user"
test_syntax_error "OWNER=\"$(id -u testuser)\"" "Failed to resolve user '$(id -u testuser)', ignoring: Not a system user"
fi
test_syntax_error 'GROUP{a}="b"' 'Invalid attribute for GROUP.'
test_syntax_error 'GROUP-="b"' 'Invalid operator for GROUP.'
@@ -341,15 +341,15 @@ assert_0 "${rules}"
test_syntax_error 'GROUP=":nosuchgroup:"' "Failed to resolve group ':nosuchgroup:', ignoring: Invalid argument"
# nonexistent group
if ! getent group nosuchgroup >/dev/null; then
test_syntax_error 'GROUP="nosuchgroup"' "Unknown group 'nosuchgroup', ignoring."
test_syntax_error 'GROUP="nosuchgroup"' "Failed to resolve group 'nosuchgroup', ignoring: Unknown group"
fi
if ! getent group 12345 >/dev/null; then
test_syntax_error 'GROUP="12345"' "Unknown group '12345', ignoring."
test_syntax_error 'GROUP="12345"' "Failed to resolve group '12345', ignoring: Unknown group"
fi
# regular group
if getent group testuser >/dev/null; then
test_syntax_error 'GROUP="testuser"' "Group 'testuser' is not a system group, ignoring."
test_syntax_error "GROUP=\"$(id -g testuser)\"" "Group '$(id -g testuser)' is not a system group, ignoring."
test_syntax_error 'GROUP="testuser"' "Failed to resolve group 'testuser', ignoring: Not a system group"
test_syntax_error "GROUP=\"$(id -g testuser)\"" "Failed to resolve group '$(id -g testuser)', ignoring: Not a system group"
fi
test_syntax_error 'MODE{a}="b"' 'Invalid attribute for MODE.'
test_syntax_error 'MODE-="b"' 'Invalid operator for MODE.'