journalctl: rework code that checks whether we have access to /var/log/journal

- fix some memory leaks on error conditions

- handle all error cases properly, and log about failures

- move HAVE_ACL and no-HAVE_ACL code closer to each other

src/shared/acl-util.c

@@ -81,17 +81,18 @@ int calc_acl_mask_if_needed(acl_t *acl_p) {
 
                 if (tag == ACL_MASK)
                         return 0;
-                if (IN_SET(tag, ACL_USER, ACL_GROUP))
-                        goto calc;
+
+                if (IN_SET(tag, ACL_USER, ACL_GROUP)) {
+                        if (acl_calc_mask(acl_p) < 0)
+                                return -errno;
+
+                        return 1;
+                }
         }
         if (r < 0)
                 return -errno;
-        return 0;
 
-calc:
-        if (acl_calc_mask(acl_p) < 0)
-                return -errno;
-        return 1;
+        return 0;
 }
 
 int add_base_acls_if_needed(acl_t *acl_p, const char *path) {
@@ -158,59 +159,68 @@ int add_base_acls_if_needed(acl_t *acl_p, const char *path) {
         return 0;
 }
 
-int search_acl_groups(char*** dst, const char* path, bool* belong) {
-        acl_t acl;
+int acl_search_groups(const char *path, char ***ret_groups) {
+        _cleanup_strv_free_ char **g = NULL;
+        _cleanup_(acl_free) acl_t acl = NULL;
+        bool ret = false;
+        acl_entry_t entry;
+        int r;
 
         assert(path);
-        assert(belong);
 
         acl = acl_get_file(path, ACL_TYPE_DEFAULT);
-        if (acl) {
-                acl_entry_t entry;
-                int r;
+        if (!acl)
+                return -errno;
 
-                r = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
-                while (r > 0) {
-                        acl_tag_t tag;
-                        gid_t *gid;
-                        char *name;
+        r = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
+        for (;;) {
+                _cleanup_(acl_free_gid_tpp) gid_t *gid = NULL;
+                acl_tag_t tag;
 
-                        r = acl_get_tag_type(entry, &tag);
-                        if (r < 0)
-                                break;
+                if (r < 0)
+                        return -errno;
+                if (r == 0)
+                        break;
 
-                        if (tag != ACL_GROUP)
-                                goto next;
+                if (acl_get_tag_type(entry, &tag) < 0)
+                        return -errno;
 
-                        gid = acl_get_qualifier(entry);
-                        if (!gid)
-                                break;
+                if (tag != ACL_GROUP)
+                        goto next;
 
-                        if (in_gid(*gid) > 0) {
-                                *belong = true;
-                                break;
-                        }
+                gid = acl_get_qualifier(entry);
+                if (!gid)
+                        return -errno;
 
-                        name = gid_to_name(*gid);
-                        if (!name) {
-                                acl_free(acl);
-                                return log_oom();
-                        }
+                if (in_gid(*gid) > 0) {
+                        if (!ret_groups)
+                                return true;
 
-                        r = strv_consume(dst, name);
-                        if (r < 0) {
-                                acl_free(acl);
-                                return log_oom();
-                        }
-
-                next:
-                        r = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry);
+                        ret = true;
                 }
 
-                acl_free(acl);
+                if (ret_groups) {
+                        char *name;
+
+                        name = gid_to_name(*gid);
+                        if (!name)
+                                return -ENOMEM;
+
+                        r = strv_consume(&g, name);
+                        if (r < 0)
+                                return r;
+                }
+
+        next:
+                r = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry);
         }
 
-        return 0;
+        if (ret_groups) {
+                *ret_groups = g;
+                g = NULL;
+        }
+
+        return ret;
 }
 
 int parse_acl(char *text, acl_t *acl_access, acl_t *acl_default, bool want_mask) {

src/shared/acl-util.h

@@ -32,7 +32,7 @@
 int acl_find_uid(acl_t acl, uid_t uid, acl_entry_t *entry);
 int calc_acl_mask_if_needed(acl_t *acl_p);
 int add_base_acls_if_needed(acl_t *acl_p, const char *path);
-int search_acl_groups(char*** dst, const char* path, bool* belong);
+int acl_search_groups(const char* path, char ***ret_groups);
 int parse_acl(char *text, acl_t *acl_access, acl_t *acl_default, bool want_mask);
 int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl);