journald: let's simplify rotating of offline user journals

Let's just use the path that is already stored in JournalStorage,
instead of generating our own. While we are at it, split out the loop
into its own function.

1 files changed, 96 insertions, 104 deletions

diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
index 00dd77c14b..8ec42d6dcb 100644
--- a/src/journal/journald-server.c
+++ b/src/journal/journald-server.c
@@ -491,36 +491,110 @@ static void server_vacuum_deferred_closes(Server *s) {
         }
 }
 
-static int open_user_journal_directory(Server *s, DIR **ret_dir, char **ret_path) {
-        _cleanup_closedir_ DIR *dir = NULL;
-        _cleanup_free_ char *path = NULL;
-        sd_id128_t machine;
+static int vacuum_offline_user_journals(Server *s) {
+        _cleanup_closedir_ DIR *d = NULL;
         int r;
 
         assert(s);
 
-        r = sd_id128_get_machine(&machine);
-        if (r < 0)
-                return log_error_errno(r, "Failed to determine machine ID, ignoring: %m");
+        d = opendir(s->system_storage.path);
+        if (!d) {
+                if (errno == ENOENT)
+                        return 0;
 
-        if (asprintf(&path, "/var/log/journal/" SD_ID128_FORMAT_STR "/", SD_ID128_FORMAT_VAL(machine)) < 0)
-                return log_oom();
+                return log_error_errno(errno, "Failed to open %s: %m", s->system_storage.path);
+        }
+
+        for (;;) {
+                _cleanup_free_ char *u = NULL, *full = NULL;
+                _cleanup_close_ int fd = -1;
+                const char *a, *b;
+                struct dirent *de;
+                JournalFile *f;
+                uid_t uid;
+
+                errno = 0;
+                de = readdir_no_dot(d);
+                if (!de) {
+                        if (errno != 0)
+                                log_warning_errno(errno, "Failed to enumerate %s, ignoring: %m", s->system_storage.path);
+
+                        break;
+                }
+
+                a = startswith(de->d_name, "user-");
+                if (!a)
+                        continue;
+                b = endswith(de->d_name, ".journal");
+                if (!b)
+                        continue;
+
+                u = strndup(a, b-a);
+                if (!u)
+                        return log_oom();
+
+                r = parse_uid(u, &uid);
+                if (r < 0) {
+                        log_debug_errno(r, "Failed to parse UID from file name '%s', ignoring: %m", de->d_name);
+                        continue;
+                }
+
+                /* Already rotated in the above loop? i.e. is it an open user journal? */
+                if (ordered_hashmap_contains(s->user_journals, UID_TO_PTR(uid)))
+                        continue;
+
+                full = path_join(s->system_storage.path, de->d_name);
+                if (!full)
+                        return log_oom();
+
+                fd = openat(dirfd(d), de->d_name, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW|O_NONBLOCK);
+                if (fd < 0) {
+                        log_full_errno(IN_SET(errno, ELOOP, ENOENT) ? LOG_DEBUG : LOG_WARNING, errno,
+                                       "Failed to open journal file '%s' for rotation: %m", full);
+                        continue;
+                }
+
+                /* Make some room in the set of deferred close()s */
+                server_vacuum_deferred_closes(s);
+
+                /* Open the file briefly, so that we can archive it */
+                r = journal_file_open(fd,
+                                      full,
+                                      O_RDWR,
+                                      0640,
+                                      s->compress.enabled,
+                                      s->compress.threshold_bytes,
+                                      s->seal,
+                                      &s->system_storage.metrics,
+                                      s->mmap,
+                                      s->deferred_closes,
+                                      NULL,
+                                      &f);
+                if (r < 0) {
+                        log_warning_errno(r, "Failed to read journal file %s for rotation, trying to move it out of the way: %m", full);
+
+                        r = journal_file_dispose(dirfd(d), de->d_name);
+                        if (r < 0)
+                                log_warning_errno(r, "Failed to move %s out of the way, ignoring: %m", full);
+                        else
+                                log_debug("Successfully moved %s out of the way.", full);
+
+                        continue;
+                }
 
-        dir = opendir(path);
-        if (!dir)
-                return log_error_errno(errno, "Failed to open user journal directory '%s': %m", path);
+                TAKE_FD(fd); /* Donated to journal_file_open() */
+
+                r = journal_file_archive(f);
+                if (r < 0)
+                        log_debug_errno(r, "Failed to archive journal file '%s', ignoring: %m", full);
 
-        if (ret_dir)
-                *ret_dir = TAKE_PTR(dir);
-        if (ret_path)
-                *ret_path = TAKE_PTR(path);
+                f = journal_initiate_close(f, s->deferred_closes);
+        }
 
         return 0;
 }
 
 void server_rotate(Server *s) {
-        _cleanup_free_ char *path = NULL;
-        _cleanup_closedir_ DIR *d = NULL;
         JournalFile *f;
         Iterator i;
         void *k;
@@ -542,92 +616,10 @@ void server_rotate(Server *s) {
                         ordered_hashmap_remove(s->user_journals, k);
         }
 
-        /* Finally, also rotate all user journals we currently do not have open. (But do so only if we actually have
-         * access to /var, i.e. are not in the log-to-runtime-journal mode). */
-        if (!s->runtime_journal &&
-            open_user_journal_directory(s, &d, &path) >= 0) {
-
-                struct dirent *de;
-
-                FOREACH_DIRENT(de, d, log_warning_errno(errno, "Failed to enumerate %s, ignoring: %m", path)) {
-                        _cleanup_free_ char *u = NULL, *full = NULL;
-                        _cleanup_close_ int fd = -1;
-                        const char *a, *b;
-                        uid_t uid;
-
-                        a = startswith(de->d_name, "user-");
-                        if (!a)
-                                continue;
-                        b = endswith(de->d_name, ".journal");
-                        if (!b)
-                                continue;
-
-                        u = strndup(a, b-a);
-                        if (!u) {
-                                log_oom();
-                                break;
-                        }
-
-                        r = parse_uid(u, &uid);
-                        if (r < 0) {
-                                log_debug_errno(r, "Failed to parse UID from file name '%s', ignoring: %m", de->d_name);
-                                continue;
-                        }
-
-                        /* Already rotated in the above loop? i.e. is it an open user journal? */
-                        if (ordered_hashmap_contains(s->user_journals, UID_TO_PTR(uid)))
-                                continue;
-
-                        full = strjoin(path, de->d_name);
-                        if (!full) {
-                                log_oom();
-                                break;
-                        }
-
-                        fd = openat(dirfd(d), de->d_name, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW|O_NONBLOCK);
-                        if (fd < 0) {
-                                log_full_errno(IN_SET(errno, ELOOP, ENOENT) ? LOG_DEBUG : LOG_WARNING, errno,
-                                               "Failed to open journal file '%s' for rotation: %m", full);
-                                continue;
-                        }
-
-                        /* Make some room in the set of deferred close()s */
-                        server_vacuum_deferred_closes(s);
-
-                        /* Open the file briefly, so that we can archive it */
-                        r = journal_file_open(fd,
-                                              full,
-                                              O_RDWR,
-                                              0640,
-                                              s->compress.enabled,
-                                              s->compress.threshold_bytes,
-                                              s->seal,
-                                              &s->system_storage.metrics,
-                                              s->mmap,
-                                              s->deferred_closes,
-                                              NULL,
-                                              &f);
-                        if (r < 0) {
-                                log_warning_errno(r, "Failed to read journal file %s for rotation, trying to move it out of the way: %m", full);
-
-                                r = journal_file_dispose(dirfd(d), de->d_name);
-                                if (r < 0)
-                                        log_warning_errno(r, "Failed to move %s out of the way, ignoring: %m", full);
-                                else
-                                        log_debug("Successfully moved %s out of the way.", full);
-
-                                continue;
-                        }
-
-                        TAKE_FD(fd); /* Donated to journal_file_open() */
-
-                        r = journal_file_archive(f);
-                        if (r < 0)
-                                log_debug_errno(r, "Failed to archive journal file '%s', ignoring: %m", full);
-
-                        f = journal_initiate_close(f, s->deferred_closes);
-                }
-        }
+        /* Finally, also rotate all user journals we currently do not have open. (But do so only if we
+         * actually have access to /var, i.e. are not in the log-to-runtime-journal mode). */
+        if (!s->runtime_journal)
+                (void) vacuum_offline_user_journals(s);
 
         server_process_deferred_closes(s);
 }