sd-journal: introduce has_runtime_files and has_persistent_files

Also introduce sd_journal_has_runtime_files() and
sd_journal_has_persistent_files() to the public API. These functions
can be used to easily find out if the open journal files are runtime
and/or persistent.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
index cd5160154a..74a5e262f8 100644
--- a/src/journal/sd-journal.c
+++ b/src/journal/sd-journal.c
@@ -1292,6 +1292,12 @@ static int add_file(sd_journal *j, const char *prefix, const char *filename) {
                 return 0;
 
         path = strjoina(prefix, "/", filename);
+
+        if (!j->has_runtime_files && path_startswith(path, "/run/log/journal"))
+                j->has_runtime_files = true;
+        else if (!j->has_persistent_files && path_startswith(path, "/var/log/journal"))
+                j->has_persistent_files = true;
+
         return add_any_file(j, path);
 }
 
@@ -2630,3 +2636,15 @@ _public_ int sd_journal_get_data_threshold(sd_journal *j, size_t *sz) {
         *sz = j->data_threshold;
         return 0;
 }
+
+_public_ int sd_journal_has_runtime_files(sd_journal *j) {
+        assert_return(j, -EINVAL);
+
+        return j->has_runtime_files;
+}
+
+_public_ int sd_journal_has_persistent_files(sd_journal *j) {
+        assert_return(j, -EINVAL);
+
+        return j->has_persistent_files;
+}