journal: add sd_journal_open_files

This allows the caller to explicitly specify which journal files
should be opened. The same functionality could be achieved before
by creating a directory and playing around with symlinks. It
is useful to debug stuff and explore the journal, and has been
requested before.

Waiting is supported, the journal will notice modifications on
the files supplied when opening the journal, but will not add
any new files.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/journal/journal-internal.h b/src/journal/journal-internal.h
index f576a0073d..5b717f86f7 100644
--- a/src/journal/journal-internal.h
+++ b/src/journal/journal-internal.h
@@ -123,6 +123,7 @@ struct sd_journal {
         uint64_t unique_offset;
 
         bool on_network;
+        bool no_new_files;
 
         size_t data_threshold;