From 3045db86f9185f6de78f85099159330dfc1a0e9e Mon Sep 17 00:00:00 2001
From: Stef Walter <stefw@redhat.com>
Date: Fri, 14 Aug 2015 16:38:41 +0200
Subject: [PATCH] journalctl: make sure 'journalctl -f -t unmatched' blocks

Previously the following command:

$ journalctl -f -t unmatchedtag12345

... would block when called with criteria that did not match any
journal lines. Once log lines appeared that matched the criteria
they were displayed.

Commit 02ab86c732576a71179ce12e97d44c289833236d broke this
behavior and the journal was not followed, but the command
exits with '-- No entries --' displayed.

This commit fixes the issue.

More information downstream:

https://bugzilla.redhat.com/show_bug.cgi?id=1253649

Cherry-picked from: c51e1a96359b3f4d374345593b11273df2132b93
Related: #1350232
---
 src/journal/journalctl.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 904aae99e..2688d8b2e 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -2142,8 +2142,12 @@ int main(int argc, char *argv[]) {
         }
 
         if (r == 0) {
-                printf("-- No entries --\n");
-                return EXIT_SUCCESS;
+                if (arg_follow)
+                        need_seek = true;
+                else {
+                        printf("-- No entries --\n");
+                        return EXIT_SUCCESS;
+                }
         }