core: nicer message when inotify watches are exhausted

inotify_add_watch returns ENOSPC, which translates to
"No space left on device", which is misleading.

https://bugs.freedesktop.org/show_bug.cgi?id=73628
(cherry picked from commit 18abe7bd3e13525b257da69ac49ff7841c289567)

1 files changed, 2 insertions, 1 deletions

diff --git a/src/core/path.c b/src/core/path.c
index 20e454d96..f54c77f6c 100644
--- a/src/core/path.c
+++ b/src/core/path.c
@@ -99,7 +99,8 @@ int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) {
                                 break;
                         }
 
-                        log_warning("Failed to add watch on %s: %m", s->path);
+                        log_warning("Failed to add watch on %s: %s", s->path,
+                                    errno == ENOSPC ? "too many watches" : strerror(-r));
                         r = -errno;
                         if (cut)
                                 *cut = tmp;