[PATCH OB] debuginfod-client.c: Skip empty file creation for cancelled queries

[Aaron Merey <amerey@redhat.com>]

Committing as obvious.

Empty files in the client cache are used to indicate that contacted
servers could not find a requested resource.  Future queries for this
resource will not be attempted until the cache_miss_s duration has
passed.

Currently these empty files are also created when a query is cancelled
through the client's progressfn.  This can occur, for example, when a
user cancels a download with ctrl-c.

This prevents user-cancelled queries from being retried promptly without
having to modify cache_miss_s.  Fix this by skipping the creation of an
empty cache file when progressfn cancels a query.

Signed-off-by: Aaron Merey <amerey@redhat.com>
---
 debuginfod/ChangeLog           | 5 +++++
 debuginfod/debuginfod-client.c | 6 +++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/debuginfod/ChangeLog b/debuginfod/ChangeLog
index f861eb72..5db5a753 100644
--- a/debuginfod/ChangeLog
+++ b/debuginfod/ChangeLog
@@ -1,3 +1,8 @@
+2023-03-17  Aaron Merey  <amerey@redhat.com>
+
+	* debuginfod-client.c (debuginfod_query_server): Do not create an
+	empty file in the cache if the query was cancelled by the progressfn.
+
 2023-02-07  Aaron Merey  <amerey@redhat.com>
 
 	* debuginfod-client.c (cache_find_section): Avoid returning -ENOENT
diff --git a/debuginfod/debuginfod-client.c b/debuginfod/debuginfod-client.c
index ef4d47e3..b33408eb 100644
--- a/debuginfod/debuginfod-client.c
+++ b/debuginfod/debuginfod-client.c
@@ -1667,9 +1667,9 @@ debuginfod_query_server (debuginfod_client *c,
         }
     } while (num_msg > 0);
 
-  /* Create an empty file named as $HOME/.cache if the query fails
-     with ENOENT.*/
-  if (rc == -ENOENT)
+  /* Create an empty file in the cache if the query fails with ENOENT and
+     it wasn't cancelled early.  */
+  if (rc == -ENOENT && !c->progressfn_cancel)
     {
       int efd = open (target_cache_path, O_CREAT|O_EXCL, DEFFILEMODE);
       if (efd >= 0)
-- 
2.39.2