script/build-with-container: cache git branch result

Cache the branch we got from the git command as it is highly unlikely
to change during the script execution and if it does -- we mostly don't
care anyway.

Signed-off-by: John Mulligan <jmulligan@redhat.com>
(cherry picked from commit e562aa086197c2950c9ebb9f8f112e88e1e6e666)

diff --git a/src/script/build-with-container.py b/src/script/build-with-container.py
index 112fd6528abf7c54e93cbeecaaa713ced4ed6f93..3ac94ff886c1ec998e31b7ec86802eb4851a83ca 100755 (executable)
--- a/src/script/build-with-container.py
+++ b/src/script/build-with-container.py
@@ -249,6 +249,9 @@ def _git_command(ctx, args):
     return cmd
 
 
+# Assume that the git version will not be changing after the 1st time
+# the command is run.
+@functools.cache
 def _git_current_branch(ctx):
     cmd = _git_command(ctx, ["rev-parse", "--abbrev-ref", "HEAD"])
     res = _run(cmd, check=True, capture_output=True)