add comment for head

Signed-off-by: Xiang Dai <764524258@qq.com>
grafana · Aug 19, 2019 · a39b154 · a39b154
1 parent 0bcab59
commit a39b154
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/tools/image-tag b/tools/image-tag
@@ -6,6 +6,8 @@ set -o pipefail
 
 WIP=$(git diff --quiet || echo '-WIP')
 BRANCH=$(git rev-parse --abbrev-ref HEAD | sed 's#/#-#g')
+# When 7 chars are not enough to be unique, git automatically uses more.
+# We are forcing to 7 here, as we are doing for grafana/grafana as well.
 SHA=$(git rev-parse --short=7 HEAD | head -c7)
 
 # If this is a tag, use it,                      otherwise branch-hash