gbp_retag_commit.sh: check that we are in a debian branch

diff --git a/gbp_retag_commit.sh b/gbp_retag_commit.sh
index e2a095b..4bffd36 100755 (executable)
--- a/gbp_retag_commit.sh
+++ b/gbp_retag_commit.sh
@@ -20,6 +20,11 @@ HASH="$1"
 git cat-file -e "${HASH}^{commit}" || { usage 1>&2; exit 1; }
 
 CHANGELOG_HEADER="$(git show $HASH:debian/changelog | head -1)"
+if [ "x$CHANGELOG_HEADER" = "x" ];
+then
+  echo "Check that the active branch is a debian branch" 1>&2
+  exit 1
+fi
 
 # TODO: give a warning or an error if this is is an UNRELEASED version?