1 files changed, 15 insertions, 0 deletions
diff --git a/common b/common
new file mode 100644
index 0000000..3204673
--- /dev/null
+++ b/common
@@ -0,0 +1,15 @@
+#!/hint/bash
+
+gen_rev() {
+  printf 'REV:%s\n' "$(
+    date -u -Iseconds \
+    | sed 's@+00:00$@Z@'
+  )"
+}
+
+git_dir="$1"
+
+if [ ! -d "${git_dir}" ]; then
+  >&2 printf 'invalid git dir: "%s"\n' "${git_dir}"
+  exit 1
+fi