1 files changed, 7 insertions, 6 deletions
diff --git a/acid/acid-source b/acid/acid-source
index 8242452..d03076f 100755
--- a/acid/acid-source
+++ b/acid/acid-source
@@ -6,21 +6,22 @@
 # <name> doesn't exist.  If updates are found, we attempt to checkout the newest
 # version according to <ref-pattern> (see <pattern> from git-for-each-ref(1)).
 #
-# On a successful run, the new object hash is printed to stdout (or the previous
-# hash, if no update occurred).  This may be a commit hash.  However, if
-# <ref-pattern> matches an annotated tag, then the hash refers to the tag object.
-# The caller should cache this hash value upon successful deployment.
+# On a successful run, the new commit hash is printed to stdout (or the previous
+# hash, if no update occurred).  The caller should cache this hash value upon
+# successful deployment.
 #
 # If a new version of the file tree is checked out, this file exits with code 1,
 # otherwise a stale success exits with 0.  On any error, the null hash is
 # printed, and we exit with 2.
 
 gethash() {
-    git for-each-ref \
+    obj=$(git for-each-ref \
         --count=1 \
         --format='%(objectname)' \
         --sort='-creatordate' \
-        "$1" # pattern
+        "$1") # pattern
+
+    git rev-parse --quiet --verify "$obj^{commit}"
 }
 
 fail() {