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diff --git a/spec/fixtures/test.git/git/hooks/commit-msg.sample b/spec/fixtures/test.git/git/hooks/commit-msg.sample
new file mode 100755
index 0000000..b58d118
--- /dev/null
+++ b/spec/fixtures/test.git/git/hooks/commit-msg.sample
@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# An example hook script to check the commit log message.
+# Called by "git commit" with one argument, the name of the file
+# that has the commit message.  The hook should exit with non-zero
+# status after issuing an appropriate message if it wants to stop the
+# commit.  The hook is allowed to edit the commit message file.
+#
+# To enable this hook, rename this file to "commit-msg".
+
+# Uncomment the below to add a Signed-off-by line to the message.
+# Doing this in a hook is a bad idea in general, but the prepare-commit-msg
+# hook is more suited to it.
+#
+# SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
+# grep -qs "^$SOB" "$1" || echo "$SOB" >> "$1"
+
+# This example catches duplicate Signed-off-by lines.
+
+test "" = "$(grep '^Signed-off-by: ' "$1" |
+         sort | uniq -c | sed -e '/^[   ]*1[    ]/d')" || {
+        echo >&2 Duplicate Signed-off-by lines.
+        exit 1
+}