Recreate repository due to Git object corruption (all files preserved)

.git_corrupt_backup/hooks/commit-msg.sample

@@ -0,0 +1,25 @@
+#!/bin/sh
+# A sample hook to check commit messages created by `git commit`
+################################################################
+#
+# This example script checks commit messages for duplicate `Signed-off-by`
+# lines and rejects the commit if these are present.
+#
+# It is called by "git commit" with a single argument: the name of the file
+# that contains the final commit message, which would be used in the commit.
+# A a non-zero exit status after issuing an appropriate message stops the operation.
+# The hook is allowed to edit the commit message file by rewriting the file
+# containing it.
+#
+# To enable this hook remove the `.sample` suffix from this file entirely.
+
+# Check for duplicate Signed-off-by lines in the commit message.
+# The following command uses grep to find lines starting with "Signed-off-by: "
+# in the commit message file specified by the first argument `$1`.
+# It then sorts the lines, counts the number of occurrences of each line,
+# and removes any lines that occur only once.
+# If there are any remaining lines, it means there are duplicate Signed-off-by lines.
+test "$(grep '^Signed-off-by: ' "$1" | sort | uniq -c | sed -e '/^[ 	]*1[ 	]/d')" = "" || {
+	echo "Remove duplicate Signed-off-by lines and repeat the commit." 1>&2
+	exit 1
+}