add script to verify that the ls-remote files matches the branches/tags

in the tree..

verify.sh

@@ -0,0 +1,53 @@
+#!/bin/sh
+
+verifylsremote()
+{
+	fname="$1"
+
+	# $ git show-ref gm/2021-09-23T00Z/github.com--lark-parser-lark/0.6.6
+	# 2b3fabd01cec3f6803ec7d255bf0436476c2b812 refs/tags/gm/2021-09-23T00Z/github.com--lark-parser-lark/0.6.6
+	# $ grep '0.6.6$' gm/github.com--lark-parser-lark/2021-09-23T00Z.refs.txt 
+	# 2b3fabd01cec3f6803ec7d255bf0436476c2b812	refs/tags/0.6.6
+
+	projname="${fname#gm/}"
+	projname="${projname%/*}"
+	date="${fname##*/}"
+	date="${date%.refs.txt}"
+
+	while read hash refname; do
+		part="${refname##*/}"
+		header="${refname%/*}"
+
+		if [ x"$refname" = x"HEAD" ]; then
+			continue
+		fi
+
+		if [ x"$header" != x"refs/head" -a x"$header" != x"refs/tags" ]; then
+			# skipping non-branch, non-tags
+			continue
+		fi
+
+		read outphash outrefname << INNEREOF
+$(git show-ref "gm/$date/$projname/$part")
+INNEREOF
+		if [ x"$outphash" != x"$hash" ]; then
+			echo "Hash does not match for $refname in $fname:"
+			echo "$hash != $outphash"
+		fi
+		if [ x"${outrefname%/gm/*}" != x"$header" ]; then
+			echo "Type does not match for $refname in $fname:"
+			echo "${outrefname%/gm/*} != $header"
+		fi
+		if [ x"${outrefname##*/}" != x"$part" ]; then
+			echo "Name does not match for $refname in $fname:"
+			echo "${outrefname##*/} != $part"
+		fi
+
+	done <<EOF
+$(cat "$fname")
+EOF
+}
+
+for i in gm/*/*; do
+	verifylsremote "$i"
+done