first cut of this..

README.md

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+GITMIRROR
+=========
+
+This repo is a mirror of various repositories that I want to keep track of.
+I realized that git, w/ it's inharently dedupability, and the ability to
+store many trees in a single repo, that it'd be easy to create a repo that
+regularly clones/mirrors other source repos.  Not only this, but the
+state of the tags and branches can be archived on a daily basis,
+consuming very little space.
+
+The main reason that I want this is from a supply chain availability
+perspective.  As a consumer of source, it isn't always guaranteed that
+the project you depend upon will continue to exist in the future.  It
+could also be that older version are removed, etc.
+
+Process
+-------
+
+1. Repo will self update main to get latest repos/code to mirror.
+2. Fetch the repos to mirror into their respective date tagged tags/branches.
+3. Push the tags/branches to the parent.
+4. Repeate

doupdate.sh

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+#!/bin/sh
+
+runtime=$(TZ=UTC date +'%Y-%m-%dT%HZ')
+
+while read repourl name c; do
+	baseref="gm/$runtime/$name"
+	git fetch --dry-run --no-tags "$repourl" +refs/tags/*:refs/tags/"$baseref/*" +refs/heads/*:refs/heads/"$baseref/*"
+done <<EOF
+$(python3 reponames.py < repos.txt)
+EOF

reponames.py

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+import re
+import sys
+import unittest
+
+# man git-check-ref-format
+
+reponameregex = re.compile(r'^(https://(?P<domain>github\.com)/(?P<slashpath>.*)\.git$)')
+
+def doconvert(i):
+	mat = reponameregex.match(i)
+
+	gd = mat.groupdict()
+
+	p = gd['slashpath'].replace('/', '-')
+
+	return '%s--%s' % (gd['domain'], p)
+
+if __name__ == '__main__':
+	for i in sys.stdin:
+		i = i.strip()
+		if not i or i.startswith('#'):
+			continue
+
+		print(i, doconvert(i))
+
+class _TestCases(unittest.TestCase):
+	def test_foo(self):
+		data = [
+			('https://github.com/python/cpython.git', 'github.com--python-cpython'),
+		]
+
+		for i in data:
+			r = doconvert(i[0])
+
+			self.assertEqual(r, i[1], msg='%s resulting in %s, should have been %s' % tuple(repr(x) for x in (i[0], r, i[1])))

repos.txt

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+#https://github.com/python/cpython.git
+https://github.com/lark-parser/lark.git