misc: add branch archiving script

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

bin/archive-branches.sh

+#!/usr/bin/env bash
+set -euo pipefail
+IFS=$'\n\t'
+set -x
+
+auth=""
+#auth="-u kubuxu:$GH_TOKEN"
+org=ipfs
+repo=go-ipfs
+arch_repo=go-ipfs-archived
+api_repo="repos/$org/$repo"
+
+exclusions=(
+	'master'
+	'release'
+)
+
+gh_api_next() {
+	links=$(grep '^Link:' | sed -e 's/Link: //' -e 's/, /\n/g')
+	echo "$links" | grep '; rel="next"' >/dev/null || return
+	link=$(echo "$links" | grep '; rel="next"' | sed -e 's/^<//' -e 's/>.*//')
+
+	curl $auth -f -sD >(gh_api_next) $link
+}
+
+gh_api() {
+	curl $auth -f -sD >(gh_api_next) "https://api.github.com/$1" | jq -s '[.[] | .[]]'
+}
+
+pr_branches() {
+	gh_api "$api_repo/pulls" |  jq -r '.[].head.label | select(test("^ipfs:"))' \
+		| sed 's/^ipfs://'
+}
+
+origin_refs() {
+	format=${1-'%(refname:short)'}
+
+	git for-each-ref --format "$format" refs/remotes/origin | sed 's|^origin/||'
+}
+
+active_branches() {
+	origin_refs '%(refname:short) %(committerdate:unix)' |awk \
+'	BEGIN { monthAgo = systime() - 31*24*60*60 }
+	{ if ($2 > monthAgo) print $1 }
+'
+}
+
+git remote add archived "git@github.com:$org/$arch_repo.git" || true
+
+cat <(active_branches) <(pr_branches) <((IFS=$'\n'; echo "${exclusions[*]}")) \
+	| sort -u | comm - <(origin_refs | sort) -13 |\
+	while read ref; do
+		git push archived "origin/$ref:refs/heads/$ref/$(date --rfc-3339=date)"
+		git push origin --delete "$ref"
+	done
+