Migrate git repositories from 'git://' to 'https://'

git-migrate.sh

#!/bin/bash

# Migrate git repositories from 'git://' to 'https://'
# Usage: git-migrate.sh [path] [...]
# Usage: find ~ -type d -exec test -d "{}/.git" \; -print0 -prune | xargs -0 git-migrate.sh > /tmp/out 2> /tmp/err
#
# Scans through the git repositories listed on the command line to
# produce a set of commands (on stdout) that can be used to migrate
# everything from using 'git://' to 'https://'. Modified URLs are
# validated to work first by performing a test clone -- any errors
# can be seen on stderr for later follow-up.
#
# If you get prompted to enter login credentials (since some sites
# require login for HTTPS git access), just hit enter to bypass them.
# They will be logged to stderr as inaccessible.

shopt -s nocasematch
export GIT_DISCOVERY_ACROSS_FILESYSTEM=1
TEMPROOT=$(mktemp -d)

echo "Looking for URLs to fix... Please wait." >&2

for D in "$@"; do
	sh -c "git -C \"${D}\" remote -v || echo ERROR using ${D} >&2" | while read REMOTE; do
		FETCHURL=$(echo $REMOTE | awk '{print $2}')
		REMOTE=$(echo $REMOTE | awk '{print $1}')
		MODURL=""

		#echo -e "${D}\t${REMOTE}\t${FETCHURL}"

		if [[ -z "${FETCHURL}" ]]; then continue; fi

		if [[ "${FETCHURL:0:6}" != "git://" ]]; then continue; fi

		# Tweak the FETCHURL to work over HTTPS
		FETCHURL="${FETCHURL:6}"
		case ${FETCHURL} in
		*git.code.sf.net*|*git.sourceforge.net*)
			MODURL="http://${FETCHURL}"
			;;
		*anongit.freedesktop.org*)
			MODURL="https://${FETCHURL/anongit.freedesktop.org/anongit.freedesktop.org\/git}"
			;;
		git.freedesktop.org*)
			MODURL="https://anon${FETCHURL}"
			;;
		git.gnome.org*)
			MODURL="https://${FETCHURL/\//\/browse/}"
			;;
		*)
			MODURL="https://${FETCHURL}"
			;;
		esac

		# Attempt to clone MODURL to see if it actually works...
		# If it doesn't, print out an error. If it does, print
		# out the command which will change the remote's URL to
		# MODURL.
		TEMPDIR=$(mktemp -d --tmpdir="${TEMPROOT}")
		git clone -q --bare --depth 1 "${MODURL}" "${TEMPDIR}"
		if [[ $? -ne 0 ]]; then
			echo "ERROR cloning ${MODURL}" >&2
		else
			echo git -C \"${D}\" remote set-url \"${REMOTE}\" \"${MODURL}\"
		fi

		rm -rf "${TEMPDIR}"
	done
done
rm -rf "${TEMPROOT}"