hg2git: initial commit

hg2git

@@ -0,0 +1,91 @@
+#!/bin/bash
+
+set -euo pipefail
+
+fatal() {
+	echo "$@" >&2
+	exit 1
+}
+
+main() {
+
+	local target="$1"
+
+	# Validate target hg repo
+	if [[ ! -d $target/.hg ]] ; then
+		fatal "${1} not a hg repo"
+	fi
+
+	# Convert to absolute path
+	{
+		cd "$target"
+		target=$(pwd)
+	}
+
+	(
+		cd "$target"
+		if [[ $(hg status | wc -l) -ne 0 ]] ; then
+			fatal "${1}: uncommited files, abandoning"
+		fi
+
+		if hg id | fgrep -q '+' ; then
+			fatal "${1}: uncommitted changes, abandoning"
+		fi
+
+		# Create 'master' hg bookmark, if there isn't one already
+		if ! hg bookmark | fgrep master ; then
+			hg bookmark master
+		fi
+	)
+
+	# Use mercurial-git plugin to convert to bare repo in /tmp/
+	local gitdir=$(mktemp -d /tmp/hg2git.XXXXXXXX)
+
+	(
+		cd "$gitdir"
+		git init --bare
+	)
+
+	(
+		cd "$target"
+		hg push "$gitdir"
+	)
+
+	# Move into place
+	local backupdir="$target.hg-converted-$(date -Iseconds)"
+	mv "$target" "$backupdir"
+
+	mkdir -p "${target}"
+
+	mv "$gitdir/" "$target/.git"
+
+	# Reconstruct working directory
+	(
+		cd "$target"
+		git config --local --bool core.bare false
+		git checkout master
+	)
+
+	# Copy over excluded files from the working directory
+	# (add trailing slash to source path)
+	rsync -avr "${backupdir}/" "$target" --exclude=.git --exclude=.hg
+
+	(
+		cd "$target"
+
+		# Remove hgtags file
+		if [[ -f ./.hgtags ]] ; then
+			git rm ./.hgtags
+			git commit -m "hg-git: remove old .hgtags file"
+		fi
+
+		# Convert hgignore->gitignore (partial)
+		if [[ -f ./.hgignore ]] ; then
+			git mv .hgignore .gitignore
+			sed -i '/^mode:/d' .gitignore
+			# leave in uncommitted state for further fixups
+		fi
+	)
+}
+
+main "$@"