SoundSoftware Code Site

#!/bin/bash

set -e

progdir=$(dirname $0)

case "$progdir" in

    /*) ;;

    *) progdir="$(pwd)/$progdir" ;;

esac

rails_scriptdir="$progdir/../../script"

rails="$rails_scriptdir/rails"

if [ ! -x "$rails" ]; then

    echo "Expected to find rails executable at $rails"

    exit 2

fi

fastexport="$progdir/../fast-export/hg-fast-export.sh"

if [ ! -x "$fastexport" ]; then

    echo "Expected to find hg-fast-export.sh executable at $fastexport"

    exit 2

fi

environment="$1"

hgdir="$2"

gitdir="$3"

if [ -z "$hgdir" ] || [ -z "$gitdir" ]; then

    echo "Usage: $0 <environment> <hgdir> <gitdir>"

    echo "  where"

    echo "  - environment is the Rails environment (development or production)"

    echo "  - hgdir is the directory containing project Mercurial repositories"

    echo "  - gitdir is the directory in which output git repositories are to be"

    echo "    created or updated"

    exit 2

fi

if [ ! -d "$hgdir" ]; then

    echo "Mercurial repository directory $hgdir not found"

    exit 1

fi

if [ ! -d "$gitdir" ]; then

    echo "Target git repository dir $gitdir not found (please create at least the empty directory)"

    exit 1

fi

set -u

authordir="$gitdir/__AUTHORMAPS"

mkdir -p "$authordir"

wastedir="$gitdir/__WASTE"

mkdir -p "$wastedir"

echo

echo "$0 starting at $(date)"

echo "Extracting author maps..."

# Delete any existing authormap files, because we want to ensure we

# don't have an authormap for any project that was exportable but has

# become non-exportable (e.g. has gone private)

rm -f "$authordir/*"

"$rails" runner -e "$environment" "$progdir/create-repo-authormaps.rb" \

	 -s "$hgdir" -o "$authordir"

for hgrepo in "$hgdir"/*; do

    if [ ! -d "$hgrepo/.hg" ]; then

	echo "Directory $hgrepo does not appear to be a Mercurial repo, skipping"

	continue

    fi

    reponame=$(basename "$hgrepo")

    authormap="$authordir/authormap_$reponame"

    git_repodir="$gitdir/$reponame"

    if [ ! -f "$authormap" ]; then

	echo "No authormap file was created for repo $reponame, skipping"

	# If there is no authormap file, then we should not have a git

	# mirror -- this is a form of access control, not just an

	# optimisation (authormap files are expected to exist for all

	# exportable projects, even if empty). So if a git mirror

	# exists, we move it away

	if [ -d "$git_repodir" ]; then

	    mv "$git_repodir" "$wastedir/$(date +%s).$reponame"

	fi

	continue

    fi

    if [ ! -d "$git_repodir" ]; then

	git init --bare "$git_repodir"

    fi

    echo

    echo "About to run fast export for repo $reponame..."

    (

	cd "$git_repodir"

        # Force is necessary because git-fast-import (or git) can't handle

        # branches having more than one head ("Error: repository has at

        # least one unnamed head"), which happens from time to time in

        # valid Hg repos. With --force apparently it will just pick one

        # of the two heads arbitrarily, which is also alarming but is

        # more likely to be useful

	"$fastexport" --quiet -r "$hgrepo" --hgtags -A "$authormap" --force

        git update-server-info

    )

    echo "Fast export done"

done

echo "$0 finishing at $(date)"