# Copyright (C) 2015 Facebook, Inc
# Maintained by Ryan McElroy <rm@fb.com>
#
# Distributed under the GNU General Public License, version 2.0.
#
#!/bin/bash -e

if [[ $# -ne 2 ]]; then
  PROGNAME="$(basename $0)"
  cat <<END
Usage: $PROGNAME <src> <dst>

This script enables the Mercurial share extension, shares a repository from
'src' to 'dst', and copies the .hg/hgrc configuration from 'src' to 'dst'.
This allows sharing repositories with non-standard configurations like we have
here at Facebook.

In the future, this functionality will probably be folded into the share
extension directly.
END
exit 1
fi

src="$1"
dst="$2"

hg --config "extensions.share=" share --noupdate --bookmarks "$src" "$dst"

echo "Setting up configuration..."
cp "$src/.hg/hgrc" "$dst/.hg/hgrc"

# Force share on in this repo, regardless of global setting.
# This ensures that bookmark shares will work
# (basic sharing works even without extension).
if [[ ! $(grep -q "^share=$" "$dst/.hg/hgrc") ]]; then
  cat >> "$dst/.hg/hgrc" <<END
[extensions]
share=
END
fi

# For forward compatibility, write "bookmarks" into the "shared" file.
# See http://patchwork.serpentine.com/patch/7488/
echo "bookmarks" >> "$dst/.hg/shared"

# Copy over svn metadata since hgsvn and share are not aware of each other
if [[ -d $src/.hg/svn ]]; then
  echo "Copying svn metadata..."
  cp -R $src/.hg/svn $dst/.hg/
fi

if [[ -e $src/.hg/sparse  ]]; then
  echo "Copying sparse profile..."
  cp $src/.hg/sparse $dst/.hg/
fi

echo "Updating new repository..."
hg --cwd "$dst" update $(hg --cwd "$src" log -r . -T '{node}')

echo "Set up new Mercurial Working Directory in '$dst' based on '$src'..."