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git/contrib/workdir/git-new-workdir
Paul Smith e32afab7b0 git-new-workdir: don't fail if the target directory is empty
Allow new workdirs to be created in an empty directory (similar to "git
clone").  Provide more error checking and clean up on failure.

Signed-off-by: Paul Smith <paul@mad-scientist.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-12-03 12:49:24 -08:00

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#!/bin/sh
usage () {
echo "usage:" $@
exit 127
}
die () {
echo $@
exit 128
}
failed () {
die "unable to create new workdir '$new_workdir'!"
}
if test $# -lt 2 || test $# -gt 3
then
usage "$0 <repository> <new_workdir> [<branch>]"
fi
orig_git=$1
new_workdir=$2
branch=$3
# want to make sure that what is pointed to has a .git directory ...
git_dir=$(cd "$orig_git" 2>/dev/null &&
git rev-parse --git-dir 2>/dev/null) ||
die "Not a git repository: \"$orig_git\""
case "$git_dir" in
.git)
git_dir="$orig_git/.git"
;;
.)
git_dir=$orig_git
;;
esac
# don't link to a configured bare repository
isbare=$(git --git-dir="$git_dir" config --bool --get core.bare)
if test ztrue = "z$isbare"
then
die "\"$git_dir\" has core.bare set to true," \
" remove from \"$git_dir/config\" to use $0"
fi
# don't link to a workdir
if test -h "$git_dir/config"
then
die "\"$orig_git\" is a working directory only, please specify" \
"a complete repository."
fi
# make sure the links in the workdir have full paths to the original repo
git_dir=$(cd "$git_dir" && pwd) || exit 1
# don't recreate a workdir over an existing directory, unless it's empty
if test -d "$new_workdir"
then
if test $(ls -a1 "$new_workdir/." | wc -l) -ne 2
then
die "destination directory '$new_workdir' is not empty."
fi
cleandir="$new_workdir/.git"
else
cleandir="$new_workdir"
fi
mkdir -p "$new_workdir/.git" || failed
cleandir=$(cd "$cleandir" && pwd) || failed
cleanup () {
rm -rf "$cleandir"
}
siglist="0 1 2 15"
trap cleanup $siglist
# create the links to the original repo. explicitly exclude index, HEAD and
# logs/HEAD from the list since they are purely related to the current working
# directory, and should not be shared.
for x in config refs logs/refs objects info hooks packed-refs remotes rr-cache svn
do
# create a containing directory if needed
case $x in
*/*)
mkdir -p "$new_workdir/.git/${x%/*}"
;;
esac
ln -s "$git_dir/$x" "$new_workdir/.git/$x" || failed
done
# commands below this are run in the context of the new workdir
cd "$new_workdir" || failed
# copy the HEAD from the original repository as a default branch
cp "$git_dir/HEAD" .git/HEAD || failed
# the workdir is set up. if the checkout fails, the user can fix it.
trap - $siglist
# checkout the branch (either the same as HEAD from the original repository,
# or the one that was asked for)
git checkout -f $branch