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#!/bin/bash
source common.sh
set -eu
set -o pipefail
function usage() {
echo "tvlc new [-n|--name CLIENTNAME] [derivation...]"
echo ""
cat <<EOF
The 'new' command creates a new git sparse checkout with the given name, and
contents needed to build the Nix derivation(s) specified on the command line.
Options:
-n/--name client-name: Sets the git branch and nice checkout name for the
workspace. If the option is not provided, the name will be based on the
first non-option command-line argument.
--branch branch-name: Sets the git branch name only.
EOF
}
checkout_name=
branch_name=
options=$(getopt -o 'n:' --long debug --long name: -- "$@")
eval set -- "$options"
while true; do
case "$1" in
-h)
usage
exit 0
;;
-v)
version
exit 0
;;
-n|--name)
shift
checkout_name="$1"
if [ -z "$branch_name" ]; then
branch_name=tvlc-"$1"
fi
;;
--branch)
shift
branch_name="$1"
;;
--)
shift
break
;;
esac
shift
done
if [ $# -eq 0 ]; then
echo "error: workspace name, target derivations required"
exit 1
fi
if [ -z "$checkout_name" ]; then
# TODO(riking): deduce
echo "error: workspace name (-n) required"
exit 1
fi
if [ -d "$nice_checkout_root/$checkout_name" ]; then
echo "error: checkout $checkout_name already exists"
# nb: shellescape checkout_name because we expect the user to copy-paste it
# shellcheck disable=SC1003
echo "consider deleting it with tvlc remove '${checkout_name/'/\'}'"
exit 1
fi
if [ -f "$DEPOT_ROOT/.git/refs/heads/$branch_name" ]; then
echo "error: branch $branch_name already exists in git"
# shellcheck disable=SC1003
echo "consider deleting it with cd $DEPOT_ROOT; git branch -d '${checkout_name/'/\'}'"
exit 1
fi
# The big one: call into Nix to figure out what paths the desired derivations depend on.
readarray -t includedPaths < <("$depot_scanner" --mode 'print' --only 'DEPOT' --relpath --depot "$DEPOT_ROOT" --nix-bin "$tvix_instantiate" "$@")
# bash math
checkout_id=$(("$(cat "$tvlc_root/next_clientid")"))
next_checkout_id=$(("$checkout_id"+1))
echo "$next_checkout_id" > "$tvlc_root/next_clientid"
checkout_dir="$tvlc_root/clients/$checkout_id"
mkdir "$checkout_dir"
cd "$DEPOT_ROOT"
git worktree add --no-checkout -b "$branch_name" "$checkout_dir"
# BUG: git not creating the /info/ subdir
mkdir "$DEPOT_ROOT/.git/worktrees/$checkout_id/info"
cd "$checkout_dir"
git sparse-checkout init --cone
git sparse-checkout set "${includedPaths[@]}"
ln -s "$checkout_dir" "$nice_checkout_root"/"$checkout_name"
echo "$nice_checkout_root/$checkout_name"
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