#!/bin/bash

set -e

if test -f config.custom ; then
	. config.custom
else
	. config
fi

have_commit()
{
    git rev-parse --verify --quiet "$1^{commit}" >/dev/null
}

checkout_commit()
{
    local repo_name="$1"
    local repo_url="$2"
    local commit_variable="$3"
    local commit="${!3}"
    local old_url

    # Make sure there are no uncommitted changes.
    git status -s >& /dev/null
    if ! git diff-index --quiet HEAD --; then
	cat 1>&2 <<EOF
ERROR: $repo_name has uncommitted changes.

If you want to build from the (dirty) working tree of $repo_name,
remove $commit_variable from config.custom.
EOF
	exit 1
    fi

    # If we don't have the needed commit, try fetching from the remote.
    if ! have_commit "$commit"; then
	old_url="$(git remote get-url origin)"
	if [ "$old_url" != "$repo_url" ]; then
	    echo "$repo_name URL changed to $repo_url (previously was $old_url)"
	    git remote set-url origin "$repo_url"
	fi
	if ! git fetch origin; then
	    echo 1>&2 "ERROR: unable to fetch from $repo_url"
	    exit 1
	fi
	if ! have_commit "$commit"; then
	    echo 1>&2 "ERROR: commit $commit does not exist in $repo_url"
	    exit 1
	fi
    fi

    # Check out the commit.
    if [ "$(git rev-parse HEAD)" != "$(git rev-parse "$commit^{commit}")" ]
    then
	echo "Checking out $repo_name $commit (previously was $(git describe --always HEAD))"
    fi
    if [ -z "$NO_ACTION" ]; then
	git checkout --quiet "$commit"
    fi
}

setup_repo()
{
    local repo_name="$1"
    local repo_url_variable="$2"
    local repo_url="${!2}"
    local commit_variable="$3"
    local commit="${!3}"
    local required="$4"

    # Clone the repository if needed.
    if [ ! -d "$repo_name" ]; then
	if [ -z "$repo_url" ]; then
	    if ! $required; then
		return
	    fi
	    echo 1>&2 "$repo_url_variable not set; check your config file!"
	    exit 1
	fi

	echo
	if [ -n "$NO_ACTION" ]; then
	    echo "Clone $repo_url into $repo_name"
	    if [ -n "$commit" ]; then
		echo "Checkout commit $commit into $repo_name"
		return
	    fi
	else
	    mkdir -p $(dirname "$repo_name")
	    if ! git clone "$repo_url" "$repo_name"; then
		echo 1>&2 "Failed to clone $repo_name from $repo_url"
		exit 1
	    fi
	fi
    fi

    if [ -z "$repo_url" ] && ! $required; then
	cat 1>&2 <<EOF
ERROR: $repo_url_variable has been removed from the config file,
but the $repo_name directory still exists.  Remove it if you don't
want it to be built.
EOF
	exit 1
    fi

    # If a specific commit was specified, check it out.
    if [ -n "$commit" ]; then
	( cd "$repo_name";
	  checkout_commit "$repo_name" "$repo_url" "$commit_variable";
	)
    fi
}

while [ "$1" != "" ]; do
    case $1 in
	-n|--no-action)
	    NO_ACTION=echo
	    ;;
	*)
	    echo "usage: get-all [--no-action]"
	    exit 1
	    ;;
    esac
    shift
done


# required repositories
setup_repo fio			FIO_GIT		FIO_COMMIT		true
setup_repo quota		QUOTA_GIT	QUOTA_COMMIT		true
setup_repo xfsprogs-dev		XFSPROGS_GIT	XFSPROGS_COMMIT		true
setup_repo xfstests-dev		XFSTESTS_GIT	XFSTESTS_COMMIT		true
setup_repo fsverity		FSVERITY_GIT	FSVERITY_COMMIT		true
setup_repo ima-evm-utils	IMA_EVM_UTILS_GIT IMA_EVM_UTILS_COMMIT	true

# optional repositories
setup_repo keyutils		KEYUTILS_GIT	KEYUTILS_COMMIT		false
setup_repo stress-ng		STRESS_NG_GIT	STRESS_NG_COMMIT	false
setup_repo util-linux		UTIL_LINUX_GIT	UTIL_LINUX_COMMIT	false
setup_repo go/src/github.com/google/syzkaller SYZKALLER_GIT SYZKALLER_COMMIT false

# Make sure acl doesn't try regenerate these files because of the
# vagrancies of the timestamps when they were checked out
touch acl/aclocal.m4 acl/configure acl/Makefile.in