#!/bin/bash
set -e

abort() { local x=$1; shift; for i in "$@"; do echo >&2 "$0: abort: $i"; done; exit "$x"; }

if [ "$(basename "$PWD")" != "build" ]; then
	abort 1 "This script is only meant to be run from the build/ directory."
fi

if [ -n "$DEBCARGO" ]; then
	true
elif which debcargo >/dev/null; then
	DEBCARGO=$(which debcargo)
elif [ -f "$HOME/.cargo/bin/debcargo" ]; then
	DEBCARGO="$HOME/.cargo/bin/debcargo"
else
	abort 1 "debcargo not found, run \`cargo install debcargo\` or set DEBCARGO to point to it"
fi

CRATE="$1"
VER="$2"
if test -z "$VER" -o -f "$VER"; then
	VER=""
	shift
else
	shift 2
fi
DISTRIBUTION="${DISTRIBUTION:-unstable}"

PKGNAME=$($DEBCARGO deb-src-name "$CRATE" $VER || abort 1 "couldn't find crate $CRATE")
DEBVER=$(dpkg-parsechangelog -l $PKGNAME/debian/changelog -SVersion)
DEBSRC=$(dpkg-parsechangelog -l $PKGNAME/debian/changelog -SSource)
DEBDIST=$(dpkg-parsechangelog -l $PKGNAME/debian/changelog -SDistribution)
DEB_HOST_ARCH=$(dpkg-architecture -q DEB_HOST_ARCH)
if [ -z "$CHROOT" ] && schroot -i -c "debcargo-unstable-${DEB_HOST_ARCH}-sbuild" >/dev/null 2>&1; then
	CHROOT="debcargo-unstable-${DEB_HOST_ARCH}-sbuild"
fi

shouldbuild() {
	local dst="$1"
	local src="$2"
	test ! -e "$dst" -o "$src" -nt "$dst"
}

if shouldbuild ${DEBSRC}_${DEBVER}.dsc "$PKGNAME/debian/changelog" ]; then
	( cd "$PKGNAME" && dpkg-buildpackage -d -S --no-sign )
	# sign if not UNRELEASED
	if echo "$DEBDIST" | grep -qv UNRELEASED-FIXME-AUTOGENERATED-DEBCARGO; then
		debsign ${DEBSRC}_${DEBVER}_source.changes
	fi
fi

check_build_deps() {
	mkdir -p dpkg-dummy
	if shouldbuild dpkg-dummy/status /var/cache/apt/pkgcache.bin; then
		# pretend dpkg status file that marks all packages as installed
		# this is because dpkg-checkbuilddeps only works on installed pkgs
		apt-cache dumpavail -o APT::Default-Release=unstable | \
		sed -e 's/Package: .*/\0\nStatus: install ok installed/g' > dpkg-dummy/status
	fi
	( cd "$PKGNAME" && dpkg-checkbuilddeps --admindir=../dpkg-dummy )
}

if ! check_build_deps; then
	if [ "$IGNORE_MISSING_BUILD_DEPS" != 1 ]; then
		abort 1 "Missing build-dependencies, but maybe try '{apt,cargo} update'"
	fi
fi

if [ "$SOURCEONLY" = 1 ]; then
	exit
fi

sbuild --no-source --arch-any --arch-all \
  ${CHROOT:+-c $CHROOT} \
  ${DISTRIBUTION:+-d $DISTRIBUTION} \
  ${@/#/--extra-package=} \
  ${DEBSRC}_${DEBVER}.dsc
changestool ${DEBSRC}_${DEBVER}_${DEB_HOST_ARCH}.changes adddsc ${DEBSRC}_${DEBVER}.dsc

# sign if not UNRELEASED
if echo "$DEBDIST" | grep -qv UNRELEASED-FIXME-AUTOGENERATED-DEBCARGO; then
	debsign ${DEBSIGN_KEYID:+-k $DEBSIGN_KEYID }--no-re-sign ${DEBSRC}_${DEBVER}_${DEB_HOST_ARCH}.changes
fi