bm-prep-ownpackage-branches () {
	cat <<'END' >$tmp/stunt-git
#!/bin/sh -e
case "$*" in
*clean*) echo >&2 "BUILD-MODES PROGRAM git $*" ;;
esac
exec git "$@"
END
	chmod +x $tmp/stunt-git

	bm_branches="$1"
}

bm-prep () {
	t-tstunt-parsechangelog
	t-tstunt dpkg-deb

	t-prep-newpackage example 1.0

	cd $p

	git checkout -b bad-build-deps indep-arch
	perl -pe 's/Build-Depends.*/$&, x-dgit-no-such-package/' \
		-i debian/control
	git commit -a -m bad-build-deps

	bm-prep-ownpackage-branches 'indep-arch bad-build-deps'

	if zgrep 'dpkg-buildpackage: Make dependency checks fatal for -S' \
		/usr/share/doc/dpkg-dev/changelog.gz; then
			dpkgbuildpackage_deps_for_clean=true
	else
			dpkgbuildpackage_deps_for_clean=false
	fi

	cleanmodes_default="git none"
	cleanmodes_default+=" dpkg-source$cleanmodes_dpkgsource_extra"
	cleanmodes_default+=" dpkg-source-d$cleanmodes_dpkgsource_extra"
	cleanmodes_all="$cleanmodes_default git-ff check"
	cleanmodes_all+=" git,always git,always"
	cleanmodes="$cleanmodes_default"
}

bm-gbp-example-acts () {
	t-gbp-example-prep
	t-tstunt-parsechangelog

	git checkout -b for-build-modes qc/quilt-tip-2
	# build-modes cannot cope with branches containing /

	bm-prep-ownpackage-branches for-build-modes

	cleanmodes='git dpkg-source,no-check'

	for act in "$@"; do
		bm-guess-e-source-e-targets "$act"
		real_act="--quilt=gbp $act"
		case "$act" in
		sbuild*)    bm_quirk_after_act=bm-quirk-sbuild-after-act ;;
		gbp-*)	    real_act="$real_act --git-ignore-branch" ;;
		*)	    bm_quirk_after_act='' ;;
		esac
		bm-act-iterate
	done
}

bm-guess-e-source-e-targets () {
	local some_act=$1
	case "$some_act" in
	sbuild*" --no-arch-all"*)
		e_source=true;	e_targets='build-arch binary-arch'	;;
	build-source)
		e_source=true;	e_targets=''				;;
	*" -b")	e_source=false;	e_targets='build binary'		;;
	*" -B")	e_source=false;	e_targets='build-arch binary-arch'	;;
	*" -A")	e_source=false;	e_targets='build-indep binary-indep'	;;
	*" -S")	e_source=true;	e_targets=' '				;;
	*" -F")	e_source=true;	e_targets='build binary'		;;
	*" -G")	e_source=true;	e_targets='build-arch binary-arch'	;;
	*" -g")	e_source=true;	e_targets='build-indep binary-indep'	;;
	*)	e_source=true;	e_targets='build binary'		;;
	esac
}

bm-quirk-sbuild-after-act () {
	# sbuild likes to run the package clean target in the chroot,
	# which isn't necessary in our case.  We don't disable it in
	# dgit because we want to do what sbuild does, in case there
	# are packages which don't build unless their clean target was
	# run.  We know it must be running it in the chroot because we
	# provide sbuild with the dsc, not the tree, so we simply
	# ignore all executions of the clean target by schroot.
	local arch; arch=$(dpkg-architecture -qDEB_BUILD_ARCH)
	local sblog=$bpd/example_${v}_$arch.build
	if [ -e $sblog ]; then
		sed '
			s/^EXAMPLE RULES TARGET clean/HOOK SUPPRESSED &/;
		' <$sblog >>$bmlog
	else
		echo "SBUILD LOG FILE ($sblog) MISSING"
	fi
}

bm-report-test () {
	local desc=$1; shift
	if "$@"; then
		echo >&4 "$desc EXISTS"
	else
		echo >&4 "$desc MISSING"
	fi
}

bm-build-deps-ok () {
	case "$branch" in
	*bad-build-deps*)	return 1	;;
	*)			return 0	;;
	esac
}

bm-compute-expected () {
	require_fail=unexpect # or required
	tolerate_fail=unexpect # or tolerate

	exec 4>$bmexp
	echo >&4 "$heading"

	local eff_cleanmode=$cleanmode

	case "$e_targets" in
	*[^\ ]*)
		;;
	*)
		# if no build is going to be run, dgit will only check
		# cleanliness rather than actually cleaning
		eff_cleanmode=C$cleanmode
		;;
	esac

	case "$act" in
	sbuild*)
		# dgit sbuild will only check cleanliness
		# because it doesn't need to to make a .dsc for sbuild
		eff_cleanmode=C$cleanmode
		;;
	esac

	# we are running the builder in-tree ?
	# when we have --include-dirty, we will want to check
	# that too and reset eff_cleanmode to $cleanmode

	case $eff_cleanmode in
	git|Cgit,always)
			echo >&4 'BUILD-MODES PROGRAM git clean -xdf' ;;
	git-ff|Cgit-ff,always)
			echo >&4 'BUILD-MODES PROGRAM git clean -xdff' ;;
	check|Ccheck)	echo >&4 'BUILD-MODES PROGRAM git clean -dn -x' ;;
	dpkg-source-d|dpkg-source-d,no-check)
			echo >&4 "EXAMPLE RULES TARGET clean"
			;;
	dpkg-source|dpkg-source,no-check)
			bm-build-deps-ok || tolerate_fail=tolerate
			echo >&4 "EXAMPLE RULES TARGET clean"
			;;
	none|Cnone)	;;
	Cdpkg-source*)	;; # handled below
	Cgit|Cgit-ff)	echo >&4 'BUILD-MODES PROGRAM git clean -dn' ;;
	*)		fail "t-compute-expected-run $cleanmode ??" ;;
	esac

	case $eff_cleanmode in
	dpkg-source|Cdpkg-source|dpkg-source-d|Cdpkg-source-d)
			echo >&4 'BUILD-MODES PROGRAM git clean -dn'
			;;
	dpkg-source*,no-check|Cdpkg-source*,no-check)
			;;
	Cdpkg-source*)	fail "t-compute-expected-run wd $cleanmode ??" ;;
	esac

	if [ "x$e_targets" != x ]; then
		# e_targets can be " " to mean `/may/ fail due to b-d'
		bm-build-deps-ok || tolerate_fail=tolerate
	fi

	for t in $e_targets; do
		bm-build-deps-ok || require_fail=required
		echo >&4 "EXAMPLE RULES TARGET $t"
	done

	bm-report-test "SOURCE FILE" $e_source
	bm-report-test "SOURCE IN CHANGES" $e_source
	bm-report-test "DEBS IN CHANGES" expr "$e_targets" : '.*binary.*'

	exec 4>&-
}

bm-run-one () {
	local args="$DGIT_TEST_BM_BASEARGS --clean=$cleanmode $real_act"

	bmid="$act,$cleanmode,$branch"
	bmid=${bmid// /_}

	rm -f $bpd/${p}_{v}_*.changes

	heading="===== [$bmid] dgit $args ====="

	bmlog=$tmp/run.$bmid.output
	bmexp=$tmp/run.$bmid.expected
	bmgot=$tmp/run.$bmid.results

	bm-compute-expected

	git checkout $branch
	git clean -xdf # since we might not do any actual cleaning

	dsc="$bpd/example_$v.dsc"
	rm -f $dsc

	set +o pipefail
	t-dgit --rm-old-changes --git=$tmp/stunt-git $args 2>&1 | tee $bmlog
	local ps="${PIPESTATUS[*]}"
	set -o pipefail

	$bm_quirk_after_act

	exec 4>$bmgot
	echo >&4 "$heading"

	case $ps in
	"0 0")	actual_status=success ;;
	*" 0")	actual_status=failure; echo >&4 "OPERATION FAILED"; ;;
	*)	fail "tee failed" ;;
	esac

	case "$require_fail-$tolerate_fail-$actual_status" in
	required-********-failure) echo >>$bmexp "REQUIRED FAILURE" ;;
	********-tolerate-failure) echo >>$bmexp "TOLERATED FAILURE" ;;
	unexpect-********-success) ;;
	*)	fail "RF=$require_fail TF=$tolerate_fail AS=$actual_status" ;;
	esac

	egrep >&4 '^EXAMPLE RULES TARGET|^BUILD-MODES' $bmlog || [ $? = 1 ]

	bm-report-test "SOURCE FILE" [ -e $dsc ]

	if [ $actual_status = success ]; then
		local changes; changes=$(echo $bpd/example_${v}_*.changes)
		case "$changes" in
		*' '*)	fail "build generated ambiguous .changes: $changes" ;;
		esac

		perl -ne 'print if m/^files:/i ... m/^\S/' \
			<$changes >$changes.files

		bm-report-test "SOURCE IN CHANGES" grep '\.dsc$' $changes.files
		bm-report-test "DEBS IN CHANGES" grep '\.deb$' $changes.files
	fi

	exec 4>&-

	$bm_quirk_before_diff

	[ $actual_status = failure ] || diff -U10 $bmexp $bmgot
}

bm-act-iterate () {
	for cleanmode in $cleanmodes; do
		for branch in $bm_branches; do
			bm-run-one
		done
	done
	: bm-act-iterate done.
}

bm-buildproductsdir-nonworking () {
	t-git-config dgit.default.build-products-dir ../bpd-dummy
}