abuild: set GIT_CEILING_DIRECTORIES before running prepare/build/check/package

abuild.in

@@ -674,6 +674,8 @@ runpart() {
 	if [ -d "$builddir" ]; then
 		case "$part" in
 			prepare|build|package|check)
+				# exclude aports from git repo discovery
+				export GIT_CEILING_DIRECTORIES="$startdir"
 				cd "$builddir";;
 		esac
 	fi

tests/abuild_test

@@ -21,7 +21,8 @@ init_tests \
 	abuild_invalid_pkgnames \
 	abuild_invalid_subpkgnames \
 	abuild_invalid_subpkg_version \
-	abuild_multiline_license
+	abuild_multiline_license \
+	abuild_git_ceiling
 
 export ABUILD_SHAREDIR=$(atf_get_srcdir)/..
 export ABUILD_CONF=/dev/null
@@ -412,3 +413,33 @@ abuild_multiline_license_body() {
 	atf_check -o match:'^license = MIT AND GPL-3.0-only OR GPL-3.0-or-later AND BSD-Clause-4$' \
 		cat pkg/.control.test-licenses/.PKGINFO
 }
+
+abuild_git_ceiling_body() {
+	init_keys
+	git init
+	mkdir git-pkg
+	cd git-pkg
+	cat >APKBUILD<<-EOF
+		# Maintainer: Joe User <juser@example.com>
+		pkgname="git-pkg"
+		pkgver="1.0"
+		pkgrel=0
+		pkgdesc="Dummy test package"
+		url="https://gitlab.alpinelinux.org/alpine/aports"
+		arch="noarch"
+		license="MIT"
+		prepare() {
+			mkdir -p "\$builddir"
+		}
+		build() {
+			git status
+		}
+		package() {
+			mkdir -p "\$pkgdir"
+		}
+	EOF
+	atf_check -s exit:1 \
+		-e match:"not a git repository" \
+		-e match:"ERROR: git-pkg: build failed" \
+		abuild
+}