1 files changed, 54 insertions, 0 deletions
diff --git a/tests/pivot_root b/tests/pivot_root
new file mode 100644
index 0000000..860c41b
--- /dev/null
+++ b/tests/pivot_root
@@ -0,0 +1,54 @@
+#!/bin/sh
+set -eu
+export LC_ALL=C.UTF-8
+export SOURCE_DATE_EPOCH={{ SOURCE_DATE_EPOCH }}
+trap "rm -f /tmp/chroot1.tar /tmp/chroot2.tar /tmp/chroot3.tar /tmp/mmdebstrap" EXIT INT TERM
+
+prefix=
+if [ "$(id -u)" -eq 0 ] && [ "{{ MODE }}" != "root" ] && [ "{{ MODE }}" != "auto" ]; then
+	if ! id "${SUDO_USER:-user}" 2>/dev/null; then
+		if [ ! -e /mmdebstrap-testenv ]; then
+			echo "this test modifies the system and should only be run inside a container" >&2
+			exit 1
+		fi
+		useradd --home-dir "/home/${SUDO_USER:-user}" --create-home "${SUDO_USER:-user}"
+	fi
+	prefix="runuser -u ${SUDO_USER:-user} --"
+fi
+
+$prefix {{ CMD }} --mode={{ MODE }} --variant=apt \
+	--include=mount \
+	{{ DIST }} /tmp/chroot1.tar {{ MIRROR }}
+
+if [ {{ MODE }} = "unshare" ]; then
+	# calling pivot_root in root mode does not work for mysterious reasons:
+	# pivot_root: failed to change root from `.' to `mnt': Invalid argument
+	$prefix {{ CMD }} --mode={{ MODE }} --variant=apt --include=mount \
+		--customize-hook='mkdir -p "$1/mnt" "$1/oldroot"' \
+		--customize-hook='[ ! -e /usr/bin/mmdebstrap ] || cp -aT /usr/bin/mmdebstrap "$1/usr/bin/mmdebstrap"' \
+		--customize-hook='[ ! -e ./mmdebstrap ] || cp -aT ./mmdebstrap "$1/mnt/mmdebstrap"' \
+		--customize-hook='mount -o rbind "$1" /mnt && cd /mnt && /sbin/pivot_root . oldroot' \
+		--customize-hook='unshare -U echo nested unprivileged unshare' \
+		--customize-hook='env --chdir=/mnt {{ CMD }} --mode=unshare --variant=apt --include=mount {{ DIST }} /tmp/chroot3.tar {{ MIRROR }}' \
+		--customize-hook='copy-out /tmp/chroot3.tar /tmp' \
+		--customize-hook='rm -f "/usr/bin/mmdebstrap" "/mnt/mmdebstrap"' \
+		--customize-hook='umount -l oldroot sys' \
+		--customize-hook='rmdir /oldroot' \
+		{{ DIST }} /tmp/chroot2.tar {{ MIRROR }}
+
+		cmp /tmp/chroot1.tar /tmp/chroot2.tar || diffoscope /tmp/chroot1.tar /tmp/chroot2.tar
+		cmp /tmp/chroot1.tar /tmp/chroot3.tar || diffoscope /tmp/chroot1.tar /tmp/chroot3.tar
+		rm /tmp/chroot2.tar /tmp/chroot3.tar
+fi
+
+$prefix {{ CMD }} --mode={{ MODE }} --variant=apt --include=mount \
+	--customize-hook='mkdir -p "$1/mnt"' \
+	--customize-hook='[ ! -e /usr/bin/mmdebstrap ] || cp -aT /usr/bin/mmdebstrap "$1/usr/bin/mmdebstrap"' \
+	--customize-hook='[ ! -e ./mmdebstrap ] || cp -aT ./mmdebstrap "$1/mnt/mmdebstrap"' \
+	--chrooted-customize-hook='env --chdir=/mnt {{ CMD }} --mode=unshare --variant=apt --include=mount {{ DIST }} /tmp/chroot3.tar {{ MIRROR }}' \
+	--customize-hook='copy-out /tmp/chroot3.tar /tmp' \
+	--customize-hook='rm -f "$1/usr/bin/mmdebstrap" "$1/mnt/mmdebstrap"' \
+	{{ DIST }} /tmp/chroot2.tar {{ MIRROR }}
+
+cmp /tmp/chroot1.tar /tmp/chroot2.tar || diffoscope /tmp/chroot1.tar /tmp/chroot2.tar
+cmp /tmp/chroot1.tar /tmp/chroot3.tar || diffoscope /tmp/chroot1.tar /tmp/chroot3.tar