tests: split out creation of mmdebstrap chroot into its own test to avoid running the same thing multiple times and speed up tests

coverage.txt

@@ -56,8 +56,20 @@ Needs-Root: true
 Test: mount-is-missing
 Needs-QEMU: true
 
-Test: check-for-bit-by-bit-identical-format-output
+Test: mmdebstrap
 Needs-Root: true
+Modes: root
+Formats: tar squashfs ext2
+Variants: essential apt minbase buildd - standard
+Skip-If:
+ variant == "standard" and dist in ["oldstable", "stable"] # #864082, #1004557, #1004558
+ variant == "important" and dist == "oldstable" # /var/lib/systemd/catalog/database differs
+ fmt == "squashfs" and dist == "oldstable" # squashfs-tools-ng is not available
+ fmt == "ext2" and dist == "oldstable" # genext2fs does not support SOURCE_DATE_EPOCH
+ mode == "fakechroot" and variant in ["-", "standard"] # no extended attributes
+ variant == "standard" and hostarch in ["armel", "armhf", "mipsel"] # #1031276
+
+Test: check-for-bit-by-bit-identical-format-output
 Modes: unshare fakechroot
 Formats: tar squashfs ext2
 Variants: essential apt minbase buildd - standard

tests/check-for-bit-by-bit-identical-format-output

@@ -3,9 +3,7 @@ set -eu
 export LC_ALL=C.UTF-8
 export SOURCE_DATE_EPOCH={{ SOURCE_DATE_EPOCH }}
 
-trap "rm -f /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }} /tmp/debian-chroot-root.{{ FORMAT }}" EXIT INT TERM
-
-[ "$(id -u)" -eq 0 ]
+trap "rm -f /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }}" EXIT INT TERM
 
 if ! id "${SUDO_USER:-user}" >/dev/null 2>&1; then
 	if [ ! -e /mmdebstrap-testenv ]; then
@@ -14,23 +12,9 @@ if ! id "${SUDO_USER:-user}" >/dev/null 2>&1; then
 	fi
 	useradd --home-dir "/home/${SUDO_USER:-user}" --create-home "${SUDO_USER:-user}"
 fi
-prefix="runuser -u ${SUDO_USER:-user} --"
-
-{{ CMD }} --mode=root --variant={{ VARIANT }} {{ DIST }} /tmp/debian-chroot-root.{{ FORMAT }} {{ MIRROR }}
-if [ "{{ FORMAT }}" = tar ]; then
-	printf 'ustar ' | cmp --bytes=6 --ignore-initial=257:0 /tmp/debian-chroot-root.tar -
-elif [ "{{ FORMAT }}" = squashfs ]; then
-	printf 'hsqs' | cmp --bytes=4 /tmp/debian-chroot-root.squashfs -
-elif [ "{{ FORMAT }}" = ext2 ]; then
-	printf '\123\357' | cmp --bytes=2 --ignore-initial=1080:0 /tmp/debian-chroot-root.ext2 -
-else
-	echo "unknown format: {{ FORMAT }}" >&2
-	exit 1
-fi
-
-$prefix {{ CMD }} --mode={{ MODE }} --variant={{ VARIANT }} {{ DIST }} /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }} {{ MIRROR }}
-cmp /tmp/debian-chroot-root.{{ FORMAT }} /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }} \
-	|| diffoscope /tmp/debian-chroot-root.{{ FORMAT }} /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }}
+runuser -u "${SUDO_USER:-user}" -- {{ CMD }} --mode={{ MODE }} --variant={{ VARIANT }} {{ DIST }} /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }} {{ MIRROR }}
+cmp ./cache/mmdebstrap-{{ DIST }}-{{ VARIANT }}.{{ FORMAT }} /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }} \
+	|| diffoscope ./cache/mmdebstrap-{{ DIST }}-{{ VARIANT }}.{{ FORMAT }} /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }}
 
 # we cannot test chrootless mode here, because mmdebstrap relies on the
 # usrmerge package to set up merged-/usr and that doesn't work in chrootless

tests/mmdebstrap

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -eu
+export LC_ALL=C.UTF-8
+export SOURCE_DATE_EPOCH={{ SOURCE_DATE_EPOCH }}
+
+[ "$(id -u)" -eq 0 ]
+[ {{ MODE }} = "root" ]
+case {{ FORMAT }} in tar|squashfs|ext2) : ;; *) exit 1;; esac
+
+{{ CMD }} --mode={{ MODE }} --variant={{ VARIANT }} {{ DIST }} ./cache/mmdebstrap-{{ DIST }}-{{ VARIANT }}.{{ FORMAT }} {{ MIRROR }}
+if [ "{{ FORMAT }}" = tar ]; then
+	printf 'ustar ' | cmp --bytes=6 --ignore-initial=257:0 ./cache/mmdebstrap-{{ DIST }}-{{ VARIANT }}.tar -
+elif [ "{{ FORMAT }}" = squashfs ]; then
+	printf 'hsqs' | cmp --bytes=4 ./cache/mmdebstrap-{{ DIST }}-{{ VARIANT }}.squashfs -
+elif [ "{{ FORMAT }}" = ext2 ]; then
+	printf '\123\357' | cmp --bytes=2 --ignore-initial=1080:0 ./cache/mmdebstrap-{{ DIST }}-{{ VARIANT }}.ext2 -
+else
+	echo "unknown format: {{ FORMAT }}" >&2
+	exit 1
+fi