file-mirror-automount hook now supports modes that cannot mount (like fakechroot) by copying the repo into the chroot

coverage.txt

@@ -127,6 +127,7 @@ Test: file-mirror
 Needs-QEMU: true
 
 Test: file-mirror-automount-hook
+Modes: root unshare fakechroot
 Needs-QEMU: true
 
 Test: mirror-is-deb

hooks/file-mirror-automount/customize00.sh

@@ -14,13 +14,26 @@ fi
 
 xargsopts="--null --no-run-if-empty -I {} --max-args=1"
 
-echo "unmounting the following mountpoints:" >&2
+case $MMDEBSTRAP_MODE in
+	root|unshare)
+		echo "unmounting the following mountpoints:" >&2 ;;
+	*)
+		echo "removing the following directories:" >&2 ;;
+esac
 
 cat "$rootdir/run/mmdebstrap/file-mirror-automount" \
 	| xargs $xargsopts echo "    $rootdir/{}"
 
+case $MMDEBSTRAP_MODE in
+	root|unshare)
 		cat "$rootdir/run/mmdebstrap/file-mirror-automount" \
 			| xargs $xargsopts umount "$rootdir/{}"
+		;;
+	*)
+		cat "$rootdir/run/mmdebstrap/file-mirror-automount" \
+			| xargs $xargsopts rm -r "$rootdir/{}"
+		;;
+esac
 
 rm "$rootdir/run/mmdebstrap/file-mirror-automount"
 rmdir --ignore-fail-on-non-empty "$rootdir/run/mmdebstrap"

hooks/file-mirror-automount/setup00.sh

@@ -12,9 +12,18 @@ env APT_CONFIG=$MMDEBSTRAP_APT_CONFIG apt-get indextargets --no-release-info \
 	| sed -ne 's/^Repo-URI: file:\/\+//p' \
 	| sort -u \
 	| while read path; do
-		echo "bind-mounting /$path into the chroot" >&2
 		mkdir -p "$rootdir/run/mmdebstrap"
+		case $MMDEBSTRAP_MODE in
+			root|unshare)
+				echo "bind-mounting /$path into the chroot" >&2
 				mkdir -p "$rootdir/$path"
 				mount -o ro,bind "/$path" "$rootdir/$path"
+				;;
+			*)
+				echo "copying /$path into the chroot" >&2
+				mkdir -p "$rootdir/$(dirname $path)"
+				cp -av "/$path" "$rootdir/$(dirname $path)"
+				;;
+		esac
 		printf '/%s\0' "$path" >> "$rootdir/run/mmdebstrap/file-mirror-automount"
 	done

tests/file-mirror-automount-hook

@@ -5,6 +5,16 @@ if [ ! -e /mmdebstrap-testenv ]; then
 	echo "this test requires the cache directory to be mounted on /mnt and should only be run inside a container" >&2
 	exit 1
 fi
-{{ CMD }} --mode={{ MODE }} --variant=apt --hook-dir=./hooks/file-mirror-automount --customize-hook='rmdir "$1"/mnt/cache/debian/ "$1"/mnt/cache' {{ DIST }} /tmp/debian-chroot.tar "deb file:///mnt/cache/debian {{ DIST }} main"
+if [ "$(id -u)" -eq 0 ] && ! id -u user > /dev/null 2>&1; then
+	adduser --gecos user --disabled-password user
+fi
+prefix=
+[ "$(id -u)" -eq 0 ] && [ "{{ MODE }}" != "root" ] && prefix="runuser -u user --"
+[ "{{ MODE }}" = "fakechroot" ] && prefix="$prefix fakechroot fakeroot"
+$prefix {{ CMD }} --mode={{ MODE }} --variant=apt \
+	--hook-dir=./hooks/file-mirror-automount \
+	--customize-hook='[ ! -e "$1"/mnt/cache/debian/ ] || rmdir "$1"/mnt/cache/debian/' \
+	--customize-hook='rmdir "$1"/mnt/cache' \
+	{{ DIST }} /tmp/debian-chroot.tar "deb file:///mnt/cache/debian {{ DIST }} main"
 tar -tf /tmp/debian-chroot.tar | sort | diff -u tar1.txt -
 rm /tmp/debian-chroot.tar