From d96e85fddd90b121a5fbdf6649fba8076e2d9acd Mon Sep 17 00:00:00 2001
From: Johannes Schauer Marin Rodrigues <josch@mister-muffin.de>
Date: Sun, 29 May 2022 09:31:12 +0200
Subject: [PATCH] file-mirror-automount hook now supports modes that cannot
 mount (like fakechroot) by copying the repo into the chroot

---
 coverage.txt                               |  1 +
 hooks/file-mirror-automount/customize00.sh | 19 ++++++++++++++++---
 hooks/file-mirror-automount/setup00.sh     | 15 ++++++++++++---
 tests/file-mirror-automount-hook           | 12 +++++++++++-
 4 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/coverage.txt b/coverage.txt
index 9ff7aa7..db0c2c4 100644
--- a/coverage.txt
+++ b/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
diff --git a/hooks/file-mirror-automount/customize00.sh b/hooks/file-mirror-automount/customize00.sh
index 8b181f8..f0432ef 100755
--- a/hooks/file-mirror-automount/customize00.sh
+++ b/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/{}"
 
-cat "$rootdir/run/mmdebstrap/file-mirror-automount" \
-	| xargs $xargsopts umount "$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"
diff --git a/hooks/file-mirror-automount/setup00.sh b/hooks/file-mirror-automount/setup00.sh
index c1a3c96..6cee5d1 100755
--- a/hooks/file-mirror-automount/setup00.sh
+++ b/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 "$rootdir/run/mmdebstrap"
-		mkdir -p "$rootdir/$path"
-		mount -o ro,bind "/$path" "$rootdir/$path"
+		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
diff --git a/tests/file-mirror-automount-hook b/tests/file-mirror-automount-hook
index 24e3caa..d965711 100644
--- a/tests/file-mirror-automount-hook
+++ b/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