when creating a tarball in chrootless mode, use root ownership

coverage.sh

@@ -48,7 +48,7 @@ if [ ! -e shared/mmdebstrap ] || [ mmdebstrap -nt shared/mmdebstrap ]; then
 fi
 
 starttime=
-total=92
+total=93
 i=1
 
 print_header() {
@@ -1113,6 +1113,11 @@ export LC_ALL=C.UTF-8
 prefix=
 [ "\$(id -u)" -eq 0 ] && prefix="runuser -u user --"
 \$prefix $CMD --mode=chrootless --variant=custom --include=doc-debian $DEFAULT_DIST /tmp/debian-chroot $mirror
+# preserve output with permissions and timestamps for later test
+chmod 700 /tmp/debian-chroot
+tar -C /tmp/debian-chroot --owner=0 --group=0 --numeric-owner --sort=name --clamp-mtime --mtime=$(date --utc --date=@$SOURCE_DATE_EPOCH --iso-8601=seconds) -cf /tmp/debian-chroot.tar .
+tar tvf /tmp/debian-chroot.tar > doc-debian.tar.list
+rm /tmp/debian-chroot.tar
 # delete contents of doc-debian
 rm /tmp/debian-chroot/usr/share/doc-base/debian-*
 rm -r /tmp/debian-chroot/usr/share/doc/debian
@@ -1154,6 +1159,25 @@ else
 	./run_null.sh
 fi
 
+print_header "mode=chrootless,variant=custom: install doc-debian and output tarball"
+cat << END > shared/test.sh
+#!/bin/sh
+set -eu
+export LC_ALL=C.UTF-8
+export SOURCE_DATE_EPOCH=$SOURCE_DATE_EPOCH
+[ "\$(id -u)" -eq 0 ] && ! id -u user > /dev/null 2>&1 && adduser --gecos user --disabled-password user
+prefix=
+[ "\$(id -u)" -eq 0 ] && prefix="runuser -u user --"
+\$prefix $CMD --mode=chrootless --variant=custom --include=doc-debian $DEFAULT_DIST /tmp/debian-chroot.tar $mirror
+tar tvf /tmp/debian-chroot.tar | grep -v ' ./dev' | diff -u doc-debian.tar.list -
+rm /tmp/debian-chroot.tar
+END
+if [ "$HAVE_QEMU" = "yes" ]; then
+	./run_qemu.sh
+else
+	./run_null.sh
+fi
+
 print_header "mode=chrootless,variant=custom: install libmagic-mgc on armhf"
 cat << END > shared/test.sh
 #!/bin/sh
@@ -1335,4 +1359,4 @@ if [ -e shared/cover_db/runs ]; then
 	echo
 fi
 
-rm shared/tar1.txt shared/tar2.txt shared/pkglist.txt
+rm shared/tar1.txt shared/tar2.txt shared/pkglist.txt doc-debian.tar.list

mmdebstrap

@@ -2295,7 +2295,15 @@ sub main() {
 		    }
 		    0 == system('proot', '--root-id', "--rootfs=$options->{root}", '--cwd=/', @qemuopt, 'tar', @taropts, '-C', '/', '.') or error "tar failed: $?";
 		} elsif (any { $_ eq $options->{mode} } ('root', 'chrootless')) {
-		    0 == system('tar', @taropts, '-C', $options->{root}, '.') or error "tar failed: $?";
+		    # If the chroot directory is not owned by the root user,
+		    # then we assume that no measure was taken to fake root
+		    # permissions. Since the final tarball should contain
+		    # entries with root ownership, we instruct tar to do so.
+		    my @owneropts = ();
+		    if ((stat $options->{root})[4] != 0) {
+			push @owneropts, '--owner=0', '--group=0', '--numeric-owner';
+		    }
+		    0 == system('tar', @taropts, @owneropts, '-C', $options->{root}, '.') or error "tar failed: $?";
 		} else {
 		    error "unknown mode: $options->{mode}";
 		}
@@ -2758,7 +2766,8 @@ Uses the dpkg option C<--force-script-chrootless> to install packages into
 B<TARGET> without dpkg and apt inside B<target> but using apt and dpkg from
 the machine running B<mmdebstrap>. Maintainer scripts are run without chrooting
 into B<TARGET> and rely on their dependencies being installed on the machine
-running B<mmdebstrap>.
+running B<mmdebstrap>. Unless B<mmdebstrap> was run inside fakeroot, the
+directory created will be owned by the user running mmdebstrap.
 
 =for TODO
 =item B<qemu>