1 files changed, 16 insertions, 3 deletions

diff --git a/xorriso-layer.sh b/xorriso-layer.sh
index b8f6ede..7ce4776 100755
--- a/xorriso-layer.sh
+++ b/xorriso-layer.sh
@@ -3,12 +3,24 @@
 outdev=debian-live-8.4.0-amd64-standard.btrfs.layered.iso
 indev=debian-live-8.4.0-amd64-standard.btrfs.iso
 volid=SamizdatLive
-btrfs_layer_iso_path=live/layer.btrfs
+btrfs_layer_iso_path=live/layer%s.btrfs
 btrfs_layer_filesystem="$1"
 
 die() { printf '%s\n' "$*"; exit 1; }
 
-[ -f "$btrfs_layer_filesystem" ] || die "Usage: $0 <layer.btrfs>"
+[ -f "$btrfs_layer_filesystem" ] || die "Usage: $0 <layer.btrfs> [layer2.btrfs ...]"
+
+i=0
+while [ $i -lt $# ]; do
+    arg=$1
+    [ $i -eq 0 ] && n='' || n=$((i + 1))
+    arg=$(printf "${btrfs_layer_iso_path}=%s" "$n" "$arg")
+    shift
+    set -- "$@" "$arg"
+    i=$((i + 1))
+done
+
+for arg; do echo "a=$arg"; done; exit;
 
 set -ex
 
@@ -21,5 +33,6 @@ time xorriso \
         -return_with sorry 0 \
         -pathspecs on -overwrite on \
         -add_plainly any \
-        "${btrfs_layer_iso_path}=${btrfs_layer_filesystem}"
+        "$@"
+
 mv -f "$outdev"~ "$outdev"