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#!/bin/bash
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_filesystem=debian-live-8.4.0-amd64-standard.layer.snapshot.2016-04-22.222941.btrfs
die() { printf '%s\n' "$*"; exit 1; }
set -ex
cp --reflink "$indev" "$outdev"~
time xorriso \
-drive_class clear_list all \
-outdev "$outdev"~ -indev "$outdev"~ \
-report_about mishap \
-volid "$volid" \
-return_with sorry 0 \
-pathspecs on -overwrite on \
-add_plainly any \
"${btrfs_layer_iso_path}=${btrfs_layer_filesystem}"
mv -f "$outdev"~ "$outdev"
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