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21 lines
565 B
Text
21 lines
565 B
Text
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#!/bin/sh
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# オーバーレイイメージファイルの生成
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# Usage: bin/overlay-gen
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# Required: fallocate losetup mkfs.ext4 gzip
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cd -- "$(dirname -- "$0")/.."
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set -eux
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size=512m
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fallocate -l "${size}" overlay.img
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mkfs.ext4 overlay.img
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dev="$(losetup -f)"
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finally="losetup -d '${dev}'"
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trap 'sh -c "${finally}"' EXIT
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losetup "${dev}" overlay.img
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tmp="$(mktemp -d)"
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finally="rmdir '${tmp}'; ${finally}"
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mount "${dev}" "${tmp}"
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finally="umount '${tmp}'; ${finally}"
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mkdir -p "${tmp}/work/usr"
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mkdir -p "${tmp}/upper/usr"
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finally="${finally}; gzip -f overlay.img"
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