20 lines
638 B
Bash
20 lines
638 B
Bash
source $stdenv/setup
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set -o pipefail
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# Get the paths in the closure of `packages'. Unfortunately, the only
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# way to get the closure is to call Nix, which is strictly speaking
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# forbidden. But we do it anyway. In time, we should add a feature
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# to Nix to let Nix pass closures to builders.
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packagesClosure=$(/nix/bin/nix-store -qR $packages $init)
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# Paths in cpio archives *must* be relative, otherwise the kernel
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# won't unpack 'em.
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mkdir root
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cd root
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cp -prd --parents $packagesClosure .
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# Put the closure in a gzipped cpio archive.
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ensureDir $out
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ln -s $init init
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find * -print0 | cpio -ov -H newc --null | gzip -9 > $out/initrd
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