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34 lines
911 B
Bash
Executable file
34 lines
911 B
Bash
Executable file
#! /bin/sh -e
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image=/tmp/disk.img
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size=$(expr 256 \* 1024 \* 1024)
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storepaths=/tmp/storepaths
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successors=/tmp/successors
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if ! test -f $image; then
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echo creating empty disk of $size bytes in $image...
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# Note: this is a sparse file.
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dd if=/dev/zero of=$image bs=1 seek=$(expr $size - 1) count=1
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echo creating disk image in $image...
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/sbin/mke2fs -F $image
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fi
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# What to copy?
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storeexpr=$(echo '(import ./pkgs.nix).init' | nix-instantiate -)
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nix-store -rB $storeexpr
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nix-store -qn --requisites $storeexpr > $storepaths
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(while read storepath; do
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nix-store -q --predecessors $storepath | (while read predecessor; do
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echo $predecessor $storepath
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done)
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done) < $storepaths > $successors
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# Fill the disk with the minimal Nix store.
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if ! test -d /tmp/mnt; then mkdir /tmp/mnt; fi
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linux ubd0=$image root=/dev/root rootflags=/ rootfstype=hostfs init="$(pwd)/fill-disk.sh $storeexpr"
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