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30 lines
660 B
Nix
30 lines
660 B
Nix
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{ e2fsprogs
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, pkgsStatic
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, runCommand
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, util-linux
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, writeShellScript
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}:
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let
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init-sh = builtins.toFile "init.sh" ''
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#!/bin/sh
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mount none -t proc /proc
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mount none -t sysfs /sys
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mount none -t tmpfs /tmp
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mount none -t tmpfs /run
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exec sh
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'';
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mkroot = writeShellScript "mkroot" ''
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mkdir -p rootfs/{dev,proc,run,sys,tmp}
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install -Dm 755 ${init-sh} rootfs/sbin/init
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install -Dm 755 ${pkgsStatic.busybox}/bin/busybox rootfs/bin/busybox
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chroot rootfs /bin/busybox --install -s /bin
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${e2fsprogs.bin}/bin/mkfs.ext4 -d rootfs $out 32M
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'';
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in
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runCommand "rootfs.img" { } ''
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${util-linux}/bin/unshare -r ${mkroot}
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''
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