nixpkgs/make-disk.sh
2004-11-09 10:28:21 +00:00

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#! /bin/sh -e
image=/tmp/disk.img
size=$(expr 2048 \* 1024 \* 1024)
storePaths=/tmp/mystorepaths
successors=/tmp/mysuccessors
if ! test -f $image; then
echo creating empty disk of $size bytes in $image...
# Note: this is a sparse file.
dd if=/dev/zero of=$image bs=1 seek=$(expr $size - 1) count=1
echo creating disk image in $image...
/sbin/mke2fs -F $image
fi
# What to copy?
NIX_CMD_PATH=/nix/bin
storeExpr=$(echo '(import ./pkgs.nix).everything' | $NIX_CMD_PATH/nix-instantiate -)
$NIX_CMD_PATH/nix-store -rB $storeExpr
$NIX_CMD_PATH/nix-store -qn --requisites $storeExpr > $storePaths
(while read storepath; do
$NIX_CMD_PATH/nix-store -q --predecessors $storepath | (while read predecessor; do
echo $predecessor $storepath
done)
done) < $storePaths > $successors
# Location of sysvinit?
sysvinitPath=$($NIX_CMD_PATH/nix-store -qn $(echo '(import ./pkgs.nix).sysvinit' | $NIX_CMD_PATH/nix-instantiate -))
# Location of Nix boot scripts?
bootPath=$($NIX_CMD_PATH/nix-store -qn $(echo '(import ./pkgs.nix).boot' | $NIX_CMD_PATH/nix-instantiate -))
# Fill the disk with the minimal Nix store.
if ! test -d /tmp/mnt; then mkdir /tmp/mnt; fi
linux ubd0=$image root=/dev/root rootflags=/ rootfstype=hostfs \
init="$(pwd)/fill-disk.sh $sysvinitPath $bootPath"