164 lines
4.5 KiB
Bash
164 lines
4.5 KiB
Bash
#! @shell@
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# Syntax: installer.sh <DEVICE> <NIX-EXPR>
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# (e.g., installer.sh /mnt/root ./my-machine.nix)
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# - mount target device
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# - make Nix store etc.
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# - copy closure of rescue env to target device
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# - register validity
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# - start the "target" installer in a chroot to the target device
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# * do a nix-pull
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# * nix-env -p system-profile -i <nix-expr for the configuration>
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# * run hook scripts provided by packages in the configuration?
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# - install/update grub
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set -e
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mountPoint="$1"
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nixosDir="$2"
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configuration="$3"
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if test -z "$mountPoint" -o -z "$nixosDir" -o -z "$configuration"; then
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echo "Syntax: installer.sh <targetRootDir> <nixosDir> <configuration>"
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exit 1
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fi
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if ! test -e "$mountPoint"; then
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echo "mount point $mountPoint doesn't exist"
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exit 1
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fi
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if ! test -e "$nixosDir"; then
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echo "NixOS source directory $nixosDir doesn't exist"
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exit 1
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fi
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if ! test -e "$configuration"; then
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echo "configuration file $configuration doesn't exist"
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exit 1
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fi
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nixosDir=$(readlink -f "$nixosDir")
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configuration=$(readlink -f "$configuration")
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# Mount some stuff in the target root directory.
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mkdir -m 0755 -p $mountPoint/dev $mountPoint/proc $mountPoint/sys $mountPoint/mnt
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mount --rbind / $mountPoint/mnt
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mount --bind /dev $mountPoint/dev
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mount --bind /proc $mountPoint/proc
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mount --bind /sys $mountPoint/sys
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cleanup() {
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# !!! don't umount any we didn't mount ourselves
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for i in $(grep -F "$mountPoint" /proc/mounts \
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| perl -e 'while (<>) { /^\S+\s+(\S+)\s+/; print "$1\n"; }' \
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| sort -r);
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do
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umount $i
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done
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}
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trap "cleanup" EXIT
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mkdir -m 01777 -p $mountPoint/tmp
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mkdir -m 0755 -p $mountPoint/var
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# Create the necessary Nix directories on the target device, if they
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# don't already exist.
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mkdir -m 0755 -p \
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$mountPoint/nix/var/nix/gcroots \
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$mountPoint/nix/var/nix/temproots \
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$mountPoint/nix/var/nix/manifests \
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$mountPoint/nix/var/nix/userpool \
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$mountPoint/nix/var/nix/profiles \
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$mountPoint/nix/var/nix/db \
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$mountPoint/nix/var/log/nix/drvs
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mkdir -m 1777 -p \
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$mountPoint/nix/store \
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# Get the store paths to copy from the references graph.
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storePaths=$(@shell@ @pathsFromGraph@ @nixClosure@)
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# Copy Nix to the Nix store on the target device.
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echo "copying Nix to $mountPoint...."
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for i in $storePaths; do
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echo " $i"
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rsync -a $i $mountPoint/nix/store/
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done
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# Register the paths in the Nix closure as valid. This is necessary
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# to prevent them from being deleted the first time we install
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# something. (I.e., Nix will see that, e.g., the glibc path is not
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# valid, delete it to get it out of the way, but as a result nothing
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# will work anymore.)
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chroot $mountPoint @nix@/bin/nix-store --register-validity < @nixClosure@
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# Create the required /bin/sh symlink; otherwise lots of things
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# (notably the system() function) won't work.
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mkdir -m 0755 -p $mountPoint/bin
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# !!! assuming that @shell@ is in the closure
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ln -sf @shell@ $mountPoint/bin/sh
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# Enable networking in the chroot.
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mkdir -m 0755 -p $mountPoint/etc
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cp /etc/resolv.conf $mountPoint/etc/
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# Do a nix-pull to speed up building.
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if test -n "@nixpkgsURL@"; then
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chroot $mountPoint @nix@/bin/nix-pull @nixpkgsURL@/MANIFEST
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fi
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# Build the specified Nix expression in the target store and install
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# it into the system configuration profile.
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#rm -rf $mountPoint/scratch
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#mkdir $mountPoint/scratch
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#curl $nixpkgsURL/nixexprs.tar.bz2 | tar xj -C $mountPoint/scratch
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#nixpkgsName=$(cd $mountPoint/scratch && ls)
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chroot $mountPoint @nix@/bin/nix-env \
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-p /nix/var/nix/profiles/system \
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-f "/mnt$nixosDir/system/system.nix" \
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--arg configuration "import /mnt$configuration" \
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--set -A system
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# Copy the configuration to /etc/nixos.
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targetConfig=$mountPoint/etc/nixos/configuration.nix
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mkdir -p $(dirname $targetConfig)
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if test -e $targetConfig -o -L $targetConfig; then
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cp -f $targetConfig $targetConfig.backup-$(date "+%Y%m%d%H%M%S")
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fi
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if test "$configuration" != "$targetConfig"; then
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cp -f $configuration $targetConfig
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fi
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# Grub needs a mtab.
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rootDevice=$(df $mountPoint | grep '^/' | sed 's^ .*^^')
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echo "$rootDevice / somefs rw 0 0" > $mountPoint/etc/mtab
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# Mark the target as a NixOS installation, otherwise
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# switch-to-configuration will chicken out.
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touch $mountPoint/etc/NIXOS
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# Switch to the new system configuration. This will install Grub with
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# a menu default pointing at the kernel/initrd/etc of the new
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# configuration.
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echo "finalising the installation..."
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NIXOS_INSTALL_GRUB=1 chroot $mountPoint \
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/nix/var/nix/profiles/system/bin/switch-to-configuration boot
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