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nixos/lib/make-disk-image: refactor to use nixos-install
- Replace hand-rolled version of nixos-install in make-disk-image by an
actual call to nixos-install
- Required a few cleanups of nixos-install
- nixos-install invokes an activation script which the hand-rolled version
in make-disk-image did not do. We remove /etc/machine-id as that's
a host-specific, impure, output of the activation script
Testing:
nix-build '<nixpkgs/nixos/release.nix>' -A tests.installer.simple passes
Also tried generating an image with:
nix-build -E 'let
pkgs = import <nixpkgs> {};
lib = pkgs.lib;
nixos = import <nixpkgs/nixos> {
configuration = {
fileSystems."/".device = "/dev/disk/by-label/nixos";
boot.loader.grub.devices = [ "/dev/sda" ];
boot.loader.grub.extraEntries = '"''"'
menuentry "Ubuntu" {
insmod ext2
search --set=root --label ubuntu
configfile /boot/grub/grub.cfg
}
'"''"';
};
};
in import <nixpkgs/nixos/lib/make-disk-image.nix> {
inherit pkgs lib;
config = nixos.config;
diskSize = 2000;
partitioned = false;
installBootLoader = false;
}'
Then installed the image:
$ sudo df if=./result/nixos.img of=/dev/sdaX bs=1M
$ sudo resize2fs /dev/disk/by-label/nixos
$ sudo mount /dev/disk/by-label/nixos /mnt
$ sudo mount --rbind /proc /mnt/proc
$ sudo mount --rbind /dev /mnt/dev
$ sudo chroot /mnt /nix/var/nix/profiles/system/bin/switch-to-configuration boot
[ … optionally do something about passwords … ]
and successfully rebooted to that image.
Was doing all this from inside a Ubuntu VM with a single user nix install.
This commit is contained in:
obadz
parent
4d1d37014a
commit
24f8cf08cc
@ -67,40 +67,24 @@ pkgs.vmTools.runInLinuxVM (
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mkdir /mnt
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mount $rootDisk /mnt
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# The initrd expects these directories to exist.
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mkdir /mnt/dev /mnt/proc /mnt/sys
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mount -o bind /proc /mnt/proc
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mount -o bind /dev /mnt/dev
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mount -o bind /sys /mnt/sys
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# Copy all paths in the closure to the filesystem.
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storePaths=$(perl ${pkgs.pathsFromGraph} /tmp/xchg/closure)
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mkdir -p /mnt/nix/store
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echo "copying everything (will take a while)..."
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set -f
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cp -prd $storePaths /mnt/nix/store/
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# Register the paths in the Nix database.
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printRegistration=1 perl ${pkgs.pathsFromGraph} /tmp/xchg/closure | \
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chroot /mnt ${config.nix.package.out}/bin/nix-store --load-db --option build-users-group ""
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${config.nix.package.out}/bin/nix-store --load-db --option build-users-group ""
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# Add missing size/hash fields to the database. FIXME:
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# exportReferencesGraph should provide these directly.
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chroot /mnt ${config.nix.package.out}/bin/nix-store --verify --check-contents
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${config.nix.package.out}/bin/nix-store --verify --check-contents --option build-users-group ""
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# Create the system profile to allow nixos-rebuild to work.
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chroot /mnt ${config.nix.package.out}/bin/nix-env --option build-users-group "" \
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-p /nix/var/nix/profiles/system --set ${config.system.build.toplevel}
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# In case the bootloader tries to write to /dev/sda…
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ln -s vda /dev/xvda
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ln -s vda /dev/sda
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# `nixos-rebuild' requires an /etc/NIXOS.
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mkdir -p /mnt/etc
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touch /mnt/etc/NIXOS
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# `switch-to-configuration' requires a /bin/sh
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mkdir -p /mnt/bin
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ln -s ${config.system.build.binsh}/bin/sh /mnt/bin/sh
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# Install the closure onto the image
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USER=root ${config.system.build.nixos-install}/bin/nixos-install \
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--closure ${config.system.build.toplevel} \
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--no-channel-copy \
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--no-root-passwd \
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${optionalString (!installBootLoader) "--no-bootloader"}
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# Install a configuration.nix.
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mkdir -p /mnt/etc/nixos
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@ -108,12 +92,9 @@ pkgs.vmTools.runInLinuxVM (
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cp ${configFile} /mnt/etc/nixos/configuration.nix
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''}
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# Generate the GRUB menu.
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ln -s vda /dev/xvda
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ln -s vda /dev/sda
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${optionalString installBootLoader "chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot"}
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# Remove /etc/machine-id so that each machine cloning this image will get its own id
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rm -f /mnt/etc/machine-id
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umount /mnt/proc /mnt/dev /mnt/sys
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umount /mnt
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# Do a fsck to make sure resize2fs works.
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@ -24,6 +24,7 @@ fi
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# Parse the command line for the -I flag
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extraBuildFlags=()
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chrootCommand=(/run/current-system/sw/bin/bash)
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buildUsersGroup="nixbld"
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while [ "$#" -gt 0 ]; do
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i="$1"; shift 1
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@ -42,6 +43,7 @@ while [ "$#" -gt 0 ]; do
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;;
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--closure)
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closure="$1"; shift 1
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buildUsersGroup=""
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;;
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--no-channel-copy)
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noChannelCopy=1
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@ -100,8 +102,8 @@ mount -t tmpfs -o "mode=0755" none $mountPoint/run
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mount -t tmpfs -o "mode=0755" none $mountPoint/var/setuid-wrappers
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rm -rf $mountPoint/var/run
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ln -s /run $mountPoint/var/run
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rm -f $mountPoint/etc/{resolv.conf,hosts}
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cp -Lf /etc/resolv.conf /etc/hosts $mountPoint/etc/
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for f in /etc/resolv.conf /etc/hosts; do rm -f $mountPoint/$f; [ -f "$f" ] && cp -Lf $f $mountPoint/etc/; done
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for f in /etc/passwd /etc/group; do touch $mountPoint/$f; [ -f "$f" ] && mount --rbind -o ro $f $mountPoint/$f; done
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cp -Lf "@cacert@" "$mountPoint/tmp/ca-cert.crt"
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export SSL_CERT_FILE=/tmp/ca-cert.crt
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@ -141,7 +143,7 @@ mkdir -m 0755 -p \
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$mountPoint/nix/var/log/nix/drvs
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mkdir -m 1775 -p $mountPoint/nix/store
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chown root:@nixbld_gid@ $mountPoint/nix/store
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chown @root_uid@:@nixbld_gid@ $mountPoint/nix/store
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# There is no daemon in the chroot.
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@ -155,7 +157,7 @@ export LC_TIME=
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# Builds will use users that are members of this group
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extraBuildFlags+=(--option "build-users-group" "nixbld")
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extraBuildFlags+=(--option "build-users-group" "$buildUsersGroup")
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# Inherit binary caches from the host
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@ -163,11 +165,6 @@ binary_caches="$(@perl@/bin/perl -I @nix@/lib/perl5/site_perl/*/* -e 'use Nix::C
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extraBuildFlags+=(--option "binary-caches" "$binary_caches")
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touch $mountPoint/etc/passwd $mountPoint/etc/group
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mount --bind -o ro /etc/passwd $mountPoint/etc/passwd
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mount --bind -o ro /etc/group $mountPoint/etc/group
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# Copy Nix to the Nix store on the target device, unless it's already there.
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if ! NIX_DB_DIR=$mountPoint/nix/var/nix/db nix-store --check-validity @nix@ 2> /dev/null; then
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echo "copying Nix to $mountPoint...."
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@ -246,7 +243,7 @@ ln -sfn /nix/var/nix/profiles/per-user/root/channels $mountPoint/root/.nix-defex
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# Get rid of the /etc bind mounts.
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umount $mountPoint/etc/passwd $mountPoint/etc/group
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for f in /etc/passwd /etc/group; do [ -f "$f" ] && umount $mountPoint/$f; done
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# Grub needs an mtab.
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@ -24,6 +24,7 @@ let
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inherit (pkgs) perl pathsFromGraph rsync;
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nix = config.nix.package.out;
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cacert = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
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root_uid = config.ids.uids.root;
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nixbld_gid = config.ids.gids.nixbld;
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nixClosure = pkgs.runCommand "closure"
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