diff options
| -rw-r--r-- | nixos/lib/make-disk-image.nix | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/nixos/lib/make-disk-image.nix b/nixos/lib/make-disk-image.nix index db53bb98ee4e..e18c82a65bfe 100644 --- a/nixos/lib/make-disk-image.nix +++ b/nixos/lib/make-disk-image.nix @@ -162,6 +162,12 @@ To solve this, you can run `fdisk -l $image` and generate `dd if=$image of=$imag # `installBootLoader` and `configFile`. onlyNixStore ? false +, # Ensure that no "new" Nix store is written to the root of the image + # by symlinking the host Nix store. + # This saves a lot of disk space if you don't need an isolated Nix store. + # Incompatible with `additionalPaths` + noNixStore ? true + , name ? "nixos-disk-image" , # Disk image format, one of qcow2, qcow2-compressed, vdi, vpc, raw. @@ -198,8 +204,9 @@ assert (lib.assertMsg (fsType == "ext4" && deterministic -> rootFSUID != null) " # We use -E offset=X below, which is only supported by e2fsprogs assert (lib.assertMsg (partitionTableType != "none" -> fsType == "ext4") "to produce a partition table, we need to use -E offset flag which is support only for fsType = ext4"); assert (lib.assertMsg (touchEFIVars -> partitionTableType == "hybrid" || partitionTableType == "efi" || partitionTableType == "legacy+gpt") "EFI variables can be used only with a partition table of type: hybrid, efi or legacy+gpt."); - # If only Nix store image, then: contents must be empty, configFile must be unset, and we should no install bootloader. +# If only Nix store image, then: contents must be empty, configFile must be unset, and we should no install bootloader. assert (lib.assertMsg (onlyNixStore -> contents == [] && configFile == null && !installBootLoader) "In a only Nix store image, the contents must be empty, no configuration must be provided and no bootloader should be installed."); +assert (lib.assertMsg (noNixStore -> additionalPaths == []) "Without a Nix store in the rootfs, additional paths cannot be copied otherwise you would end up again with a Nix store."); # Either both or none of {user,group} need to be set assert (lib.assertMsg (lib.all (attrs: ((attrs.user or null) == null) @@ -422,6 +429,15 @@ let format' = format; in let export NIX_STATE_DIR=$TMPDIR/state nix-store --load-db < ${closureInfo}/registration + ${optionalString noNixStore '' + # Ensure host Nix store is available so that `nixos-install` performs + # no extra operations. + mkdir -p $root/nix + # TODO: this needs to be made persistent or you need to run the nixos-install inside the namespace. + # then, we need to unmount. + unshare --mount --map-root-user mount --rbind ${builtins.storeDir} $root/nix + ''} + chmod 755 "$TMPDIR" echo "running nixos-install..." nixos-install --root $root --no-bootloader --no-root-passwd \ |