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Use partitioned qemu image for vmVariantWithDisko #1215

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Use partitioned qemu image for vmVariantWithDisko #1215

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22 changes: 15 additions & 7 deletions lib/interactive-vm.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -72,16 +72,24 @@ in
boot.zfs.forceImportAll = true;
boot.zfs.forceImportRoot = lib.mkForce true;

system.build.vmWithDisko = hostPkgs.writers.writeDashBin "disko-vm" ''
system.build.vmWithDisko = let
imageName = assert lib.assertMsg ((builtins.length disks) == 1)
"vmWithDisko only supports a single disk.";
(builtins.elemAt disks 0).imageName;
backingImage =
"${config.system.build.diskoImages}/${lib.escapeShellArg imageName}.qcow2";
qemuImage = "$tmp/${lib.escapeShellArg imageName}.qcow2";
in
hostPkgs.writers.writeDashBin "disko-vm" ''
set -efux
export tmp=$(${hostPkgs.coreutils}/bin/mktemp -d)
trap 'rm -rf "$tmp"' EXIT
${lib.concatMapStringsSep "\n" (disk: ''
${hostPkgs.qemu}/bin/qemu-img create -f qcow2 \
-b ${config.system.build.diskoImages}/${lib.escapeShellArg disk.imageName}.qcow2 \
-F qcow2 "$tmp"/${lib.escapeShellArg disk.imageName}.qcow2
'') disks}
trap 'rm -rf "$tmp"' EXIT
${hostPkgs.qemu}/bin/qemu-img create -f qcow2 \
-b ${backingImage} \
-F qcow2 ${qemuImage}

set +f
export NIX_DISK_IMAGE=${qemuImage}
${config.system.build.vm}/bin/run-*-vm "$@"
'';
}
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