49 lines
No EOL
2 KiB
Nix
49 lines
No EOL
2 KiB
Nix
# wrapper function around virt-customize to create custom OS image from an original OS image
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{ pkgs, lib, ... }:
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originalImage: {
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name,
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hostname ? "",
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nameToHostname ? true,
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diskSize ? "",
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smp ? 2,
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memSize ? 1024,
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install ? [],
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run ? "",
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commands ? "",
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osType ? "linux"
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}:
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let
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originalImageName = lib.strings.removeSuffix "-vmix" (lib.strings.removeSuffix ".qcow2" originalImage.name);
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resultImg = "./disk.qcow2";
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qemuWrapperScript = (pkgs.writeShellScript "qemu-wrapper-script" ''
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export PATH="${pkgs.qemu}/bin:$PATH"
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exec qemu-kvm -nic user,model=virtio-net-pci "$@"
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'');
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setHostname = if hostname != "" then hostname else if nameToHostname then name else "";
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virtCustomizeArgsHostname = if setHostname != "" then "--hostname '${setHostname}'" else "";
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virtCustomizeArgsInstall = if install != [] then "--install '${lib.strings.concatStringsSep "," install }'" else "";
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virtCustomizeArgsCommandsFile = if commands != "" then ("--commands-from-file " + pkgs.writeText "${name}-vmix-virt-customize-commands-file" commands) else "";
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virtCustomizeArgsRun = if run != "" then ("--run " + pkgs.writeScript "${name}-vmix-virt-customize-run-script" "${run}") else "";
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in
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pkgs.runCommand "${name}-${originalImageName}-vmix.qcow2" { __noChroot = true; } ''
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export PATH="${pkgs.qemu}/bin:${pkgs.curl}/bin:$PATH"
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# create resulting image backed by original image
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qemu-img create -f qcow2 -b ${originalImage} -F qcow2 ${resultImg}
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[ -n "${diskSize}" ] && qemu-img resize ${resultImg} ${diskSize}
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# run script inside image using virt-customize
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export LIBGUESTFS_APPEND="ipv6.disable=1"
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#export LIBGUESTFS_HV="${qemuWrapperScript}"
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${pkgs.guestfs-tools}/bin/virt-customize \
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-a ${resultImg} \
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--smp ${builtins.toString smp} \
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--memsize ${builtins.toString memSize} \
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${virtCustomizeArgsHostname} \
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${virtCustomizeArgsInstall} \
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${virtCustomizeArgsCommandsFile} \
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${virtCustomizeArgsRun}
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mv ${resultImg} $out
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'' |