mirror of
https://github.com/0xbbjubjub/miniguest.git
synced 2024-09-11 05:55:35 +03:00
tool/create: take guest config into account
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parent
edace7d30c
commit
662f387446
@ -26,6 +26,7 @@ mkIf cfg.enable {
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mkdir -p $out/boot
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ln -sT ${config.system.build.toplevel}/init $out/boot/init
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cp ${closureInfo}/registration $out/boot/nix-path-registration
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ln -s ${pkgs.writeText "miniguest-config.json" (builtins.toJSON cfg)} $out/miniguest-config.json
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${lib.optionalString (cfg.guestType == "qemu")
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"cp -P ${config.system.build.toplevel}/{kernel,initrd} -t $out"
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}
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@ -17,6 +17,7 @@
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*/
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#include <filesystem>
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#include <nlohmann/json.hpp>
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#include <optional>
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namespace miniguest {
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@ -48,4 +49,26 @@ private:
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void completeGuestName(size_t, std::string_view prefix);
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enum class GuestType { qemu, lxc };
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NLOHMANN_JSON_SERIALIZE_ENUM(GuestType, {
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{GuestType::qemu, "qemu"},
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{GuestType::lxc, "lxc"},
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})
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enum class QemuFsType { _9p, virtiofs };
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NLOHMANN_JSON_SERIALIZE_ENUM(QemuFsType, {
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{QemuFsType::_9p, "9p"},
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{QemuFsType::virtiofs, "virtiofs"},
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})
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struct GuestConfig final {
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GuestType guest_type;
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QemuFsType qemu_fs_type;
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};
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inline void from_json(const nlohmann::json &j, GuestConfig &cfg) {
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j.at("guestType").get_to(cfg.guest_type);
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j.at("qemu").at("fsType").get_to(cfg.qemu_fs_type);
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}
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} // namespace miniguest
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@ -49,6 +49,16 @@ struct CmdCreate : virtual EvalCommand, virtual MixProfile {
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-t, --hypervisor: hypervisor to configure. Can be one of: 'libvirt' and 'lxc' (default: 'libvirt'))"";
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}
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GuestConfig load_config() {
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auto path =
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fs::path("/etc/miniguests") / guest_name / "miniguest-config.json";
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try {
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return nlohmann::json::parse(readFile(path)).get<GuestConfig>();
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} catch (SysError &err) { logWarning(err.info()); }
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warn("metadata unavailable: falling back to defaults");
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return {};
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}
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void display_command(Strings cmd) const {
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std::cout << "# Create " << guest_name << " using:" << std::endl;
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for (auto &line : cmd)
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@ -56,24 +66,28 @@ struct CmdCreate : virtual EvalCommand, virtual MixProfile {
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std::cout << std::endl;
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}
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void display_command_libvirt() const {
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void display_command_libvirt(const GuestConfig &cfg) const {
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auto virtiofs = cfg.qemu_fs_type == QemuFsType::virtiofs;
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std::string memorybacking =
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virtiofs ? " --memorybacking=access.mode=shared" : "";
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std::string fsArgs =
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virtiofs ? "driver.type=virtiofs" : "readonly=yes,accessmode=squash";
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Strings cmd{
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"virt-install -n " + guest_name,
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"--connect qemu:///system",
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"--os-variant nixos-unstable",
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"--memory 1536",
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"--memory 1536" + memorybacking,
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"--disk none",
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"--import",
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"--boot kernel=/etc/miniguests/" + guest_name +
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"/kernel,initrd=/etc/miniguests/" + guest_name + "/initrd",
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"--filesystem /nix/store/,nix-store,readonly=yes,accessmode=squash",
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"--filesystem /etc/miniguests/" + guest_name +
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"/boot/,boot,readonly=yes,accessmode=squash",
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"--filesystem /nix/store/,nix-store," + fsArgs,
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"--filesystem /etc/miniguests/" + guest_name + "/boot/,boot," + fsArgs,
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};
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display_command(cmd);
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}
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void display_command_lxc() const {
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void display_command_lxc(const GuestConfig &cfg) const {
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Strings cmd = {
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"lxc-create " + guest_name,
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"-f extra-config",
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@ -89,7 +103,7 @@ struct CmdCreate : virtual EvalCommand, virtual MixProfile {
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}
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struct HypervisorData {
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void (CmdCreate::*display_commmand)() const;
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void (CmdCreate::*display_commmand)(const GuestConfig &cfg) const;
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};
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static const std::map<std::string, HypervisorData> hypervisors;
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@ -119,13 +133,15 @@ struct CmdCreate : virtual EvalCommand, virtual MixProfile {
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}
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void run(ref<Store> store) override {
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auto cfg = load_config();
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if (!hypervisor)
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hypervisor = "libvirt";
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hypervisor = cfg.guest_type == GuestType::lxc ? "lxc" : "libvirt";
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if (auto it = hypervisors.find(*hypervisor); it != hypervisors.end()) {
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(this->*it->second.display_commmand)();
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(this->*it->second.display_commmand)(cfg);
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} else
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throw Error(2, "unknown hypervisor type");
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throw Error(2, "unknown hypervisor type: " + *hypervisor);
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}
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virtual ~CmdCreate() = default;
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