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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| // Copyright 2023 Red Hat | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package applehv | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "net/http" | ||
| "os/exec" | ||
|
|
||
| "github.com/coreos/ignition/v2/config/v3_5_experimental/types" | ||
| "github.com/coreos/ignition/v2/internal/distro" | ||
| "github.com/coreos/ignition/v2/internal/platform" | ||
| "github.com/coreos/ignition/v2/internal/providers/util" | ||
| "github.com/coreos/ignition/v2/internal/resource" | ||
| "github.com/coreos/vcontext/report" | ||
| "github.com/mdlayher/vsock" | ||
| ) | ||
|
|
||
| /* | ||
| This provider is specific to virtual machines running under Apple Hypervisor on macOS on Apple hardware. | ||
| It should however be possible to emulate the platform setup with QEMU, using [1] to assign a vsock to the | ||
| guest and then forward the request from the Ignition process running in the virtual machine to an HTTP | ||
| server running on the host, using the vsock support in socat for example. | ||
| [1] https://wiki.qemu.org/Features/VirtioVsock | ||
| */ | ||
|
|
||
| func init() { | ||
| platform.Register(platform.Provider{ | ||
| Name: "applehv", | ||
| Fetch: fetchConfig, | ||
| }) | ||
| } | ||
|
|
||
| func fetchConfig(f *resource.Fetcher) (types.Config, report.Report, error) { | ||
| // the vsock module must be built into the kernel or loaded so we can communicate | ||
| // with the host | ||
| if _, err := f.Logger.LogCmd(exec.Command(distro.ModprobeCmd(), "vsock"), "Loading vsock kernel module"); err != nil { | ||
| f.Logger.Err("failed to install vsock kernel module: %v", err) | ||
| return types.Config{}, report.Report{}, fmt.Errorf("failed to install vsock kernel module: %v", err) | ||
| } | ||
|
|
||
| // we use a http GET over vsock to fetch the ignition file. the | ||
| // vsock connection itself is begun here. the "host" will need an HTTPD | ||
| // server listen on the the other end of the vsock connection on port 1024. The | ||
| // port is trivial and was just chosen by author | ||
| // ID =2 is shorthand for "the host" | ||
| // | ||
| conn, err := vsock.Dial(2, 1024, &vsock.Config{}) | ||
| if err != nil { | ||
| return types.Config{}, report.Report{}, err | ||
| } | ||
| defer func() { | ||
| if err := conn.Close(); err != nil { | ||
| f.Logger.Err("unable to close vsock connection: %v", err) | ||
| } | ||
| }() | ||
|
|
||
| // The host portion of the URL is arbitrary here. The schema is important however. Because | ||
| // this is more or less HTTP over a UDS, then the host name is discarded. | ||
| req, err := http.NewRequest(http.MethodGet, "http://d/", nil) | ||
| if err != nil { | ||
| return types.Config{}, report.Report{}, err | ||
| } | ||
| req.Header.Set("Accept", "application/json") | ||
|
|
||
| client := http.Client{ | ||
| Transport: &http.Transport{ | ||
| DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) { | ||
| return conn, nil | ||
| }, | ||
| }, | ||
| } | ||
|
|
||
| resp, err := client.Do(req) | ||
| if err != nil { | ||
| return types.Config{}, report.Report{}, err | ||
| } | ||
|
|
||
| defer func() { | ||
| if err := resp.Body.Close(); err != nil { | ||
| f.Logger.Err("unable to close response body: %v", err) | ||
| } | ||
| }() | ||
|
|
||
| b, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| return types.Config{}, report.Report{}, err | ||
| } | ||
|
|
||
| return util.ParseConfig(f.Logger, b) | ||
| } |
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