feat(proxmoxve): initial commit

internal/providers/proxmoxve/proxmoxve.go

@@ -0,0 +1,130 @@
+// Copyright 2019 Red Hat, Inc.
+//
+// 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.
+
+// The OpenStack provider fetches configurations from the userdata available in
+// both the config-drive as well as the network metadata service. Whichever
+// responds first is the config that is used.
+// NOTE: This provider is still EXPERIMENTAL.
+
+package proxmoxve
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"time"
+
+	"github.com/coreos/ignition/v2/config/v3_5_experimental/types"
+	"github.com/coreos/ignition/v2/internal/distro"
+	"github.com/coreos/ignition/v2/internal/log"
+	"github.com/coreos/ignition/v2/internal/platform"
+	"github.com/coreos/ignition/v2/internal/providers/util"
+	"github.com/coreos/ignition/v2/internal/resource"
+	ut "github.com/coreos/ignition/v2/internal/util"
+
+	"github.com/coreos/vcontext/report"
+)
+
+const (
+	cidataPath  = "/user-data"
+	deviceLabel = "cidata"
+)
+
+func init() {
+	platform.Register(
+		platform.Provider{
+			Name:  "proxmoxve",
+			Fetch: fetchConfig,
+		},
+	)
+}
+
+func fetchConfig(f *resource.Fetcher) (types.Config, report.Report, error) {
+	var data []byte
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+
+	dispatch := func(name string, fn func() ([]byte, error)) {
+		raw, err := fn()
+		if err != nil {
+			switch err {
+			case context.Canceled:
+			case context.DeadlineExceeded:
+				f.Logger.Err("timed out while fetching config from %s", name)
+			default:
+				f.Logger.Err("failed to fetch config from %s: %v", name, err)
+			}
+			return
+		}
+
+		data = raw
+		cancel()
+	}
+
+	go dispatch(
+		"config drive (cidata)", func() ([]byte, error) {
+			return fetchConfigFromDevice(f.Logger, ctx, filepath.Join(distro.DiskByLabelDir(), deviceLabel))
+		},
+	)
+
+	<-ctx.Done()
+	if ctx.Err() == context.DeadlineExceeded {
+		f.Logger.Info("cidata drive was not available in time. Continuing without a config...")
+	}
+
+	return util.ParseConfig(f.Logger, data)
+}
+
+func fileExists(path string) bool {
+	_, err := os.Stat(path)
+	return (err == nil)
+}
+
+func fetchConfigFromDevice(logger *log.Logger, ctx context.Context, path string) ([]byte, error) {
+	for !fileExists(path) {
+		logger.Debug("config drive (%q) not found. Waiting...", path)
+		select {
+		case <-time.After(time.Second):
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		}
+	}
+
+	logger.Debug("creating temporary mount point")
+	mnt, err := os.MkdirTemp("", "ignition-configdrive")
+	if err != nil {
+		return nil, fmt.Errorf("failed to create temp directory: %v", err)
+	}
+	defer os.Remove(mnt)
+
+	cmd := exec.Command(distro.MountCmd(), "-o", "ro", "-t", "auto", path, mnt)
+	if _, err := logger.LogCmd(cmd, "mounting config drive"); err != nil {
+		return nil, err
+	}
+	defer func() {
+		_ = logger.LogOp(
+			func() error {
+				return ut.UmountPath(mnt)
+			},
+			"unmounting %q at %q", path, mnt,
+		)
+	}()
+
+	if !fileExists(filepath.Join(mnt, cidataPath)) {
+		return nil, nil
+	}
+
+	return os.ReadFile(filepath.Join(mnt, cidataPath))
+}