Virt-v2v: read LUKS keys

This patch will read the given LUKS key provided to the container and
add them as arguments to the virt-v2v command. Since virt-v2v supports
this feature only since 2.2, it applies only for cold migrations.
It uses the `all` selector to each passphrase.

Signed-off-by: Liran Rotenberg <[email protected]>

virt-v2v/cold/entrypoint.go

@@ -20,6 +20,7 @@ const (
 	FS      = "/mnt/disks/disk[0-9]*"
 	Block   = "/dev/block[0-9]*"
 	VDDK    = "/opt/vmware-vix-disklib-distrib"
+	LUKSDIR = "/etc/luks"
 )
 
 var (
@@ -127,6 +128,25 @@ func buildCommand() []string {
 				virtV2vArgs = append(virtV2vArgs, "--mac", macToIp)
 			}
 		}
+		// Adds LUKS keys, if exist.
+		if _, err := os.Stat(LUKSDIR); os.IsNotExist(err) {
+			// do nothing
+		} else {
+			if err != nil && !os.IsNotExist(err) {
+				fmt.Println("Error accessing the LUKS directory ", err)
+				os.Exit(1)
+			}
+			files, err := getFilesInPath(LUKSDIR)
+			if err != nil {
+				fmt.Println("Error reading files in LUKS directory ", err)
+				os.Exit(1)
+			}
+			for _, file := range files {
+				virtV2vArgs = append(virtV2vArgs, "--key", fmt.Sprintf("all:file:%s", file))
+			}
+		}
+		// fallback to clevis, harmless
+		virtV2vArgs = append(virtV2vArgs, "--key", "all:clevis")
 
 		if info, err := os.Stat(VDDK); err == nil && info.IsDir() {
 			virtV2vArgs = append(virtV2vArgs,
@@ -149,6 +169,20 @@ func buildCommand() []string {
 	return virtV2vArgs
 }
 
+func getFilesInPath(rootPath string) (paths []string, err error) {
+	files, err := os.ReadDir(rootPath)
+	if err != nil {
+		fmt.Println("Error reading the files in the directory ", err)
+		return
+	}
+	for _, file := range files {
+		if !file.IsDir() && !strings.HasPrefix(file.Name(), "..") {
+			paths = append(paths, fmt.Sprintf("%s/%s", rootPath, file.Name()))
+		}
+	}
+	return
+}
+
 func checkEnvVariablesSet(envVars ...string) bool {
 	for _, v := range envVars {
 		if os.Getenv(v) == "" {