Add functions to produce a string representation of a partition

so that we encapsulate all the logic in the same package

Signed-off-by: Dimitris Karakasilis <dimitris@karakasilis.me>

main.go

@@ -17,6 +17,8 @@ import (
 	"github.com/mudler/go-pluggable"
 	cp "github.com/otiai10/copy"
 	"github.com/urfave/cli"
+
+	pi "github.com/kairos-io/kcrypt/pkg/partition_info"
 )
 
 func waitdevice(device string, attempts int) error {
@@ -152,7 +154,7 @@ func luksify(label string) (string, error) {
 		return "", fmt.Errorf("err: %w, out: %s", err, out2)
 	}
 
-	return fmt.Sprintf("%s:%s:%s", b.Label, b.Name, b.UUID), nil
+	return pi.PartitionToString(b), nil
 }
 
 func findPartition(label string) (string, *block.Partition, error) {

pkg/partition_info/partition_info.go

@@ -1,9 +1,11 @@
 package partition_info
 
 import (
+	"fmt"
 	"io/ioutil"
 	"strings"
 
+	"github.com/jaypipes/ghw/pkg/block"
 	"github.com/pkg/errors"
 	"gopkg.in/yaml.v3"
 )
@@ -15,6 +17,18 @@ import (
 // and make the request.
 type PartitionInfo map[string]string
 
+func PartitionToString(p *block.Partition) string {
+	return fmt.Sprintf("%s:%s:%s", p.Label, p.Name, p.UUID)
+}
+
+// Takes a partition info string (as returned by PartitionToString) and return
+// the partition label and the UUID
+func PartitionDataFromString(partitionStr string) (string, string) {
+	parts := strings.Split(partitionStr, ":")
+
+	return parts[0], parts[2]
+}
+
 // UpdatePartitionLabelMapping takes partition information as a string argument
 // the the form: `label:name:uuid` (that's what the `kcrypt encrypt` command returns
 // on success. This function stores it in the PartitionInfoFile yaml file for
@@ -25,8 +39,8 @@ func UpdatePartitionLabelMapping(partitionData, file string) error {
 		return err
 	}
 
-	parts := strings.Split(partitionData, ":")
-	partitionInfo[parts[0]] = parts[2]
+	label, uuid := PartitionDataFromString(partitionData)
+	partitionInfo[label] = uuid
 
 	return UpdatePartitionInfoFile(partitionInfo, file)
 }

pkg/partition_info/partition_info_test.go

@@ -4,6 +4,7 @@ import (
 	"io/ioutil"
 	"os"
 
+	"github.com/jaypipes/ghw/pkg/block"
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 
@@ -99,4 +100,36 @@ TO_KEEP: old_uuid_1
 			Expect(string(dat)).To(Equal(expectedContent))
 		})
 	})
+
+	Describe("PartitionToString", func() {
+		var partition *block.Partition
+
+		BeforeEach(func() {
+			partition = &block.Partition{
+				Disk:       nil,
+				Name:       "sda1",
+				Label:      "COS_PERSISTENT",
+				MountPoint: "/mnt/sda1",
+				UUID:       "some_uuid_here",
+			}
+		})
+
+		It("returns a string representation of the partition data", func() {
+			Expect(pi.PartitionToString(partition)).To(Equal("COS_PERSISTENT:sda1:some_uuid_here"))
+		})
+	})
+
+	Describe("PartitionDataFromString", func() {
+		var partitionData string
+
+		BeforeEach(func() {
+			partitionData = "THE_LABEL:the_name:the_uuid"
+		})
+
+		It("returns the label and the uuid", func() {
+			label, uuid := pi.PartitionDataFromString(partitionData)
+			Expect(label).To(Equal("THE_LABEL"))
+			Expect(uuid).To(Equal("the_uuid"))
+		})
+	})
 })