Initial devcontainer listing

Author: stuartleeks

.gitignore

@@ -0,0 +1 @@
+/devcontainer

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 Stuart Leeks
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

@@ -0,0 +1,2 @@
+build:
+	go build ./cmd/devcontainer

cmd/devcontainer/main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"sort"
+	"text/tabwriter"
+
+	"github.com/spf13/cobra"
+	"github.com/stuartleeks/devcontainer-cli/internal/pkg/devcontainers"
+)
+
+func main() {
+	var listIncludeContainerNames bool
+	var listVerbose bool
+
+	var rootCmd = &cobra.Command{Use: "devcontainer"}
+
+	var cmdList = &cobra.Command{
+		Use:   "list",
+		Short: "List devcontainers",
+		Long:  "Lists devcontainers that are currently running",
+		Run: func(cmd *cobra.Command, args []string) {
+			if listIncludeContainerNames && listVerbose {
+				fmt.Println("Can't use both verbose and include-container-names")
+				os.Exit(1)
+			}
+			devcontainers, err := devcontainers.ListDevcontainers()
+			if err != nil {
+				fmt.Printf("Error: %v", err)
+				os.Exit(1)
+			}
+			if listVerbose {
+				sort.Slice(devcontainers, func(i, j int) bool { return devcontainers[i].DevcontainerName < devcontainers[j].DevcontainerName })
+
+				w := new(tabwriter.Writer)
+				// minwidth, tabwidth, padding, padchar, flags
+				w.Init(os.Stdout, 8, 8, 0, '\t', 0)
+				defer w.Flush()
+
+				fmt.Fprintf(w, "\n %s\t%s\t", "Devcontainer name", "Container name")
+				fmt.Fprintf(w, "\n %s\t%s\t", "----", "----")
+
+				for _, devcontainer := range devcontainers {
+					fmt.Fprintf(w, "\n %s\t%s\t", devcontainer.DevcontainerName, devcontainer.ContainerName)
+				}
+				fmt.Fprintln(w)
+				return
+			}
+			names := []string{}
+			for _, devcontainer := range devcontainers {
+				names = append(names, devcontainer.DevcontainerName)
+			}
+			if listIncludeContainerNames {
+				for _, devcontainer := range devcontainers {
+					names = append(names, devcontainer.ContainerName)
+				}
+			}
+			sort.Strings(names)
+			for _, name := range names {
+				fmt.Println(name)
+			}
+		},
+	}
+	cmdList.Flags().BoolVar(&listIncludeContainerNames, "include-container-names", false, "Also include container names in the list")
+	cmdList.Flags().BoolVarP(&listVerbose, "verbose", "v", false, "Verbose output")
+
+	rootCmd.AddCommand(cmdList)
+	rootCmd.Execute()
+}

go.mod

@@ -0,0 +1,5 @@
+module github.com/stuartleeks/devcontainer-cli
+
+go 1.14
+
+require github.com/spf13/cobra v1.0.0

go.sum

@@ -0,0 +1,127 @@
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internal/pkg/devcontainers/dockerutils.go

@@ -0,0 +1,69 @@
+package devcontainers
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+// Devcontainer names are a derived property.
+// For Dockerfile-based devcontainers this is derived from the image name
+// E.g. vsc-vscode-remote-test-dockerfile-16020a1c793898f64e7c9cff44437369 => vscode-remote-test-dockerfile
+// For dockercompose-based devcontainers this is derived from the com.docker.compose.project
+// and com.docker.compose.service labels with a slash separator. E.g. vscode-remote-test-dockercompose_devcontainer\web
+
+// DevcontainerInfo holds details about a devcontainer
+type DevcontainerInfo struct {
+	ContainerID      string
+	ContainerName    string
+	DevcontainerName string
+}
+
+const (
+	ListPartID                     int = 0
+	ListPartLocalFolder            int = 1
+	ListPartComposeProject         int = 2
+	ListPartComposeService         int = 3
+	ListPartComposeContainerNumber int = 4
+	ListPartContainerName          int = 5
+)
+
+// ListDevcontainers returns a list of devcontainers
+func ListDevcontainers() ([]DevcontainerInfo, error) {
+	cmd := exec.Command("docker", "ps", "--format", "{{.ID}}|{{.Label \"vsch.local.folder\"}}|{{.Label \"com.docker.compose.project\"}}|{{.Label \"com.docker.compose.service\"}}|{{.Label \"com.docker.compose.container-number\"}}|{{.Names}}")
+
+	output, err := cmd.Output()
+	if err != nil {
+		return []DevcontainerInfo{}, fmt.Errorf("Failed to read docker stdout: %v", err)
+	}
+
+	reader := bytes.NewReader(output)
+	scanner := bufio.NewScanner(reader)
+	if scanner == nil {
+		return []DevcontainerInfo{}, fmt.Errorf("Failed to parse stdout")
+	}
+	devcontainers := []DevcontainerInfo{}
+	for scanner.Scan() {
+		line := scanner.Text()
+		parts := strings.Split(line, "|")
+		name := parts[ListPartLocalFolder]
+		if name == "" {
+			// No local folder => use dockercompose parts
+			name = fmt.Sprintf("%s/%s", parts[ListPartComposeProject], parts[ListPartComposeService])
+		} else {
+			// get the last path segment for the name
+			if index := strings.LastIndexAny(name, "/\\"); index >= 0 {
+				name = name[index+1:]
+			}
+		}
+		devcontainer := DevcontainerInfo{
+			ContainerID:      parts[ListPartID],
+			ContainerName:    parts[ListPartContainerName],
+			DevcontainerName: name,
+		}
+		devcontainers = append(devcontainers, devcontainer)
+	}
+	return devcontainers, nil
+}