78f02465e2
* Fix two small compiler errors
Apparently, in go, `fmt.Prntln("\n")` is a build error - you can't
have a redundant newline there. Also, we had the wrong format string
somewhere.
* Use $GOPATH to find dep
When I first pulled this branch, all the tests failed because,
although `dep` was being installed to my local machine, it wasn't
being added to $PATH. Rather than mess with $PATH, I decided to
add $GOPATH/bin to the beginning of the invocation.
105 lines
1.8 KiB
Go
105 lines
1.8 KiB
Go
package image
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import (
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"io"
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"os"
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"bufio"
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"github.com/docker/docker/client"
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"fmt"
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"encoding/json"
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"golang.org/x/net/context"
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)
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func check(e error) {
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if e != nil {
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panic(e)
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}
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}
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func saveImage(readCloser io.ReadCloser) {
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defer readCloser.Close()
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path := ".image"
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if _, err := os.Stat(path); os.IsNotExist(err) {
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os.Mkdir(path, 0755)
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}
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fo, err := os.Create(".image/cache.tar")
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check(err)
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defer func() {
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if err := fo.Close(); err != nil {
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panic(err)
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}
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}()
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w := bufio.NewWriter(fo)
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buf := make([]byte, 1024)
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for {
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n, err := readCloser.Read(buf)
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if err != nil && err != io.EOF {
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panic(err)
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}
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if n == 0 {
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break
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}
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if _, err := w.Write(buf[:n]); err != nil {
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panic(err)
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}
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}
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if err = w.Flush(); err != nil {
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panic(err)
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}
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}
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func WriteImage() {
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ctx := context.Background()
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cli, err := client.NewEnvClient()
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if err != nil {
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panic(err)
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}
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// imageID := "golang:alpine"
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imageID := "die-test:latest"
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fmt.Println("Saving Image...")
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readCloser, err := cli.ImageSave(ctx, []string{imageID})
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check(err)
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saveImage(readCloser)
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for {
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inspect, _, err := cli.ImageInspectWithRaw(ctx, imageID)
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check(err)
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history, err := cli.ImageHistory(ctx, imageID)
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check(err)
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historyStr, err := json.MarshalIndent(history, "", " ")
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check(err)
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layerStr := ""
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for idx, layer := range inspect.RootFS.Layers {
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prefix := "├── "
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if idx == len(inspect.RootFS.Layers)-1 {
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prefix = "└── "
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}
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layerStr += fmt.Sprintf("%s%s\n", prefix, layer)
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}
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fmt.Printf("Image: %s\nId: %s\nParent: %s\nLayers: %d\n%sHistory: %s\n", imageID, inspect.ID, inspect.Parent, len(inspect.RootFS.Layers), layerStr, historyStr)
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fmt.Println("")
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if inspect.Parent == "" {
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break
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} else {
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imageID = inspect.Parent
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}
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}
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fmt.Println("See './.image' for the cached image tar")
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}
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