mirror of https://github.com/docker/cli.git
70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
package image
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import (
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"context"
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"crypto/rand"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/docker/cli/cli/command"
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cliconfig "github.com/docker/cli/cli/config"
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"github.com/docker/docker/api/types/versions"
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"github.com/moby/buildkit/session"
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"github.com/pkg/errors"
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)
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const clientSessionRemote = "client-session"
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func isSessionSupported(dockerCli command.Cli, forStream bool) bool {
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if !forStream && versions.GreaterThanOrEqualTo(dockerCli.Client().ClientVersion(), "1.39") {
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return true
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}
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return dockerCli.ServerInfo().HasExperimental && versions.GreaterThanOrEqualTo(dockerCli.Client().ClientVersion(), "1.31")
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}
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func trySession(dockerCli command.Cli, contextDir string, forStream bool) (*session.Session, error) {
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if !isSessionSupported(dockerCli, forStream) {
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return nil, nil
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}
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sharedKey := getBuildSharedKey(contextDir)
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s, err := session.NewSession(context.Background(), filepath.Base(contextDir), sharedKey)
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if err != nil {
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return nil, errors.Wrap(err, "failed to create session")
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}
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return s, nil
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}
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func getBuildSharedKey(dir string) string {
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// build session is hash of build dir with node based randomness
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s := sha256.Sum256([]byte(fmt.Sprintf("%s:%s", tryNodeIdentifier(), dir)))
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return hex.EncodeToString(s[:])
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}
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func tryNodeIdentifier() string {
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out := cliconfig.Dir() // return config dir as default on permission error
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if err := os.MkdirAll(cliconfig.Dir(), 0700); err == nil {
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sessionFile := filepath.Join(cliconfig.Dir(), ".buildNodeID")
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if _, err := os.Lstat(sessionFile); err != nil {
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if os.IsNotExist(err) { // create a new file with stored randomness
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b := make([]byte, 32)
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if _, err := rand.Read(b); err != nil {
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return out
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}
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if err := ioutil.WriteFile(sessionFile, []byte(hex.EncodeToString(b)), 0600); err != nil {
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return out
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}
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}
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}
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dt, err := ioutil.ReadFile(sessionFile)
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if err == nil {
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return string(dt)
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}
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}
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return out
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}
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