/
utils.go
251 lines (222 loc) · 7.29 KB
/
utils.go
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// FIXME(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
//go:build go1.19
package command
import (
"bufio"
"context"
"fmt"
"io"
"os"
"os/signal"
"path/filepath"
"runtime"
"strings"
"syscall"
"github.com/docker/cli/cli/streams"
"github.com/docker/docker/api/types/filters"
mounttypes "github.com/docker/docker/api/types/mount"
"github.com/docker/docker/api/types/versions"
"github.com/docker/docker/errdefs"
"github.com/moby/sys/sequential"
"github.com/pkg/errors"
"github.com/spf13/pflag"
)
// CopyToFile writes the content of the reader to the specified file
func CopyToFile(outfile string, r io.Reader) error {
// We use sequential file access here to avoid depleting the standby list
// on Windows. On Linux, this is a call directly to os.CreateTemp
tmpFile, err := sequential.CreateTemp(filepath.Dir(outfile), ".docker_temp_")
if err != nil {
return err
}
tmpPath := tmpFile.Name()
_, err = io.Copy(tmpFile, r)
tmpFile.Close()
if err != nil {
os.Remove(tmpPath)
return err
}
if err = os.Rename(tmpPath, outfile); err != nil {
os.Remove(tmpPath)
return err
}
return nil
}
// capitalizeFirst capitalizes the first character of string
func capitalizeFirst(s string) string {
switch l := len(s); l {
case 0:
return s
case 1:
return strings.ToLower(s)
default:
return strings.ToUpper(string(s[0])) + strings.ToLower(s[1:])
}
}
// PrettyPrint outputs arbitrary data for human formatted output by uppercasing the first letter.
func PrettyPrint(i any) string {
switch t := i.(type) {
case nil:
return "None"
case string:
return capitalizeFirst(t)
default:
return capitalizeFirst(fmt.Sprintf("%s", t))
}
}
var ErrPromptTerminated = errdefs.Cancelled(errors.New("prompt terminated"))
// PromptForConfirmation requests and checks confirmation from the user.
// This will display the provided message followed by ' [y/N] '. If the user
// input 'y' or 'Y' it returns true otherwise false. If no message is provided,
// "Are you sure you want to proceed? [y/N] " will be used instead.
//
// If the user terminates the CLI with SIGINT or SIGTERM while the prompt is
// active, the prompt will return false with an ErrPromptTerminated error.
// When the prompt returns an error, the caller should propagate the error up
// the stack and close the io.Reader used for the prompt which will prevent the
// background goroutine from blocking indefinitely.
func PromptForConfirmation(ctx context.Context, ins io.Reader, outs io.Writer, message string) (bool, error) {
if message == "" {
message = "Are you sure you want to proceed?"
}
message += " [y/N] "
_, _ = fmt.Fprint(outs, message)
// On Windows, force the use of the regular OS stdin stream.
if runtime.GOOS == "windows" {
ins = streams.NewIn(os.Stdin)
}
result := make(chan bool)
// Catch the termination signal and exit the prompt gracefully.
// The caller is responsible for properly handling the termination.
notifyCtx, notifyCancel := signal.NotifyContext(ctx, syscall.SIGINT, syscall.SIGTERM)
defer notifyCancel()
go func() {
var res bool
scanner := bufio.NewScanner(ins)
if scanner.Scan() {
answer := strings.TrimSpace(scanner.Text())
if strings.EqualFold(answer, "y") {
res = true
}
}
result <- res
}()
select {
case <-notifyCtx.Done():
// print a newline on termination
_, _ = fmt.Fprintln(outs, "")
return false, ErrPromptTerminated
case r := <-result:
return r, nil
}
}
// PruneFilters returns consolidated prune filters obtained from config.json and cli
func PruneFilters(dockerCli Cli, pruneFilters filters.Args) filters.Args {
if dockerCli.ConfigFile() == nil {
return pruneFilters
}
for _, f := range dockerCli.ConfigFile().PruneFilters {
k, v, ok := strings.Cut(f, "=")
if !ok {
continue
}
if k == "label" {
// CLI label filter supersede config.json.
// If CLI label filter conflict with config.json,
// skip adding label! filter in config.json.
if pruneFilters.Contains("label!") && pruneFilters.ExactMatch("label!", v) {
continue
}
} else if k == "label!" {
// CLI label! filter supersede config.json.
// If CLI label! filter conflict with config.json,
// skip adding label filter in config.json.
if pruneFilters.Contains("label") && pruneFilters.ExactMatch("label", v) {
continue
}
}
pruneFilters.Add(k, v)
}
return pruneFilters
}
// AddPlatformFlag adds `platform` to a set of flags for API version 1.32 and later.
func AddPlatformFlag(flags *pflag.FlagSet, target *string) {
flags.StringVar(target, "platform", os.Getenv("DOCKER_DEFAULT_PLATFORM"), "Set platform if server is multi-platform capable")
flags.SetAnnotation("platform", "version", []string{"1.32"})
}
// ValidateOutputPath validates the output paths of the `export` and `save` commands.
func ValidateOutputPath(path string) error {
dir := filepath.Dir(filepath.Clean(path))
if dir != "" && dir != "." {
if _, err := os.Stat(dir); os.IsNotExist(err) {
return errors.Errorf("invalid output path: directory %q does not exist", dir)
}
}
// check whether `path` points to a regular file
// (if the path exists and doesn't point to a directory)
if fileInfo, err := os.Stat(path); !os.IsNotExist(err) {
if err != nil {
return err
}
if fileInfo.Mode().IsDir() || fileInfo.Mode().IsRegular() {
return nil
}
if err := ValidateOutputPathFileMode(fileInfo.Mode()); err != nil {
return errors.Wrapf(err, fmt.Sprintf("invalid output path: %q must be a directory or a regular file", path))
}
}
return nil
}
// ValidateOutputPathFileMode validates the output paths of the `cp` command and serves as a
// helper to `ValidateOutputPath`
func ValidateOutputPathFileMode(fileMode os.FileMode) error {
switch {
case fileMode&os.ModeDevice != 0:
return errors.New("got a device")
case fileMode&os.ModeIrregular != 0:
return errors.New("got an irregular file")
}
return nil
}
func stringSliceIndex(s, subs []string) int {
j := 0
if len(subs) > 0 {
for i, x := range s {
if j < len(subs) && subs[j] == x {
j++
} else {
j = 0
}
if len(subs) == j {
return i + 1 - j
}
}
}
return -1
}
// StringSliceReplaceAt replaces the sub-slice find, with the sub-slice replace, in the string
// slice s, returning a new slice and a boolean indicating if the replacement happened.
// requireIdx is the index at which old needs to be found at (or -1 to disregard that).
func StringSliceReplaceAt(s, find, replace []string, requireIndex int) ([]string, bool) {
idx := stringSliceIndex(s, find)
if (requireIndex != -1 && requireIndex != idx) || idx == -1 {
return s, false
}
out := append([]string{}, s[:idx]...)
out = append(out, replace...)
out = append(out, s[idx+len(find):]...)
return out, true
}
// ValidateMountWithAPIVersion validates a mount with the server API version.
func ValidateMountWithAPIVersion(m mounttypes.Mount, serverAPIVersion string) error {
if m.BindOptions != nil {
if m.BindOptions.NonRecursive && versions.LessThan(serverAPIVersion, "1.40") {
return errors.Errorf("bind-recursive=disabled requires API v1.40 or later")
}
// ReadOnlyNonRecursive can be safely ignored when API < 1.44
if m.BindOptions.ReadOnlyForceRecursive && versions.LessThan(serverAPIVersion, "1.44") {
return errors.Errorf("bind-recursive=readonly requires API v1.44 or later")
}
}
return nil
}