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from.go
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from.go
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package main
import (
"errors"
"fmt"
"io"
"os"
"strings"
"time"
"github.com/containers/buildah"
"github.com/containers/buildah/define"
"github.com/containers/buildah/pkg/cli"
"github.com/containers/buildah/pkg/parse"
"github.com/containers/common/pkg/auth"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
type fromReply struct {
authfile string
certDir string
cidfile string
creds string
format string
name string
pull string
pullAlways bool
pullNever bool
quiet bool
signaturePolicy string
tlsVerify bool
*cli.FromAndBudResults
*cli.UserNSResults
*cli.NameSpaceResults
}
var suffix string
func init() {
var (
fromDescription = "\n Creates a new working container, either from scratch or using a specified\n image as a starting point."
opts fromReply
)
fromAndBudResults := cli.FromAndBudResults{}
userNSResults := cli.UserNSResults{}
namespaceResults := cli.NameSpaceResults{}
fromCommand := &cobra.Command{
Use: "from",
Short: "Create a working container based on an image",
Long: fromDescription,
RunE: func(cmd *cobra.Command, args []string) error {
// Add in the results from the common cli commands
opts.FromAndBudResults = &fromAndBudResults
opts.UserNSResults = &userNSResults
opts.NameSpaceResults = &namespaceResults
return fromCmd(cmd, args, opts)
},
Example: `buildah from --pull imagename
buildah from docker-daemon:imagename:imagetag
buildah from --name "myimagename" myregistry/myrepository/imagename:imagetag`,
}
fromCommand.SetUsageTemplate(UsageTemplate())
flags := fromCommand.Flags()
flags.SetInterspersed(false)
flags.StringVar(&opts.authfile, "authfile", auth.GetDefaultAuthFile(), "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
flags.StringVar(&opts.certDir, "cert-dir", "", "use certificates at the specified path to access the registry")
flags.StringVar(&opts.cidfile, "cidfile", "", "write the container ID to the file")
flags.StringVar(&opts.creds, "creds", "", "use `[username[:password]]` for accessing the registry")
flags.StringVarP(&opts.format, "format", "f", defaultFormat(), "`format` of the image manifest and metadata")
flags.StringVar(&opts.name, "name", "", "`name` for the working container")
flags.StringVar(&opts.pull, "pull", "true", "pull images from the registry if newer or not present in store, if false, only pull images if not present, if always, pull images even if the named images are present in store, if never, only use images present in store if available")
flags.Lookup("pull").NoOptDefVal = "true" //allow `--pull ` to be set to `true` as expected.
flags.BoolVar(&opts.pullAlways, "pull-always", false, "pull the image even if the named image is present in store")
if err := flags.MarkHidden("pull-always"); err != nil {
panic(fmt.Sprintf("error marking the pull-always flag as hidden: %v", err))
}
flags.BoolVar(&opts.pullNever, "pull-never", false, "do not pull the image, use the image present in store if available")
if err := flags.MarkHidden("pull-never"); err != nil {
panic(fmt.Sprintf("error marking the pull-never flag as hidden: %v", err))
}
flags.BoolVarP(&opts.quiet, "quiet", "q", false, "don't output progress information when pulling images")
flags.StringVar(&opts.signaturePolicy, "signature-policy", "", "`pathname` of signature policy file (not usually used)")
flags.StringVar(&suffix, "suffix", "", "suffix to add to intermediate containers")
if err := flags.MarkHidden("suffix"); err != nil {
panic(fmt.Sprintf("error marking the suffix flag as hidden: %v", err))
}
if err := flags.MarkHidden("signature-policy"); err != nil {
panic(fmt.Sprintf("error marking signature-policy as hidden: %v", err))
}
flags.BoolVar(&opts.tlsVerify, "tls-verify", true, "require HTTPS and verify certificates when accessing the registry. TLS verification cannot be used when talking to an insecure registry.")
// Add in the common flags
fromAndBudFlags, err := cli.GetFromAndBudFlags(&fromAndBudResults, &userNSResults, &namespaceResults)
if err != nil {
logrus.Errorf("failed to setup From and Bud flags: %v", err)
os.Exit(1)
}
flags.AddFlagSet(&fromAndBudFlags)
flags.SetNormalizeFunc(cli.AliasFlags)
rootCmd.AddCommand(fromCommand)
}
func onBuild(builder *buildah.Builder, quiet bool) error {
ctr := 0
for _, onBuildSpec := range builder.OnBuild() {
ctr = ctr + 1
commands := strings.Split(onBuildSpec, " ")
command := strings.ToUpper(commands[0])
args := commands[1:]
if !quiet {
fmt.Fprintf(os.Stderr, "STEP %d: %s\n", ctr, onBuildSpec)
}
switch command {
case "ADD":
case "COPY":
dest := ""
size := len(args)
if size > 1 {
dest = args[size-1]
args = args[:size-1]
}
if err := builder.Add(dest, command == "ADD", buildah.AddAndCopyOptions{}, args...); err != nil {
return err
}
case "ANNOTATION":
annotation := strings.SplitN(args[0], "=", 2)
if len(annotation) > 1 {
builder.SetAnnotation(annotation[0], annotation[1])
} else {
builder.UnsetAnnotation(annotation[0])
}
case "CMD":
builder.SetCmd(args)
case "ENV":
env := strings.SplitN(args[0], "=", 2)
if len(env) > 1 {
builder.SetEnv(env[0], env[1])
} else {
builder.UnsetEnv(env[0])
}
case "ENTRYPOINT":
builder.SetEntrypoint(args)
case "EXPOSE":
builder.SetPort(strings.Join(args, " "))
case "HOSTNAME":
builder.SetHostname(strings.Join(args, " "))
case "LABEL":
label := strings.SplitN(args[0], "=", 2)
if len(label) > 1 {
builder.SetLabel(label[0], label[1])
} else {
builder.UnsetLabel(label[0])
}
case "MAINTAINER":
builder.SetMaintainer(strings.Join(args, " "))
case "ONBUILD":
builder.SetOnBuild(strings.Join(args, " "))
case "RUN":
var stdout io.Writer
if quiet {
stdout = io.Discard
}
if err := builder.Run(args, buildah.RunOptions{Stdout: stdout}); err != nil {
return err
}
case "SHELL":
builder.SetShell(args)
case "STOPSIGNAL":
builder.SetStopSignal(strings.Join(args, " "))
case "USER":
builder.SetUser(strings.Join(args, " "))
case "VOLUME":
builder.AddVolume(strings.Join(args, " "))
case "WORKINGDIR":
builder.SetWorkDir(strings.Join(args, " "))
default:
logrus.Errorf("unknown OnBuild command %q; ignored", onBuildSpec)
}
}
builder.ClearOnBuild()
return nil
}
func fromCmd(c *cobra.Command, args []string, iopts fromReply) error {
if len(args) == 0 {
return errors.New("an image name (or \"scratch\") must be specified")
}
if err := cli.VerifyFlagsArgsOrder(args); err != nil {
return err
}
if len(args) > 1 {
return errors.New("too many arguments specified")
}
if err := auth.CheckAuthFile(iopts.authfile); err != nil {
return err
}
systemContext, err := parse.SystemContextFromOptions(c)
if err != nil {
return fmt.Errorf("building system context: %w", err)
}
platforms, err := parse.PlatformsFromOptions(c)
if err != nil {
return err
}
if len(platforms) > 1 {
logrus.Warnf("ignoring platforms other than %+v: %+v", platforms[0], platforms[1:])
}
pullPolicy, err := parse.PullPolicyFromOptions(c)
if err != nil {
return err
}
signaturePolicy := iopts.signaturePolicy
store, err := getStore(c)
if err != nil {
return err
}
commonOpts, err := parse.CommonBuildOptions(c)
if err != nil {
return err
}
isolation, err := parse.IsolationOption(iopts.Isolation)
if err != nil {
return err
}
namespaceOptions, networkPolicy, err := parse.NamespaceOptions(c)
if err != nil {
return fmt.Errorf("parsing namespace-related options: %w", err)
}
usernsOption, idmappingOptions, err := parse.IDMappingOptions(c, isolation)
if err != nil {
return fmt.Errorf("parsing ID mapping options: %w", err)
}
namespaceOptions.AddOrReplace(usernsOption...)
format, err := cli.GetFormat(iopts.format)
if err != nil {
return err
}
devices := define.ContainerDevices{}
for _, device := range append(defaultContainerConfig.Containers.Devices.Get(), iopts.Devices...) {
dev, err := parse.DeviceFromPath(device)
if err != nil {
return err
}
devices = append(devices, dev...)
}
capabilities, err := defaultContainerConfig.Capabilities("", iopts.CapAdd, iopts.CapDrop)
if err != nil {
return err
}
commonOpts.Ulimit = append(defaultContainerConfig.Containers.DefaultUlimits.Get(), commonOpts.Ulimit...)
decConfig, err := cli.DecryptConfig(iopts.DecryptionKeys)
if err != nil {
return fmt.Errorf("unable to obtain decrypt config: %w", err)
}
options := buildah.BuilderOptions{
FromImage: args[0],
Container: iopts.name,
ContainerSuffix: suffix,
GroupAdd: iopts.GroupAdd,
PullPolicy: pullPolicy,
SignaturePolicyPath: signaturePolicy,
SystemContext: systemContext,
DefaultMountsFilePath: globalFlagResults.DefaultMountsFile,
Isolation: isolation,
NamespaceOptions: namespaceOptions,
ConfigureNetwork: networkPolicy,
CNIPluginPath: iopts.CNIPlugInPath,
CNIConfigDir: iopts.CNIConfigDir,
IDMappingOptions: idmappingOptions,
Capabilities: capabilities,
CommonBuildOpts: commonOpts,
Format: format,
BlobDirectory: iopts.BlobCache,
Devices: devices,
MaxPullRetries: iopts.Retry,
OciDecryptConfig: decConfig,
}
if iopts.RetryDelay != "" {
options.PullRetryDelay, err = time.ParseDuration(iopts.RetryDelay)
if err != nil {
return fmt.Errorf("unable to parse value provided %q as --retry-delay: %w", iopts.RetryDelay, err)
}
}
if !iopts.quiet {
options.ReportWriter = os.Stderr
}
builder, err := buildah.NewBuilder(getContext(), store, options)
if err != nil {
return err
}
if err := onBuild(builder, iopts.quiet); err != nil {
return err
}
if iopts.cidfile != "" {
filePath := iopts.cidfile
if err := os.WriteFile(filePath, []byte(builder.ContainerID), 0644); err != nil {
return fmt.Errorf("failed to write container ID file %q: %w", filePath, err)
}
}
fmt.Printf("%s\n", builder.Container)
return builder.Save()
}