forked from containers/buildah
/
from.go
253 lines (231 loc) · 7.46 KB
/
from.go
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package main
import (
"fmt"
"io/ioutil"
"os"
"strings"
"github.com/containers/buildah"
buildahcli "github.com/containers/buildah/pkg/cli"
"github.com/containers/buildah/pkg/parse"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
type fromReply struct {
authfile string
certDir string
cidfile string
creds string
format string
name string
pull bool
pullAlways bool
quiet bool
signaturePolicy string
tlsVerify bool
*buildahcli.FromAndBudResults
*buildahcli.UserNSResults
*buildahcli.NameSpaceResults
}
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 := buildahcli.FromAndBudResults{}
userNSResults := buildahcli.UserNSResults{}
namespaceResults := buildahcli.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", "", "path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json")
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.BoolVar(&opts.pull, "pull", true, "pull the image if not present")
flags.BoolVar(&opts.pullAlways, "pull-always", false, "pull the image even if named image is present in store (supersedes pull option)")
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.MarkHidden("signature-policy")
flags.BoolVar(&opts.tlsVerify, "tls-verify", true, "require HTTPS and verify certificates when accessing the registry")
// Add in the common flags
fromAndBudFlags := buildahcli.GetFromAndBudFlags(&fromAndBudResults, &userNSResults, &namespaceResults)
flags.AddFlagSet(&fromAndBudFlags)
rootCmd.AddCommand(fromCommand)
}
func onBuild(builder *buildah.Builder) error {
ctr := 0
for _, onBuildSpec := range builder.OnBuild() {
ctr = ctr + 1
commands := strings.Split(onBuildSpec, " ")
command := commands[0]
args := commands[1:]
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, false, 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":
if err := builder.Run(args, buildah.RunOptions{}); 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.Errorf("an image name (or \"scratch\") must be specified")
}
if err := buildahcli.VerifyFlagsArgsOrder(args); err != nil {
return err
}
if len(args) > 1 {
return errors.Errorf("too many arguments specified")
}
systemContext, err := parse.SystemContextFromOptions(c)
if err != nil {
return errors.Wrapf(err, "error building system context")
}
pullPolicy := buildah.PullNever
if iopts.pull {
pullPolicy = buildah.PullIfMissing
}
if iopts.pullAlways {
pullPolicy = buildah.PullAlways
}
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(c)
if err != nil {
return err
}
namespaceOptions, networkPolicy, err := parse.NamespaceOptions(c)
if err != nil {
return errors.Wrapf(err, "error parsing namespace-related options")
}
usernsOption, idmappingOptions, err := parse.IDMappingOptions(c, isolation)
if err != nil {
return errors.Wrapf(err, "error parsing ID mapping options")
}
namespaceOptions.AddOrReplace(usernsOption...)
format, err := getFormat(iopts.format)
if err != nil {
return err
}
options := buildah.BuilderOptions{
FromImage: args[0],
Container: iopts.name,
PullPolicy: pullPolicy,
SignaturePolicyPath: signaturePolicy,
SystemContext: systemContext,
DefaultMountsFilePath: globalFlagResults.DefaultMountsFile,
Isolation: isolation,
NamespaceOptions: namespaceOptions,
ConfigureNetwork: networkPolicy,
CNIPluginPath: iopts.CNIPlugInPath,
CNIConfigDir: iopts.CNIConfigDir,
IDMappingOptions: idmappingOptions,
AddCapabilities: iopts.CapAdd,
DropCapabilities: iopts.CapDrop,
CommonBuildOpts: commonOpts,
Format: format,
PullBlobDirectory: iopts.BlobCache,
}
if !iopts.quiet {
options.ReportWriter = os.Stderr
}
builder, err := buildah.NewBuilder(getContext(), store, options)
if err != nil {
return err
}
if err := onBuild(builder); err != nil {
return err
}
if iopts.cidfile != "" {
filePath := iopts.cidfile
if err := ioutil.WriteFile(filePath, []byte(builder.ContainerID), 0644); err != nil {
return errors.Wrapf(err, "filed to write Container ID File %q", filePath)
}
}
fmt.Printf("%s\n", builder.Container)
return builder.Save()
}