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types.go
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/
types.go
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package define
import (
"bufio"
"bytes"
"errors"
"fmt"
"io/ioutil"
"net/http"
urlpkg "net/url"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"github.com/containers/image/v5/manifest"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/chrootarchive"
"github.com/containers/storage/pkg/ioutils"
"github.com/containers/storage/types"
v1 "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/sirupsen/logrus"
)
const (
// Package is the name of this package, used in help output and to
// identify working containers.
Package = "buildah"
// Version for the Package. Bump version in contrib/rpm/buildah.spec
// too.
Version = "1.27.2"
// DefaultRuntime if containers.conf fails.
DefaultRuntime = "runc"
// OCIv1ImageManifest is the MIME type of an OCIv1 image manifest,
// suitable for specifying as a value of the PreferredManifestType
// member of a CommitOptions structure. It is also the default.
OCIv1ImageManifest = v1.MediaTypeImageManifest
// Dockerv2ImageManifest is the MIME type of a Docker v2s2 image
// manifest, suitable for specifying as a value of the
// PreferredManifestType member of a CommitOptions structure.
Dockerv2ImageManifest = manifest.DockerV2Schema2MediaType
// OCI used to define the "oci" image format
OCI = "oci"
// DOCKER used to define the "docker" image format
DOCKER = "docker"
)
var (
// DefaultCapabilities is the list of capabilities which we grant by
// default to containers which are running under UID 0.
DefaultCapabilities = []string{
"CAP_AUDIT_WRITE",
"CAP_CHOWN",
"CAP_DAC_OVERRIDE",
"CAP_FOWNER",
"CAP_FSETID",
"CAP_KILL",
"CAP_MKNOD",
"CAP_NET_BIND_SERVICE",
"CAP_SETFCAP",
"CAP_SETGID",
"CAP_SETPCAP",
"CAP_SETUID",
"CAP_SYS_CHROOT",
}
// DefaultNetworkSysctl is the list of Kernel parameters which we
// grant by default to containers which are running under UID 0.
DefaultNetworkSysctl = map[string]string{
"net.ipv4.ping_group_range": "0 0",
}
Gzip = archive.Gzip
Bzip2 = archive.Bzip2
Xz = archive.Xz
Zstd = archive.Zstd
Uncompressed = archive.Uncompressed
)
// IDMappingOptions controls how we set up UID/GID mapping when we set up a
// user namespace.
type IDMappingOptions struct {
HostUIDMapping bool
HostGIDMapping bool
UIDMap []specs.LinuxIDMapping
GIDMap []specs.LinuxIDMapping
AutoUserNs bool
AutoUserNsOpts types.AutoUserNsOptions
}
// Secret is a secret source that can be used in a RUN
type Secret struct {
ID string
Source string
SourceType string
}
// BuildOutputOptions contains the the outcome of parsing the value of a build --output flag
type BuildOutputOption struct {
Path string // Only valid if !IsStdout
IsDir bool
IsStdout bool
}
// TempDirForURL checks if the passed-in string looks like a URL or -. If it is,
// TempDirForURL creates a temporary directory, arranges for its contents to be
// the contents of that URL, and returns the temporary directory's path, along
// with the name of a subdirectory which should be used as the build context
// (which may be empty or "."). Removal of the temporary directory is the
// responsibility of the caller. If the string doesn't look like a URL,
// TempDirForURL returns empty strings and a nil error code.
func TempDirForURL(dir, prefix, url string) (name string, subdir string, err error) {
if !strings.HasPrefix(url, "http://") &&
!strings.HasPrefix(url, "https://") &&
!strings.HasPrefix(url, "git://") &&
!strings.HasPrefix(url, "github.com/") &&
url != "-" {
return "", "", nil
}
name, err = ioutil.TempDir(dir, prefix)
if err != nil {
return "", "", fmt.Errorf("error creating temporary directory for %q: %w", url, err)
}
urlParsed, err := urlpkg.Parse(url)
if err != nil {
return "", "", fmt.Errorf("error parsing url %q: %w", url, err)
}
if strings.HasPrefix(url, "git://") || strings.HasSuffix(urlParsed.Path, ".git") {
combinedOutput, gitSubDir, err := cloneToDirectory(url, name)
if err != nil {
if err2 := os.RemoveAll(name); err2 != nil {
logrus.Debugf("error removing temporary directory %q: %v", name, err2)
}
return "", "", fmt.Errorf("cloning %q to %q:\n%s: %w", url, name, string(combinedOutput), err)
}
return name, gitSubDir, nil
}
if strings.HasPrefix(url, "github.com/") {
ghurl := url
url = fmt.Sprintf("https://%s/archive/master.tar.gz", ghurl)
logrus.Debugf("resolving url %q to %q", ghurl, url)
subdir = path.Base(ghurl) + "-master"
}
if strings.HasPrefix(url, "http://") || strings.HasPrefix(url, "https://") {
err = downloadToDirectory(url, name)
if err != nil {
if err2 := os.RemoveAll(name); err2 != nil {
logrus.Debugf("error removing temporary directory %q: %v", name, err2)
}
return "", subdir, err
}
return name, subdir, nil
}
if url == "-" {
err = stdinToDirectory(name)
if err != nil {
if err2 := os.RemoveAll(name); err2 != nil {
logrus.Debugf("error removing temporary directory %q: %v", name, err2)
}
return "", subdir, err
}
logrus.Debugf("Build context is at %q", name)
return name, subdir, nil
}
logrus.Debugf("don't know how to retrieve %q", url)
if err2 := os.Remove(name); err2 != nil {
logrus.Debugf("error removing temporary directory %q: %v", name, err2)
}
return "", "", errors.New("unreachable code reached")
}
// parseGitBuildContext parses git build context to `repo`, `sub-dir`
// `branch/commit`, accepts GitBuildContext in the format of
// `repourl.git[#[branch-or-commit]:subdir]`.
func parseGitBuildContext(url string) (string, string, string) {
gitSubdir := ""
gitBranch := ""
gitBranchPart := strings.Split(url, "#")
if len(gitBranchPart) > 1 {
// check if string contains path to a subdir
gitSubDirPart := strings.Split(gitBranchPart[1], ":")
if len(gitSubDirPart) > 1 {
gitSubdir = gitSubDirPart[1]
}
gitBranch = gitSubDirPart[0]
}
return gitBranchPart[0], gitSubdir, gitBranch
}
func cloneToDirectory(url, dir string) ([]byte, string, error) {
var cmd *exec.Cmd
gitRepo, gitSubdir, gitBranch := parseGitBuildContext(url)
// init repo
cmd = exec.Command("git", "init", dir)
combinedOutput, err := cmd.CombinedOutput()
if err != nil {
return combinedOutput, gitSubdir, fmt.Errorf("failed while performing `git init`: %w", err)
}
// add origin
cmd = exec.Command("git", "remote", "add", "origin", gitRepo)
cmd.Dir = dir
combinedOutput, err = cmd.CombinedOutput()
if err != nil {
return combinedOutput, gitSubdir, fmt.Errorf("failed while performing `git remote add`: %w", err)
}
// fetch required branch or commit and perform checkout
// Always default to `HEAD` if nothing specified
fetch := "HEAD"
if gitBranch != "" {
fetch = gitBranch
}
logrus.Debugf("fetching repo %q and branch (or commit ID) %q to %q", gitRepo, fetch, dir)
cmd = exec.Command("git", "fetch", "--depth=1", "origin", "--", fetch)
cmd.Dir = dir
combinedOutput, err = cmd.CombinedOutput()
if err != nil {
return combinedOutput, gitSubdir, fmt.Errorf("failed while performing `git fetch`: %w", err)
}
if fetch == "HEAD" {
// We fetched default branch therefore
// we don't have any valid `branch` or
// `commit` name hence checkout detached
// `FETCH_HEAD`
fetch = "FETCH_HEAD"
}
cmd = exec.Command("git", "checkout", fetch)
cmd.Dir = dir
combinedOutput, err = cmd.CombinedOutput()
if err != nil {
return combinedOutput, gitSubdir, fmt.Errorf("failed while performing `git checkout`: %w", err)
}
return combinedOutput, gitSubdir, nil
}
func downloadToDirectory(url, dir string) error {
logrus.Debugf("extracting %q to %q", url, dir)
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusBadRequest {
return fmt.Errorf("invalid response status %d", resp.StatusCode)
}
if resp.ContentLength == 0 {
return fmt.Errorf("no contents in %q", url)
}
if err := chrootarchive.Untar(resp.Body, dir, nil); err != nil {
resp1, err := http.Get(url)
if err != nil {
return err
}
defer resp1.Body.Close()
body, err := ioutil.ReadAll(resp1.Body)
if err != nil {
return err
}
dockerfile := filepath.Join(dir, "Dockerfile")
// Assume this is a Dockerfile
if err := ioutils.AtomicWriteFile(dockerfile, body, 0600); err != nil {
return fmt.Errorf("failed to write %q to %q: %w", url, dockerfile, err)
}
}
return nil
}
func stdinToDirectory(dir string) error {
logrus.Debugf("extracting stdin to %q", dir)
r := bufio.NewReader(os.Stdin)
b, err := ioutil.ReadAll(r)
if err != nil {
return fmt.Errorf("failed to read from stdin: %w", err)
}
reader := bytes.NewReader(b)
if err := chrootarchive.Untar(reader, dir, nil); err != nil {
dockerfile := filepath.Join(dir, "Dockerfile")
// Assume this is a Dockerfile
if err := ioutils.AtomicWriteFile(dockerfile, b, 0600); err != nil {
return fmt.Errorf("failed to write bytes to %q: %w", dockerfile, err)
}
}
return nil
}