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package imagebuildah
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"net/http"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"github.com/containers/buildah"
"github.com/containers/storage/pkg/chrootarchive"
"github.com/containers/storage/pkg/ioutils"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
func cloneToDirectory(url, dir string) error {
if !strings.HasPrefix(url, "git://") && !strings.HasSuffix(url, ".git") {
url = "git://" + url
}
gitBranch := strings.Split(url, "#")
var cmd *exec.Cmd
if len(gitBranch) < 2 {
logrus.Debugf("cloning %q to %q", url, dir)
cmd = exec.Command("git", "clone", url, dir)
} else {
logrus.Debugf("cloning repo %q and branch %q to %q", gitBranch[0], gitBranch[1], dir)
cmd = exec.Command("git", "clone", "-b", gitBranch[1], gitBranch[0], dir)
}
return cmd.Run()
}
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.ContentLength == 0 {
return errors.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 errors.Wrapf(err, "Failed to write %q to %q", url, dockerfile)
}
}
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 errors.Wrapf(err, "Failed to read from stdin")
}
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 errors.Wrapf(err, "Failed to write bytes to %q", dockerfile)
}
}
return nil
}
// 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 "", "", errors.Wrapf(err, "error creating temporary directory for %q", url)
}
if strings.HasPrefix(url, "git://") || strings.HasSuffix(url, ".git") {
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 "", "", err
}
return name, "", 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.Errorf("unreachable code reached")
}
// InitReexec is a wrapper for buildah.InitReexec(). It should be called at
// the start of main(), and if it returns true, main() should return
// immediately.
func InitReexec() bool {
return buildah.InitReexec()
}
func convertMounts(mounts []Mount) []specs.Mount {
specmounts := []specs.Mount{}
for _, m := range mounts {
s := specs.Mount{
Destination: m.Destination,
Type: m.Type,
Source: m.Source,
Options: m.Options,
}
specmounts = append(specmounts, s)
}
return specmounts
}
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