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package build
import (
"archive/tar"
"bytes"
"context"
"net"
"strings"
"github.com/docker/buildx/driver"
"github.com/docker/cli/opts"
"github.com/docker/docker/builder/remotecontext/urlutil"
"github.com/moby/buildkit/util/gitutil"
"github.com/pkg/errors"
)
const (
// archiveHeaderSize is the number of bytes in an archive header
archiveHeaderSize = 512
// mobyHostGatewayName defines a special string which users can append to
// --add-host to add an extra entry in /etc/hosts that maps
// host.docker.internal to the host IP
mobyHostGatewayName = "host-gateway"
)
func IsRemoteURL(c string) bool {
if urlutil.IsURL(c) {
return true
}
if _, err := gitutil.ParseGitRef(c); err == nil {
return true
}
return false
}
func isArchive(header []byte) bool {
for _, m := range [][]byte{
{0x42, 0x5A, 0x68}, // bzip2
{0x1F, 0x8B, 0x08}, // gzip
{0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00}, // xz
} {
if len(header) < len(m) {
continue
}
if bytes.Equal(m, header[:len(m)]) {
return true
}
}
r := tar.NewReader(bytes.NewBuffer(header))
_, err := r.Next()
return err == nil
}
// toBuildkitExtraHosts converts hosts from docker key:value format to buildkit's csv format
func toBuildkitExtraHosts(ctx context.Context, inp []string, nodeDriver *driver.DriverHandle) (string, error) {
if len(inp) == 0 {
return "", nil
}
hosts := make([]string, 0, len(inp))
for _, h := range inp {
host, ip, ok := strings.Cut(h, "=")
if !ok {
host, ip, ok = strings.Cut(h, ":")
}
if !ok || host == "" || ip == "" {
return "", errors.Errorf("invalid host %s", h)
}
// If the IP Address is a "host-gateway", replace this value with the
// IP address provided by the worker's label.
if ip == mobyHostGatewayName {
hgip, err := nodeDriver.HostGatewayIP(ctx)
if err != nil {
return "", errors.Wrap(err, "unable to derive the IP value for host-gateway")
}
ip = hgip.String()
} else {
// If the address is enclosed in square brackets, extract it (for IPv6, but
// permit it for IPv4 as well; we don't know the address family here, but it's
// unambiguous).
if len(ip) > 2 && ip[0] == '[' && ip[len(ip)-1] == ']' {
ip = ip[1 : len(ip)-1]
}
if net.ParseIP(ip) == nil {
return "", errors.Errorf("invalid host %s", h)
}
}
hosts = append(hosts, host+"="+ip)
}
return strings.Join(hosts, ","), nil
}
// toBuildkitUlimits converts ulimits from docker type=soft:hard format to buildkit's csv format
func toBuildkitUlimits(inp *opts.UlimitOpt) (string, error) {
if inp == nil || len(inp.GetList()) == 0 {
return "", nil
}
ulimits := make([]string, 0, len(inp.GetList()))
for _, ulimit := range inp.GetList() {
ulimits = append(ulimits, ulimit.String())
}
return strings.Join(ulimits, ","), nil
}
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