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podman.go
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podman.go
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package authprovider
import (
"fmt"
"io"
"io/fs"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/docker/cli/cli/config"
"github.com/docker/cli/cli/config/configfile"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/session/auth/authprovider"
"github.com/pkg/errors"
)
const (
dockerDockerhubKey = "https://index.docker.io/v1/"
podmanDockerhubKey = "docker.io"
podmanAuthFile = "auth.json"
)
// OS contains methods that are similar to the os package functions. It is
// provided so that os-level functions may be mocked.
type OS interface {
Open(string) (io.ReadCloser, error)
Getenv(string) string
}
type defaultOS struct{}
func (o defaultOS) Open(path string) (io.ReadCloser, error) {
return os.Open(path)
}
func (o defaultOS) Getenv(name string) string {
return os.Getenv(name)
}
type podmanCfg struct {
os OS
}
// PodmanOpt is an option which may be used when constructing a podman auth
// provider.
type PodmanOpt func(podmanCfg) podmanCfg
// WithOS returns an option that provides custom OS-level functions for the
// podman auth provider to use.
func WithOS(o OS) PodmanOpt {
return func(c podmanCfg) podmanCfg {
c.os = o
return c
}
}
func NewPodman(stderr io.Writer, opts ...PodmanOpt) session.Attachable {
conf := podmanCfg{
os: defaultOS{},
}
for _, o := range opts {
conf = o(conf)
}
if authfile := conf.os.Getenv("REGISTRY_AUTH_FILE"); authfile != "" {
cfg, err := podmanAuth(conf.os, authfile)
if err != nil {
fmt.Fprintf(stderr, "WARNING: Error loading config file: %v\n", err)
return authprovider.NewDockerAuthProvider(cfg, nil)
}
syncDockerKey(cfg)
return authprovider.NewDockerAuthProvider(cfg, nil)
}
xdgRuntime := conf.os.Getenv("XDG_RUNTIME_DIR")
if xdgRuntime == "" {
idCmd := exec.Command("id", "-u")
out, err := idCmd.CombinedOutput()
if err != nil {
return authprovider.NewDockerAuthProvider(config.LoadDefaultConfigFile(stderr), nil)
}
id := strings.TrimSpace(string(out))
// TODO: figure out how podman finds this path - on first pass we
// couldn't find a good location for it.
path := filepath.Join("/run", "containers", id, "auth.json")
cfg, err := podmanAuth(conf.os, path)
if errors.Is(err, fs.ErrNotExist) {
return authprovider.NewDockerAuthProvider(config.LoadDefaultConfigFile(stderr), nil)
}
if err != nil {
fmt.Fprintf(stderr, "WARNING: Error loading config file: %v\n", err)
return authprovider.NewDockerAuthProvider(cfg, nil)
}
syncDockerKey(cfg)
return authprovider.NewDockerAuthProvider(cfg, nil)
}
path := filepath.Join(xdgRuntime, "containers", podmanAuthFile)
cfg, err := podmanAuth(conf.os, path)
if errors.Is(err, fs.ErrNotExist) {
return authprovider.NewDockerAuthProvider(config.LoadDefaultConfigFile(stderr), nil)
}
if err != nil {
fmt.Fprintf(stderr, "WARNING: Error loading config file: %v\n", err)
return authprovider.NewDockerAuthProvider(cfg, nil)
}
syncDockerKey(cfg)
return authprovider.NewDockerAuthProvider(cfg, nil)
}
func podmanAuth(o OS, path string) (*configfile.ConfigFile, error) {
f, err := o.Open(path)
cfg := configfile.New(path)
if err != nil {
return cfg, errors.Wrap(err, path)
}
defer f.Close()
if err := cfg.LoadFromReader(f); err != nil {
return cfg, errors.Wrap(err, path)
}
return cfg, nil
}
func syncDockerKey(cfg *configfile.ConfigFile) {
if _, ok := cfg.AuthConfigs[dockerDockerhubKey]; ok {
return
}
v, ok := cfg.AuthConfigs[podmanDockerhubKey]
if !ok {
return
}
cfg.AuthConfigs[dockerDockerhubKey] = v
}