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dagger/plan/task/exec.go

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package task
import (
"context"
"errors"
"fmt"
"net"
"strings"
"github.com/moby/buildkit/client/llb"
"go.dagger.io/dagger/compiler"
"go.dagger.io/dagger/plancontext"
"go.dagger.io/dagger/solver"
)
func init() {
Register("Exec", func() Task { return &execTask{} })
}
type execTask struct {
}
func (t execTask) Run(ctx context.Context, pctx *plancontext.Context, s solver.Solver, v *compiler.Value) (*compiler.Value, error) {
// Get input state
input, err := pctx.FS.FromValue(v.Lookup("input"))
if err != nil {
return nil, err
}
st, err := input.State()
if err != nil {
return nil, err
}
// Run
opts, err := t.getRunOpts(v, pctx)
if err != nil {
return nil, err
}
st = st.Run(opts...).Root()
// Solve
result, err := s.Solve(ctx, st, pctx.Platform.Get())
if err != nil {
return nil, err
}
// Fill result
fs := pctx.FS.New(result)
return compiler.NewValue().FillFields(map[string]interface{}{
"output": fs.MarshalCUE(),
"exit": 0,
})
}
func (t execTask) getRunOpts(v *compiler.Value, pctx *plancontext.Context) ([]llb.RunOption, error) {
opts := []llb.RunOption{}
var cmd struct {
Args []string
Always bool
}
if err := v.Decode(&cmd); err != nil {
return nil, err
}
// args
opts = append(opts, llb.Args(cmd.Args))
// workdir
workdir, err := v.Lookup("workdir").String()
if err != nil {
return nil, err
}
opts = append(opts, llb.Dir(workdir))
// env
envs, err := v.Lookup("env").Fields()
if err != nil {
return nil, err
}
for _, env := range envs {
if plancontext.IsSecretValue(env.Value) {
secret, err := pctx.Secrets.FromValue(env.Value)
if err != nil {
return nil, err
}
opts = append(opts, llb.AddSecret(env.Label(), llb.SecretID(secret.ID()), llb.SecretAsEnv(true)))
} else {
s, err := env.Value.String()
if err != nil {
return nil, err
}
opts = append(opts, llb.AddEnv(env.Label(), s))
}
}
// always?
if cmd.Always {
// FIXME: also disables persistent cache directories
// There's an ongoing proposal that would fix this: https://github.com/moby/buildkit/issues/1213
opts = append(opts, llb.IgnoreCache)
}
hosts, err := v.Lookup("hosts").Fields()
if err != nil {
return nil, err
}
for _, host := range hosts {
s, err := host.Value.String()
if err != nil {
return nil, err
}
if err != nil {
return nil, err
}
opts = append(opts, llb.AddExtraHost(host.Label(), net.ParseIP(s)))
}
user, err := v.Lookup("user").String()
if err != nil {
return nil, err
}
opts = append(opts, llb.User(user))
// mounts
mntOpts, err := t.mountAll(pctx, v.Lookup("mounts"))
if err != nil {
return nil, err
}
opts = append(opts, mntOpts...)
// marker for status events
// FIXME
args := make([]string, 0, len(cmd.Args))
for _, a := range cmd.Args {
args = append(args, fmt.Sprintf("%q", a))
}
opts = append(opts, withCustomName(v, "Exec [%s]", strings.Join(args, ", ")))
return opts, nil
}
func (t execTask) mountAll(pctx *plancontext.Context, mounts *compiler.Value) ([]llb.RunOption, error) {
opts := []llb.RunOption{}
fields, err := mounts.Fields()
if err != nil {
return nil, err
}
for _, mnt := range fields {
if mnt.Value.Lookup("dest").IsConcreteR() != nil {
return nil, fmt.Errorf("mount %q is not concrete", mnt.Selector.String())
}
dest, err := mnt.Value.Lookup("dest").String()
if err != nil {
return nil, err
}
o, err := t.mount(pctx, dest, mnt.Value)
if err != nil {
return nil, err
}
opts = append(opts, o)
}
return opts, err
}
func (t execTask) mount(pctx *plancontext.Context, dest string, mnt *compiler.Value) (llb.RunOption, error) {
typ, err := mnt.Lookup("type").String()
if err != nil {
return nil, err
}
switch typ {
case "cache":
return t.mountCache(pctx, dest, mnt)
case "tmp":
return t.mountTmp(pctx, dest, mnt)
case "service":
return t.mountService(pctx, dest, mnt)
case "fs":
return t.mountFS(pctx, dest, mnt)
case "secret":
return t.mountSecret(pctx, dest, mnt)
case "":
return nil, errors.New("no mount type specified")
default:
return nil, fmt.Errorf("unsupported mount type %q", typ)
}
}
func (t *execTask) mountTmp(_ *plancontext.Context, dest string, _ *compiler.Value) (llb.RunOption, error) {
// FIXME: handle size
return llb.AddMount(
dest,
llb.Scratch(),
llb.Tmpfs(),
), nil
}
func (t *execTask) mountCache(_ *plancontext.Context, dest string, mnt *compiler.Value) (llb.RunOption, error) {
contents := mnt.Lookup("contents")
idValue := contents.Lookup("id")
if !idValue.IsConcrete() {
return nil, fmt.Errorf("cache %q is not set", mnt.Path().String())
}
id, err := idValue.String()
if err != nil {
return nil, err
}
concurrency, err := contents.Lookup("concurrency").String()
if err != nil {
return nil, err
}
var mode llb.CacheMountSharingMode
switch concurrency {
case "shared":
mode = llb.CacheMountShared
case "private":
mode = llb.CacheMountPrivate
case "locked":
mode = llb.CacheMountLocked
default:
return nil, fmt.Errorf("unknown concurrency mode %q", concurrency)
}
return llb.AddMount(
dest,
llb.Scratch(),
llb.AsPersistentCacheDir(
id,
mode,
),
), nil
}
func (t *execTask) mountFS(pctx *plancontext.Context, dest string, mnt *compiler.Value) (llb.RunOption, error) {
contents, err := pctx.FS.FromValue(mnt.Lookup("contents"))
if err != nil {
return nil, err
}
// possibly construct mount options for LLB from
var mo []llb.MountOption
// handle "path" option
if source := mnt.Lookup("source"); source.Exists() {
src, err := source.String()
if err != nil {
return nil, err
}
mo = append(mo, llb.SourcePath(src))
}
if ro := mnt.Lookup("ro"); ro.Exists() {
readonly, err := ro.Bool()
if err != nil {
return nil, err
}
if readonly {
mo = append(mo, llb.Readonly)
}
}
st, err := contents.State()
if err != nil {
return nil, err
}
return llb.AddMount(dest, st, mo...), nil
}
func (t *execTask) mountSecret(pctx *plancontext.Context, dest string, mnt *compiler.Value) (llb.RunOption, error) {
contents, err := pctx.Secrets.FromValue(mnt.Lookup("contents"))
if err != nil {
return nil, err
}
opts := struct {
UID int
GID int
Mask int
}{}
if err := mnt.Decode(&opts); err != nil {
return nil, err
}
return llb.AddSecret(dest,
llb.SecretID(contents.ID()),
llb.SecretFileOpt(opts.UID, opts.GID, opts.Mask),
), nil
}
func (t *execTask) mountService(pctx *plancontext.Context, dest string, mnt *compiler.Value) (llb.RunOption, error) {
contents, err := pctx.Services.FromValue(mnt.Lookup("contents"))
if err != nil {
return nil, err
}
return llb.AddSSHSocket(
llb.SSHID(contents.ID()),
llb.SSHSocketTarget(dest),
), nil
}