// Copyright (C) The Arvados Authors. All rights reserved. // // SPDX-License-Identifier: AGPL-3.0 package crunchrun import ( "io/ioutil" "os" "os/exec" "syscall" "golang.org/x/net/context" ) type singularityExecutor struct { logf func(string, ...interface{}) spec containerSpec tmpdir string child *exec.Cmd imageFilename string // "sif" image } func newSingularityExecutor(logf func(string, ...interface{})) (*singularityExecutor, error) { tmpdir, err := ioutil.TempDir("", "crunch-run-singularity-") if err != nil { return nil, err } return &singularityExecutor{ logf: logf, tmpdir: tmpdir, }, nil } func (e *singularityExecutor) ImageLoaded(string) bool { return false } // LoadImage will satisfy ContainerExecuter interface transforming // containerImage into a sif file for later use. func (e *singularityExecutor) LoadImage(imageTarballPath string) error { e.logf("building singularity image") // "singularity build" does not accept a // docker-archive://... filename containing a ":" character, // as in "/path/to/sha256:abcd...1234.tar". Workaround: make a // symlink that doesn't have ":" chars. err := os.Symlink(imageTarballPath, e.tmpdir+"/image.tar") if err != nil { return err } e.imageFilename = e.tmpdir + "/image.sif" build := exec.Command("singularity", "build", e.imageFilename, "docker-archive://"+e.tmpdir+"/image.tar") e.logf("%v", build.Args) out, err := build.CombinedOutput() // INFO: Starting build... // Getting image source signatures // Copying blob ab15617702de done // Copying config 651e02b8a2 done // Writing manifest to image destination // Storing signatures // 2021/04/22 14:42:14 info unpack layer: sha256:21cbfd3a344c52b197b9fa36091e66d9cbe52232703ff78d44734f85abb7ccd3 // INFO: Creating SIF file... // INFO: Build complete: arvados-jobs.latest.sif e.logf("%s", out) if err != nil { return err } return nil } func (e *singularityExecutor) Create(spec containerSpec) error { e.spec = spec return nil } func (e *singularityExecutor) Start() error { args := []string{"singularity", "exec", "--containall", "--no-home", "--cleanenv", "--pwd", e.spec.WorkingDir} if !e.spec.EnableNetwork { args = append(args, "--net", "--network=none") } readonlyflag := map[bool]string{ false: "rw", true: "ro", } for path, mount := range e.spec.BindMounts { args = append(args, "--bind", mount.HostPath+":"+path+":"+readonlyflag[mount.ReadOnly]) } args = append(args, e.imageFilename) args = append(args, e.spec.Command...) // This is for singularity 3.5.2. There are some behaviors // that will change in singularity 3.6, please see: // https://sylabs.io/guides/3.7/user-guide/environment_and_metadata.html // https://sylabs.io/guides/3.5/user-guide/environment_and_metadata.html env := make([]string, 0, len(e.spec.Env)) for k, v := range e.spec.Env { env = append(env, "SINGULARITYENV_"+k+"="+v) } path, err := exec.LookPath(args[0]) if err != nil { return err } child := &exec.Cmd{ Path: path, Args: args, Env: env, Stdin: e.spec.Stdin, Stdout: e.spec.Stdout, Stderr: e.spec.Stderr, } err = child.Start() if err != nil { return err } e.child = child return nil } func (e *singularityExecutor) CgroupID() string { return "" } func (e *singularityExecutor) Stop() error { if err := e.child.Process.Signal(syscall.Signal(0)); err != nil { // process already exited return nil } return e.child.Process.Signal(syscall.SIGKILL) } func (e *singularityExecutor) Wait(context.Context) (int, error) { err := e.child.Wait() if err, ok := err.(*exec.ExitError); ok { return err.ProcessState.ExitCode(), nil } if err != nil { return 0, err } return e.child.ProcessState.ExitCode(), nil } func (e *singularityExecutor) Close() { err := os.RemoveAll(e.tmpdir) if err != nil { e.logf("error removing temp dir: %s", err) } }