19081: Disable singularity env var eval behavior if possible.

[arvados.git] / lib / crunchrun / singularity.go

diff --git a/lib/crunchrun/singularity.go b/lib/crunchrun/singularity.go
index 5af023a83dc2dc61506818c88ccfadc5b0c22514..61992b312dac8cf3f0757523419b771bf4e6b34e 100644 (file)
--- a/lib/crunchrun/singularity.go
+++ b/lib/crunchrun/singularity.go
@@ -241,11 +241,16 @@ func (e *singularityExecutor) Create(spec containerSpec) error {
        return nil
 }
 
-func (e *singularityExecutor) Start() error {
-       args := []string{"singularity", "exec", "--containall", "--cleanenv", "--pwd", e.spec.WorkingDir}
+func (e *singularityExecutor) execCmd(path string) *exec.Cmd {
+       args := []string{path, "exec", "--containall", "--cleanenv", "--pwd", e.spec.WorkingDir}
        if !e.spec.EnableNetwork {
                args = append(args, "--net", "--network=none")
        }
+
+       if e.spec.CUDADeviceCount != 0 {
+               args = append(args, "--nv")
+       }
+
        readonlyflag := map[bool]string{
                false: "rw",
                true:  "ro",
@@ -279,14 +284,27 @@ func (e *singularityExecutor) Start() error {
                env = append(env, "SINGULARITYENV_"+k+"="+v)
        }
 
+       // Singularity always makes all nvidia devices visible to the
+       // container.  If a resource manager such as slurm or LSF told
+       // us to select specific devices we need to propagate that.
+       if cudaVisibleDevices := os.Getenv("CUDA_VISIBLE_DEVICES"); cudaVisibleDevices != "" {
+               // If a resource manager such as slurm or LSF told
+               // us to select specific devices we need to propagate that.
+               env = append(env, "SINGULARITYENV_CUDA_VISIBLE_DEVICES="+cudaVisibleDevices)
+       }
+       // Singularity's default behavior is to evaluate each
+       // SINGULARITYENV_* env var with a shell as a double-quoted
+       // string and pass the result to the contained
+       // process. Singularity 3.10+ has an option to pass env vars
+       // through literally without evaluating, which is what we
+       // want. See https://github.com/sylabs/singularity/pull/704
+       // and https://dev.arvados.org/issues/19081
+       env = append(env, "SINGULARITY_NO_EVAL=1")
+
        args = append(args, e.imageFilename)
        args = append(args, e.spec.Command...)
 
-       path, err := exec.LookPath(args[0])
-       if err != nil {
-               return err
-       }
-       child := &exec.Cmd{
+       return &exec.Cmd{
                Path:   path,
                Args:   args,
                Env:    env,
@@ -294,6 +312,14 @@ func (e *singularityExecutor) Start() error {
                Stdout: e.spec.Stdout,
                Stderr: e.spec.Stderr,
        }
+}
+
+func (e *singularityExecutor) Start() error {
+       path, err := exec.LookPath("singularity")
+       if err != nil {
+               return err
+       }
+       child := e.execCmd(path)
        err = child.Start()
        if err != nil {
                return err