Add dev nvidia with nv

CHANGELOG.md

@@ -17,6 +17,7 @@ and changes prior to that are (unfortunately) done retrospectively. Critical ite
  - Put /usr/local/{bin,sbin} in front of the default PATH
  - Adjustments to SCIF (Scientific Filesystem) integration for broader use
  - Fixed bug that did not export environment variables for apps with "-" in name
+ - Fix conflict between `--nv` and `--contain` options
 
 ## [v2.4.4](https://github.com/singularityware/singularity/tree/release-2.4)
 

libexec/cli/action_argparser.sh

@@ -123,6 +123,8 @@ while true; do
         ;;
         --nv)
             shift
+            SINGULARITY_NV=1
+            export SINGULARITY_NV
             SINGULARITY_NVLIBLIST=`mktemp ${TMPDIR:-/tmp}/.singularity-nvliblist.XXXXXXXX`
             cat $SINGULARITY_sysconfdir"/singularity/nvliblist.conf" | grep -Ev "^#|^\s*$" > $SINGULARITY_NVLIBLIST
             for i in $(ldconfig -p | grep -f "${SINGULARITY_NVLIBLIST}"); do
@@ -141,7 +143,7 @@ while true; do
             else
                 export SINGULARITY_CONTAINLIBS
             fi
-            if NVIDIA_SMI=$(which nvidia-smi); then
+            if NVIDIA_SMI=$(which nvidia-smi 2>/dev/null); then
                 if [ -n "${SINGULARITY_BINDPATH:-}" ]; then
                     SINGULARITY_BINDPATH="${SINGULARITY_BINDPATH},${NVIDIA_SMI}"
                 else

src/lib/runtime/mounts/dev/dev.c

@@ -31,6 +31,8 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <grp.h>
+#include <string.h>
+#include <dirent.h>
 
 #include "config.h"
 #include "util/file.h"
@@ -52,6 +54,7 @@ int _singularity_runtime_mount_dev(void) {
     if ( ( singularity_registry_get("CONTAIN") != NULL ) || ( strcmp("minimal", singularity_config_get_value(MOUNT_DEV)) == 0 ) ) {
         char *sessiondir = singularity_registry_get("SESSIONDIR");
         char *devdir = joinpath(sessiondir, "/dev");
+        char *nvopt = singularity_registry_get("NV"); 
 
         if ( is_dir(joinpath(container_dir, "/dev")) < 0 ) {
             int ret;
@@ -103,6 +106,26 @@ int _singularity_runtime_mount_dev(void) {
         bind_dev(sessiondir, "/dev/random");
         bind_dev(sessiondir, "/dev/urandom");
 
+        /* if the user passed the --nv flag and the --contain flag, still bind
+        nvidia devices */
+        if ( nvopt != NULL ) {
+            DIR *dir;
+            struct dirent *dp; 
+
+            if ( ( dir = opendir("/dev") ) == NULL ) {
+                singularity_message(ERROR, "Could not open /dev on host system");
+                ABORT(255);
+            }
+
+            while ( ( dp = readdir(dir) ) != NULL ) {
+                if ( strstr(dp->d_name, "nvidia") != NULL ) {
+                    bind_dev(sessiondir, joinpath("/dev", dp->d_name) );
+                }
+            }
+
+            closedir(dir);
+        }
+
         singularity_message(DEBUG, "Mounting tmpfs for staged /dev/shm\n");
         if ( singularity_mount("/dev/shm", joinpath(devdir, "/shm"), "tmpfs", MS_NOSUID, "") < 0 ) {
             singularity_message(ERROR, "Failed to mount %s: %s\n", joinpath(devdir, "/shm"), strerror(errno));