nixpkgs/pkgs/applications/virtualization/singularity/apptainer/0001-ldCache-patch-for-driverLink.patch

From 783ec26c0d83013baf04579a6a415d7f8776ac93 Mon Sep 17 00:00:00 2001
From: Someone Serge <sergei.kozlukov@aalto.fi>
Date: Sun, 7 Jan 2024 11:48:24 +0000
Subject: [PATCH] ldCache(): patch for @driverLink@

---
 internal/pkg/util/paths/resolve.go | 41 +++++++++++++++++++++++++++---
 1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/internal/pkg/util/paths/resolve.go b/internal/pkg/util/paths/resolve.go
index db45d9db1..9d0110b6b 100644
--- a/internal/pkg/util/paths/resolve.go
+++ b/internal/pkg/util/paths/resolve.go
@@ -14,6 +14,7 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"path"
 	"path/filepath"
 	"regexp"
 	"strings"
@@ -154,14 +155,49 @@ func Resolve(fileList []string) ([]string, []string, error) {
 // lists three variants of libEGL.so.1 that are in different locations, we only
 // report the first, highest priority, variant.
 func ldCache() (map[string]string, error) {
+    driverDirs := strings.Split("@driverLink@/lib", ":")
+    if machine, err := elfMachine(); err == nil && machine == elf.EM_386 {
+        driverDirs = strings.Split("@driverLink@-32/lib", ":")
+    }
+
+    soPattern, err := regexp.Compile(`[^\s]+\.so(\.\d+(\.\d+(\.\d+)?)?)?$`)
+    if err != nil {
+		return nil, fmt.Errorf("could not compile ldconfig regexp: %v", err)
+    }
+
+	ldCache := make(map[string]string)
+    for _, dirPath := range driverDirs {
+        dir, err := os.Open(dirPath)
+        if err != nil {
+            /* Maybe we're not running under NixOS */
+            continue
+        }
+        files, err := dir.ReadDir(-1)
+        if err != nil {
+            continue
+        }
+        for _, f := range files {
+            if !soPattern.MatchString(f.Name()) {
+                continue
+            }
+            libName := f.Name()
+            libPath := path.Join(dirPath, f.Name())
+			if _, ok := ldCache[libName]; !ok {
+				ldCache[libName] = libPath
+			}
+        }
+    }
+
 	// walk through the ldconfig output and add entries which contain the filenames
 	// returned by nvidia-container-cli OR the nvliblist.conf file contents
 	ldconfig, err := bin.FindBin("ldconfig")
-	if err != nil {
+	if err != nil && len(ldCache) == 0 {
+        // Note that missing ldconfig is only an "error" as long
+        // as there's no driverLink
 		return nil, err
 	}
 	out, err := exec.Command(ldconfig, "-p").Output()
-	if err != nil {
+	if err != nil && len(ldCache) == 0 {
 		return nil, fmt.Errorf("could not execute ldconfig: %v", err)
 	}
 
@@ -173,7 +209,6 @@ func ldCache() (map[string]string, error) {
 	}
 
 	// store library name with associated path
-	ldCache := make(map[string]string)
 	for _, match := range r.FindAllSubmatch(out, -1) {
 		if match != nil {
 			// libName is the "libnvidia-ml.so.1" (from the above example)
-- 
2.42.0