nss-path.patch

diff -ru -x '*~' glibc-2.32-orig/nss/nsswitch.c glibc-2.32/nss/nsswitch.c
--- glibc-2.32-orig/nss/nsswitch.c	2020-08-05 04:17:00.000000000 +0200
+++ glibc-2.32/nss/nsswitch.c	2021-01-29 19:40:50.730883061 +0100
@@ -349,6 +349,35 @@
 		__nss_shlib_revision);
 
       ni->library->lib_handle = __libc_dlopen (shlib_name);
+
+      if (ni->library->lib_handle == NULL)
+	{
+	  const char *nss_path = __libc_secure_getenv ("NIX_GLIBC_NSS_PATH");
+	  if (!nss_path)
+	    nss_path = DEFAULT_NSS_PATH;
+
+	  const char *pos = nss_path;
+
+	  while (*pos)
+	    {
+	      const char *end = __strchrnul(pos, ':');
+	      if (pos != end)
+		{
+		  char shlib_path[1024];
+		  size_t shlib_pathlen = (end - pos) + 1 + strlen (shlib_name) + 1;
+		  if (shlib_pathlen < sizeof(shlib_path))
+		    {
+		      __stpcpy (__stpcpy (__stpncpy (shlib_path, pos, end - pos), "/"), shlib_name);
+		      ni->library->lib_handle = __libc_dlopen (shlib_path);
+		      if (ni->library->lib_handle != NULL)
+			break;
+		    }
+		  if (!*end) break;
+		  pos = end + 1;
+		}
+	    }
+	}
+
       if (ni->library->lib_handle == NULL)
 	{
 	  /* Failed to load the library.  */
diff -ru -x '*~' glibc-2.32-orig/sysdeps/generic/unsecvars.h glibc-2.32/sysdeps/generic/unsecvars.h
--- glibc-2.32-orig/sysdeps/generic/unsecvars.h	2020-08-05 04:17:00.000000000 +0200
+++ glibc-2.32/sysdeps/generic/unsecvars.h	2021-01-29 15:38:37.067684060 +0100
@@ -27,6 +27,7 @@
   "LOCPATH\0"								      \
   "MALLOC_TRACE\0"							      \
   "NIS_PATH\0"								      \
+  "NIX_GLIBC_NSS_PATH\0"						      \
   "NLSPATH\0"								      \
   "RESOLV_HOST_CONF\0"							      \
   "RES_OPTIONS\0"							      \