gnu: kmod: Honor $LINUX_MODULE_DIRECTORY.

* gnu/packages/patches/kmod-module-directory.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/linux.scm (kmod)[origin]: Use it.

1 files changed, 31 insertions, 0 deletions

diff --git a/gnu/packages/patches/kmod-module-directory.patch b/gnu/packages/patches/kmod-module-directory.patch
new file mode 100644
index 0000000000..b4b1a3b3db
--- /dev/null
+++ b/gnu/packages/patches/kmod-module-directory.patch
@@ -0,0 +1,31 @@
+This patch changes libkmod so it honors the 'LINUX_MODULE_DIRECTORY'
+environment variable, rather than looking for modules exclusively in
+/lib/modules.
+
+Patch by Shea Levy, from Nixpkgs; adjusted to use 'LINUX_MODULE_DIRECTORY'
+rather than 'MODULE_DIR' as the variable name.
+
+
+--- kmod-7/libkmod/libkmod.c	2012-03-15 08:19:16.750010226 -0400
++++ kmod-7/libkmod/libkmod.c	2012-04-04 15:21:29.532074313 -0400
+@@ -200,7 +200,7 @@
+ static char *get_kernel_release(const char *dirname)
+ {
+ 	struct utsname u;
+-	char *p;
++	char *p, *dirname_prefix;
+ 
+ 	if (dirname != NULL)
+ 		return path_make_absolute_cwd(dirname);
+@@ -208,7 +208,10 @@
+ 	if (uname(&u) < 0)
+ 		return NULL;
+ 
+-	if (asprintf(&p, "%s/%s", dirname_default_prefix, u.release) < 0)
++	if ((dirname_prefix = getenv("LINUX_MODULE_DIRECTORY")) == NULL)
++		dirname_prefix = dirname_default_prefix;
++
++	if (asprintf(&p, "%s/%s", dirname_prefix, u.release) < 0)
+ 		return NULL;
+ 
+ 	return p;