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 and Eelco Dolstra, 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;

--- kmod-17/tools/static-nodes.c	2013-12-17 22:05:42.159047316 +0100
+++ kmod-17/tools/static-nodes.c	2014-04-17 13:51:17.945974320 +0200
@@ -159,6 +159,7 @@
 	FILE *in = NULL, *out = NULL;
 	const struct static_nodes_format *format = &static_nodes_format_human;
 	int r, ret = EXIT_SUCCESS;
+	char *dirname_prefix;
 
 	for (;;) {
 		int c, idx = 0, valid;
@@ -211,16 +212,19 @@
 		goto finish;
 	}
 
-	snprintf(modules, sizeof(modules), "/lib/modules/%s/modules.devname", kernel.release);
+	if ((dirname_prefix = getenv("LINUX_MODULE_DIRECTORY")) == NULL)
+		dirname_prefix = "/lib/modules";
+
+	snprintf(modules, sizeof(modules), "%s/%s/modules.devname", dirname_prefix, kernel.release);
 	in = fopen(modules, "re");
 	if (in == NULL) {
 		if (errno == ENOENT) {
-			fprintf(stderr, "Warning: /lib/modules/%s/modules.devname not found - ignoring\n",
-				kernel.release);
+			fprintf(stderr, "Warning: %s/%s/modules.devname not found - ignoring\n",
+				dirname_prefix, kernel.release);
 			ret = EXIT_SUCCESS;
 		} else {
-			fprintf(stderr, "Error: could not open /lib/modules/%s/modules.devname - %m\n",
-				kernel.release);
+			fprintf(stderr, "Error: could not open %s/%s/modules.devname - %m\n",
+				dirname_prefix, kernel.release);
 			ret = EXIT_FAILURE;
 		}
 		goto finish;
fbba8d3feb31e606856efb971d1a20da73e1'>bootloader</a>/<a href='/guix/log/gnu/bootloader/u-boot.scm?id=039dfbba8d3feb31e606856efb971d1a20da73e1'>u-boot.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/bootloader/u-boot.scm?id=039dfbba8d3feb31e606856efb971d1a20da73e1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-05-22 11:15:30 +0800'>2024-05-22</span></td><td><a href='/guix/commit/gnu/bootloader/u-boot.scm?id=c7aec90a916a99067fd9915337caf098ee8e5083'>bootloader: Add u-boot-starfive-visionfive2-bootloader.</a><span class='msg-avail'>...</span></td><td>Zheng Junjie</td></tr>
<tr><td><span title='2024-03-31 22:26:21 +0200'>2024-03-31</span></td><td><a href='/guix/commit/gnu/bootloader/u-boot.scm?id=64187b65d3acb13b91dd83fc8e7209c8ef538078'>bootloader: Add u-boot-qemu-riscv64-bootloader.</a><span class='msg-avail'>...</span></td><td>Zheng Junjie</td></tr>
<tr><td><span title='2023-12-22 16:06:03 -0800'>2023-12-22</span></td><td><a href='/guix/commit/gnu/bootloader/u-boot.scm?id=88fb95903c1d94b3be7e8a811d943af988041e4e'>gnu: bootloader: Add orangepi-r1-plus-lts-rk3328 bootloader.</a><span class='msg-avail'>...</span></td><td>Herman Rimm</td></tr>
<tr><td><span title='2023-06-14 14:52:21 +0300'>2023-06-14</span></td><td><a href='/guix/commit/gnu/bootloader/u-boot.scm?id=39250fc6229d60b7ae397749caf1e4c99e49b419'>gnu: bootloader: Add u-boot-sifive-unmatched-bootloader.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2023-01-18 21:25:25 -0500'>2023-01-18</span></td><td><a href='/guix/commit/gnu/bootloader/u-boot.scm?id=9530ee9f9c89cbbf35589727e9fdb373ed7f47fa'>gnu: Add u-boot-ts7970-q-2g-1000mhz-c-bootloader.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-12-28 22:14:16 -0500'>2022-12-28</span></td><td><a href='/guix/commit/gnu/bootloader/u-boot.scm?id=d6ea9f8b38df7de1194d8106488a8c33cce64fd1'>gnu: u-boot-am335x-boneblack: Revert to old name.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-12-20 21:29:25 -0500'>2022-12-20</span></td><td><a href='/guix/commit/gnu/bootloader/u-boot.scm?id=c04528d2a2597d79278833f3607c806278253446'>gnu: u-boot-am335x-evm-boneblack: Fix variable name.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>