MFC r263429

Fix kern/187712: config(8) does not respect KERNCONFDIR.
The impact of this bug is that you cannot build a kernel if both of the
following are true:
1) The kernel config file is in a non-default location
2) The kernel config file uses the "include" statement from config(5).

usr.sbin/config/main.c
usr.sbin/config/config.8
usr.sbin/config/config.h
usr.sbin/config/lang.l
	Added a "-I path" option to config(8).  By analogy to cc(1), it adds
	an extra path in which the "include" statement will search for
	files.

Makefile.inc1
        Pass "-I ${KERNCONFDIR}" to config(8).

1 files changed, 13 insertions, 0 deletions

diff --git a/usr.sbin/config/lang.l b/usr.sbin/config/lang.l
index 3e4e115..14fa7da 100644
--- a/usr.sbin/config/lang.l
+++ b/usr.sbin/config/lang.l
@@ -34,6 +34,7 @@
 #include <assert.h>
 #include <ctype.h>
 #include <err.h>
+#include <stdlib.h>
 #include <string.h>
 #include "y.tab.h"
 #include "config.h"
@@ -257,6 +258,7 @@ include(const char *fname, int ateof)
 {
 	FILE *fp;
 	struct incl *in;
+	struct includepath* ipath;
 	char *fnamebuf;
 
 	fnamebuf = NULL;
@@ -269,6 +271,17 @@ include(const char *fname, int ateof)
 		}
 	}
 	if (fp == NULL) {
+		SLIST_FOREACH(ipath, &includepath, path_next) {
+			asprintf(&fnamebuf, "%s/%s", ipath->path, fname);
+			if (fnamebuf != NULL) {
+				fp = fopen(fnamebuf, "r");
+				free(fnamebuf);
+			}
+			if (fp != NULL)
+				break;
+		}
+	}
+	if (fp == NULL) {
 		yyerror("cannot open included file");
 		return (-1);
 	}