[PATCH] uml: search from uml_net in a more reasonable PATH

Append /usr/lib/uml to the existing PATH environment variable to let execvp()
search uml_net in FHS compliant locations.

Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
index 2878e89a674f..3a0ac38e978b 100644
--- a/arch/um/os-Linux/main.c
+++ b/arch/um/os-Linux/main.c
@@ -74,6 +74,34 @@ static void last_ditch_exit(int sig)
         exit(1);
 }
 
+#define UML_LIB_PATH    ":/usr/lib/uml"
+
+static void setup_env_path(void)
+{
+        char *new_path = NULL;
+        char *old_path = NULL;
+        int path_len = 0;
+
+        old_path = getenv("PATH");
+        /* if no PATH variable is set or it has an empty value
+         * just use the default + /usr/lib/uml
+         */
+        if (!old_path || (path_len = strlen(old_path)) == 0) {
+                putenv("PATH=:/bin:/usr/bin/" UML_LIB_PATH);
+                return;
+        }
+
+        /* append /usr/lib/uml to the existing path */
+        path_len += strlen("PATH=" UML_LIB_PATH) + 1;
+        new_path = malloc(path_len);
+        if (!new_path) {
+                perror("coudn't malloc to set a new PATH");
+                return;
+        }
+        snprintf(new_path, path_len, "PATH=%s" UML_LIB_PATH, old_path);
+        putenv(new_path);
+}
+
 extern int uml_exitcode;
 
 extern void scan_elf_aux( char **envp);
@@ -114,6 +142,8 @@ int main(int argc, char **argv, char **envp)
 
         set_stklim();
 
+        setup_env_path();
+
         new_argv = malloc((argc + 1) * sizeof(char *));
         if(new_argv == NULL){
                 perror("Mallocing argv");