makedevs: Fix issue when rootdir of / is given

Treating rootdir "/" as "" leads an error in parse_devtable(). Preserve
it as it is given and use a separate variable for path name prepending.
Another minor fix is to add a return statement at the end of
convert2guid() to avoid an error with -Werror=return-type.

(From OE-Core rev: 4d52e6276c687a8950bde21850072ddf14893fb2)

Signed-off-by: Jaeyoon Jung <jaeyoon.jung@lge.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 12 insertions, 9 deletions

diff --git a/meta/recipes-devtools/makedevs/makedevs/makedevs.c b/meta/recipes-devtools/makedevs/makedevs/makedevs.c
index df2e3cfad5..2254b54891 100644
--- a/meta/recipes-devtools/makedevs/makedevs/makedevs.c
+++ b/meta/recipes-devtools/makedevs/makedevs/makedevs.c
@@ -36,6 +36,7 @@ static const char *const app_name = "makedevs";
 static const char *const memory_exhausted = "memory exhausted";
 static char default_rootdir[]=".";
 static char *rootdir = default_rootdir;
+static char *rootdir_prepend = default_rootdir;
 static int trace = 0;
 
 struct name_id {
@@ -217,6 +218,9 @@ static unsigned long convert2guid(char *id_buf, struct name_id *search_list)
                 }
                 error_msg_and_die("No entry for %s in search list", id_buf);
         }
+
+        // Unreachable, but avoid an error with -Werror=return-type
+        return 0;
 }
 
 static void free_list(struct name_id *list)
@@ -379,8 +383,8 @@ static int interpret_table_entry(char *line)
                 error_msg_and_die("Device table entries require absolute paths");
         }
         name = xstrdup(path + 1);
-        /* prefix path with rootdir */
-        sprintf(path, "%s/%s", rootdir, name);
+        /* prefix path with rootdir_prepend */
+        sprintf(path, "%s/%s", rootdir_prepend, name);
 
         /* XXX Why is name passed into all of the add_new_*() routines? */
         switch (type) {
@@ -406,11 +410,11 @@ static int interpret_table_entry(char *line)
 
                         for (i = start; i < start + count; i++) {
                                 sprintf(buf, "%s%d", name, i);
-                                sprintf(path, "%s/%s%d", rootdir, name, i);
+                                sprintf(path, "%s/%s%d", rootdir_prepend, name, i);
                                 /* FIXME:  MKDEV uses illicit insider knowledge of kernel
                                  * major/minor representation...  */
                                 rdev = MKDEV(major, minor + (i - start) * increment);
-                                sprintf(path, "%s/%s\0", rootdir, buf);
+                                sprintf(path, "%s/%s\0", rootdir_prepend, buf);
                                 add_new_device(buf, path, uid, gid, mode, rdev);
                         }
                 } else {
@@ -541,12 +545,11 @@ int main(int argc, char **argv)
                         } else {
                                 closedir(dir);
                         }
-                        /* If "/" is specified, use "" because rootdir is always prepended to a
-                         * string that starts with "/" */
-                        if (0 == strcmp(optarg, "/"))
-                                rootdir = xstrdup("");
+                        rootdir = xstrdup(optarg);
+                        if (0 == strcmp(rootdir, "/"))
+                                rootdir_prepend = xstrdup("");
                         else
-                                rootdir = xstrdup(optarg);
+                                rootdir_prepend = xstrdup(rootdir);
                         break;
 
                 case 't':