source: scripts/patches/udev-027-permissions-1.patch@ de1878b7

Submitted By: Jim Gifford (jim at linuxfromscratch dot org)
Date: 2004-06-21
Initial Package Version: 027
Origin: Jim Gifford and Zack Winkles
Upstream Status: N/A
Description: Reverts tweak node unlink handling
        http://linuxusb.bkbits.net:8080/udev/cset@1.759?nav=index.html|tags|ChangeSet@..1.7601

        Symptons of problem: When cron executes a bash script, /dev/null changes from the
        permissions lists in udev.rules to 600. This patch seems to correct the issue,
        I am submitting it as a temporary fix util a better fix can be found.

diff -Naur udev-027.orig/udev-add.c udev-027/udev-add.c
--- udev-027.orig/udev-add.c    2004-06-14 16:38:35.000000000 -0400
+++ udev-027/udev-add.c 2004-06-21 12:44:15.422138488 -0400
@@ -105,46 +105,29 @@
        return 0;
 }
 
-static int make_node(char *file, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
+static int make_node(char *filename, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
 {
-       struct stat stats;
-       int retval = 0;
-
-       if (stat(file, &stats) != 0)
-               goto create;
-
-       /* preserve node with already correct numbers, to not change the inode number */
-       if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) &&
-           (stats.st_rdev == makedev(major, minor))) {
-               dbg("preserve file '%s', cause it has correct dev_t", file);
-               goto perms;
-       }
-
-       if (unlink(file) != 0)
-               dbg("unlink(%s) failed with error '%s'", file, strerror(errno));
-       else
-               dbg("already present file '%s' unlinked", file);
+       int retval;
 
-create:
-       retval = mknod(file, mode, makedev(major, minor));
+       retval = mknod(filename, mode, makedev(major, minor));
        if (retval != 0) {
                dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
-                   file, mode, major, minor, strerror(errno));
+                   filename, mode, major, minor, strerror(errno));
                goto exit;
        }
 
-perms:
-       dbg("chmod(%s, %#o)", file, mode);
-       if (chmod(file, mode) != 0) {
-               dbg("chmod(%s, %#o) failed with error '%s'", file, mode, strerror(errno));
+       dbg("chmod(%s, %#o)", filename, mode);
+       if (chmod(filename, mode) != 0) {
+               dbg("chmod(%s, %#o) failed with error '%s'",
+                   filename, mode, strerror(errno));
                goto exit;
        }
 
        if (uid != 0 || gid != 0) {
-               dbg("chown(%s, %u, %u)", file, uid, gid);
-               if (chown(file, uid, gid) != 0) {
+               dbg("chown(%s, %u, %u)", filename, uid, gid);
+               if (chown(filename, uid, gid) != 0) {
                        dbg("chown(%s, %u, %u) failed with error '%s'",
-                           file, uid, gid, strerror(errno));
+                           filename, uid, gid, strerror(errno));
                        goto exit;
                }
        }
@@ -184,6 +167,23 @@
        endutent();
 }
 
+static int unlink_entry(char *filename)
+{
+       struct stat stats;
+       int retval = 0;
+       
+       if (lstat(filename, &stats) == 0) {
+               if ((stats.st_mode & S_IFMT) != S_IFDIR) {
+                       retval = unlink(filename);
+                       if (retval) {
+                               dbg("unlink(%s) failed with error '%s'",
+                                   filename, strerror(errno));
+                       }
+               }
+       }
+       return retval;
+}
+
 static int create_node(struct udevice *dev, int fake)
 {
        char filename[NAME_SIZE];
@@ -253,6 +253,7 @@
        }
 
        if (!fake) {
+               unlink_entry(filename);
                info("creating device node '%s'", filename);
                if (make_node(filename, dev->major, dev->minor, dev->mode, uid, gid) != 0)
                        goto error;
@@ -269,6 +270,7 @@
                        for (i = 1; i <= dev->partitions; i++) {
                                strfieldcpy(partitionname, filename);
                                strintcat(partitionname, i);
+                               unlink_entry(partitionname);
                                make_node(partitionname, dev->major,
                                          dev->minor + i, dev->mode, uid, gid);
                        }
@@ -302,9 +304,11 @@
 
                strfieldcat(linktarget, &dev->name[tail]);
 
+               if (!fake)
+                       unlink_entry(filename);
+
                dbg("symlink(%s, %s)", linktarget, filename);
                if (!fake) {
-                       unlink(filename);
                        if (symlink(linktarget, filename) != 0)
                                dbg("symlink(%s, %s) failed with error '%s'",
                                    linktarget, filename, strerror(errno));