[MiNT] [PATCH] symlink attributes on ramfs

[Vincent Rivière <vincent.riviere@freesbee.fr>]

Hello.

Some people noticed that tar 1.26 was unable to create an archive from 
symlinks stored on FreeMiNT's ramdisk. It failed with "Range error".

After investigation, this problem comes from tar's src/create.c, in function 
dump_file0():
      size_t linklen = st->stat.st_size;
      ...
      buffer = (char *) alloca (linklen + 1);
      size = readlinkat (parentfd, name, buffer, linklen + 1);

Actually, stat.st_size was always 0 for symlinks stored on /ram, while it 
should be the length of the target. This can be easily verified using the ls 
-l command and looking at the size of the symlinks.

Additionally, the permissions of the ramdisk symlinks were l--------- while 
they should be lrwxrwxrwx. There was no trouble with that, but this was ugly.

I fixed both issues.

Alan or Helmut, please commit in the FreeMiNT tree!

statram.patch
Fixed file size and permissions of symlinks stored on ramfs. Contributed by 
Vincent Riviere.

--
Vincent Rivière

diff -x CVS -aurN freemint.orig/sys/ramfs.c freemint/sys/ramfs.c
--- freemint.orig/sys/ramfs.c	2011-05-01 16:43:17.000000000 +0200
+++ freemint/sys/ramfs.c	2011-12-09 00:38:22.625000000 +0100
@@ -1672,7 +1672,7 @@
 	if (IS_IMMUTABLE (c))
 		return EACCES;
 
-	r = __creat (c, name, &new, S_IFLNK, 0);
+	r = __creat (c, name, &new, 0777 | S_IFLNK, 0);
 	if (r == E_OK)
 	{
 		ushort len = strlen (to) + 1;
@@ -1682,6 +1682,7 @@
 		if (new->data.symlnk.name)
 		{
 			strcpy (new->data.symlnk.name, to);
+			new->stat.size = len - 1;
 		}
 		else
 		{