[bug-mailutils] can't save on vfat on Linux

[Dan Jacobson]

On a flash card mounted as
/dev/sdb1 /mnt/usb/cf vfat 
noauto,noatime,user,fmask=133,uid=jidanni,gid=jidanni 0 0
one gets
& s qqq
Cannot append message: Operation not permitted
$ ls -l
-rw-r--r-- 1 jidanni jidanni     0 2006-09-13 12:22 qqq

strace shows:
open("/mnt/usb/cf/tojidanni1/iiiii.lock", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No 
such file or directory)
uname({sys="Linux", node="jidanni2", ...}) = 0
time(NULL)                              = 1158121434
open("/mnt/usb/cf/tojidanni1/iiiii.7125.1158121434.jidanni2", 
O_WRONLY|O_CREAT|O_EXCL|O_LARGEFILE, 0644) = 6
close(6)                                = 0
link("/mnt/usb/cf/tojidanni1/iiiii.7125.1158121434.jidanni2", 
"/mnt/usb/cf/tojidanni1/iiiii.lock") = -1 EPERM (Operation not permitted)
unlink("/mnt/usb/cf/tojidanni1/iiiii.7125.1158121434.jidanni2") = 0
write(2, "Cannot append message: Operation"..., 46Cannot append message: 
Operation not permitted) = 46

1. give a more precise error message.
2. maybe you assume sys=Linux so the filesystem won't be vfat?