> > >**Original Message** >From: Ryan <[EMAIL PROTECTED]> >To: [EMAIL PROTECTED] >Subject: Re: [vox-tech] vfat and permissions - anyone seen this before? >Date: Mon, 11 Mar 2002 18:24:34 -0800 >Reply-To: [EMAIL PROTECTED] > >-----BEGIN PGP SIGNED MESSAGE----- >Hash: SHA1 > >Vfat has some permission flags, hidden, system, archive, and read only. > >Perhaps you had one of these set? > >Windows usualy uses hidden and system to keep people from finding the sys= >tem=20 >files to mess with them (windows won't let you see them unless you tell i= >t to=20 >byy ajusting some settings.) > I thought of that but discounted it because I was always able to drag files into those directories under Windows.
However, when I got your answer, I did a little bit of experimentation using my roommate's computer, and a FAT formatted floppy disk. I touched two files and created two folders on that floppy and proceeded to make one of each read-only (using chmod -x): drwxr-xr-x 2 bloom bloom 512 Mar 11 19:16 dir1/ -rwxr-xr-x 1 bloom bloom 0 Mar 11 19:16 file1* -r-xr-xr-x 1 bloom bloom 0 Mar 11 19:16 filetobereadonly* dr-xr-xr-x 2 bloom bloom 512 Mar 11 19:16 readonlydir/ I took the disk to my roommate's XP computer, and put it in. I looked at the files and folders that were read-only there, and the list didn't agree (although there were clearly some read-only files and dirs and some read-write files and dirs). I found I was able to drag files into the read-only directories under windows, which may lend truth to the situation. I was about to ask if anybody knew of official documenation about this, but then I found the kernel code that seems to explain this: /* /usr/src/linux/include/linux/msdos_fs.h line 192 */ #define MSDOS_MKMODE(a,m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO)) (if the Read-Only attribute is set, permissions should be UMASK & 0555 otherwise they should be UMASK & 0777 ) In the reverse direction, #define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO) if the file is not writable by everyone (it it isn't ugo+w) then the read-only bit will be set. _______________________________________________ vox-tech mailing list [EMAIL PROTECTED] http://lists.lugod.org/mailman/listinfo/vox-tech
