Messages in this thread | | | From | junkio@cox ... | Subject | Re: Symlink indirection | Date | 14 Dec 2002 23:24:15 -0800 |
| |
"AW" == Andrew Walrond <andrew@walrond.org> gives an example of a/{x,y,z}, b/{y,z}, c/z mounted on d/. in that order, later mounts covering the earlier ones.
AW> echo "d/w" > d/w would create a new file in directory a.
Personally I'd rather expect this to happen in c/. Imagine a/ being on read-only medium like CD-ROM containing bunch of source files, b/ to hold patched source, and c/ to hold binaries resulting from compilation. That is,
rm -fr a b c d mkdir a b c d mount /cdrom a mount --bind a d mount --bind --overlay b d (cd b && bzip2 -d <../patch-2.9.91.bz2 | patch -p1) mount --bind --overlay c d (cd c && make mrproper && cat ../.config >.config && make oldconfig && make dep && make bzImage)
Back to your example; what do you wish to happen when we do this?
$ mv d/z d/zz && test -f d/z && cat d/z
Here we rename d/z (which is really c/z) to zz. Does this reveal z that used to be hidden by that, namely b/z, and "cat d/z" now shows "b/z"?
Or just like the case of creating a new file, does the union "remember" the fact that the directory "d" should not contain "z" anymore, and "test -f d/z" fails?
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |