[Bug libc/578] New: zic fails when symlinks are used and directory is not empty

["asb at bu dot edu" <sourceware-bugzilla at sources dot redhat dot com>]

In timezone/zic.c, around line 630, if link() fails to create a hard link, a
symlink is created.  The target of the symlink is found by the following snippet:

   const char *s = tofile;
   register char * symlinkcontents = NULL;
   while ((s = strchr(s+1, '/')) != NULL)
       symlinkcontents = ecatalloc(symlinkcontents, ".\./");
   symlinkcontents = ecatalloc(symlinkcontents, fromname);

The last line should be:

   symlinkcontents = ecatalloc(symlinkcontents, fromfile);

-----------------------------

If the following conditions are met
 - directory is set to "/var/tmp/glibc-build-directory", and
 - symlinks are not possible
then dolink("America/Argentina/Cordoba","America/Cordoba") will produce a
symlink at /var/tmp/glibc-build-directory/America/Cordoba pointing to
..//var/tmp/glibc-build-directory/America/Argentina/Cordoba.

Clearly, the link is being created in the correct place, but the target should
be "../America/Argentina/Cordoba".

-----------------------------

This bug affects only users that can not create hard links.

-----------------------------

This bug produces the following build error durring make install on my system
(gentoo):

/var/tmp/portage/glibc-2.3.4.20040808-r1/work/build/timezone/zic: Can't link fro
m /var/tmp/portage/glibc-2.3.4.20040808-r1/image//usr/share/zoneinfo/America/Cor
doba to /var/tmp/portage/glibc-2.3.4.20040808-r1/image//usr/share/zoneinfo/Ameri
ca/Rosario: No such file or directory

because America/Cordoba exists, but is a dead link.

# file
/var/tmp/portage/glibc-2.3.4.20040808-r1/image//usr/share/zoneinfo/America/Cordoba

/var/tmp/portage/glibc-2.3.4.20040808-r1/image//usr/share/zoneinfo/America/Cordoba:
broken symbolic link to
`..//var/tmp/portage/glibc-2.3.4.20040808-r1/image//usr/share/zoneinfo/America/Argentina/Cordoba'

-- 
           Summary: zic fails when symlinks are used and directory is not
                    empty
           Product: glibc
           Version: 2.3.3
            Status: NEW
          Severity: minor
          Priority: P2
         Component: libc
        AssignedTo: gotom at debian dot or dot jp
        ReportedBy: asb at bu dot edu
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://sources.redhat.com/bugzilla/show_bug.cgi?id=578

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