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Full Discussion: Creating conditional symlink
Operating Systems Linux Ubuntu Creating conditional symlink Post 302806771 by skiwi on Monday 13th of May 2013 03:58:27 PM
Old 05-13-2013
Reference conditional symlinks

Hi, I am wondering if there is a way to create 'conditional symlinks' on a GNU/linux or unix system. I know this has been brought up already several times.. (I wanted to put some links but I dont have 5 posts yet..)

From wikipedia
Quote:
Pyramid Technology's OSx implemented conditional symbolic links which pointed to different locations depending on which universe a program was running in.
However I haven't seen any solutions.

I have the "feeling" that it could perhaps be done by creating a special device (like in /dev). However I have no experience creating such devices. For example a small C-program could act as wrapper processing the conditionals, working as pipe stream. For example based on the hostname the stream would point to either file1 or file2, of course more complicated operations are easily possible if this basic example works.

Could someone comment if my hunch makes any sense?

Thanks.
 

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SYMLINKS(8)						      System Manager's Manual						       SYMLINKS(8)

NAME
symlinks - symbolic link maintenance utility SYNOPSIS
symlinks [ -cdrstv ] dirlist DESCRIPTION
symlinks is a useful utility for maintainers of FTP sites, CDROMs, and Linux software distributions. It scans directories for symbolic links and lists them on stdout, often revealing flaws in the filesystem tree. Each link is output with a classification of relative, absolute, dangling, messy, lengthy, or other_fs. relative links are those expressed as paths relative to the directory in which the links reside, usually independent of the mount point of the filesystem. absolute links are those given as an absolute path from the root directory as indicated by a leading slash (/). dangling links are those for which the target of the link does not currently exist. This commonly occurs for absolute links when a filesystem is mounted at other than its customary mount point (such as when the normal root filesystem is mounted at /mnt after booting from alternative media). messy links are links which contain unnecessary slashes or dots in the path. These are cleaned up as well when -c is specified. lengthy links are links which use "../" more than necessary in the path (eg. /bin/vi -> ../bin/vim) These are only detected when -s is specified, and are only cleaned up when -c is also specified. other_fs are those links whose target currently resides on a different filesystem from where symlinks was run (most useful with -r ). OPTIONS
-c convert absolute links (within the same filesystem) to relative links. This permits links to maintain their validity regardless of the mount point used for the filesystem -- a desirable setup in most cases. This option also causes any messy links to be cleaned up, and, if -s was also specified, then lengthy links are also shortened. Links affected by -c are prefixed with changed in the output. -d causes dangling links to be removed. -r recursively operate on subdirectories within the same filesystem. -s causes lengthy links to be detected. -t is used to test for what symlinks would do if -c were specified, but without really changing anything. -v show all symbolic links. By default, relative links are not shown unless -v is specified. BUGS
symlinks does not recurse or change links across filesystems. AUTHOR
symlinks has been written by Mark Lord <mlord@bnr.ca>, the developer and maintainer of the IDE Performance Package for linux. SEE ALSO
symlink(2) Version 1.2 November 1994 SYMLINKS(8)
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