Re: why does find_my_exec resolve symlinks?

Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
> Here is a scenario:
> ./configure --prefix=/usr/local/pgsql/9.4.1
> make
> make install
> ln -s 9.4.1 /usr/local/pgsql/9.4
> PATH=/usr/local/pgsql/9.4/bin:$PATH

> And then when 9.4.2 comes out, the symlink is updated.

> I think this sort of setup in variations is not uncommon.

If it were all that common, we'd have heard people complaining before.

> The reason for this behavior is

> commit 336969e490d71c316a42fabeccda87f798e562dd
> Author: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
> Date: Sat Nov 6 23:06:29 2004 +0000

> Add code to find_my_exec() to resolve a symbolic link down to the
> actual executable location. This allows people to continue to use
> setups where, eg, postmaster is symlinked from a convenient place.
> Per gripe from Josh Berkus.

> I don't quite understand what setup Josh was using there.

IIRC, the idea was that /usr/bin/postgres might be a symlink to
/usr/local/pgsql/9.4.1/bin/postgres. If we stop resolving symlinks,
that type of arrangement will break :-(. Given that it's been like
this for ten years without previous complaints, I'm disinclined to
mess with it ...

regards, tom lane