Make top level /var/lib/postfix as root:root 0755
After generating custom configs in /var/lib/postfix/conf,
`postfix set-permissions` called, to perform all required tricks
related to queue handling (postfix use file mode bits to keep
some internal statuses, so `chmod -R` not recommended by authors,
see comments in $out/libexec/postfix/post-install for details)
Also post-install script was patched, to skip permission check/update
for files inside $out, as well as symlinks following to $NIX_STORE.
Config file `main.cf` extended with all default directory locations,
to prevent post-install script from guessing and overwrite them.
And finally all actions in activation script snippets performed
by postmap/postalias/postfix tools from current build, not random one
from paths.
Passing install_root=$out isn't a good idea because the install script is going
to pre-pend that prefix to all other paths even though these have the $out
prefix already. The resulting installation is a mess. Instead, we use the
"fake" install prefix "out" and then move all files and directories into the
right place afterward.
Instead, use the generic package override mechanism to use packages
from earlier bootstrap phases.
* Don't rely on the existence of attributes such as
`stdenv.coreutils'.
svn path=/nixpkgs/trunk/; revision=22991
probably be a bit tricky, due to sendmail "compatibility" (postfix makes
a symlink to "sendmail", so programs will keep on working).
svn path=/nixpkgs/trunk/; revision=5030
