pkgs/profpatsch/nman: don't realise all build outputs for `out`

nix-instantiate unfortunately prints the plain .drv path for <attr>.out
wheras it prints <name>.drv!<output> for all non-default outputs. If we
realise the plain .drv path, _all_ outputs are realised which is not
desireable since we may not need extra store path being created by this,
e. g. for a derivation with outputs = [ "out" "lib" "dev" ] we only need
to realise "out" if the man pages are located in there, saving a bit of
time and disk space.

We implement this better behavior by adding the render function to
DrvWithOutput which converts a DrvWithOutput (at the cost of copying) to
an OsString. If the output is out, "!out" is appended to the path
meaning nix-store will only realise the default output.

0 files changed, 0 insertions, 0 deletions