Add a `passAlias` to `gopass` derivation, similarly to how there's `viAlias` parameter supported by vim/neovim derivations.
Apart from convenience this is also necessary for e.g. making `docker-credential-helpers` work without patching the latter - the package uses `pass` executable from `PATH` f78081d1f7/pass/pass_linux.go (L67). By setting `passAlias` to `true` (e.g. via overlays like so: 94971f34db/nixpkgs/overlays.nix (L315-L317)), secure Docker authentication via `gopass` "just works"™
gopass tries to write a version number to it's configuaration, even when
just generating the shell completion scripts. This fails, as
/homeless-shelter is read-only inside the sandbox.
As error messages are printed to stdout instead of stderr
(see https://github.com/gopasspw/gopass/issues/877), the error message
lands inside the completion script, thus breaking it.
Workaround that by setting GOPASS_CONFIG to `/dev/null`
This is another dependency needed when invoked with "gopass -c".
I opted for xclip instead of xsel, because xclip is tried first in
order.
Signed-off-by: aszlig <aszlig@nix.build>
Cc: @andir, @suvash, @mkaito
