USES=cargo vs. workspaces

[Jan Beich]

Jan Beich <jbeich at FreeBSD.org> writes:

> Some projects (e.g., Servo, Veloren) bundle several packages together.
> When dependencies also bundle packages it confuses "git" override.
> Any tips/workarounds that scale beyond 1 port?
>
> For example,
>
>   $ cat Makefile
>   PORTNAME=	veloren
>   DISTVERSIONSUFFIX=	v
>   DISTVERSION=	0.3.0
>   CATEGORIES=	games
>
>   USES=		cargo
>   USE_GITLAB=	yes
>   GL_COMMIT=	ef049607e008223d6f9d8a021dd00e1eeef44b5e
>
>   .sinclude "${.CURDIR}/Makefile.crates"
>   .include <bsd.port.mk>
>
>   $ make clean patch NO_CHECKSUM=
>   $ make cargo-crates >Makefile.crates
>   $ make makesum
>
>   $ make clean all
>   [...]
>   ===>  Configuring for veloren-0.3.0
>   error: failed to load source for a dependency on `conrod_core`
>
>   Caused by:
>     Unable to update WRKDIR/conrod-d603363488870eae9df91ba45ba795509c8a6ab4-d603363488870eae9df91ba45ba795509c8a6ab4
>
>   Caused by:
>     found a virtual manifest at `WRKDIR/conrod-d603363488870eae9df91ba45ba795509c8a6ab4-d603363488870eae9df91ba45ba795509c8a6ab4/Cargo.toml` instead of a package manifest
>   *** Error code 101
>
>   Stop.

Thanks to https://svnweb.freebsd.org/changeset/ports/517982
I've got past the error using the following

  CARGO_GIT_SUBDIR=	conrod_core:conrod_core:conrod_core \
  			conrod_core:conrod_winit:backends/conrod_winit

Veloren doesn't build yet due to dependency on a Nightly-only feature
but the progress is promising. I haven't tried Servo because it'd likely
require heavy patching and probably more hacks to work as a port.