On Monday, September 9, 2019 2:46:16 PM PDT William Hubbs wrote:
> On Tue, Sep 10, 2019 at 08:35:17AM +1200, Kent Fredric wrote:
> > On Mon, 9 Sep 2019 12:34:18 -0500
> > 
> > William Hubbs <williamh@gentoo.org> wrote:
> > > There is another option I want to try which is adding "go mod vendor" to
> > > src_unpack for go packages.
> > 
> > Is it infeasible to write a tool that you execute as a maintainer, that
> > simulates what "go mod vendor" would do, but instead emits a list of
> > entries for SRC_URI, and then have an eclass or something construct the
> > vendor dir from those?
> > 
> > That's what is available for rust stuff.
> 
> I'm not sure how feasible something like that is.
> 
> $ go list -m all
> 
> will list the dependencies of a module, but that doesn't look like it
> can be translated into src_uri format.
> 
> You would basically have to parse go.mod exactly the way upstream does
> it and come up with a way to download the correct versions of the
> source.
> 
> William

check mail-client/aerc ebuild.
I use "go list -m all" and manually format EGO_VENDOR string which will be 
translated into SRC_URI by eclass.
tool is certainly possible and should be quite easy to implement.
some manual editing will still be needed if dealing with forked packages/
repos, but looks pretty straightforward.
This is very similar approach to cargo ebuilds and it supports offline 
installs, PM checksumming and does not require packaging every single go 
dependency as a package.