[PATCH] draft addition of github updater

[Ben Woodcroft]

Hi,

Importing from GitHub seems very non-trivial, but can we update? There's 
a number of issues with the attached patch but so far out of the 171 
github package in guix, it recognizes 101, and 17 are detected as out of 
date (see below).

I have two questions:

1. Some guess-work is required to get between the version as it is 
defined in guix, and that presented in the github json, where only the 
"tag_name" is available. Is it OK to be a little speculative in this 
conversion e.g. "v1.0" => "1.0"?

2. For mass-updates, it fails when it hits the abuse limit on github (60 
api requests per hour). This can be overcome by authenticating with an 
access token, but I don't think that token should go in the git 
repository. So I'm after some guidance on the best way of the user 
providing a token to the updater (or some other workaround).

Thanks,
ben

gnu/packages/xml.scm:378:13: pugixml would be upgraded from 1.6 to 1.7
gnu/packages/web.scm:685:6: sassc would be upgraded from 3.2.5 to 3.3.2
gnu/packages/video.scm:693:13: mpv would be upgraded from 0.11.0 to 0.13.0
gnu/packages/ocaml.scm:202:13: camlp4 would be upgraded from 4.02+6 to 
4.02.0+1
gnu/packages/ninja.scm:31:13: ninja would be upgraded from 1.5.3 to 1.6.0
gnu/packages/jrnl.scm:30:13: jrnl would be upgraded from 1.8.4 to 1.9.7
gnu/packages/gl.scm:453:13: libepoxy would be upgraded from 1.2 to 1.3.1
gnu/packages/game-development.scm:123:13: tiled would be upgraded from 
0.13.1 to 0.14.2
gnu/packages/fontutils.scm:285:13: libuninameslist would be upgraded 
from 0.4.20140731 to 0.5.20150701
gnu/packages/engineering.scm:58:13: librecad would be upgraded from 
2.0.6-rc to 2.0.8
gnu/packages/bioinformatics.scm:1530:13: htsjdk would be upgraded from 
1.129 to 1.140
gnu/packages/bioinformatics.scm:613:13: bowtie would be upgraded from 
2.2.4 to 2.2.6
gnu/packages/bioinformatics.scm:2925:13: vsearch would be upgraded from 
1.4.1 to 1.9.1
gnu/packages/bioinformatics.scm:1360:13: grit would be upgraded from 
2.0.2 to 2.0.5beta4
gnu/packages/bioinformatics.scm:758:13: clipper would be upgraded from 
0.3.0 to 1.0
gnu/packages/bioinformatics.scm:207:13: bedtools would be upgraded from 
2.24.0 to 2.25.0
gnu/packages/bioinformatics.scm:1610:13: idr would be upgraded from 
2.0.0 to 2.0.2

0001-import-Add-github-updater.patch
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