Public bug reported:

[Impact]
We want to backport docker and related packages to Trusty. The dh-golang in 
trusty is too old and lacks features used by the packages we want to backport 
(particularly the support for the  DH_GOLANG_BUILDPKG and DH_GOLANG_EXCLUDES 
variables to control which packages are built, but also the support for reading 
the Go import path from the control file).

dh-golang is up to version 1.18 in sid/yakkety now but that causes 1
package (ngrok) in trusty to ftbfs. 1.13 seems to be a sweet spot in
terms of having features and fixes we need but not breaking any packages
in trusty.

[Test case]
In fact, there is already a package in trusty that uses tries to use the newer 
features and has a bug as a result: golang-logrus builds an _all 
golang-logrus-dev package that contains a i386 binary:

mwhudson@aeglos:~/tmp$ lintian 
golang-logrus-dev_0.7.3-1~ubuntu0.14.04.1_all.deb 
E: golang-logrus-dev: arch-independent-package-contains-binary-or-object 
usr/bin/basic

So a test case would be to rebuild this package and see if this lintian
error goes away.

[Regression potential]
There is obviously some potential for regressions here, but I've rebuilt all 
reverse dependencies of dh-golang in trusty twice, once with the version of 
dh-golang in trusty:

    https://launchpad.net/~mwhudson/+archive/ubuntu/trusty-go-rebuilds

and once with a backport of dh-golang 1.13:

    https://launchpad.net/~mwhudson/+archive/ubuntu/trusty-go-rebuilds-
dh-golang-2

I debmirror-ed both PPAs and compared the results (with find and
debdiff). Apart from fixing the above bug in golang-logrus, the only
differences are in golang-doozer, golang-openldap, and golang-
goprotobuf-dev and are down to the fact that dh-golang now by default
includes .proto, .c and .s files in -dev packages. This is at worst
harmless and quite possibly would make the packages more useful.

** Affects: dh-golang (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: dh-golang (Ubuntu Trusty)
     Importance: Undecided
     Assignee: Michael Hudson-Doyle (mwhudson)
         Status: In Progress

** Also affects: dh-golang (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: dh-golang (Ubuntu)
       Status: New => Invalid

** Changed in: dh-golang (Ubuntu Trusty)
       Status: New => In Progress

** Changed in: dh-golang (Ubuntu Trusty)
     Assignee: (unassigned) => Michael Hudson-Doyle (mwhudson)

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https://bugs.launchpad.net/bugs/1595021

Title:
  Backport dh-golang 1.13 to trusty

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