[pkg-golang-devel] Bug#832160: golang-defaults: Upgrading golang-go did not change /usr/lib/go dir to symlink (hence godoc fails)

[Anthony Fok]

Source: golang-defaults
Version: 2:1.6.1+1
Severity: normal
Tags: patch

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I was on my way out and wanted to access Go documentation off-line,
so I tried running godoc, and got the following error messages:

    $ godoc -http=:6060
    2016/07/22 14:36:32 updateMetadata:
        open /usr/lib/go/doc: no such file or directory
    2016/07/22 14:36:32 updateMetadata:
        open /usr/lib/go/doc: no such file or directory

I initially suspects a bug with the golang-golang-x-tools package
to which /usr/bin/godoc belongs, but it turns out that /usr/lib/go
on my computer is an empty directory, whereas golang-go (from the new
golang-defaults source package) contains /usr/lib/go as a symlink to
/usr/lib/go-1.6.  This affects users like me who upgrade from
pre-"golang-defaults" golang-go to the current golang-go.

With the help of dpkg-maintscript-helper(1), this transition can be
handled quite nicely.  The attached patch adds
debian/golang-go.maintscript and modifies debian/rules to do so,
and has been tested to work locally.

Note: debian/golang-go.maintscript runs "#!/usr/bin/dh-exec" and thus
      needs to have "chmod +x" set.

Cheers,

Anthony

- -- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.6.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

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