conf-qt: don't run a script that calls 'sudo add-apt-repository'

[yallop]

The source linux depext script for conf-qt is Ubuntu-specific:

sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu trusty universe"
sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu trusty main"

and has surprising and enduring effects on other systems (e.g. Debian). Removing this will probably make the CI fail, but is better for users.

/cc @Kakadu

[Kakadu]

@yallop
If Ubuntu version on CI server is rather new (12.04 didn't have right packages in 2013) we can remove the script at all.

[yallop]

Yes, Travis is running Trusty nowadays, so the packages that were once missing may be directly installable now.

[Kakadu]

It could even pass CI after your change ....

[Kakadu]

It seems that qt5-qmake package is needed....

[Kakadu]

From logs I can see that we don't have Qt5 installed on the GNU/Linux that uses apk package manager.

There are also some issues with QOCamlBrowser but I will deal with them in #9924

[yallop]

From logs I can see that we don't have Qt5 installed on the GNU/Linux that uses apk package manager.

Yes; neither alpine nor Centos have Qt5 available, as far I can see.

[Kakadu]

Well, there is something https://pkgs.alpinelinux.org/package/edge/community/x86/qt5-qtbase

But for me it will be easier to disable CIing of Qt related packages on these distro's (my heart belongs to .debs)

[Kakadu]

Well, qmake for qt5 is not found because it has different name in Alpine. https://pkgs.alpinelinux.org/contents?branch=edge&name=qt5-qtbase-dev&arch=ppc64le&repo=community

I will try to get something useful from the Alpine Linux IRC.....

[Kakadu]

@yallop It seems that on alpine we need to adjust PATH to successfully use Qt5 on alpine, like set PATH= /usr/lib/qt5/bin/:$PATH. There is a small issue: I don't know how to make this command runnable only on alpine and manual entry doesn't help so much http://opam.ocaml.org/doc/Manual.html#Filters

Of course, we can run this path adjustment for every platform and hope that it will work OK.... What do you think?

[yallop]

@Kakadu: I think something like this might work:

build: [
    ["sh" "-exc" "PATH=/usr/lib/qt5/bin:$PATH echo \"Your Qt version is `qmake -query QT_VERSION`\"" ] 
       {os = "alpine"}
   …

[dbuenzli]

{os = "alpine"}

I think os is the result of uname -s so I don't think that this will work.

[yallop]

I expect you're right, @dbuenzli, but in that case we have a few errors elsewhere in the repository, e.g. in sodium (cc @dsheets).

[Kakadu]

it seems that @dbuenzli is right

[Kakadu]

@avsm Our minds have been diverged. Can you help us to constraint some opam commands to the linux version? The "os" variable corresponds to the output of uname command but we need output of lsb_release -i.

[avsm]

I'm afraid it's hard to fix this without opam changes -- see ocaml/opam#2919 for the issue tracking the opam2 improvements in this regard.