# Linux travis tries and fails to open Gtk display

**URL:** <https://discourse.julialang.org/t/linux-travis-tries-and-fails-to-open-gtk-display/3179>\
**Category:** General Usage\
**Tags:** testing, guis\
**Created:** [April 12, 2017, 12:30pm UTC](https://discourse.julialang.org/t/linux-travis-tries-and-fails-to-open-gtk-display/3179 "2017-04-12T12:30:24Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![yakir12](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/yakir12/32/297_2.png) [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Post date:** [April 12, 2017, 12:30pm UTC](https://discourse.julialang.org/t/linux-travis-tries-and-fails-to-open-gtk-display/3179/1 "2017-04-12T12:30:24Z")

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I’m writing [this package](https://github.com/yakir12/Associations.jl), and wanted to test it on Travis. It includes `Gtk.jl`.

While the `osx` build works fine, the `linux` one doesn’t:

```julia
INFO: Testing Associations

WARNING: Method definition depth_buffer(Gtk.GtkGLArea, Bool) in module Gtk at /home/travis/.julia/v0.5/Gtk/src/gl_area.jl:33 overwritten at /home/travis/.julia/v0.5/Gtk/src/gl_area.jl:35.

WARNING: Method definition stencil_buffer(Gtk.GtkGLArea) in module Gtk at /home/travis/.julia/v0.5/Gtk/src/gl_area.jl:37 overwritten at /home/travis/.julia/v0.5/Gtk/src/gl_area.jl:39.

ERROR: LoadError: InitError: Cannot open display: 

 in Gtk.GLib.GError(::Gtk.##229#230) at /home/travis/.julia/v0.5/Gtk/src/GLib/gerror.jl:17

 in __init__ () at /home/travis/.julia/v0.5/Gtk/src/events.jl:10

 in _include_from_serialized(::String) at ./loading.jl:150

 in _require_from_serialized(::Int64, ::Symbol, ::String, ::Bool) at ./loading.jl:187

 in require(::Symbol) at ./loading.jl:394

 in include_from_node1(::String) at ./loading.jl:488

 in macro expansion; at ./none:2 [inlined]

 in anonymous at ./<missing>:?

 in eval(::Module, ::Any) at ./boot.jl:234

 in process_options(::Base.JLOptions) at ./client.jl:242

 in _start() at ./client.jl:321

during initialization of module Gtk

while loading /home/travis/.julia/v0.5/Associations/src/Associations.jl, in expression starting on line 4

ERROR: LoadError: Failed to precompile Associations to /home/travis/.julia/lib/v0.5/Associations.ji.

 in compilecache(::String) at ./loading.jl:593

 in require(::Symbol) at ./loading.jl:422

 in include_from_node1(::String) at ./loading.jl:488

 in process_options(::Base.JLOptions) at ./client.jl:265

 in _start() at ./client.jl:321

while loading /home/travis/.julia/v0.5/Associations/test/runtests.jl, in expression starting on line 1

============================[ERROR: Associations]=============================

```

While my package does involve some GUI, none of my testing does (I only test non-GUI parts of the code). Any ideas?

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<div class="post-metadata">

**Author:** ![jameson](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jameson/32/23_2.png) [@jameson](https://discourse.julialang.org/u/jameson)\
**Post date:** [April 12, 2017, 12:53pm UTC](https://discourse.julialang.org/t/linux-travis-tries-and-fails-to-open-gtk-display/3179/2 "2017-04-12T12:53:32Z")

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Use `xvfb-run`, such as demonstrated at [https://github.com/JuliaGraphics/Gtk.jl/blob/c39f3b608e8c035b25a05ddaa4427010cf180c17/.travis.yml#L19](https://github.com/JuliaGraphics/Gtk.jl/blob/c39f3b608e8c035b25a05ddaa4427010cf180c17/.travis.yml#L19)

Could you also make a PR to the Gtk README? “How to have working CI” is probably a very useful topic for many.

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**Author:** ![yakir12](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/yakir12/32/297_2.png) [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Post date:** [April 12, 2017, 2:56pm UTC](https://discourse.julialang.org/t/linux-travis-tries-and-fails-to-open-gtk-display/3179/3 "2017-04-12T14:56:32Z")

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I’d love to, but this didn’t fix the issue 😕

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<div class="post-metadata">

**Author:** ![jameson](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jameson/32/23_2.png) [@jameson](https://discourse.julialang.org/u/jameson)\
**Post date:** [April 12, 2017, 3:23pm UTC](https://discourse.julialang.org/t/linux-travis-tries-and-fails-to-open-gtk-display/3179/4 "2017-04-12T15:23:54Z")

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Looking at [https://github.com/yakir12/Associations.jl/commit/df4a6ced37b76b3810f89bb23e33f590fc0bb392](https://github.com/yakir12/Associations.jl/commit/df4a6ced37b76b3810f89bb23e33f590fc0bb392), you also need to initialize ([https://github.com/JuliaGraphics/Gtk.jl/blob/c39f3b608e8c035b25a05ddaa4427010cf180c17/.travis.yml#L14-L16](https://github.com/JuliaGraphics/Gtk.jl/blob/c39f3b608e8c035b25a05ddaa4427010cf180c17/.travis.yml#L14-L16)) and use ([https://github.com/JuliaGraphics/Gtk.jl/blob/c39f3b608e8c035b25a05ddaa4427010cf180c17/.travis.yml#L20](https://github.com/JuliaGraphics/Gtk.jl/blob/c39f3b608e8c035b25a05ddaa4427010cf180c17/.travis.yml#L20)) the variable.

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<div class="post-metadata">

**Author:** ![yakir12](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/yakir12/32/297_2.png) [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Post date:** [April 12, 2017, 3:49pm UTC](https://discourse.julialang.org/t/linux-travis-tries-and-fails-to-open-gtk-display/3179/5 "2017-04-12T15:49:53Z")

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Woohoo! It worked! Thanks! I’ll PR the docs once Gtk.jl merges my last documents PR.

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<div class="post-metadata">

**Author:** ![tknopp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tknopp/32/3569_2.png) [@tknopp](https://discourse.julialang.org/u/tknopp)\
**Post date:** [April 12, 2017, 3:59pm UTC](https://discourse.julialang.org/t/linux-travis-tries-and-fails-to-open-gtk-display/3179/6 "2017-04-12T15:59:49Z")

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This would indeed be good to have in the documentation. But please in the new documentation system 🙂

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<div class="post-metadata">

**Author:** ![yakir12](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/yakir12/32/297_2.png) [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Post date:** [April 12, 2017, 4:06pm UTC](https://discourse.julialang.org/t/linux-travis-tries-and-fails-to-open-gtk-display/3179/7 "2017-04-12T16:06:43Z")

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my last change was in the new docs system, right?