gdk-pixdump possibly not installed correctly

[bjarthur]

when testing Gtk.jl, i get the following error:

(<unknown>:92780): GdkPixbuf-WARNING **: Cannot open pixbuf loader module file '/Users/arthurb/.julia-test/v0.4/Homebrew/deps/usr/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache': No such file or directory

This likely means that your installation is broken.
Try running the command
  gdk-pixbuf-query-loaders > /Users/arthurb/.julia-test/v0.4/Homebrew/deps/usr/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache
to make things work again for the time being.

there are two problems here i believe. first is that nominally gdk-pixbuf 2.34.0 is installed, yet the loader files are stored in a directory named 2.10.0. second is that loaders.cache does not exist.

the relevant issue over at Gtk.jl is JuliaGraphics/Gtk.jl#242. what should i set these variables too?

ENV["GDK_PIXBUF_MODULEDIR"] = joinpath("$(Homebrew.brew_prefix)", "lib/gdk-pixbuf-2.0/2.10.0/loaders")
ENV["GDK_PIXBUF_MODULE_FILE"] = joinpath("$(Homebrew.brew_prefix)", "lib/gdk-pixbuf-2.0/2.10.0/loaders.cache")

[staticfloat]

@bjarthur I apologize for the late response, feel free to ping me via @staticfloat if an issue goes this long without me answering it; it's probably because I just haven't been on github recently, so please do get my attention, as I (annoyingly) don't get emails when new issues are opened.

If you run the following, do things work as expected?

using Homebrew
Homebrew.postinstall("gdk-pixbuf")
Pkg.test("Gtk")

[bjarthur]

Homebrew.postinstall("gdk-pixbuf") says it runs

/Users/arthurb/.julia/v0.4/Homebrew/deps/usr/Cellar/gdk-pixbuf/2.34.0/bin/gdk-pixbuf-query-loaders --update-cache

but it appears to do nothing, so i run this same command on the unix command line and get Failed to create file '/usr/local/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache.514HLY': No such file or directory.

so i manually redirect to where i think it should be:

/Users/arthurb/.julia/v0.4/Homebrew/deps/usr/Cellar/gdk-pixbuf/2.34.0/bin/gdk-pixbuf-query-loaders > /Users/arthurb/.julia/v0.4/Homebrew/deps/usr/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache

now Pkg.test("Gtk") results in a new error:

Gtk-WARNING **: Could not load a pixbuf from /org/gtk/libgtk/theme/Adwaita/assets/check-symbolic.svg. This may indicate that pixbuf loaders or the mime database could not be found.

[staticfloat]

When you say "it appears to do nothing" what do you mean? It should be creating that loaders.cache file when you run postinstall. Is it not?

[bjarthur]

correct. i do not see a loaders.cache file anywhere. but perhaps i'm not looking in the right place?

[staticfloat]

@bjarthur Ah, you're probably looking in the wrong place. You should be looking in this directory:

$ ls -la ~/.julia/v0.4/Homebrew/deps/usr/lib/gdk-pixbuf-2.0/2.10.0
total 8
drwxr-xr-x   4 sabae  staff   136 Jul 20 22:55 .
drwxr-xr-x   3 sabae  staff   102 Jul 20 22:52 ..
drwxr-xr-x  41 sabae  staff  1394 Jul 20 22:52 loaders
-rw-r--r--   1 sabae  staff  3288 Jul 20 22:55 loaders.cache

That should be generated by the postinstall step we manually ran. If that's not being generated, then we have bigger problems. What the postinstall step does is run this ruby code, which should be equivalent to the following:

export GDK_PIXBUF_MODULE_FILE="$(echo ~)/.julia/v0.4/Homebrew/deps/usr/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache"
export GDK_PIXBUF_MODULEDIR="$(echo ~)/.julia/v0.4/Homebrew/deps/usr/lib/gdk-pixbuf-2.0/2.10.0/loaders"
~/.julia/v0.4/Homebrew/deps/usr/bin/gdk-pixbuf-query-loaders --update-cache

Let's try deleting the loaders.cache file that you have right now, and seeing how we can generate it. The .svg file that's missing I think can be ignored for now.

[bjarthur]

bigger problems i think. with a fresh install of Homebrew, i build Gtk and there is no loaders.cache in that directory. there is the loaders subdirectory though. nothing changes with the manual postinstall. this is with the master branch of Homebrew and Gtk on julia 0.4. has something changed recently, because i do remember seeing that file awhile back. also, shouldn't it be in a directory called 2.34.0 to match the installed version of gdk-pixbuf?

[staticfloat]

Nope, unfortunately, the 2.10.0 is a different version number than the actual version of gdk-pixbuf. Stupid, I know.

What happens if you run it manually, e.g. with the three bash lines at the end of my last message?

[bjarthur]

w00t! the path is wrong. it should be Homebrew/deps/usr/bin/gdk-pixbuf-query-loaders --update-cache. everything works when i do that manually. EDIT: and preceed it by the two exports ofc.

[staticfloat]

Ah, shoot, you're right, I mistyped that. I've edited my code snippet above so that there's no confusion in the future. I believe I have found a bug in the gdk-pixbuf formula that is causing this file to not be generated, I've opened a PR to the mainline Homebrew guys here, hopefully we'll have this worked out so we don't have to manually run the postinstall step soon!

[bjarthur]

the homebrew guys have merged, and checking out the latest Homebrew.jl fixes this issue, so i'll close it. but one question: Gtk travis tests are still failing because of this issue. will they work again once you've tagged another version of Homebrew.jl? thanks.

[staticfloat]

Yes, but a good way to test that is to make a branch of Gtk.jl, and add a Pkg.checkout("Homebrew") before you run your tests.

[bjarthur]

i take it back. the loaders.cache file is still not generated after the following sequence:

;rm -rf Homebrew
Pkg.add("Homebrew")
Pkg.checkout("Homebrew")
Pkg.build("Homebrew")
using Homebrew
Homebrew.update()
Homebrew.add("gdk-pixmap")
Homebrew.postinstall("gdk-pixbuf")

only when i do the following is it there:

export GDK_PIXBUF_MODULE_FILE="$(echo ~)/.julia/v0.4/Homebrew/deps/usr/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache"
export GDK_PIXBUF_MODULEDIR="$(echo ~)/.julia/v0.4/Homebrew/deps/usr/lib/gdk-pixbuf-2.0/2.10.0/loaders"
Homebrew/deps/usr/bin/gdk-pixbuf-query-loaders --update-cache

[staticfloat]

Thanks for the follow-through @bjarthur, can you check to see if it is placed in $(echo ~)/.julia/v0.4/Homebrew/deps/usr/Cellar/gdk-pixbuf/2.34.0/lib/gdk-pixbuf-2.0/2.10.0? (Note, I may have mistyped that a bit, but the general idea is that it may be getting placed within the <brew prefix>/Cellar/gdk-pixbuf/ location instead of the global <brew prefix>/lib location)

[bjarthur]

bingo. that's precisely where it is, in deps/usr/Cellar. in fact, if i change the GTK exports to look there, everything works. is that what i should do? or should Homebrew be changed to put loaders.cache in deps/usr/lib ?