LoadError: Could not open library 'glib-2.0'

[mbajur]

Hello, this is continuation of an issue i opened on image_processing gem issue tracker (link to original issue). Long story short: i am not able to use ruby-vips on alpine in any possible way. I've tried to set it up using this and this Dockerfiles and also i tried to use apk packages and still no luck. It always ends up in:

Traceback (most recent call last):
	8: from app.rb:11:in `<main>'
	7: from app.rb:11:in `require'
	6: from /usr/local/bundle/gems/image_processing-1.7.1/lib/image_processing/vips.rb:1:in `<top (required)>'
	5: from /usr/local/bundle/gems/image_processing-1.7.1/lib/image_processing/vips.rb:1:in `require'
	4: from /usr/local/bundle/gems/ruby-vips-2.0.13/lib/vips.rb:13:in `<top (required)>'
	3: from /usr/local/bundle/gems/ruby-vips-2.0.13/lib/vips.rb:28:in `<module:GLib>'
	2: from /usr/local/bundle/gems/ffi-1.9.25/lib/ffi/library.rb:99:in `ffi_lib'
	1: from /usr/local/bundle/gems/ffi-1.9.25/lib/ffi/library.rb:99:in `map'
/usr/local/bundle/gems/ffi-1.9.25/lib/ffi/library.rb:145:in `block in ffi_lib': Could not open library 'glib-2.0': Error loading shared library glib-2.0: No such file or directory. (LoadError)
Could not open library 'libglib-2.0.so': Error loading shared library libglib-2.0.so: No such file or directory

I've also prepared a simple docker-based repo to make it able to reproduce it easily. To do so, you can clone it: https://github.com/mbajur/ruby-vips-example

and run:

docker build -t ruby-vips-example .
docker run --rm -ti ruby-vips-example bundle exec ruby app.rb

Please take note i can't be considered as an super experienced unix power-user. I know some stuff but that's probably not enough and it's highly possible i've did some really silly mistake in here - and i'm really sorry if so.

Thanks in advance!

[jcupitt]

Hi, I made you a demo dockerfile for ruby-vips on alpine:

https://github.com/jcupitt/docker-builds/blob/master/ruby-vips-alpine/Dockerfile

I see:

john@kiwi:~/GIT/docker-builds/ruby-vips-alpine (master)$ docker run -it --rm ruby-vips-alpine:latest irb
irb(main):001:0> require 'vips'
=> true
irb(main):002:0> x = Vips::Image.black 100, 100
=> #<Image 100x100 uchar, 1 bands, multiband>
irb(main):003:0> 

[jcupitt]

Your dockerfile is using a testing (I think) alpine, not alpine latest. libvips is still not available via apk on alpine (I think), so I built from source.

[jcupitt]

Yes, I think you are mixing up alpine packages from edge and testing with regular alpine. Until vips (finally!) lands in alpine:latest, it's safest to build your own libvips (I think).

[mbajur]

Thank you! Following your example did the trick :)