ImageMagick installation in Docker Alpine
So I have this Dockerfile that attempts to install ImageMagick the following way:
FROM ruby:2.4-alpine
...
RUN apk --update add imagemagick
...The point is that the container doesn't recognizes the file utility (for content-type detection).
Local environment (Mac OSX, installed imagemagick with brew):
> file --version
file-5.25
magic file from /usr/share/file/magic
> convert --version
Version: ImageMagick 6.9.9-5 Q16 x86_64 2017-08-03
Copyright: © 1999-2017 ImageMagick Studio LLC
License:
Features: Cipher DPC Modules
Delegates (built-in): bzlib freetype jng jpeg ltdl lzma png tiff xml zlibDocker Alpine container (accessed to the shell using docker exec -it CONTAINER_ID):
> file --version
sh: file: not found
> convert --version
Version: ImageMagick 6.9.5-9 Q16 x86_64 2016-10-21
Copyright: Copyright (C) 1999-2016 ImageMagick Studio LLC
License:
Features: Cipher Modules
Delegates (built-in): fontconfig freetype gslib jng jpeg lcms ltdl png ps tiff webp zlibAlso tried installing imagemagick-dev by itself, and both of them combined without any luck (shouldn't make a difference since the first one is a dependency of the latter, I guess).
The question is, how can I install this in the Alpine container? I think I'm missing something but can't figure it out.
By the way, I can't rely on another function other than file for content-type detection since I'm using a framework that explicitly uses this.
1 Answer
Here's a similar Q/A that helped me on stackoverflow:
imagemagick installation in docker alpine
The file utility is not part of ImageMagick, it is a standard utility. You can read more about it on wikipedia:
File (command).
On Alpine Linux, you can install it with apk add --no-cache file. As shown in the following terminal session:
/ # file /etc/group
/bin/sh: file: not found
/ # apk add --no-cache file
fetch
fetch
/APKINDEX.tar.gz
(1/2) Installing libmagic (5.32-r0)
(2/2) Installing file (5.32-r0)
Executing busybox-1.26.2-r5.trigger
OK: 9 MiB in 13 packages
/ # file /etc/group
/etc/group: ASCII text
/ #
