Question

我有一个使用ruby-filemagic的rails 4应用，因此需要在系统上安装filemagic。

我尝试通过模仿this question的解决方案在Heroku上安装它，但它无法正常工作。我尝试了很多东西，但我认为最有希望的是通过apt-get安装，这要归功于（修改过的）apt-get，config和ruby的组合buildpacks。在配置中，我使用BUNDLE_BUILD__RUBY-FILEMAGIC: --with-magic-dir=/app/.apt/usr/ --with-magic-include=/app/.apt/usr/include --with-magic-lib=/app/.apt/usr/lib

最终，我仍然得到了这个：

  /tmp/build_29e629f8a00379850ab44096c10f1afc/vendor/ruby-2.0.0/bin/ruby extconf.rb --with-magic-dir=/tmp/build_29e629f8a00379850ab44096c10f1afc/.apt/usr/ --with-magic-include=/tmp/build_29e629f8a00379850ab44096c10f1afc/.apt/usr/include --with-magic-lib=/tmp/build_29e629f8a`00379850ab44096c10f1afc/.apt/usr/lib
   checking for main() in -lgnurx... no
   checking for magic_open() in -lmagic... no
   *** ERROR: missing required library to compile this module
   *** extconf.rb failed ***
   Could not create Makefile due to some reason, probably lack of necessary
   libraries and/or headers.  Check the mkmf.log file for more details.  You may
   need configuration options.

libmagic已安装到此目录中。它的内容相当于deb包的内容，虽然看起来很轻。

Answer 1

我能够做到这一点：

.buildpacks：

https://github.com/ddollar/heroku-buildpack-apt#master
https://github.com/heroku/heroku-buildpack-ruby.git#master

Aptfile：

libmagic-dev

没有必要使用heroku-bundle-config。

Answer 2

您需要在主buildpack

之前添加heroku buildpacks:add --index 1 https://github.com/NetsoftHoldings/heroku-buildpack-magic.git buildpack

def find_stddevs(img): k = np.asmatrix([[-1.0/9, -1.0/9 ,-1.0/9], [-1.0/9, 8.0/9 , -1.0/9], [-1.0/9, -1.0/9 ,-1.0/9]]) filtered = convolve(img,k,mode='reflect') median_a = np.median(filtered) stddev = np.median(np.absolute(filtered - median_a))/0.67449 #Gaussian noise assumption return stddev

如何在Heroku上安装libmagic？

2 个答案: