Caching apt-get install results

Build Environment
1

I need to use gcc-5 and g+±5 so I have the following circle.yml file which installs them and uses update-alternatives to make them the default version:

dependencies:
pre:
- sudo apt-get update; sudo apt-get install gcc-5; sudo apt-get install g+±5
- sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 100
- sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g+±5 100

test:
pre:
- gcc --version
- g++ --version
- make

post:
- ./helloworld

This works well, but it takes about 50 seconds to install gcc-5 and g++5.

Is there a way to cache them so they don’t have to be manually installed each build?

2

Hello!

Unfortunately there is no good way to currently cache anything installed with apt. If you would like to see this as a feature I would encourage you to make this a feature request.

3

I use “simple way” to achieve this.

Just find correspondent .deb packages, download, cache, and install them in post dependencies task with dpkg.

Below is simple circle.yml to demostrate

dependencies:
  override:
    - /bin/true
  cache_directories:
    - "~/.local"
  pre:
    - >-
      if [[ ! -d "$HOME/.local/debs" ]]; then \
        mkdir -p "$HOME/.local/debs"; cd "$HOME/.local/debs" \
        && curl -LOs http://launchpadlibrarian.net/198723929/libc6-dbg_2.19-0ubuntu6.6_amd64.deb \
      ; fi
  post:
    - sudo dpkg -i $HOME/.local/debs/libc6-dbg_2.19-0ubuntu6.6_amd64.deb
4

For anyone who’s doing this, you can use apt-get download <library> instead of hunting around for the urls.

5

Hello!

I’ve just published a guide which helps improve apt-get installs on CCI, please try it out and let me know how we can improve it!