Thursday, May 11, 2017

Build Git RPM on CentOS 7

I want to use core.hooksPath which supports since 2.9, but the default Git version of CentOS 7.3 is still 1.8.3:

$ yum list git

Available Packages

git.x86_64                        1.8.3.1-6.el7_2.1                         base
I have to compile from the source by myself. It is not hard to find bunch of blogs explain how to do it. For example, https://www.howtoforge.com/how-to-install-the-latest-git-version-on-centos. However, the method mentioned in those blogs is not what I want, a docker image based on centos:7 with the latest Git version. There are questions I don’t know the answers:
  • How can I clean up those required build tools like gcc? I don’t want a larger image size.
  • How can I install Git manuals? I could not remember all commands and parameters. It will be handy to reference by just typing git help xxx.
I believe the clean way is to build Git in RPM and install Git using RPM in my docker image. Sounds easy, but the first problem I had was where to get .spec to build RPM. The Git source code doesn’t have a RPM spec file. I finally found the spec from Redhat. But it is not easy like Gradle or Maven when you build from a RPM spec. You have to know the tools to pull the dependencies. Finally, my method is actually pretty simple after I figured it out all of steps because I made it in a dockerfile. Here are what I did:
  • I created a docker image git-rpm, which builds Git 2.12.2 in RPMs.
  • When running git-rpm in a container, a yum repository server starts.
  • When I build the docker image, I just simply put the local yum repository for Git, and call yum install -y git.
  • For centos:7, the default configuration turns off the manual installation tsflags=nodocs. I need to turn it on using yum --setopt tsflags='' -y install git.
If you want to get those RPMs from docker and put them to a yum repository, you can run docker cp

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