Yum的变量学习笔记

http://mirrors.aliyun.com/centos/%24releasever/addons/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: addons. Please verify its path and try again

$releasever This will be replaced with the value of the version of the package listed in distroverpkg. This defaults to the ver-
sion of ‘redhat-release’ package.

$arch This will be replaced with your architecture as listed by os.uname()[4] in Python.

$basearch This will be replaced with your base architecture in yum. For example, if your $arch is i686 your  $basearch  will  be
i386.

$YUM0-$YUM9  These  will be replaced with the value of the shell environment variable of the same name. If the shell environment
variable does not exist then the configuration file variable will not be replaced.

/usr/bin/python -c 'import yum, pprint; yb = yum.YumBase(); pprint.pprint(yb.conf.yumvar, width=1)'

{'arch': 'ia32e',
 'basearch': 'x86_64',
 'releasever': '5'}

{'arch': 'ia32e',
 'basearch': 'x86_64',
 'releasever': '$releasever'}

distroverpkg  The package used by yum to determine the "version" of the distribution. This can be any installed package. Default
is ‘redhat-release’. You can see what provides this manually by using: "yum whatprovides redhat-release".

10:centos-release-5-10.el5.centos.x86_64 : CentOS release file
Repo        : base
Matched from:
Other       : redhat-release

10:centos-release-5-10.el5.centos.x86_64 : CentOS release file
Repo        : installed
Matched from:
Other       : Provides-match: redhat-release