Howdy IUS community,
Today I was reading about upcoming changes in dnf [0], and I stumbled across a
current feature of yum I had not seen before called "swap". It is available on
RHEL/Centos 7. From the man page:
At it's simplest this is just a simpler way to remove one set of package(s)
and
install another set of package(s) without having to use the "shell" command.
However you can specify different commands to call than just remove or
install,
and you can list multiple packages (it splits using the "--" marker). Note
that
option parsing will remove the first "--" in an argument list on the
command line.
Here are some IUS-specific examples.
yum swap rsync rsync31u
yum swap -- remove php{,-cli,-common} -- install php56u{,-cli,-common}
After some basic testing this functionality seems robust and easy to use. We
currently maintain the yum-plugin-replace package [1]. The yum swap command
appears to have the potential to obsolete this plugin on EL7. Since the
feature doesn't exist on EL5 or EL6, we would of course continue to maintain
the plugin for those releases.
Has anyone used yum swap before? Has anyone run into issues with it? We are
considering updating our documentation to make this the recommended method for
installing IUS packages on EL7.
- Carl
[0]
http://dnf.readthedocs.org/en/latest/cli_vs_yum.html#packages-replacement-without-yum-shell-or-yum-swap
[1]
https://iuscommunity.org/pages/IUSClientUsageGuide.html#upgrading-stock-rhel-packages-to-ius-packages
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