[Yum] Problematic 'yum' repository paths using --installroot option

[Peter Willis]

>Well, that is strange; $releasever doesn't seem to be used in any of
>those URLs.  Can you maybe post the output of the error that you're
>getting while trying to refresh repositories or similar?  (e.g. "yum
>repolist")

Just to clarify, this problem only manifests with the '--installroot' option applied to yum.
Under normal package management operations everything works fine.

I am wondering how yum derives the URLs from the system config variables.
There appears to be a simple issue of URL encoding of the string '$slreleasesver'  rather than its assigned value.
How does yum generate those URLs, for the path to the online distribution files, with the '--installroot'  flag enacted?
Yum finds the current distribution just fine.

Here is the output of the output of 'yum repolist':

 [/]# yum repolist

Loaded plugins: langpacks
repo id                                                 repo name                                                                            status
epel/x86_64                                             Extra Packages for Enterprise Linux 7 - x86_64                                       13,517
google-chrome                                           google-chrome                                                                             3
repos/x86_64                                            Scientific Linux repos - x86_64                                                          22
sl/x86_64                                               Scientific Linux 7x - x86_64                                                         10,189
sl-extras/x86_64                                        Scientific Linux Extras - x86_64                                                      1,343
sl-fastbugs/x86_64                                      Scientific Linux 7x - x86_64 - bugfix updates                                           748
sl-security/x86_64                                      Scientific Linux 7x - x86_64 - security updates                                         410
repolist: 26,232
[/]#


Peter