Commits on Aug 13, 2024

1. Fix rhui_alias resolution during cache flush [RHELDST-26143] …

   It was intended to take RHUI aliases into account during cache flush,
   but this was not implemented correctly.
   
   The main issue was that alias resolution was only implemented in the
   direction of (src => dest), but in the case of RHUI, we are always
   publishing content on the destination (non-RHUI) side of the alias.
   Hence we need to also consider the aliases in the (dest => src)
   direction to figure out that the src (RHUI) side of the alias is
   relevant for cache flush.
   
   A second issue was that, if multiple aliases were involved in a path, we
   would not flush cache for all of them. This couldn't work because the
   uri_alias function was designed to return only a single value, after
   resolution of all aliases. When multiple aliases are in play, content
   is actually accessible at all the paths calculated during each step of
   the resolution, so we need to keep track of intermediate paths and
   flush cache for all of them.
   
   This now behaves correctly in the typical case of both $releasever and
   RHUI aliases being in play, e.g. for /content/dist/rhel9/9/foo, it will
   now correctly calculate the 4 typical paths under which content is
   accessible:
   
   - /content/dist/rhel9/9/foo
   - /content/dist/rhel9/9.4/foo
   - /content/dist/rhel9/rhui/9/foo
   - /content/dist/rhel9/rhui/9.4/foo

   

   rohanpm committed Aug 13, 2024
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