ignatenkobrain added a new comment to an issue you are following:
``
* Why to use `-build` repo directly? Because this is exactly what koji uses to build
packages and composes are missing some packages from there (e.g. glibc32)
* We use source repos to get BuildRequires of some particular package to find them
recursively (aka which packages are needed in order to build bash systemd and dnf)
* Another point for using `-build` repos is to detect dependency grow as soon as possible
to prevent composes growing
``
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https://pagure.io/releng/issue/6827