$ git clone -n https://src.fedoraproject.org/rpms/mctc-lib.git /var/lib/mock/f45-build-18174-510/root/chroot_tmpdir/scmroot/mctc-lib
Cloning into '/var/lib/mock/f45-build-18174-510/root/chroot_tmpdir/scmroot/mctc-lib'...
$ git fetch origin 5f98774bfbd041661544e44d4631065c702a3cee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mctc-lib
 * [new ref]         5f98774bfbd041661544e44d4631065c702a3cee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f98774 Switch to using CMake build system and minor cleanup