$ git clone -n https://src.fedoraproject.org/rpms/pamixer.git /var/lib/mock/f45-build-21341-583/root/chroot_tmpdir/scmroot/pamixer
Cloning into '/var/lib/mock/f45-build-21341-583/root/chroot_tmpdir/scmroot/pamixer'...
$ git fetch origin 8e96fbc40d2582a874adbf584faa8e225a93d055:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pamixer
 * [new ref]         8e96fbc40d2582a874adbf584faa8e225a93d055 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8e96fbc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild