$ git clone -n https://src.fedoraproject.org/rpms/perl-File-BaseDir.git /var/lib/mock/f45-build-23464-597/root/chroot_tmpdir/scmroot/perl-File-BaseDir
Cloning into '/var/lib/mock/f45-build-23464-597/root/chroot_tmpdir/scmroot/perl-File-BaseDir'...
$ git fetch origin addb487c8b3681c48f28d4e8861cbbbed33f2d8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-File-BaseDir
 * [new ref]         addb487c8b3681c48f28d4e8861cbbbed33f2d8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at addb487 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild