$ git clone -n https://src.fedoraproject.org/rpms/perl-Chemistry-File-XYZ.git /var/lib/mock/f45-build-22275-590/root/chroot_tmpdir/scmroot/perl-Chemistry-File-XYZ
Cloning into '/var/lib/mock/f45-build-22275-590/root/chroot_tmpdir/scmroot/perl-Chemistry-File-XYZ'...
$ git fetch origin c28af8db1b4c74cabf35b74a0bbd30cf909278b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Chemistry-File-XYZ
 * [new ref]         c28af8db1b4c74cabf35b74a0bbd30cf909278b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c28af8d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild