$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-File-Contents.git /var/lib/mock/f45-build-26654-618/root/chroot_tmpdir/scmroot/perl-Test-File-Contents
Cloning into '/var/lib/mock/f45-build-26654-618/root/chroot_tmpdir/scmroot/perl-Test-File-Contents'...
$ git fetch origin 70deb4236a3822146be7e9354b6a202256412835:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-File-Contents
 * [new ref]         70deb4236a3822146be7e9354b6a202256412835 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 70deb42 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild