$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Script-Run.git /var/lib/mock/f45-build-26852-619/root/chroot_tmpdir/scmroot/perl-Test-Script-Run
Cloning into '/var/lib/mock/f45-build-26852-619/root/chroot_tmpdir/scmroot/perl-Test-Script-Run'...
$ git fetch origin 3e8325d2116e7138e23b24a528e166042dd56932:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Script-Run
 * [new ref]         3e8325d2116e7138e23b24a528e166042dd56932 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e8325d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild