$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Synopsis-Expectation.git /var/lib/mock/f45-build-26865-619/root/chroot_tmpdir/scmroot/perl-Test-Synopsis-Expectation
Cloning into '/var/lib/mock/f45-build-26865-619/root/chroot_tmpdir/scmroot/perl-Test-Synopsis-Expectation'...
$ git fetch origin f8d2589838c1c9b5525b0d87ffd7cd1688cb220e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Synopsis-Expectation
 * [new ref]         f8d2589838c1c9b5525b0d87ffd7cd1688cb220e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8d2589 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild