$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-UNIXSock.git /var/lib/mock/f45-build-26920-620/root/chroot_tmpdir/scmroot/perl-Test-UNIXSock
Cloning into '/var/lib/mock/f45-build-26920-620/root/chroot_tmpdir/scmroot/perl-Test-UNIXSock'...
$ git fetch origin 1664b3be42a45ef86a0174e05d5d4e33c6813a61:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-UNIXSock
 * [new ref]         1664b3be42a45ef86a0174e05d5d4e33c6813a61 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1664b3b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild