$ git clone -n https://src.fedoraproject.org/rpms/perl-Calendar-Simple.git /var/lib/mock/f45-build-22231-590/root/chroot_tmpdir/scmroot/perl-Calendar-Simple
Cloning into '/var/lib/mock/f45-build-22231-590/root/chroot_tmpdir/scmroot/perl-Calendar-Simple'...
$ git fetch origin 37c419b4230e13a6f270abf9e76e2dece363574c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Calendar-Simple
 * [new ref]         37c419b4230e13a6f270abf9e76e2dece363574c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37c419b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild