$ git clone -n https://src.fedoraproject.org/rpms/perl-Server-Starter.git /var/lib/mock/f45-build-26248-616/root/chroot_tmpdir/scmroot/perl-Server-Starter
Cloning into '/var/lib/mock/f45-build-26248-616/root/chroot_tmpdir/scmroot/perl-Server-Starter'...
$ git fetch origin a5e6655114cb035a6096ae9a32c1e95f420ef047:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Server-Starter
 * [new ref]         a5e6655114cb035a6096ae9a32c1e95f420ef047 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a5e6655 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild