$ git clone -n https://src.fedoraproject.org/rpms/perl-FCGI-Client.git /var/lib/mock/f45-build-23449-597/root/chroot_tmpdir/scmroot/perl-FCGI-Client
Cloning into '/var/lib/mock/f45-build-23449-597/root/chroot_tmpdir/scmroot/perl-FCGI-Client'...
$ git fetch origin 29ae4340d56fcbd66dfaa2d2b2c7070b9448e532:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-FCGI-Client
 * [new ref]         29ae4340d56fcbd66dfaa2d2b2c7070b9448e532 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29ae434 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild