$ git clone -n https://src.fedoraproject.org/rpms/perl-User-Identity.git /var/lib/mock/f45-build-27353-622/root/chroot_tmpdir/scmroot/perl-User-Identity
Cloning into '/var/lib/mock/f45-build-27353-622/root/chroot_tmpdir/scmroot/perl-User-Identity'...
$ git fetch origin f46822404859f1edec6eda0c10c9b6cf71cfdc52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-User-Identity
 * [new ref]         f46822404859f1edec6eda0c10c9b6cf71cfdc52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f468224 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild