$ git clone -n https://src.fedoraproject.org/rpms/perl-Sys-Statistics-Linux.git /var/lib/mock/f45-build-26361-617/root/chroot_tmpdir/scmroot/perl-Sys-Statistics-Linux
Cloning into '/var/lib/mock/f45-build-26361-617/root/chroot_tmpdir/scmroot/perl-Sys-Statistics-Linux'...
$ git fetch origin 94b9fec2811aaf2adb2e28b44f704e0e21abe648:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sys-Statistics-Linux
 * [new ref]         94b9fec2811aaf2adb2e28b44f704e0e21abe648 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94b9fec Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild