$ git clone -n https://src.fedoraproject.org/rpms/perl-WWW-Mechanize.git /var/lib/mock/f45-build-27409-624/root/chroot_tmpdir/scmroot/perl-WWW-Mechanize
Cloning into '/var/lib/mock/f45-build-27409-624/root/chroot_tmpdir/scmroot/perl-WWW-Mechanize'...
$ git fetch origin 88ae206b15fd200cef517360187d89d213bb2713:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-WWW-Mechanize
 * [new ref]         88ae206b15fd200cef517360187d89d213bb2713 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 88ae206 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild