$ git clone -n https://src.fedoraproject.org/rpms/perl-HTTP-Proxy.git /var/lib/mock/f45-build-24025-601/root/chroot_tmpdir/scmroot/perl-HTTP-Proxy
Cloning into '/var/lib/mock/f45-build-24025-601/root/chroot_tmpdir/scmroot/perl-HTTP-Proxy'...
$ git fetch origin c824678b2cf9ef2b308c57103dcce17edcddc30f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTTP-Proxy
 * [new ref]         c824678b2cf9ef2b308c57103dcce17edcddc30f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c824678 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild