$ git clone -n https://src.fedoraproject.org/rpms/python-nh3.git /var/lib/mock/f40-build-769089-125490/root/chroot_tmpdir/scmroot/python-nh3
Cloning into '/var/lib/mock/f40-build-769089-125490/root/chroot_tmpdir/scmroot/python-nh3'...
$ git fetch origin 15913eca61b0fcb5ccbf885d1cb8ee6d1c5dd17d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-nh3
 * [new ref]         15913eca61b0fcb5ccbf885d1cb8ee6d1c5dd17d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15913ec Update to 0.2.15 (fedora#2253477)