$ git clone -n https://src.fedoraproject.org/rpms/copr-backend.git /var/lib/mock/f41-build-823369-14353/root/chroot_tmpdir/scmroot/copr-backend
Cloning into '/var/lib/mock/f41-build-823369-14353/root/chroot_tmpdir/scmroot/copr-backend'...
$ git fetch origin 1a2cb30ce93edb446a6434ba2a76dbb4354d1ae0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-backend
 * [new ref]         1a2cb30ce93edb446a6434ba2a76dbb4354d1ae0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a2cb30 Update copr-backend to 1.177-1