$ git clone -n https://src.fedoraproject.org/rpms/copr-frontend.git /var/lib/mock/f40-build-2514187-61722/root/chroot_tmpdir/scmroot/copr-frontend
Cloning into '/var/lib/mock/f40-build-2514187-61722/root/chroot_tmpdir/scmroot/copr-frontend'...
$ git fetch origin dbcd207295f92021a8528a3b4bbdff697e317e12:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-frontend
 * [new ref]         dbcd207295f92021a8528a3b4bbdff697e317e12 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dbcd207 Update copr-frontend to 1.204-1