$ git clone -n https://src.fedoraproject.org/rpms/R-rvest.git /var/lib/mock/f41-build-1017424-17932/root/chroot_tmpdir/scmroot/R-rvest
Cloning into '/var/lib/mock/f41-build-1017424-17932/root/chroot_tmpdir/scmroot/R-rvest'...
$ git fetch origin ec8e9dab3aa9ebefc0f547fed619b3dcf66cae6d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rvest
 * [new ref]         ec8e9dab3aa9ebefc0f547fed619b3dcf66cae6d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec8e9da Eliminate use of obsolete %patchN syntax (#2283636)