$ git clone -n https://src.fedoraproject.org/rpms/rust-webbrowser.git /var/lib/mock/f40-build-2644463-66506/root/chroot_tmpdir/scmroot/rust-webbrowser
Cloning into '/var/lib/mock/f40-build-2644463-66506/root/chroot_tmpdir/scmroot/rust-webbrowser'...
$ git fetch origin a07b439a50595c56d897b60646159046030f5801:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-webbrowser
 * [new ref]         a07b439a50595c56d897b60646159046030f5801 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a07b439 Update to version 0.8.13; Fixes RHBZ#2267962