$ git clone -n https://src.fedoraproject.org/rpms/copr-backend.git /var/lib/mock/f39-test-2571851-62247/root/chroot_tmpdir/scmroot/copr-backend
Cloning into '/var/lib/mock/f39-test-2571851-62247/root/chroot_tmpdir/scmroot/copr-backend'...
$ git fetch origin 204b58df44347c9bcc886cbbd548cc073688d917:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-backend
 * [new ref]         204b58df44347c9bcc886cbbd548cc073688d917 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 204b58d Update copr-backend to 1.176-1