$ git clone -n https://src.fedoraproject.org/rpms/fedtex.git /var/lib/mock/f40-build-1996329-44004/root/chroot_tmpdir/scmroot/fedtex
Cloning into '/var/lib/mock/f40-build-1996329-44004/root/chroot_tmpdir/scmroot/fedtex'...
$ git fetch origin f8b5357092400ede8aba6305beb2e551acd7a004:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedtex
 * [new ref]         f8b5357092400ede8aba6305beb2e551acd7a004 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8b5357 feat: import srcs (fixes rhbz#2228841)