$ git clone -n https://src.fedoraproject.org/rpms/nginx.git /var/lib/mock/f38-build-722716-98936/root/chroot_tmpdir/scmroot/nginx
Cloning into '/var/lib/mock/f38-build-722716-98936/root/chroot_tmpdir/scmroot/nginx'...
$ git fetch origin ef40967cd26ab2dfe88edca09226cc63ebee8abc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nginx
 * [new ref]         ef40967cd26ab2dfe88edca09226cc63ebee8abc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef40967 update to 1.24.0