$ git clone -n https://src.fedoraproject.org/rpms/mellowplayer.git /var/lib/mock/f41-build-side-1-3061924-38486/root/chroot_tmpdir/scmroot/mellowplayer
Cloning into '/var/lib/mock/f41-build-side-1-3061924-38486/root/chroot_tmpdir/scmroot/mellowplayer'...
$ git fetch origin cecb51258969cbadf7cf4573a437c5a9d5e1326d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mellowplayer
 * [new ref]         cecb51258969cbadf7cf4573a437c5a9d5e1326d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cecb512 convert GPLv2 license to SPDX