$ git clone -n https://github.com/xcp-ng-rpms/qemu.git /var/lib/mock/v8.3-incoming-9549-28299/root/chroot_tmpdir/scmroot/qemu
Cloning into '/var/lib/mock/v8.3-incoming-9549-28299/root/chroot_tmpdir/scmroot/qemu'...
$ git fetch origin 41ff81fcbc9553e6c606b1aeebd78bf5dcc7b700:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/qemu
 * [new ref]         41ff81fcbc9553e6c606b1aeebd78bf5dcc7b700 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 41ff81f Merge branch 'XS-8.3' into 8.3-rebase-XS-4.2.1-5.2.14