$ git clone -n https://src.fedoraproject.org/rpms/myst-nb.git /var/lib/mock/f42-build-3272625-41307/root/chroot_tmpdir/scmroot/myst-nb
Cloning into '/var/lib/mock/f42-build-3272625-41307/root/chroot_tmpdir/scmroot/myst-nb'...
$ git fetch origin f76bd61cb8d10ce9e7f6a6c749e11037e5d63a98:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/myst-nb
 * [new ref]         f76bd61cb8d10ce9e7f6a6c749e11037e5d63a98 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f76bd61 Version 1.2.0