$ git clone -n https://src.fedoraproject.org/rpms/libmanette.git /var/lib/mock/f42-build-side-1-3523537-46210/root/chroot_tmpdir/scmroot/libmanette
Cloning into '/var/lib/mock/f42-build-side-1-3523537-46210/root/chroot_tmpdir/scmroot/libmanette'...
$ git fetch origin a0fa98f55230bc8afbcd8163040d977bece76794:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmanette
 * [new ref]         a0fa98f55230bc8afbcd8163040d977bece76794 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0fa98f Update to 0.2.12