$ git clone -n https://src.fedoraproject.org/rpms/php-pecl-yac.git /var/lib/mock/f45-build-28134-628/root/chroot_tmpdir/scmroot/php-pecl-yac
Cloning into '/var/lib/mock/f45-build-28134-628/root/chroot_tmpdir/scmroot/php-pecl-yac'...
$ git fetch origin 9c814b411b13aba3d15bf031b1e38491e28b86f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-pecl-yac
 * [new ref]         9c814b411b13aba3d15bf031b1e38491e28b86f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9c814b4 v2.4.1