$ git clone -n https://github.com/xcp-ng-rpms/autoconf.git /var/lib/mock/v8.3-incoming-11254-29611/root/chroot_tmpdir/scmroot/autoconf
Cloning into '/var/lib/mock/v8.3-incoming-11254-29611/root/chroot_tmpdir/scmroot/autoconf'...
$ git fetch origin 025261b7e5d0375f883e398ea22fad01b856800b:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/autoconf
 * [new ref]         025261b7e5d0375f883e398ea22fad01b856800b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 025261b Add gcc-c++ to BuildRequires for check