$ git clone -n https://src.fedoraproject.org/rpms/t-digest.git /var/lib/mock/f40-build-1884393-25049/root/chroot_tmpdir/scmroot/t-digest
Cloning into '/var/lib/mock/f40-build-1884393-25049/root/chroot_tmpdir/scmroot/t-digest'...
$ git fetch origin 5a7c4bc289a607f55be70c4b988193d1d0028e4f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/t-digest
 * [new ref]         5a7c4bc289a607f55be70c4b988193d1d0028e4f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a7c4bc Rebuilt for java-21-openjdk as system jdk