$ git clone -n https://src.fedoraproject.org/rpms/ncompress.git /var/lib/mock/f42-build-side-1-3522731-46188/root/chroot_tmpdir/scmroot/ncompress
Cloning into '/var/lib/mock/f42-build-side-1-3522731-46188/root/chroot_tmpdir/scmroot/ncompress'...
$ git fetch origin dc6dd05e6d9eb241a04cfc52e4cf906f8ec3ad80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ncompress
 * [new ref]         dc6dd05e6d9eb241a04cfc52e4cf906f8ec3ad80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc6dd05 Fix the FTBFS caused by new C23 standard