$ git clone -n https://src.fedoraproject.org/rpms/nheko.git /var/lib/mock/f40-build-803524-144285/root/chroot_tmpdir/scmroot/nheko
Cloning into '/var/lib/mock/f40-build-803524-144285/root/chroot_tmpdir/scmroot/nheko'...
$ git fetch origin 8afc1265e7da4c06b505114b1e4d0363e8d10283:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nheko
 * [new ref]         8afc1265e7da4c06b505114b1e4d0363e8d10283 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8afc126 Fixed FTBFS on F40+.