$ git clone -n https://src.fedoraproject.org/rpms/kblocks.git /var/lib/mock/f39-build-1661632-40663/root/chroot_tmpdir/scmroot/kblocks
Cloning into '/var/lib/mock/f39-build-1661632-40663/root/chroot_tmpdir/scmroot/kblocks'...
$ git fetch origin e4c2377935c4c564b1efafe4eaf24c534bf42f56:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kblocks
 * [new ref]         e4c2377935c4c564b1efafe4eaf24c534bf42f56 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4c2377 23.08.2