$ git clone -n https://src.fedoraproject.org/rpms/frama-c.git /var/lib/mock/f40-build-2685365-68015/root/chroot_tmpdir/scmroot/frama-c
Cloning into '/var/lib/mock/f40-build-2685365-68015/root/chroot_tmpdir/scmroot/frama-c'...
$ git fetch origin a0986c8547d896c0d128fc30c7b89b3936913020:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/frama-c
 * [new ref]         a0986c8547d896c0d128fc30c7b89b3936913020 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0986c8 Version 28.1