$ git clone -n https://src.fedoraproject.org/rpms/frama-c.git /var/lib/mock/f39-build-2433029-60579/root/chroot_tmpdir/scmroot/frama-c
Cloning into '/var/lib/mock/f39-build-2433029-60579/root/chroot_tmpdir/scmroot/frama-c'...
$ git fetch origin bac3d80310ee9405d5e43bbdaef0f1b14d32ad42:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/frama-c
 * [new ref]         bac3d80310ee9405d5e43bbdaef0f1b14d32ad42 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bac3d80 Rebuild for why3 1.7.1