$ git clone -n https://src.fedoraproject.org/rpms/frama-c.git /var/lib/mock/f40-build-789788-136042/root/chroot_tmpdir/scmroot/frama-c
Cloning into '/var/lib/mock/f40-build-789788-136042/root/chroot_tmpdir/scmroot/frama-c'...
$ git fetch origin 1715bd13b7c30d05bfe4a9a6bf78531fed303964:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/frama-c
 * [new ref]         1715bd13b7c30d05bfe4a9a6bf78531fed303964 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1715bd1 Rebuild for why3 1.7.1