$ git clone -n https://src.fedoraproject.org/rpms/frama-c.git /var/lib/mock/f39-build-2343403-59861/root/chroot_tmpdir/scmroot/frama-c
Cloning into '/var/lib/mock/f39-build-2343403-59861/root/chroot_tmpdir/scmroot/frama-c'...
$ git fetch origin 4a2f9ebc5aa4d5c0ba56a439c4cb6a65cea57ff5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/frama-c
 * [new ref]         4a2f9ebc5aa4d5c0ba56a439c4cb6a65cea57ff5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a2f9eb Version 28.0