$ git clone -n https://src.fedoraproject.org/rpms/icedtea-web.git /var/lib/mock/f39-build-1543302-36552/root/chroot_tmpdir/scmroot/icedtea-web
Cloning into '/var/lib/mock/f39-build-1543302-36552/root/chroot_tmpdir/scmroot/icedtea-web'...
$ git fetch origin 5f47c07d4d1ded6eb8bc7ff888cc6638f4b5abd4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/icedtea-web
 * [new ref]         5f47c07d4d1ded6eb8bc7ff888cc6638f4b5abd4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f47c07 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild