$ git clone -n https://src.fedoraproject.org/rpms/icedtea-web.git /var/lib/mock/f40-build-789837-136078/root/chroot_tmpdir/scmroot/icedtea-web
Cloning into '/var/lib/mock/f40-build-789837-136078/root/chroot_tmpdir/scmroot/icedtea-web'...
$ git fetch origin acfa2649f66fef543ce5d4b3c3afdfba154fd061:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/icedtea-web
 * [new ref]         acfa2649f66fef543ce5d4b3c3afdfba154fd061 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at acfa264 Rebuilt for java-21-openjdk as system jdk