$ git clone -n https://src.fedoraproject.org/rpms/jblas.git /var/lib/mock/f40-build-1904704-25073/root/chroot_tmpdir/scmroot/jblas
Cloning into '/var/lib/mock/f40-build-1904704-25073/root/chroot_tmpdir/scmroot/jblas'...
$ git fetch origin 6912bb094824716e0a821212fe3c2f5d1b1e93a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jblas
 * [new ref]         6912bb094824716e0a821212fe3c2f5d1b1e93a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6912bb0 Rebuilt for java-21-openjdk as system jdk