$ git clone -n https://src.fedoraproject.org/rpms/java-latest-openjdk.git /var/lib/mock/f39-build-1835965-41920/root/chroot_tmpdir/scmroot/java-latest-openjdk
Cloning into '/var/lib/mock/f39-build-1835965-41920/root/chroot_tmpdir/scmroot/java-latest-openjdk'...
$ git fetch origin 50747e7123ff6577a0d7a44fd75fda479c7774e7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-latest-openjdk
 * [new ref]         50747e7123ff6577a0d7a44fd75fda479c7774e7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50747e7 updated to OpenJDK 21.0.1 (2023-10-17)