$ git clone -n https://src.fedoraproject.org/rpms/pdfbox.git /var/lib/mock/f40-build-2536509-61850/root/chroot_tmpdir/scmroot/pdfbox
Cloning into '/var/lib/mock/f40-build-2536509-61850/root/chroot_tmpdir/scmroot/pdfbox'...
$ git fetch origin bdda6cf5813e575e9e892e5aab388606c1f1154c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pdfbox
 * [new ref]         bdda6cf5813e575e9e892e5aab388606c1f1154c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bdda6cf Rebuilt for java-21-openjdk as system jdk