$ git clone -n https://src.fedoraproject.org/rpms/pdfbox.git /var/lib/mock/f40-build-1912197-25081/root/chroot_tmpdir/scmroot/pdfbox
Cloning into '/var/lib/mock/f40-build-1912197-25081/root/chroot_tmpdir/scmroot/pdfbox'...
$ git fetch origin 11667dcdce5d16d4bae8cf7a7486306f8f3e0057:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pdfbox
 * [new ref]         11667dcdce5d16d4bae8cf7a7486306f8f3e0057 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 11667dc Merge branch 'f40' into rawhide