$ sudo port -v selfupdate

--->  Updating MacPorts base sources using rsync

Willkommen auf dem RSYNC-server auf ftp.fau.de.
Nicht all unsere Mirror sind per rsync verfuegbar.

Welcome to the RSYNC daemon on ftp.fau.de.
Not all of our mirrors are available through rsync.

receiving file list ... done

sent 16 bytes  received 55 bytes  47.33 bytes/sec
total size is 85861888  speedup is 1209322.37

Willkommen auf dem RSYNC-server auf ftp.fau.de.
Nicht all unsere Mirror sind per rsync verfuegbar.

Welcome to the RSYNC daemon on ftp.fau.de.
Not all of our mirrors are available through rsync.

receiving file list ... done

sent 16 bytes  received 62 bytes  52.00 bytes/sec
total size is 512  speedup is 6.56
MacPorts base version 2.7.2 installed,
MacPorts base version 2.7.2 downloaded.
--->  Updating the ports tree
Synchronizing local ports tree from rsync://rsync.macports.org/macports/release/tarballs/ports.tar

Willkommen auf dem RSYNC-server auf ftp.fau.de.
Nicht all unsere Mirror sind per rsync verfuegbar.

Welcome to the RSYNC daemon on ftp.fau.de.
Not all of our mirrors are available through rsync.

receiving file list ... done
./
ports.tar
ports.tar.rmd160

sent 69719 bytes  received 76383 bytes  32467.11 bytes/sec
total size is 98777088  speedup is 676.08
Error: Couldn't sync the ports tree: error deleting "/opt/local/var/macports/sources/rsync.macports.org/macports/release/tarballs/ports/perl/p5-moosex-params-validate": file already exists
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.
Error: /opt/local/bin/port: port selfupdate failed: Couldn't sync the ports tree: error deleting "/opt/local/var/macports/sources/rsync.macports.org/macports/release/tarballs/ports/perl/p5-moosex-params-validate": file already exists