I am using backintime for backup which in turn uses rsync to make snapshots. Most filesystems on the computer are XFS, including the rsync target, system is Ubuntu 20.04 with rsync version 3.1.3 protocol version 31.
I get an exit code 2 from rsync which is Protocol incompatibility,
and some digging shows this happens if you are running rsync across some (ssh) connection
between two computers with different rsync versions, or login scripts injecting some unexpected output into the ssh connection. None of that is the case here, this is all local,
see below for the command line.
=> Anymore insights into this rsync error ? How can a local Protocol incompatibility happen
if there is just one /usr/bin/rsync ?
Yours, Steffen
The local USB disk mounted as
type xfs (rw,nosuid,nodev,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota,uhelper=udisks2)
INFO: Call rsync to take the snapshot
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
WARNING: Command "rsync --recursive --times --devices --specials --hard-links --human-readable \
--links --acls --xattrs --perms --executability --group --owner --info=progress2 \
--no-inc-recursive --delete --delete-excluded -v -i \
--out-format=BACKINTIME: %i %n%L --link-dest=../../20210301-082432-781/backup \
--chmod=Du+wx --exclude=/media/sneumann/LinuxBackup/msbi-corei \
--exclude=/root/.local/share/backintime --exclude=.local/share/backintime/mnt \
--exclude=.gvfs --exclude=.cache* --exclude=[Cc]ache* --exclude=.thumbnails* \
--exclude=[Tt]rash* --exclude=*.backup* --exclude=*~ \
--exclude=/home/sneumann/Ubuntu One --exclude=.dropbox* --exclude=/proc/* \
--exclude=/sys/* --exclude=/dev/* --exclude=/run/* --exclude=/media \
--exclude=/root/.local/share/backintime/takesnapshot_.log \
--exclude=/root/.local/share/backintime --include=/ --include=/** \
--exclude=* / /media/sneumann/LinuxBackup/msbi-corei/backintime/msbi-corei/root/1/new_snapshot/backup"
returns 2