rsync - Dec 2011 - [Bug 8682] New: Skip current transfer keyboard function

https://bugzilla.samba.org/show_bug.cgi?id=8682

           Summary: Skip current transfer keyboard function
           Product: rsync
           Version: 3.1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: b1566587 at nwldx.com
         QAContact: rsync-qa at samba.org


rsync should stop transferring the active file upon press of a specific key.

There is already extensive file exclusion functionality, but the ability to
skip the current file (the one visible when using --progress) would be really
quite handy to have.

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https://bugzilla.samba.org/show_bug.cgi?id=8682

--- Comment #1 from martin f. krafft <bugzilla.samba.org at
pobox.madduck.net> ---
A hack is to save the file on the backedu up host, and overwrite the inode,
e.g. "echo > file". This will then cause BackupPC to move on and
log an error.

But indeed, having the information about

  - which file is being processed
  - some metadata, e.g. size
  - when processing started

available in the web interface would be great. Ideally, this would then be
augmented with the ability to cancel/skip this file and optionally to add the
file or the containing directory to the global or host exclude list.

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--- Comment #2 from martin f. krafft <bugzilla.samba.org at
pobox.madduck.net> ---
(the hack is courtesy of Ronny Aasen)

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--- Comment #3 from roland <devzero at web.de> ---
that would be a quite useful feature.

i`d recommend that this feature should be activated with a commandline option
for safety purpose. and skipping should then be repeated while the key is
pressed down, so one could skip multiple files at once or an entire directory
structure (e.g. when accidentally syncing /proc etc)

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--- Comment #4 from Christian Kujau <lists at nerdbynature.de> ---
If this ever gets implemented: instead of (interactively) pressing a key to
interrupt the current transfer of a particular object, I'd like it to also
react to a signal (e.g. SIGUSR1) that can be sent to rsync, even when it's
not
started interactively.

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--- Comment #6 from Joachim Wagner <jwagner at computing.dcu.ie> ---
The "echo > sourcefile" workaround seems to not trigger an error,
at least not
straight away and at least on XFS, but instead speeds up the operation and
stops writing more data to the target file. Observation (both source and target
filesystems are local, 5.7 TB file at 68% at time of intervention):

* Before "echo > sourcefile", rsync -P reported about 200MB/s
* After "echo > sourcefile", rsync -P reports about 650MB/s and the
target
file's mtime and size no longer change
* At 100%, rsync says "read errors mapping "redacted": No data
available (61)
WARNING: redacted failed verification -- update discarded (will try
again)."
and then syncs the 1-byte file created with `echo`.

Still grateful @martin for sharing the idea. I found this searching for a way
to inject an I/O error.

For the source file backup, `cp --reflink=always` is your friend.

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