rsync - May 2016 - [Bug 11893] New: rsync should check local file access permission before connecting to remote end

https://bugzilla.samba.org/show_bug.cgi?id=11893

            Bug ID: 11893
           Summary: rsync should check local file access permission before
                    connecting to remote end
           Product: rsync
           Version: 3.1.2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P5
         Component: core
          Assignee: wayned at samba.org
          Reporter: rami.lehti at gmail.com
        QA Contact: rsync-qa at samba.org

I'm using rsync to transfer large OS image files around and sometimes the
local
permissions change so that the sender does not have access to the source file
any more.

Having previously transferred the file there is already a file of matching size
on the target host. Now attempting the transfer again rsync connects to the
remote end and the remote end begins to do its checks before the transfer
proper. Because the image file is large this will take a long time (10
minutes). 

After this rsync will report the "Permission denied" error for the
local file.

It would be more user-friendly to check the local file access permissions
before doing anything time consuming and exit with an error as soon as
possible.

Please consider changing this behaviour.

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https://bugzilla.samba.org/show_bug.cgi?id=11893

--- Comment #1 from BruXy <martin at analyzere.com> ---
Hello,

I have fallen into the same trap described in this issue:

$ rsync -avvHPS --rsh='ssh' big_cache.tar.bz bruxy at
remote:/mnt/data_cache/
opening connection using: ssh -l bruxy remote rsync --server
-vvlHogDtprSe.iLsfx --partial . /mnt/data_cache/  (10 args)
sending incremental file list
delta-transmission enabled
big_cache.tar.bz 
697,513,154,774 100%  106.35MB/s    1:44:15 (xfr#1, to-chk=0/1)
rsync: mkstemp "/mnt/data_cache/.big_cache.tar.bz.mQWodj" failed:
Permission
denied (13)
total: matches=0  hash_hits=0  false_alarms=0 data=697513154774

sent 697,683,446,175 bytes  received 163 bytes  111,513,377.50 bytes/sec
total size is 697,513,154,774  speedup is 1.00
rsync error: some files/attrs were not transferred (see previous errors) (code
23) at main.c(1183) [sender=3.1.1]


The error message is displayed after this 650 GB file was transferred, but not
saved in the remote directory because of wrong permission. It would be nice to
receive this error sooner :)

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--- Comment #2 from BruXy <martin at analyzere.com> ---
I am using:

rsync  version 3.1.1  protocol version 31

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