[Bug 10196] New: tail -F loses information during log rotation

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=10196

            Bug ID: 10196
           Summary: tail -F loses information during log rotation
           Product: Busybox
           Version: 1.23.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: jpc at loee.pl
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Hi,

I am using svlogd for logging and tail -F current to follow on them. I noticed
that sometimes I would miss some lines that were added to the files immediately
before they were renamed.

I looked into the code and noticed that (when FOLLOW_RETRY is true) after
sleeping tail immediately checks if the file was replaced (the inode changed)
before it tries to read and print the remaining bytes. As far as I understand
it this means that if the old file was appended to and the renamed it would
miss this information.

Have anyone noticed it before? I probably should write a test case for this and
think about a patch but I would like to hear a second opinion on this first.

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