This fixes the case where log rotation fails on Windows while there are
clients reading container logs.
Evicts readers if there is an error during rotation and try rotation again.
This is needed for Windows with this scenario:
1. `docker logs -f` is called
2. Log rotation occurs (log.txt -> log.txt.1, truncate and re-open
log.txt)
3. Log rotation occurs again (rm log.txt.1, log.txt -> log.txt.1)
On step 3, before this change, the log rotation will fail with `Access
is denied`.
In this case, what we have is a reader holding a file handle to the
primary log file. The log file is then rotated, but the reader still has
a the handle open. `FILE_SHARE_DELETE` allows this to happen... but then
we try to do it again for the next rotation and it blows up.
So when it blows up we force all the readers to disconnect, close the
log file, and try rotation again, which will succeed based on the added
tests.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This makes sure, on Windows, that all files are opened with
FILE_SHARE_DELETE.
On non-Windows this just calls the same `os.Open()`.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This fixes issues where one goroutine tries to delete or rename a file
while another goroutine has the file open (e.g. a log reader).
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
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