wait until runsv is reading from supervise/ok #247
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stevendanna
commented
Aug 28, 2019
libraries/helpers.rb
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| # Opening the pipe for writing should block until the supervisor | ||
| # has opened it for reading. | ||
| ::File.open(path, "w").close() |
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This technically means that the user running chef-client now needs write permission on these pipes. If we are worried about that, we could rescue Errno::EACCES which is no worse than the old behavior.
srenatus
approved these changes
Aug 28, 2019
If the supervise/ok pipe already exists on disk before runsv has started, then existence check here is not enough. Since runsv opens the pipe for reading as part of its startup, we can open it for writing which will block until runsv has called open. A version of this fix has been running in one of our internal projects for some time. Signed-off-by: Steven Danna <[email protected]>
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Description
If the supervise/ok pipe already exists on disk before runsv has
started, then existence check here is not enough.
Since runsv opens the pipe for reading as part of its startup, we can
open it for writing which will block until runsv has called open.
A version of this fix has been running in one of our internal projects
for some time.
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