cli/connhelper/commandcon.New: pass context with WithoutCancel #5816
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Passing the context to the constructor, but explicitly making it non-cancelable and add a comment describing why context-cancelation should not be propagated. Signed-off-by: Sebastiaan van Stijn <[email protected]>
thaJeztah
added
status/2-code-review
kind/refactor
thaJeztah
commented
Feb 10, 2025
Comment on lines
+36
to
+50
| func New(ctx context.Context, cmd string, args ...string) (net.Conn, error) { | ||
| // Don't kill the ssh process if the context is cancelled. Killing the | ||
| // ssh process causes an error when go's http.Client tries to reuse the | ||
| // net.Conn (commandConn). | ||
| // | ||
| // Not passing down the Context might seem counter-intuitive, but in this | ||
| // case, the lifetime of the process should be managed by the http.Client, | ||
| // not the caller's Context. | ||
| // | ||
| // Further details;; | ||
| // | ||
| // - https://github.com/docker/cli/pull/3900 | ||
| // - https://github.com/docker/compose/issues/9448#issuecomment-1264263721 | ||
| ctx = context.WithoutCancel(ctx) | ||
| c := commandConn{cmd: exec.CommandContext(ctx, cmd, args...)} |
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I was THIS close to passing the context, when I recalled there was some change related to this code to not pass it.
So instead, I passed through the context (which could be used to pass a context logger), and added a WithoutCancel ... and a large comment explaining why to prevent future others (or future self) from reintroducing the issue that was fixed (which may be even more relevant if this code is moved to a separate module)
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #5816 +/- ##
==========================================
+ Coverage 59.29% 59.30% +0.01%
==========================================
Files 353 353
Lines 29540 29550 +10
==========================================
+ Hits 17516 17526 +10
Misses 11043 11043
Partials 981 981 |
vvoland
approved these changes
Feb 11, 2025
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Passing the context to the constructor, but explicitly making it non-cancelable and add a comment describing why context-cancelation should not be propagated.
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