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Fix resize race with podman exec -it #10683

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merged 1 commit into from
Jun 16, 2021

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Luap99
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@Luap99 Luap99 commented Jun 15, 2021

When starting a process with podman exec -it the terminal is resized
after the process is started. To fix this allow exec start to accept the
terminal height and width as parameter and let it resize right before
the process is started.

Fixes #10560

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openshift-ci bot commented Jun 15, 2021

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Luap99

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@openshift-ci openshift-ci bot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Jun 15, 2021
@Luap99 Luap99 force-pushed the exec-resize branch 3 times, most recently from 13cfb1a to 18f0d40 Compare June 15, 2021 12:24
@@ -272,7 +272,13 @@ func (s *APIServer) registerExecHandlers(r *mux.Router) error {
// description: Detach from the command. Not presently supported.
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This is definitely supported, I don't know why the docs say it isn't.

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mheon commented Jun 16, 2021

Approach LGTM, but the function signatures modified should also have their comments changed to describe the new parameter.

When starting a process with `podman exec -it` the terminal is resized
after the process is started. To fix this allow exec start to accept the
terminal height and width as parameter and let it resize right before
the process is started.

Fixes containers#10560

Signed-off-by: Paul Holzinger <[email protected]>
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rhatdan commented Jun 16, 2021

LGTM

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rhatdan commented Jun 16, 2021

/lgtm
/hold

@openshift-ci openshift-ci bot added the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label Jun 16, 2021
@openshift-ci openshift-ci bot added the lgtm Indicates that a PR is ready to be merged. label Jun 16, 2021
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rhatdan commented Jun 16, 2021

/hold cancel

@openshift-ci openshift-ci bot removed the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label Jun 16, 2021
@openshift-merge-robot openshift-merge-robot merged commit 2509a81 into containers:master Jun 16, 2021
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Uh-oh. My flake catcher detected that the new test flaked (sys podman ubuntu-2104 root host):

# # podman exec -it mystty stty size
# stty: standard input

# #/vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
# #|     FAIL: stty under podman exec reads the correct dimensions
# #| expected: '41 62'
# #|   actual: 'stty: standard input
'
# #\^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

This is really really bad: it means that the test is not reliable, and is going to start flaking in CI.

@Luap99 Luap99 deleted the exec-resize branch April 29, 2022 14:21
@github-actions github-actions bot added the locked - please file new issue/PR Assist humans wanting to comment on an old issue or PR with locked comments. label Sep 21, 2023
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podman exec --tty resizes only after the process is started
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