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Check that Placement is not null before trying to access it #2950

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sgiacomel
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If Placement is missing after updating a service with previous placement constraints in a swarm with multiple nodes, it sends the swarm in an unrecoverable state.

closes #2947
closes moby/moby#37883

- What I did
I created a swarm with 2 nodes. I created a service using the docker api with a placement constraint. I then updated the service passing a json load with no Placement field.
moby/moby#37883 (comment)

- How I did it
I mainly used curl to issue docker api calls

- How to test it
I can provide more details

- Description for the changelog
Prevents nil pointer reference in nodeMatches when Placement is null

Signed-off-by: Simone Giacomel sgiacomel@medstack.co

@miklos-martin
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Hi @sgiacomel, could you please rebase this PR to see if the build still fails? I believe the build failure is not connected to this change and there were some commits to master fiddling with protos since this branch was created.

Thanks in advance!

@miklos-martin
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Hi! I'd be happy to open a rebased version of this PR, in case @sgiacomel can't find the time to do it.

sgiacomel and others added 2 commits February 8, 2021 10:25
Signed-off-by: Simone Giacomel <sgiacomel@medstack.co>
Met the requirements if the constraints are empty
@sgiacomel sgiacomel force-pushed the 2947-check-placement-not-null branch from c479e01 to 9cb517e Compare February 8, 2021 15:26
@sgiacomel
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Hi! I'd be happy to open a rebased version of this PR, in case @sgiacomel can't find the time to do it.

Hi, thank you for poking, I just rebased it. @miklos-martin

@codecov
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codecov bot commented Feb 8, 2021

Codecov Report

Merging #2950 (9cb517e) into master (d6592dd) will decrease coverage by 1.56%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2950      +/-   ##
==========================================
- Coverage   61.77%   60.21%   -1.57%     
==========================================
  Files         142      142              
  Lines       23005    20443    -2562     
==========================================
- Hits        14211    12309    -1902     
+ Misses       7303     6661     -642     
+ Partials     1491     1473      -18     

@miklos-martin
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Nice, thanks

@akerouanton
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@sgiacomel Maybe it's worth adding a test case in TestIsTaskDirty and then ping maintainers to ask if they could review/merge this change 🤔

@akerouanton
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@dperny @thaJeztah Could you take a look? 🙂

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