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fix(mmds): Set Content-Type header correctly #5226

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Merged
merged 2 commits into from
May 28, 2025

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zulinx86
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Changes

See CHANGELOG

Reason

The MMDS response "Content-Type" header was always "application/json"
regardless of the request "Accept" header, although MMDS responds
different contents depending on the "Accept" header. Without "Accept"
header or with empty "Accept:" or "Accept: */*", micro-http defaults
to "Accept: text/plain". In such a case, MMDS behaves like IMDS and
the response content is plain text, so "Content-Type" should be
"text/plain".

License Acceptance

By submitting this pull request, I confirm that my contribution is made under
the terms of the Apache 2.0 license. For more information on following Developer
Certificate of Origin and signing off your commits, please check
CONTRIBUTING.md.

PR Checklist

  • I have read and understand CONTRIBUTING.md.
  • I have run tools/devtool checkstyle to verify that the PR passes the
    automated style checks.
  • I have described what is done in these changes, why they are needed, and
    how they are solving the problem in a clear and encompassing way.
  • [ ] I have updated any relevant documentation (both in code and in the docs)
    in the PR.
  • I have mentioned all user-facing changes in CHANGELOG.md.
  • [ ] If a specific issue led to this PR, this PR closes the issue.
  • [ ] When making API changes, I have followed the
    Runbook for Firecracker API changes.
  • I have tested all new and changed functionalities in unit tests and/or
    integration tests.
  • [ ] I have linked an issue to every new TODO.

  • This functionality cannot be added in rust-vmm.

@zulinx86 zulinx86 enabled auto-merge (rebase) May 28, 2025 10:52
@zulinx86 zulinx86 added the Status: Awaiting review Indicates that a pull request is ready to be reviewed label May 28, 2025
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codecov bot commented May 28, 2025

Codecov Report

Attention: Patch coverage is 96.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.94%. Comparing base (1d0f9af) to head (5c4baba).
Report is 2 commits behind head on main.

Files with missing lines Patch % Lines
src/vmm/src/mmds/mod.rs 96.66% 1 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main    #5226      +/-   ##
==========================================
+ Coverage   82.88%   82.94%   +0.06%     
==========================================
  Files         250      250              
  Lines       26942    26965      +23     
==========================================
+ Hits        22330    22367      +37     
+ Misses       4612     4598      -14     
Flag Coverage Δ
5.10-c5n.metal 83.39% <96.66%> (+0.01%) ⬆️
5.10-m5n.metal 83.39% <96.66%> (+0.02%) ⬆️
5.10-m6a.metal 82.60% <96.66%> (+0.01%) ⬆️
5.10-m6g.metal 79.22% <96.66%> (+0.02%) ⬆️
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5.10-m7i.metal-24xl 83.35% <96.66%> (?)
5.10-m7i.metal-48xl 83.35% <96.66%> (?)
5.10-m8g.metal-24xl 79.21% <96.66%> (?)
5.10-m8g.metal-48xl 79.21% <96.66%> (?)
6.1-c5n.metal 83.42% <96.66%> (+<0.01%) ⬆️
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6.1-m6g.metal 79.22% <96.66%> (+0.02%) ⬆️
6.1-m6i.metal 83.42% <96.66%> (+0.01%) ⬆️
6.1-m7a.metal-48xl 82.63% <96.66%> (?)
6.1-m7g.metal 79.22% <96.66%> (+0.02%) ⬆️
6.1-m7i.metal-24xl 83.44% <96.66%> (?)
6.1-m7i.metal-48xl 83.44% <96.66%> (?)
6.1-m8g.metal-24xl 79.21% <96.66%> (?)
6.1-m8g.metal-48xl 79.21% <96.66%> (?)

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@zulinx86 zulinx86 force-pushed the mmds_fix branch 2 times, most recently from 55329c6 to b0e7464 Compare May 28, 2025 12:28
zulinx86 added 2 commits May 28, 2025 12:46
The MMDS response "Content-Type" header was always "application/json"
regardless of the request "Accept" header, although MMDS responds
different contents depending on the "Accept" header. Without "Accept"
header or with empty "Accept:" or "Accept: */*", micro-http defaults
to "Accept: text/plain". In such a case, MMDS behaves like IMDS and
the response content is plain text, so "Content-Type" should be
"text/plain".

Signed-off-by: Takahiro Itazuri <itazur@amazon.com>
test_get_value() lacked coverage for strings. Instead of merely adding
a normal string test, adds a test for a string including escapes.

Signed-off-by: Takahiro Itazuri <itazur@amazon.com>
@zulinx86 zulinx86 merged commit 7560612 into firecracker-microvm:main May 28, 2025
6 of 7 checks passed
@zulinx86 zulinx86 deleted the mmds_fix branch May 28, 2025 13:53
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3 participants