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build: disable StaticWebAssets cache to stop MSB4018 race

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DefineStaticWebAssets.ReadOrCreateCache opens the *.dswa.cache.json
files under obj/.../ via File.OpenRead with no try/catch, so under
parallel solution builds a sharing-violation / TOCTOU race on the cache
file escapes as MSB4018 and fails the whole build (seen on
Yavsc.Blogs during the rc15 solution build).

Set StaticWebAssetsCacheDefineStaticWebAssetsEnabled=false so
CacheManifestPath is empty and ReadOrCreateCache short-circuits to a
no-file-I/O path. The cache is a pure build-speed optimization; no
effect on output correctness, only on incremental rebuild speed of the
wwwroot-light web projects.

Verified: Yavsc.Api (transitive web deps) and Yavsc.Blogs.Tests build
clean, and zero *.dswa.cache.json files are produced.

Refs:
  https://source.dot.net/Microsoft.NET.Sdk.StaticWebAssets.Tasks/DefineStaticWebAssets.Cache.cs.html
  https://github.com/dotnet/sdk/issues/49039

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Paul Schneider 2026-09-19 13:53:25 +01:00
commit 2d8f92dde9
Signed by: notazof
GPG key ID: 1DD5D838E5343B06
1 changed files with 11 additions and 0 deletions
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11
Directory.Build.props
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@ -2,5 +2,16 @@
<PropertyGroup>
<RootNamespace>Yavsc</RootNamespace>
<NoWarn>NU1701, NU1901, NU1902, NU1507</NoWarn>
<!-- Disable the StaticWebAssets build cache (the *.dswa.cache.json
files written under obj/.../ by DefineStaticWebAssets).
ReadOrCreateCache opens them with File.OpenRead and no
try/catch, so under parallel solution builds a sharing
violation / TOCTOU race on the cache file escapes as
MSB4018 and fails the whole build (seen on Yavsc.Blogs
during the rc15 solution build). The cache is a pure
build-speed optimization; turning it off has no effect on
output correctness, only on incremental rebuild speed of
the (wwwroot-light) web projects. -->
<StaticWebAssetsCacheDefineStaticWebAssetsEnabled>false</StaticWebAssetsCacheDefineStaticWebAssetsEnabled>
</PropertyGroup>
</Project>