build.sh SDK bootstrap tells you what's actually missing - #2118
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nice, ive seen that once or twice before but not spent enough time looking at it. Thanks Claude @NickJosevski
…nd perl build.sh uses the machine's dotnet if `dotnet --version` succeeds, and otherwise downloads an SDK. That fallback shells out to curl and perl, neither of which is guaranteed in our Linux execution containers, so the first symptom is an opaque `exit 127` from a missing tool. That misleads twice over: reaching the fallback at all means `dotnet --version` failed, which is almost always global.json pinning an SDK the machine does not have. The "command not found" points away from the cause. - Log why the bootstrap ran, and list the SDKs that are installed - Use wget when curl is absent; name the problem when neither exists - Use sed when perl is absent Verified with the SDK install stubbed, in the containers that actually broke: amazonlinux:2 (curl, no perl) and debian:12 +wget (no curl) now complete the bootstrap instead of exiting 127; with neither downloader present it fails with a named error; and SDK 8 against a global.json pinning 10.0.302 now reports "global.json likely pins an SDK that is not installed (found: 8.0.423)". The sed fallback returns 8.0.419 for this repo's global.json, matching perl. A machine that already satisfies global.json still skips the bootstrap entirely. Deliberately out of scope: the hardcoded DOTNET_CHANNEL="8.0" (belongs with the .NET 10 work), and build.ps1 (Windows ships curl.exe and needs no perl). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Background
build.shuses the machine'sdotnetifdotnet --versionsucceeds, and otherwise downloads anSDK. That fallback shells out to curl and perl.
Neither is guaranteed in our Linux containers, so you get:
Changes
wgetwhen nocurl==> or says if can't find eithersedwhen noperlTesting
amazonlinux:2(curl, no perl)perl: command not found, exit 127debian:12+ wget (no curl)curl: command not found, exit 127curl: command not found, exit 127Unable to download … - neither curl nor wget is available, exit 1global.jsonpins10.0.302'dotnet --version' failed - global.json likely pins an SDK that is not installed (found: 8.0.423)🤖 Generated with Claude Code