build: fetch kernel from cdn.kernel.org static mirror - #23
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## Problem `Build kernel.c` fails intermittently across CI with a 502 while fetching the kernel: ``` curl: (22) The requested URL returned error: 502 make: *** [Makefile:134: tarballs/linux-<ver>.tar.gz] Error 22 ``` libkrunfw fetched the kernel from the **git.kernel.org cgit `/snapshot/` endpoint**, which regenerates a ~250 MB tarball from the git tree per request. It's slow (~50s even when healthy) and rate-limited, so under CI concurrency the cgit backend overloads and the gateway 502s. kernel.org itself is up — only that dynamic endpoint flakes. ## Fix — mirror swap only Bump `vendor/libkrunfw` `e0d29a8a → 56bd24f6`, which changes exactly one thing: `KERNEL_REMOTE` from the git.kernel.org cgit snapshot to the static **cdn.kernel.org** release tarball. **Same kernel (`linux-6.12.95`, unchanged), same patches, same `.tar.gz` / `linux-6.12.95/` layout** — the only delta vs `main` is where the tarball is fetched from. The CDN mirror is cached and instant. ## Notes - Points at libkrunfw branch commit `56bd24f6` until the cdn change lands on `krunfw` (superradcompany/libkrunfw#23); re-point to the `krunfw` commit after that merges. - Fixes the recurring `Build kernel.c` 502s for all builds.
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Problem
Build kernel.cfails intermittently with a 502 while fetching the kernel:KERNEL_REMOTEpoints at the git.kernel.org cgit/snapshot/endpoint, which regenerates a ~250 MB tarball from the git tree per request — slow (~50s even when healthy), rate-limited, and 502-prone under CI concurrency. kernel.org itself is up; only this dynamic endpoint flakes.Fix
Fetch the static release tarball from the kernel.org CDN instead:
Same
.tar.gz, same top-levellinux-<ver>/dir, soKERNEL_TARBALLandtar xfare unchanged — a pure URL swap. The kernel source is identical (both are the release tag), so the patch set applies unchanged.CI note (pre-existing, unrelated to this change)
This branch sits on
krunfwHEAD (linux-6.12.96).check-kernel-version.shnow flags6.12.98as the latest stable and gates the build jobs. Bumping to6.12.98, however, breaks the out-of-tree vsock-dgram patch —virtio_transport_alloc_skbgained an argument in 6.12.98:That patch update is separate maintenance, independent of this mirror swap. The cdn change itself is validated end to end:
Fetch kernel sourcepasses from the CDN, and the kernel builds from the CDN on 6.12.95 in superradcompany/microsandbox#1217's CI.