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ci: self-provision python + cross toolchain in kernel-build job

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Make the self-hosted kernel-build runnable with zero manual toolchain/python setup
on the runner host (docs/ci-cd.md steps 3-4 move into the workflow):

- build/build-kernel.sh: honor a caller-provided CROSS_COMPILE (default stays the
  Luckfox uclibc prefix). The kernel is freestanding, so a generic arm cross
  compiler links it.
- kernel-build job: set CROSS_COMPILE=arm-linux-gnueabihf- (Debian
  gcc-arm-linux-gnueabihf, already on 0640) instead of depending on the ephemeral
  SDK checkout path; symlink python->python3 into $RUNNER_TEMP/bin on $GITHUB_PATH
  for the bare-`python` SDK quirk.
- docs/ci-cd.md: only steps 1-2 (systemd service + cgroup cap) still need 0640 sudo.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017wB8KB3MMQztRDXCMCkPrf
This commit is contained in:
BFE Engineering
2026-08-25 16:27:21 -06:00
co-authored by Claude Opus 4.8
parent 4f060db1b1
commit 5a9432b8bc
3 changed files with 30 additions and 13 deletions
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build/build-kernel.sh
+7 -2
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@@ -77,10 +77,15 @@ done
# 4. configure
log "configuring (warden_defconfig)"
cp "$HERE/warden_defconfig" "$SRC/.config"
export ARCH=arm CROSS_COMPILE=arm-rockchip830-linux-uclibcgnueabihf-
# CROSS_COMPILE defaults to the Luckfox SDK uclibc prefix (set SDK_TC to its bin/),
# but the kernel is freestanding, so a caller may override with a generic arm cross
# toolchain instead — e.g. CROSS_COMPILE=arm-linux-gnueabihf- (in Debian's
# gcc-arm-linux-gnueabihf), which the CI runner already has on PATH.
export ARCH=arm
export CROSS_COMPILE="${CROSS_COMPILE:-arm-rockchip830-linux-uclibcgnueabihf-}"
if [ -n "${SDK_TC:-}" ]; then export PATH="$SDK_TC:$PATH"; fi
command -v "${CROSS_COMPILE}gcc" >/dev/null \
|| { echo "cross toolchain ${CROSS_COMPILE}gcc not on PATH (set SDK_TC)" >&2; exit 1; }
|| { echo "cross toolchain ${CROSS_COMPILE}gcc not on PATH (set SDK_TC, or CROSS_COMPILE to one that is)" >&2; exit 1; }
make -C "$SRC" ARCH=arm CROSS_COMPILE="$CROSS_COMPILE" olddefconfig >/dev/null
# 5. build zImage + the board dtb