josh
43ea845ac0
update-initramfs produces a boot stub (~50 MB) that expects to mount a separate rootfs over squashfs/disk/NFS. Our PXE channel only ships vmlinuz+initrd.img, so the stub had nothing to pivot to — kernel finished hand-off and the system wedged with firmware, modules, and userspace stranded in the 545 MB rootfs dir we never delivered. Replace with an everything-in-initramfs build: cpio.zst the full rootfs (minus /boot) as the initrd, add /init -> sbin/init for the kernel's runtime entrypoint, materialize the kernel symlink into a real file. Bump check-initrd floor to 200 MB and switch the firmware grep from unmkinitramfs (boot-stub-specific) to zstd | cpio -t. Also add cpio to the CI apt deps.
92 lines
3.9 KiB
Makefile
92 lines
3.9 KiB
Makefile
# live-image/Makefile — builds the Debian live image that PXE-booted
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# hosts land in. Requires a Linux host (or WSL) with mkosi installed.
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# On native Windows this Makefile short-circuits with a clear message.
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ifeq ($(OS),Windows_NT)
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UNAME_S := Windows
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else
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UNAME_S := $(shell uname -s)
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endif
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REPO_ROOT := $(abspath ..)
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AGENT_BIN := $(REPO_ROOT)/bin/vetting-agent.linux-amd64
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MKOSI_EXTRA_AGENT := mkosi.extra/usr/local/sbin/vetting-agent
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.PHONY: all check-linux check-initrd repack-initrd agent clean
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all: check-linux $(MKOSI_EXTRA_AGENT)
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mkosi --force build
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$(MAKE) repack-initrd
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$(MAKE) check-initrd
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# mkosi + initramfs-tools produce a *boot stub* initrd (~50 MB) that
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# expects to mount a separate rootfs (squashfs / disk / NFS). Our PXE
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# channel only delivers vmlinuz+initrd.img, so there's nothing for the
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# stub to pivot to and boot wedges right after the kernel hands off.
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#
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# Fix: pack the entire rootfs as the initrd. Kernel unpacks the cpio.zst
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# into tmpfs and runs /init from it — no pivot, no live-boot, no rootfs
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# param. Size balloons to a few hundred MB but that's the real cost of
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# shipping firmware + modules + userspace in a diskless boot.
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repack-initrd:
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@# Materialize symlinked kernel/initrd into real files so downstream
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@# copies (release tarball) don't have to follow links.
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@cp -fL build/vmlinuz build/vmlinuz.real && mv build/vmlinuz.real build/vmlinuz
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@rm -f build/initrd.img build/initrd.img.old build/vmlinuz.old
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@# Kernel execs /init from the unpacked initramfs. systemd-sysv puts
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@# init at /sbin/init; add the top-level symlink the kernel looks for.
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@[ -e build/init ] || ln -sf sbin/init build/init
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@# Skip /boot: holds the old kernel + stub initrd, both superseded.
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@# Write to a sibling temp path so find doesn't race with the
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@# archive being written into the dir it's walking.
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@cd build && \
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find . -path ./boot -prune -o -print0 \
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| cpio --null --create --format=newc --quiet \
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| zstd -T0 -10 -q > ../build.initrd.img.tmp
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@mv build.initrd.img.tmp build/initrd.img
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# Fail the build if the repacked initrd doesn't actually contain the
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# firmware we need. Two failure modes:
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# 1. Packages didn't install (apt/bootstrap misconfigured) → size check.
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# 2. Packages installed but repack-initrd missed /lib/firmware → blob
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# presence check.
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# cpio -t lists the archive; zstd -dc streams it without extracting.
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check-initrd:
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@# With repack-initrd the initrd is the full rootfs (cpio.zst), so
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@# 200 MB is the floor — anything smaller means firmware/userspace
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@# is missing or the repack step silently produced a stub.
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@size=$$(wc -c < build/initrd.img); \
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min=$$((200 * 1024 * 1024)); \
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if [ "$$size" -lt "$$min" ]; then \
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echo "ERROR: initrd.img is $$size bytes (< $$min) — firmware/rootfs almost certainly missing."; \
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echo " Check mkosi build log and repack-initrd output."; \
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exit 1; \
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fi
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@if ! zstd -dc build/initrd.img | cpio -t --quiet 2>/dev/null | grep -q 'lib/firmware/i915/tgl_guc'; then \
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echo "ERROR: i915/tgl_guc firmware missing from initrd."; \
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echo " firmware-misc-nonfree likely didn't install during bootstrap."; \
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exit 1; \
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fi
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@echo "initrd.img OK ($$(du -hL build/initrd.img | cut -f1), i915 firmware present)"
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agent: $(AGENT_BIN)
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$(AGENT_BIN):
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cd $(REPO_ROOT) && GOOS=linux GOARCH=amd64 go build -o $(AGENT_BIN) ./cmd/vetting-agent
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# Stage the prebuilt agent into mkosi.extra/ so mkosi copies it into the
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# image root without the postinst needing to reach outside the source tree.
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$(MKOSI_EXTRA_AGENT): $(AGENT_BIN)
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install -D -m 0755 $< $@
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check-linux:
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ifneq ($(UNAME_S),Linux)
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@echo "ERROR: live-image must be built on Linux (you're on $(UNAME_S))."
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@echo "Run 'wsl make -C live-image all' from Windows instead."
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@exit 1
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endif
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@command -v mkosi >/dev/null 2>&1 || { echo "ERROR: mkosi not installed. Try: apt install mkosi"; exit 1; }
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clean:
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rm -rf build mkosi.output mkosi.cache
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rm -f $(MKOSI_EXTRA_AGENT)
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