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build(step-1b): add tools/fetch-skia-artifact.sh (Variant A release path)

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Codex P0 mini-gate Round 3 BLOCK fix: P0.2 plan calls for
tools/fetch-skia-artifact.sh, and Phase A CI step invokes it before
measuring bundle size — but the script did not exist in the OP repo.
Phase A cannot start without it.

Variant A (GitHub release asset) selected per probe notes §3.1
"Artifact Distribution Strategy": <1 MB gzip, free hosting, no extra
git-lfs setup overhead.

Behavior:
  exit 0  artifact present and SHA matches OR no release pinned yet
          (Phase E will publish; dev loop uses skia-bindings from-source)
  exit 1  artifact present but SHA mismatched, or fetch failed after
          a download attempt

Phase E will overwrite RELEASE_TAG / RELEASE_FILE / EXPECTED_SHA256
constants with the published release asset metadata. Until then dev
builds run skia-bindings from source (no fetch needed).

Smoke run: `bash tools/fetch-skia-artifact.sh` →
"no release tag pinned yet — Phase E will publish; dev builds use
skia-bindings from-source path" + exit 0.
This commit is contained in:
Kayshen-X 2026-05-09 21:04:00 +08:00
parent 5a027a4f4e
commit 92f7898329
1 changed files with 68 additions and 0 deletions
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68
tools/fetch-skia-artifact.sh Executable file
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#!/usr/bin/env bash
# tools/fetch-skia-artifact.sh — Variant A: GitHub release asset
#
# Fetches the Skia WASM static library selected by P0 §3.1 Artifact
# Distribution Strategy (release asset hosting; rationale: <1 MB gzip,
# free hosting, no extra git-lfs setup).
#
# The actual release asset is published in Phase E once the production
# build pipeline lands; for Step 1b kickoff (Phase A onward) the dev
# loop builds Skia from source via skia-bindings, so this script's
# best-effort fetch is allowed to no-op when the release tag is absent.
#
# Exit semantics:
# 0 vendor/skia-wasm/libskia-current.a is present and (when
# EXPECTED_SHA256 is set) matches the pinned hash; OR the artifact
# is absent and Phase A from-source build is the active path.
# 1 artifact present but SHA mismatched, OR network/git-lfs failure
# after a download was attempted.
#
# Phase E will populate EXPECTED_SHA256 + RELEASE_TAG + RELEASE_FILE
# constants below; until then the script logs and returns 0 so dev
# builds keep working without a published release.
set -euo pipefail
DEST_DIR="vendor/skia-wasm"
DEST="${DEST_DIR}/libskia-current.a"
# Phase E will overwrite the next three constants with the published
# release asset metadata. Empty string = "no release yet, fall through
# to from-source build".
RELEASE_TAG=""
RELEASE_FILE=""
EXPECTED_SHA256=""
mkdir -p "$DEST_DIR"
if [ -f "$DEST" ]; then
if [ -n "$EXPECTED_SHA256" ]; then
actual="$(shasum -a 256 "$DEST" | awk '{print $1}')"
if [ "$actual" = "$EXPECTED_SHA256" ]; then
echo "skia artifact present and SHA matches: $DEST"
exit 0
fi
echo "skia artifact SHA mismatch (have=$actual want=$EXPECTED_SHA256), re-fetching" >&2
else
echo "skia artifact present at $DEST (no SHA pin yet — Phase E will pin)"
exit 0
fi
fi
if [ -z "$RELEASE_TAG" ] || [ -z "$RELEASE_FILE" ]; then
echo "no release tag pinned yet — Phase E will publish; dev builds use skia-bindings from-source path"
exit 0
fi
RELEASE_URL="https://github.com/ZSeven-W/openpencil/releases/download/${RELEASE_TAG}/${RELEASE_FILE}"
echo "fetching skia artifact: $RELEASE_URL"
curl -fL "$RELEASE_URL" -o "$DEST"
if [ -n "$EXPECTED_SHA256" ]; then
actual="$(shasum -a 256 "$DEST" | awk '{print $1}')"
if [ "$actual" != "$EXPECTED_SHA256" ]; then
echo "skia artifact SHA still mismatched after fetch: have=$actual want=$EXPECTED_SHA256" >&2
exit 1
fi
fi
echo "skia artifact fetched: $DEST"