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feat(dirty-content-fingerprint): xce-build.sh computes dev-loop fingerprint

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Adds an independent dirty_fingerprint computation to xce-build.sh: sha256
over git diff HEAD's output plus the sorted content of untracked,
non-ignored files (git ls-files --others --exclude-standard), truncated to
8 hex chars. Resolves to empty on a clean tree or if the hash computation
itself fails -- commit_id's own computation and -dirty suffix are left
completely untouched. Zero working-tree/index mutation.

Verified independently by review with real builds (HEAD pinned to control
for concurrent background commits): distinguishes different uncommitted
content, reproduces identical fingerprints for identical content, excludes
.gitignore'd files, degrades gracefully under 3 independently-injected
failure modes without aborting the build, applies to every profile, and
leaves the original feature's regression script passing unmodified.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Rongsong Shen 2026-08-21 04:34:00 +00:00
parent 13fc840f8c
commit c9d40ba180
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GPG key ID: 5BCDAAE0123E9FE2
2 changed files with 53 additions and 6 deletions
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51
src/tools/xce-build.sh
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@ -116,7 +116,56 @@ if [ -z "$build_time" ]; then
echo "WARNING: xce-build.sh could not determine build_time (resolved empty) -- version info will be missing/incorrect in this build!" >&2
fi
MESON_OPTS+=(-Dcommit_id="$commit_id" -Dbuild_time="$build_time")
# dirty-content-fingerprint task 2.1: dirty_fingerprint, computed
# INDEPENDENTLY of commit_id above -- commit_id's own computation
# (including its -dirty suffix) is intentionally left untouched by this
# block; this only adds a new, parallel value. Empty when the tree is
# clean, or when the tree is dirty but the hash computation itself fails
# (Requirement 5.1 -- never fabricate a value; commit_id's own untouched
# -dirty suffix already signals "modified" in that fallback case, consumed
# by a later task's --version composition, not here). When the tree is
# dirty and the computation succeeds: a short sha256 prefix over `git diff
# HEAD`'s output (tracked modifications, staged or unstaged) concatenated
# with the raw content of every file `git ls-files --others
# --exclude-standard` lists (untracked, non-ignored -- Requirement 1.4),
# in a stable sorted order for determinism. Zero working-tree mutation --
# reads only, no git add/stash/anything that touches the index or working
# tree.
dirty_fingerprint=""
if [ -n "$(git status --porcelain 2>/dev/null)" ]; then
fp_ok=1
fp_tmp=""
list_tmp=""
if ! fp_tmp="$(mktemp 2>/dev/null)" || [ -z "$fp_tmp" ]; then
fp_ok=0
fi
if [ "$fp_ok" = 1 ] && ! git diff HEAD >"$fp_tmp" 2>/dev/null; then
fp_ok=0
fi
if [ "$fp_ok" = 1 ]; then
if ! list_tmp="$(mktemp 2>/dev/null)" || [ -z "$list_tmp" ]; then
fp_ok=0
elif ! git ls-files -z --others --exclude-standard 2>/dev/null | LC_ALL=C sort -z >"$list_tmp"; then
fp_ok=0
else
while IFS= read -r -d '' f; do
if ! cat -- "$f" >>"$fp_tmp" 2>/dev/null; then
fp_ok=0
break
fi
done <"$list_tmp"
fi
fi
if [ "$fp_ok" = 1 ]; then
if fp="$(sha256sum <"$fp_tmp" 2>/dev/null | cut -c1-8)" && [ -n "$fp" ]; then
dirty_fingerprint="$fp"
fi
fi
[ -n "$fp_tmp" ] && rm -f "$fp_tmp"
[ -n "$list_tmp" ] && rm -f "$list_tmp"
fi
MESON_OPTS+=(-Dcommit_id="$commit_id" -Dbuild_time="$build_time" -Ddirty_fingerprint="$dirty_fingerprint")
usage() {
echo "Usage: $0 [component] [profile|build_dir] [build_dir] [--incremental]"