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fix: Ensure bit-for-bit reproducibility of AppImage builds. #193

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Merged
iphydf merged 1 commit into from
Feb 16, 2026
Merged

fix: Ensure bit-for-bit reproducibility of AppImage builds. #193

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42 changes: 29 additions & 13 deletions platform/appimage/build.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -97,6 +97,25 @@ mv squashfs-root "$TOOL_EXTRACT_DIR"
# This line in the appimagetool breaks musl DNS lookups (looking for /EEE/resolv.conf).
sed -i -e 's!/EEE!/etc!g' "$TOOL_EXTRACT_DIR/usr/bin/appimagetool"

# appimagetool (go-appimage) passes -fstime to mksquashfs, which conflicts with
# SOURCE_DATE_EPOCH environment variable. We wrap mksquashfs to strip -fstime,
# allowing it to honor SOURCE_DATE_EPOCH for the superblock as well.
mv "$TOOL_EXTRACT_DIR/usr/bin/mksquashfs" "$TOOL_EXTRACT_DIR/usr/bin/mksquashfs.real"
cat >"$TOOL_EXTRACT_DIR/usr/bin/mksquashfs" <<'EOF'
#!/usr/bin/env bash
args=()
while [[ $# -gt 0 ]]; do
if [[ "$1" == "-fstime" ]]; then
shift 2
else
args+=("$1")
shift
fi
done
exec "$(dirname "$0")/mksquashfs.real" "${args[@]}"
EOF
chmod +x "$TOOL_EXTRACT_DIR/usr/bin/mksquashfs"

export PKG_CONFIG_PATH=/opt/buildhome/lib/pkgconfig

ccache --zero-stats
Expand All @@ -118,13 +137,6 @@ cmake --install _build --prefix "$PROJECT_NAME.AppDir/usr"

ccache --show-stats

# Normalize file permissions and timestamps for reproducibility
echo "Normalizing AppDir..."
find "$PROJECT_APP_DIR" -exec touch -h -d @"$SOURCE_DATE_EPOCH" {} +
find "$PROJECT_APP_DIR" -type d -exec chmod 0755 {} +
find "$PROJECT_APP_DIR" -type f -perm /0111 -exec chmod 0755 {} +
find "$PROJECT_APP_DIR" -type f ! -perm /0111 -exec chmod 0644 {} +

export QTDIR=/opt/buildhome/qt
export LD_LIBRARY_PATH="/opt/buildhome/lib:/opt/buildhome/lib64:$QTDIR/lib"

Expand All @@ -137,15 +149,19 @@ cp -r "$QTDIR/plugins/tls/" "$PROJECT_APP_DIR/$QTDIR/plugins/"

"$TOOL_EXTRACT_DIR/AppRun" -s deploy "$PROJECT_APP_DIR"/usr/share/applications/*.desktop

# Normalize file permissions and timestamps for reproducibility
echo "Normalizing AppDir..."
find "$PROJECT_APP_DIR" -exec touch -h -d @"$SOURCE_DATE_EPOCH" {} +
find "$PROJECT_APP_DIR" -type d -exec chmod 0755 {} +
find "$PROJECT_APP_DIR" -type f -perm /0111 -exec chmod 0755 {} +
find "$PROJECT_APP_DIR" -type f ! -perm /0111 -exec chmod 0644 {} +

# print all links not contained inside the AppDir
LD_LIBRARY_PATH='' find "$PROJECT_APP_DIR" -type f -exec ldd {} \; 2>&1 | grep '=>' | grep -v "$PROJECT_APP_DIR"

# appimagetool (go-appimage) passes -fstime to mksquashfs, which conflicts with
# SOURCE_DATE_EPOCH environment variable.
(
unset SOURCE_DATE_EPOCH
"$TOOL_EXTRACT_DIR/AppRun" "$PROJECT_APP_DIR"
)
# appimagetool (go-appimage) uses SOURCE_DATE_EPOCH for the SquashFS creation
# time if set.
"$TOOL_EXTRACT_DIR/AppRun" "$PROJECT_APP_DIR"

# Deterministic filename
readonly SHA="$(git rev-parse --short HEAD | head -c7)"
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