build: stop rebuilding the Flatpak dependencies on every run (#15501)

.github/workflows/build_all.yml

@@ -279,20 +279,24 @@ jobs:
         echo "date=$(date +'%Y%m%d')" >> $GITHUB_ENV
         echo "git_commit_hash=$git_commit_hash" >> $GITHUB_ENV
       shell: bash
+    - name: Compute the flatpak-builder cache key
+      id: fp_cache_key
+      run: echo "key=flatpak-builder-${{ matrix.variant.arch }}-${{ hashFiles('deps/**', 'scripts/flatpak/com.orcaslicer.OrcaSlicer.yml', 'scripts/flatpak/make_deps_tar.sh') }}" >> "$GITHUB_OUTPUT"
+      shell: bash
     # Manage flatpak-builder cache externally so PRs restore but never upload
     - name: Restore flatpak-builder cache
       if: github.event_name == 'pull_request'
       uses: actions/cache/restore@v6
       with:
         path: .flatpak-builder
-        key: flatpak-builder-${{ matrix.variant.arch }}-${{ github.event.pull_request.base.sha }}
+        key: ${{ steps.fp_cache_key.outputs.key }}
         restore-keys: flatpak-builder-${{ matrix.variant.arch }}-
     - name: Save/restore flatpak-builder cache
       if: github.event_name != 'pull_request'
       uses: actions/cache@v6
       with:
         path: .flatpak-builder
-        key: flatpak-builder-${{ matrix.variant.arch }}-${{ github.sha }}
+        key: ${{ steps.fp_cache_key.outputs.key }}
         restore-keys: flatpak-builder-${{ matrix.variant.arch }}-
     - name: Disable debug info for faster CI builds
       run: |
@@ -304,6 +308,12 @@ jobs:
         sed -i "/name: OrcaSlicer/{n;s|buildsystem: simple|buildsystem: simple\n    build-options:\n      env:\n        git_commit_hash: \"$git_commit_hash\"|}" \
           scripts/flatpak/com.orcaslicer.OrcaSlicer.yml
       shell: bash
+    - name: Check the manifest keeps orca_deps cacheable
+      run: ./scripts/flatpak/check_manifest_cacheable.sh
+      shell: bash
+    - name: Pack deps/ for the Flatpak manifest
+      run: ./scripts/flatpak/make_deps_tar.sh
+      shell: bash
     - uses: flatpak/flatpak-github-actions/flatpak-builder@master
       with:
         bundle: OrcaSlicer-Linux-flatpak_${{ env.ver }}_${{ matrix.variant.arch }}.flatpak

build_flatpak.sh

@@ -260,6 +260,9 @@ if [[ ! -f "./scripts/flatpak/com.orcaslicer.OrcaSlicer.yml" ]]; then
     exit 1
 fi
 
+echo -e "${YELLOW}Packing deps/ for the manifest...${NC}"
+./scripts/flatpak/make_deps_tar.sh
+
 # Build the Flatpak
 echo -e "${YELLOW}Building Flatpak package...${NC}"
 echo -e "This may take a while (30+ minutes depending on your system)..."

scripts/build_flatpak_with_docker.sh

@@ -122,6 +122,9 @@ sed "/name: OrcaSlicer/{
 \1    git_commit_hash: \"$GIT_COMMIT_HASH\"|
 }" > "$MANIFEST_DOCKER"
 
+# ---------- pack deps/ ----------
+./scripts/flatpak/make_deps_tar.sh
+
 # ---------- run build in Docker ----------
 DOCKER="${DOCKER:-docker}"
 

scripts/flatpak/.gitignore

@@ -1,3 +1,4 @@
 builddir
 .flatpak-builder
 *.docker.yml
+deps.tar*

scripts/flatpak/check_manifest_cacheable.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+# Check a Flatpak manifest for `type: dir` sources at or before the orca_deps
+# module.
+#
+# Usage: check_manifest_cacheable.sh [manifest]
+#        Defaults to com.orcaslicer.OrcaSlicer.yml next to this script.
+#
+# Exits 0 when none are found, 1 when any are, listing them as file:line, and
+# 2 when the manifest is missing or has no orca_deps module.
+
+set -euo pipefail
+
+anchor=orca_deps
+manifest=${1:-$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/com.orcaslicer.OrcaSlicer.yml}
+
+module_re='^  - name: '
+dir_re='(^|[-{,[:space:]])type:[[:space:]]*dir([,}[:space:]]|$)'
+
+if [ ! -f "$manifest" ]; then
+    echo "$manifest: no such file" >&2
+    exit 2
+fi
+
+anchor_start=$(grep -n "${module_re}${anchor}[[:space:]]*$" "$manifest" | cut -d: -f1 || true)
+if [ -z "$anchor_start" ]; then
+    echo "$manifest: no module named '$anchor'; this check needs updating" >&2
+    exit 2
+fi
+
+# First module header after the anchor, or EOF if the anchor is last.
+anchor_end=$(grep -n "$module_re" "$manifest" | cut -d: -f1 |
+             awk -v s="$anchor_start" '$1 > s { print $1; exit }')
+[ -n "$anchor_end" ] || anchor_end=$(awk 'END { print NR + 1 }' "$manifest")
+
+violations=$(awk -v e="$anchor_end" -v f="$manifest" -v mre="$module_re" -v dre="$dir_re" '
+    { sub(/\r$/, "") }
+    /^[[:space:]]*#/ { next }
+    $0 ~ mre { module = $3 }
+    NR < e && $0 ~ dre {
+        printf "%s:%d: %s (module %s)\n", f, NR, $0, module
+    }' "$manifest")
+
+if [ -n "$violations" ]; then
+    printf '%s\n' "$violations" >&2
+    echo >&2
+    echo "flatpak-builder cannot checksum a directory, so each of these makes" >&2
+    echo "$anchor and every module after it rebuild from scratch on every run." >&2
+    echo "See the $anchor sources in this manifest for the tarball used instead." >&2
+    exit 1
+fi
+
+echo "manifest OK: no 'type: dir' source at or before $anchor"

scripts/flatpak/com.orcaslicer.OrcaSlicer.yml

@@ -144,6 +144,7 @@ modules:
       env:
         BUILD_DIR: deps/build_flatpak
     build-commands:
+      - tar xf deps.tar
       - |
         cmake -S deps -B $BUILD_DIR \
           -DFLATPAK=ON \
@@ -169,10 +170,10 @@ modules:
       - /libpython/include
 
     sources:
-      # OrcaSlicer deps/ directory (avoids copying .git from worktree)
-      - type: dir
-        path: ../../deps
-        dest: deps
+      # flatpak-builder cannot checksum a directory, so a `type: dir` here would
+      # rebuild every dependency on every run. Generated by make_deps_tar.sh.
+      - type: file
+        path: deps.tar
 
       # ---------------------------------------------------------------
       # Pre-downloaded dependency archives

scripts/flatpak/make_deps_tar.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+# Pack deps/ into scripts/flatpak/deps.tar for the Flatpak manifest's orca_deps
+# module.
+#
+# Usage: make_deps_tar.sh
+#        Requires GNU tar. On macOS, brew install gnu-tar.
+#
+# The archive is byte-reproducible. Member order, mtimes, ownership and the
+# group/other write bits are pinned, so identical deps/ contents always produce
+# an identical file. deps/build* and deps/DL_CACHE are excluded.
+#
+# Prints the output path, size and sha256.
+
+set -euo pipefail
+
+if [ "$#" -ne 0 ]; then
+    echo "usage: ${0##*/}" >&2
+    exit 2
+fi
+
+tar_bin=$(command -v gtar || command -v tar || true)
+tar_version=$([ -n "$tar_bin" ] && "$tar_bin" --version 2>/dev/null || true)
+case $tar_version in
+    *"GNU tar"*) ;;
+    *) echo "${0##*/}: needs GNU tar; on macOS run 'brew install gnu-tar'" >&2
+       exit 2 ;;
+esac
+
+script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+repo_root=$(cd "$script_dir/../.." && pwd)
+out=$script_dir/deps.tar
+tmp=$out.tmp
+trap 'rm -f "$tmp"' EXIT
+
+"$tar_bin" --format=gnu \
+    --sort=name \
+    --mtime=@0 \
+    --owner=0 --group=0 --numeric-owner \
+    --mode=go-w \
+    --exclude='deps/build*' \
+    --exclude='deps/DL_CACHE' \
+    -cf "$tmp" \
+    -C "$repo_root" deps
+
+mv -f "$tmp" "$out"
+
+if command -v sha256sum >/dev/null 2>&1; then
+    sum=$(sha256sum "$out" | cut -d' ' -f1)
+elif command -v shasum >/dev/null 2>&1; then
+    sum=$(shasum -a 256 "$out" | cut -d' ' -f1)
+else
+    sum=unavailable
+fi
+
+echo "Wrote $out ($(du -h "$out" | cut -f1), sha256 $sum)"

scripts/flatpak/setup_env_ubuntu24.04.sh

@@ -8,8 +8,9 @@ flatpak install flathub org.gnome.Platform//50 org.gnome.Sdk//50 org.freedesktop
 
 ##
 # in OrcaSlicer folder, run following command to build Orca
-# # First time build
-# flatpak-builder --state-dir=.flatpak-builder --keep-build-dirs --user --force-clean build-dir scripts/flatpak/com.orcaslicer.OrcaSlicer.yml
 
-# # Subsequent builds (only rebuilding OrcaSlicer)
+# # First time build
+# ./scripts/flatpak/make_deps_tar.sh && flatpak-builder --state-dir=.flatpak-builder --keep-build-dirs --user --force-clean build-dir scripts/flatpak/com.orcaslicer.OrcaSlicer.yml
+
+# # Subsequent builds (only rebuilding OrcaSlicer; run make_deps_tar.sh first if deps/ changed)
 # flatpak-builder --state-dir=.flatpak-builder --keep-build-dirs --user build-dir scripts/flatpak/com.orcaslicer.OrcaSlicer.yml --build-only=OrcaSlicer