flatpak: use archive for zigimg

The fork in use force pushes too much, making the requested commit
unreachable from default branch.

Add a mechanism to allow working around this issue by fetching commit
archive from GitHub directly.

Author: alaviss

flatpak/build-support/check-zig-cache.sh

@@ -45,6 +45,32 @@ decode_hash() {
   echo "$input" | base64 -d | od -vAn -t x1 | tr -d ' \n'
 }
 
+# Download GitHub source code as an archive and print out its
+# URL and sha256sum.
+#
+# Use for packages that are force-pushed frequently.
+github_archive() {
+  url=$2
+  git_commit=$3
+
+  if [[ ! $url =~ https://github\.com/* ]]; then
+    echo -e "\nERROR: '$url' is not a github url" >&2
+    return 1
+  fi
+
+  archive=$url/archive/${git_commit}.tar.gz
+  echo -e "\nDownloading '$archive'..." >&2
+  sha256=$(curl -Lq "$archive" | sha256sum - | cut -d' ' -f1)
+
+  printf "%s\n" archive "$archive" "" "$sha256"
+}
+
+# Special handling for troublesome sources
+declare -A workarounds=(
+  # TUSF/zigimg force pushes a lot, orphaning the requested commit
+  [https://github.com/TUSF/zigimg]=github_archive
+)
+
 ROOT="$(realpath "$(dirname "$0")/../../")"
 ZIG_PACKAGES_JSON="$ROOT/flatpak/zig-packages.json"
 BUILD_ZIG_ZON_JSON="$ROOT/build.zig.zon.json"
@@ -72,6 +98,15 @@ while read -r url sha256 dest; do
     url=${url%%#*}
   fi
 
+  workaround=${workarounds[$url]-}
+  if [[ -n "$workaround" ]]; then
+    mapfile -t transform < <("$workaround" "$src_type" "$url" "$git_commit" "$sha256")
+    src_type=${transform[0]}
+    url=${transform[1]}
+    git_commit=${transform[2]}
+    sha256=${transform[3]}
+  fi
+
   jq \
     -nec \
     --arg type "$src_type" \

flatpak/zig-packages.json

@@ -37,9 +37,9 @@
   },
   {
     "type": "archive",
-    "url": "https://github.com/jcollie/ghostty-gobject/releases/download/0.14.0-2025-03-11-16-1/ghostty-gobject-0.14.0-2025-03-11-16-1.tar.gz",
-    "dest": "vendor/p/gobject-0.2.0-Skun7H6DlQDWCiNQtdE5TXYcCvx7MyjW01OQe5M_n_jV",
-    "sha256": "78c992f68cac661787c12082be63944832663fdccdedc02beaaa8321bcfa1266"
+    "url": "https://github.com/jcollie/ghostty-gobject/releases/download/0.14.0-2025-03-18-21-1/ghostty-gobject-0.14.0-2025-03-18-21-1.tar.zst",
+    "dest": "vendor/p/gobject-0.2.0-Skun7IWDlQAOKu4BV7LapIxL9Imbq1JRmzvcIkazvAxR",
+    "sha256": "85672997459ddd7c9d4fe458efe548a315cf842cde95ed48a7be984a1f8a98b2"
   },
   {
     "type": "archive",
@@ -186,10 +186,10 @@
     "sha256": "13bec6675e403d86db3b55b39ae262f1e1bdfe24056dcd82824341c6308b5219"
   },
   {
-    "type": "git",
-    "url": "https://github.com/TUSF/zigimg",
-    "commit": "0ce4eca3560d5553b13263d6b6bb72e146dd43d0",
-    "dest": "vendor/p/zigimg-0.1.0-lly-O4heEADSRxoTwJwrD3TBfUob9052sIgb9SL8Iz-A"
+    "type": "archive",
+    "url": "https://github.com/TUSF/zigimg/archive/0ce4eca3560d5553b13263d6b6bb72e146dd43d0.tar.gz",
+    "dest": "vendor/p/zigimg-0.1.0-lly-O4heEADSRxoTwJwrD3TBfUob9052sIgb9SL8Iz-A",
+    "sha256": "002a334b8a82aea2ea06795a0836350fea78cb74cfc88e9b8efc6e0f506590fa"
   },
   {
     "type": "archive",