Read the IGC version compute-runtime pins, instead of taking the newest (#43)

intel-opencl-icd depends on one exact intel-igc-opencl-2, and the tag was
meant to come from the release notes. It never did: TOOLS_GH_REL_JSON
holds a list when the release was fetched as "latest", jq cannot index an
array with .body, and the error was swallowed. The tag silently stayed
"latest".

That matched by luck until IGC 2.41.5 appeared on 10 September while
26.31.39395.13 still pins 2.40.13, and dpkg started refusing the package.

Unresolved now means empty, and the caller skips OpenCL with a warning
rather than installing a pair dpkg will reject. VA-API is unaffected.

Author: MickLesk

lib/hwaccel.func

@@ -350,15 +350,19 @@ setup_hwaccel() {
 # so that TOOLS_GH_REL_JSON contains the compute-runtime release metadata.
 # Sets the variable named by $1 (default: igc_tag) to the discovered tag.
 # ══════════════════════════════════════════════════════════════════════════════
+# compute-runtime pins the exact intel-igc-opencl-2 it was built against, so the
+# tag has to come from its release notes. Empty means unresolved: installing the
+# newest IGC instead gives a combination dpkg refuses.
 _resolve_igc_tag() {
   local -n _out_ref="${1:-igc_tag}"
-  _out_ref="latest"
-  if [[ -n "${TOOLS_GH_REL_JSON:-}" && -f "$TOOLS_GH_REL_JSON" ]]; then
-    local _body _parsed
-    _body=$(jq -r '.body // empty' "$TOOLS_GH_REL_JSON" 2>/dev/null) || return 0
-    _parsed=$(grep -oP 'intel-graphics-compiler/releases/tag/\K[^\s\)]+' <<<"$_body" | head -1)
-    [[ -n "$_parsed" ]] && _out_ref="$_parsed"
-  fi
+  _out_ref=""
+  [[ -n "${TOOLS_GH_REL_JSON:-}" && -f "$TOOLS_GH_REL_JSON" ]] || return 0
+
+  # The file holds whatever the API returned: one release for a pinned version,
+  # a list for 'latest'.
+  local _body
+  _body=$(jq -r 'if type == "array" then .[0] else . end | .body // empty' "$TOOLS_GH_REL_JSON" 2>/dev/null) || return 0
+  _out_ref=$(grep -oP 'intel-graphics-compiler/releases/tag/\K[^\s\)]+' <<<"$_body" | head -1)
 }
 
 # ══════════════════════════════════════════════════════════════════════════════
@@ -399,14 +403,18 @@ _setup_intel_arc() {
 
       local igc_tag
       _resolve_igc_tag igc_tag
+      if [[ -z "$igc_tag" ]]; then
+        msg_warn "Could not read the IGC version compute-runtime pins - skipping OpenCL. VA-API still works."
+      else
 
-      # Intel Graphics Compiler – pinned to the version compute-runtime expects
-      fetch_and_deploy_gh_release "intel-igc-core" "intel/intel-graphics-compiler" "binary" "$igc_tag" "" "intel-igc-core-2_*_amd64.deb" || true
-      fetch_and_deploy_gh_release "intel-igc-opencl" "intel/intel-graphics-compiler" "binary" "$igc_tag" "" "intel-igc-opencl-2_*_amd64.deb" || true
+        # Intel Graphics Compiler – pinned to the version compute-runtime expects
+        fetch_and_deploy_gh_release "intel-igc-core" "intel/intel-graphics-compiler" "binary" "$igc_tag" "" "intel-igc-core-2_*_amd64.deb" || true
+        fetch_and_deploy_gh_release "intel-igc-opencl" "intel/intel-graphics-compiler" "binary" "$igc_tag" "" "intel-igc-opencl-2_*_amd64.deb" || true
 
-      # Compute Runtime (depends on IGC and gmmlib)
-      fetch_and_deploy_gh_release "intel-opencl-icd" "intel/compute-runtime" "binary" "latest" "" "intel-opencl-icd_*_amd64.deb" || true
-      fetch_and_deploy_gh_release "intel-level-zero-gpu" "intel/compute-runtime" "binary" "latest" "" "libze-intel-gpu1_*_amd64.deb" || true
+        # Compute Runtime (depends on IGC and gmmlib)
+        fetch_and_deploy_gh_release "intel-opencl-icd" "intel/compute-runtime" "binary" "latest" "" "intel-opencl-icd_*_amd64.deb" || true
+        fetch_and_deploy_gh_release "intel-level-zero-gpu" "intel/compute-runtime" "binary" "latest" "" "libze-intel-gpu1_*_amd64.deb" || true
+      fi
     fi
 
     _cs_apt_install_optional intel-media-va-driver-non-free ocl-icd-libopencl1 libvpl2 libmfx-gen1.2 mesa-vulkan-drivers vulkan-tools vainfo intel-gpu-tools
@@ -453,13 +461,17 @@ _setup_intel_modern() {
 
       local igc_tag
       _resolve_igc_tag igc_tag
+      if [[ -z "$igc_tag" ]]; then
+        msg_warn "Could not read the IGC version compute-runtime pins - skipping OpenCL. VA-API still works."
+      else
 
-      # Intel Graphics Compiler – pinned to the version compute-runtime expects
-      fetch_and_deploy_gh_release "intel-igc-core" "intel/intel-graphics-compiler" "binary" "$igc_tag" "" "intel-igc-core-2_*_amd64.deb" || true
-      fetch_and_deploy_gh_release "intel-igc-opencl" "intel/intel-graphics-compiler" "binary" "$igc_tag" "" "intel-igc-opencl-2_*_amd64.deb" || true
+        # Intel Graphics Compiler – pinned to the version compute-runtime expects
+        fetch_and_deploy_gh_release "intel-igc-core" "intel/intel-graphics-compiler" "binary" "$igc_tag" "" "intel-igc-core-2_*_amd64.deb" || true
+        fetch_and_deploy_gh_release "intel-igc-opencl" "intel/intel-graphics-compiler" "binary" "$igc_tag" "" "intel-igc-opencl-2_*_amd64.deb" || true
 
-      # Compute Runtime
-      fetch_and_deploy_gh_release "intel-opencl-icd" "intel/compute-runtime" "binary" "latest" "" "intel-opencl-icd_*_amd64.deb" || true
+        # Compute Runtime
+        fetch_and_deploy_gh_release "intel-opencl-icd" "intel/compute-runtime" "binary" "latest" "" "intel-opencl-icd_*_amd64.deb" || true
+      fi
     fi
 
     _cs_apt_install_optional intel-media-va-driver-non-free ocl-icd-libopencl1 mesa-vulkan-drivers vulkan-tools vainfo libmfx-gen1.2 intel-gpu-tools