Update cache is complete check (#224)

An additional cache case to consider.

Author: taalexander

.github/workflows/lint.yml

@@ -78,16 +78,20 @@ jobs:
         working-directory: build
         run: |
           export CONAN_LLVM_GIT_CACHE="${{ runner.temp }}/llvm-project"
-          build_requires=$(conan info .. -pr:h default -pr:b default --build=outdated 2>/dev/null)
-          if [[ "$build_requires" == *"Outdated package!"* ]];
+          conan info .. -pr:h default -pr:b default --build=outdated --json build_requires.json
+          build_requires=$(cat build_requires.json)
+          if [[ "$build_requires" == *"[]"* ]];
           then
-              all_in_cache=false
-          else
               all_in_cache=true
+          else
+              all_in_cache=false
           fi
           echo "all_in_cache=$all_in_cache" >> $GITHUB_OUTPUT
           echo "Conan build requires: $build_requires"
           echo "Conan cache is complete: $all_in_cache"
+      # If we have a cache miss on 'main', clear the cache.
+      # A dependency was updated, so we need to drop the old one
+      # to prevent unbounded cache growth over time.
       - name: Conan install
         id: conan_install
         working-directory: build

.github/workflows/test.yml

@@ -62,12 +62,13 @@ jobs:
         working-directory: build
         run: |
           export CONAN_LLVM_GIT_CACHE="${{ runner.temp }}/llvm-project"
-          build_requires=$(conan info .. -pr:h default -pr:b default --build=outdated 2>/dev/null)
-          if [[ "$build_requires" == *"Outdated package!"* ]];
+          conan info .. -pr:h default -pr:b default --build=outdated --json build_requires.json
+          build_requires=$(cat build_requires.json)
+          if [[ "$build_requires" == *"[]"* ]];
           then
-              all_in_cache=false
-          else
               all_in_cache=true
+          else
+              all_in_cache=false
           fi
           echo "all_in_cache=$all_in_cache" >> $GITHUB_OUTPUT
           echo "Conan build requires: $build_requires"

requirements-dev.txt

@@ -1,6 +1,6 @@
 breathe
 cmake>=3.23
-conan==1.59.0
+conan==1.62.0
 Jinja2==3.0.3 # https://github.com/sphinx-doc/sphinx/issues/10291
 lit>=12.0.0
 markupsafe==2.0.1