coverity: allow running on macOS

For completeness' sake, let's add support for submitting macOS builds to
Coverity Scan.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

.github/workflows/coverity.yml

@@ -43,7 +43,7 @@ jobs:
         if: contains(matrix.os, 'windows')
         uses: git-for-windows/setup-git-for-windows-sdk@v1
       - run: ci/install-dependencies.sh
-        if: contains(matrix.os, 'ubuntu')
+        if: contains(matrix.os, 'ubuntu') || contains(matrix.os, 'macos')
         env:
           runs_on_pool: ${{ matrix.os }}
 
@@ -56,10 +56,17 @@ jobs:
           *windows*)
             COVERITY_PLATFORM=win64
             COVERITY_TOOL_FILENAME=cov-analysis.zip
+            MAKEFLAGS=-j$(nproc)
+            ;;
+          *macos*)
+            COVERITY_PLATFORM=macOSX
+            COVERITY_TOOL_FILENAME=cov-analysis.dmg
+            MAKEFLAGS=-j$(sysctl -n hw.physicalcpu)
             ;;
           *ubuntu*)
             COVERITY_PLATFORM=linux64
             COVERITY_TOOL_FILENAME=cov-analysis.tgz
+            MAKEFLAGS=-j$(nproc)
             ;;
           *)
             echo '::error::unhandled OS ${{ matrix.os }}' >&2
@@ -68,6 +75,7 @@ jobs:
           esac
           echo "COVERITY_PLATFORM=$COVERITY_PLATFORM" >>$GITHUB_ENV
           echo "COVERITY_TOOL_FILENAME=$COVERITY_TOOL_FILENAME" >>$GITHUB_ENV
+          echo "MAKEFLAGS=$MAKEFLAGS" >>$GITHUB_ENV
           MD5=$(curl https://scan.coverity.com/download/$COVERITY_LANGUAGE/$COVERITY_PLATFORM \
                    --fail \
                    --form token='${{ secrets.COVERITY_SCAN_TOKEN }}' \
@@ -99,6 +107,16 @@ jobs:
             mkdir $RUNNER_TEMP/cov-analysis &&
             tar -xzf $RUNNER_TEMP/$COVERITY_TOOL_FILENAME --strip 1 -C $RUNNER_TEMP/cov-analysis
             ;;
+          *.dmg)
+            cd $RUNNER_TEMP &&
+            attach="$(hdiutil attach $COVERITY_TOOL_FILENAME)" &&
+            volume="$(echo "$attach" | cut -f 3 | grep /Volumes/)" &&
+            mkdir cov-analysis &&
+            cd cov-analysis &&
+            sh "$volume"/cov-analysis-macosx-*.sh &&
+            ls -l &&
+            hdiutil detach "$volume"
+            ;;
           *.zip)
             cd $RUNNER_TEMP &&
             mkdir cov-analysis-tmp &&
@@ -120,7 +138,7 @@ jobs:
         run: |
           export PATH="$RUNNER_TEMP/cov-analysis/bin:$PATH" &&
           cov-configure --gcc &&
-          cov-build --dir cov-int make -j$(nproc)
+          cov-build --dir cov-int make
       - name: package the build
         run: tar -czvf cov-int.tgz cov-int
       - name: submit the build to Coverity Scan