Do merge sha work for Azure as it runs detached head

SHA1SUM

@@ -1 +1 @@
-a0a6a995c0344a91f842d706be0ce382198f9c3e  codecov
+48ad4d9f3dfd0dd194804c8b7207f03cdcc7e94f  codecov

SHA256SUM

@@ -1 +1 @@
-6b3a7a4dc3ba8bdaa12b1341cddc310b780d5e9eb1ef51d240c8ada352a763fa  codecov
+4792a0946df31cd69770156f3172f9ca1c3c318c5c9ab8bb5846eed2987cf77e  codecov

SHA512SUM

@@ -1 +1 @@
-08c2e1854c0c45fcfcfb8923c5b2799d8cf252f0b75e590dbac1a70506a93688ee1b4dc4c96846575224c58b1e362d0ebb1bcebf163c38cb93bd65484ae9b3bc  codecov
+f665ab465163bbc54a86b1e46b7cdbdaaba31044f09570ed74891666e53a810fb732dbaaca3c414609f30be6c284a1d9ec017def43ea171b550d3c3eeb3d2c41  codecov

codecov

@@ -846,8 +846,9 @@ then
   fi
   if [[ "$mc" =~ ^[a-z0-9]{40}[[:space:]][a-z0-9]{40}$ ]];
   then
-    say "    Fixing merge commit SHA"
-    commit=$(echo "$mc" | cut -d' ' -f2)
+    mc=$(echo "$mc" | cut -d' ' -f2)
+    say "    Fixing merge commit SHA $commit -> $mc"
+    commit=$mc
   fi
 
 elif [ "$SYSTEM_TEAMFOUNDATIONSERVERURI" != "" ];
@@ -870,6 +871,19 @@ then
   branch="${BUILD_SOURCEBRANCH#"refs/heads/"}"
   build_url=$(urlencode "${SYSTEM_TEAMFOUNDATIONSERVERURI}${SYSTEM_TEAMPROJECT}/_build/results?buildId=${BUILD_BUILDID}")
 
+  # azure/pipelines runs in detached HEAD
+  mc=
+  if [ -n "$pr" ] && [ "$pr" != false ];
+  then
+    mc=$(git show --no-patch --format="%P" 2>/dev/null || echo "")
+  fi
+  if [[ "$mc" =~ ^[a-z0-9]{40}[[:space:]][a-z0-9]{40}$ ]];
+  then
+    mc=$(echo "$mc" | cut -d' ' -f2)
+    say "    Fixing merge commit SHA $commit -> $mc"
+    commit=$mc
+  fi
+
 elif [ "$CI" = "true" ] && [ "$BITBUCKET_BUILD_NUMBER" != "" ];
 then
   say "$e==>$x Bitbucket detected."