[devops] Attempt to fix simulator runtimes disappearing. (#20559)

Attempt to fix simulator runtimes disappearing by:

* Detaching all the currently loaded runtimes.
* Killing the simdiskimaged and CoreSimulatorService services.

Hopefully this will make the simdiskimaged service restart, and reload the
simulator runtimes.

tools/devops/automation/scripts/bash/clean-simulator-runtime.sh

@@ -8,17 +8,21 @@ IFS=$'\n\t'
 xcrun simctl runtime list -j > simruntime.json
 cat simruntime.json
 
-grep -e '"identifier" : ' -e '"runtimeIdentifier" : ' simruntime.json | tr '\n' ' ' | sed -e 's/,//g' -e 's/"//g' -e 's/runtimeIdentifier : //g' -e $'s/identifier : /@/g' | tr '@' '\n' | awk NF | sed 's/^[[:blank:]]*//' > simruntime-lines.txt
-cat simruntime-lines.txt
+if grep -e '"identifier" : ' -e '"runtimeIdentifier" : ' simruntime.json | tr '\n' ' ' | sed -e 's/,//g' -e 's/"//g' -e 's/runtimeIdentifier : //g' -e $'s/identifier : /@/g' | tr '@' '\n' | awk NF | sed 's/^[[:blank:]]*//' > simruntime-lines.txt; then
+  cat simruntime-lines.txt
+fi
 
-sed -e 's/.*com.apple/com.apple/g' simruntime-lines.txt > simruntime-runtimes.txt
-cat simruntime-runtimes.txt
+if sed -e 's/.*com.apple/com.apple/g' simruntime-lines.txt > simruntime-runtimes.txt; then
+  cat simruntime-runtimes.txt
+fi
 
-sort simruntime-runtimes.txt | uniq -c | sort -n | sed 's/^[[:blank:]]*//' > simruntime-runtimes-by-count.txt
-cat simruntime-runtimes-by-count.txt
+if sort simruntime-runtimes.txt | uniq -c | sort -n | sed 's/^[[:blank:]]*//' > simruntime-runtimes-by-count.txt; then
+  cat simruntime-runtimes-by-count.txt
+fi
 
-grep -v '^1 ' simruntime-runtimes-by-count.txt | sed 's/^[0-9 ]*//' > simruntime-duplicated-runtimes.txt
-cat simruntime-duplicated-runtimes.txt
+if grep -v '^1 ' simruntime-runtimes-by-count.txt | sed 's/^[0-9 ]*//' > simruntime-duplicated-runtimes.txt; then
+  cat simruntime-duplicated-runtimes.txt
+fi
 
 while IFS= read -r simruntime
 do
@@ -32,7 +36,20 @@ do
       echo "    deleted runtime $id"
     fi
   done
-done < simruntime-duplicated-runtimes.txt
-
-xcrun simctl runtime list -v
-xcrun simctl runtime match list -v
+done < simruntime-duplicated-runtimes.txt || true
+
+xcrun simctl runtime list -v || true
+xcrun simctl runtime match list -v || true
+
+# try to detach all simulator runtimes
+for dir in /Library/Developer/CoreSimulator/Volumes/*; do
+  sudo diskutil eject "$dir" || true
+done
+# kill the com.apple.CoreSimulator.simdiskimaged service
+sudo launchctl kill 9 system/com.apple.CoreSimulator.simdiskimaged || true
+# kill the com.apple.CoreSimulator.CoreSimulatorService service
+# it seems this service starts the simdiskimaged service if it's not running.
+sudo pkill -9 com.apple.CoreSimulator.CoreSimulatorService || true
+# the disk image service should now restart when needed, and reload the re-attach all the simulator runtimes.
+
+xcrun simctl runtime match list -v || true