scripts/tests/testversions: enable concurrent installation for each

version

The test-versions test currently takes 1h 40min to run each time. By
running each installation concurrently, hopefully, it will reduce the execution
time for the whole test.

Change-Id: I680c7d9945e982894b11825c9075c167f754e087

scripts/tests/testversions/test-sim-versions.sh

@@ -165,9 +165,22 @@ fi
 
 echo "Setting up environments for versions" ${unique_versions}
 
+# create a result file for each child process' exit code
+exit_statuses_dir=${TMP}/exit_statuses
+mkdir ${exit_statuses_dir}
+write_exit_status(){
+    # we need to capture the exit status first so it won't be overwritten
+    local exit_status=$?
+    local version=$1
+    echo $exit_status > ${exit_statuses_dir}/${version} # write exit code to a file named with the current installing version
+    echo "installation for ${version} exited"
+}
 # clean up git worktree
 git worktree prune
 for version in ${unique_versions}; do
+    # run in parallel
+    (
+        trap "write_exit_status ${version}" EXIT
         dir=$(version_dir ${version})
         bin_dir=${dir}/bin
 
@@ -216,8 +229,14 @@ for version in ${unique_versions}; do
             echo "Binary shasums:"
             shasum ${bin_dir}/uplink
         fi
+    ) &
 done
 
+wait # wait for all child processes to finish
+# iterate through those result files to check their exit code
+# if there's any exit code that's non-zero, exit the test
+grep -qvwr "0" ${exit_statuses_dir} && exit 1
+
 # Use stage 1 satellite version as the starting state. Create a cp of that
 # version folder so we don't worry about dirty states. Then copy/link/mv
 # appropriate resources into that folder to ensure we have correct versions.