improve script readability

demos/integration_tests.sh

@@ -30,32 +30,37 @@
 # At time of writing, its 'call point' was in
 # https://github.com/kubernetes/test-infra/blob/master/jobs/config.json
 
-function exit_with {
+function exitWith {
   local msg=$1
   echo >&2 ${msg}
   exit 1
 }
-export -f exit_with
+export -f exitWith
 
-repo=kubernetes-sigs/kustomize
-if [[ `pwd` != */$repo ]]; then
-  exit_with "Script must be run from $repo"
-fi
+function expectCommand {
+  command -v $1 >/dev/null 2>&1 || \
+    { exitWith "Expected $1 on PATH."; }
+}
 
-echo    pwd is `pwd`
-echo GOPATH is $GOPATH
-echo   PATH is $PATH
+function setUpEnv {
+  local repo=$(git rev-parse --show-toplevel)
+  cd $repo
+  [[ $? -eq 0 ]] || "Failed to cd to $repo"
+  echo "pwd is " `pwd`
 
-go install . || \
-  { exit_with "Failed to install kustomize."; }
+  local expectedRepo=kubernetes-sigs/kustomize
+  if [[ `pwd` != */$expectedRepo ]]; then
+    exitWith "Script must be run from $expectedRepo"
+  fi
 
-export PATH=$GOPATH/bin:$PATH
+  go install . || \
+    { exitWith "Failed to install kustomize."; }
 
-command -v kustomize >/dev/null 2>&1 || \
-  { exit_with "Require kustomize but it's not installed."; }
+  PATH=$GOPATH/bin:$PATH
 
-command -v kubectl >/dev/null 2>&1 || \
-  { exit_with "Require kubectl but it's not installed."; }
+  expectCommand kustomize
+  expectCommand kubectl
+}
 
 function runTest {
   local script=$1
@@ -63,16 +68,17 @@ function runTest {
   local args=$@
 
   if [ ! -x "$script" ]; then
-    exit_with "Unable to run $script"
+    exitWith "Unable to run $script"
   fi
 
   $script "$args"
-  if [ $? -ne 0 ]; then
-    exit_with "Failed: $script $args"
-  fi
+  [[ $? -eq 0 ]] || exitWith "Failed: $script $args"
+
   echo "$script passed."
 }
 
+setUpEnv
+
 pushd demos
 runTest ldap/integration_test.sh ldap/base
 popd

demos/ldap/integration_test.sh

@@ -30,68 +30,105 @@ set -x
 
 target=$1
 
-echo pwd is `pwd`
-echo Kustomizing \"$target\"
+echo Kustomizing: \"$target\"
 ls $target
-kustomize build $target > generatedResources.yaml
-[[ $? -eq 0 ]] || { exit_with "Failed to kustomize build"; }
 
-cat generatedResources.yaml
+tmpDir=$(mktemp -d)
 
-# Setting the namespace this way is a test-infra thing?
-kubectl config set-context \
-  $(kubectl config current-context) --namespace=default
+function configureCluster {
+  kustomize build $target > $tmpDir/my.yaml
+  [[ $? -eq 0 ]] || { exitWith "Failed to kustomize build"; }
 
-kubectl apply -f generatedResources.yaml
-[[ $? -eq 0 ]] || { exit_with "Failed to run kubectl apply"; }
+  cat $tmpDir/my.yaml
 
-sleep 20
+  # Setting the namespace this way is a test-infra thing?
+  kubectl config set-context \
+    $(kubectl config current-context) --namespace=default
 
-# get the pod and namespace
-pod=$(kubectl get pods -l app=ldap  -o jsonpath='{.items[0].metadata.name}')
-namespace=$(kubectl get pods -l app=ldap  -o jsonpath='{.items[0].metadata.namespace}')
-container="ldap"
-[[ -z ${pod} ]] && { exit_with "Pod is not started successfully"; }
-[[ -z ${namespace} ]] && { exit_with "Couldn't get namespace for Pod ${pod}"; }
+  kubectl apply -f $tmpDir/my.yaml
+  [[ $? -eq 0 ]] || { exitWith "Failed to run kubectl apply"; }
 
-# create a user ldif file locally
-ldiffile="user.ldif"
-cat <<EOF >$ldiffile
+  sleep 20
+}
+
+function tearDownCluster {
+  kubectl delete -f $tmpDir/my.yaml
+  rm -rf $tmpDir
+}
+
+function getPodField {
+  echo $(kubectl get pods -l app=ldap -o jsonpath=$1)
+}
+
+function podExec {
+  kubectl exec $podName -c $containerName -- "$@"
+}
+
+function addUser {
+  local namespace=`getPodField '{.items[0].metadata.namespace}'`
+  [[ -z $namespace ]] && { exitWith "Unable to get namespace"; }
+
+  # Create a user ldif file
+  local userFile="user.ldif"
+  cat <<EOF >$tmpDir/$userFile
 dn: cn=The Postmaster,dc=example,dc=org
 objectClass: organizationalRole
 cn: The Postmaster
 EOF
-[[ -f ${ldiffile} ]] || { exit_with "Failed to create ldif file locally"; }
+  [[ -f $tmpDir/$userFile ]] || { exitWith "Failed to create $tmpDir/$userFile"; }
 
-# add a user
-pod_ldiffile="/tmp/user.ldif"
-kubectl cp $ldiffile  ${namespace}/${pod}:${pod_ldiffile} || \
-  { exit_with "Failed to copy ldif file to Pod ${pod}"; }
+  kubectl cp $tmpDir/$userFile  $namespace/$podName:/tmp/$userFile || \
+    { exitWith "Failed to copy ldif file to Pod $podName"; }
 
-kubectl exec ${pod} -c ${container} -- \
-  ldapadd -x -H ldap://localhost -D "cn=admin,dc=example,dc=org" -w admin \
-  -f ${pod_ldiffile} || { exit_with "Failed to add a user"; }
+  rm $tmpDir/$userFile
 
-# query the added user
-r=$(kubectl exec ${pod} -c ${container} -- \
-  ldapsearch -x -H ldap://localhost -b dc=example,dc=org \
-  -D "cn=admin,dc=example,dc=org" -w admin)
+  podExec \
+    ldapadd \
+    -x \
+    -w admin \
+    -H ldap://localhost \
+    -D "cn=admin,dc=example,dc=org" \
+    -f /tmp/$userFile
+}
 
-user_count=$(echo ${r} | grep "cn: The Postmaster" | wc -l)
-[[ ${user_count} -eq 0 ]] && { exit_with "Couldn't find the new added user"; }
+function getUserCount {
+  local result=$(\
+    podExec \
+      ldapsearch \
+      -x \
+      -w admin \
+      -H ldap://localhost \
+      -D "cn=admin,dc=example,dc=org" \
+      -b dc=example,dc=org \
+      )
+  return $(echo $result | grep "cn: The Postmaster" | wc -l)
+}
 
-# delete the added user
-kubectl exec ${pod} -c ${container} -- \
-  ldapdelete -v -x -H ldap://localhost "cn=The Postmaster,dc=example,dc=org" \
-  -D "cn=admin,dc=example,dc=org" -w admin || \
-  {  exit_with "Failed to delete the user"; }
+function deleteAddedUser {
+  podExec \
+    ldapdelete \
+    -v \
+    -x \
+    -w admin \
+    -H ldap://localhost \
+    -D "cn=admin,dc=example,dc=org" \
+    "cn=The Postmaster,dc=example,dc=org"
+}
 
-r=$(kubectl exec ${pod} -c ${container} -- \
-  ldapsearch -x -H ldap://localhost -b dc=example,dc=org \
-  -D "cn=admin,dc=example,dc=org" -w admin)
-user_count=$(echo ${r} | grep "cn: The Postmaster" | wc -l)
-[[ ${user_count} -ne 0 ]] && { exit_with "The user hasn't been deleted."; }
+configureCluster
 
-# kubectl delete
-kubectl delete -f generatedResources.yaml
-rm $ldiffile
+podName=`getPodField '{.items[0].metadata.name}'`
+[[ -z $podName ]] && { exitWith "Unable to get pod name"; }
+
+echo pod is $podName
+containerName="ldap"
+
+getUserCount; [[ $? -eq 0 ]] || { exitWith "Expected no users."; }
+
+addUser || { exitWith "Failed to add a user"; }
+getUserCount; [[ $? -eq 1 ]] || { exitWith "Couldn't find the new added user"; }
+
+deleteAddedUser || { exitWith "Failed to delete the user"; }
+getUserCount; [[ $? -eq 0 ]] || { exitWith "User has not been deleted."; }
+
+tearDownCluster