wip: updated migration script to run migration commands

terraform-google-modules · Oct 4, 2019 · ff8f440 · ff8f440
1 parent a2aed75
commit ff8f440
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Showing 2 changed files with 41 additions and 8 deletions.
diff --git a/docs/upgrading_to_v2.0.md b/docs/upgrading_to_v2.0.md
@@ -93,7 +93,7 @@ can't guarantee that exactly these actions will be performed if
 
 ### Manual Migration Steps
 
-In this example here are the two commands used migrate the subnets created by the `simple_project` in the examples directory.  _please note the need to escape the quotes on the new resource_.
+In this example here are the two commands used migrate the subnets created by the `simple_project` in the examples directory.  _please note the need to escape the quotes on the new resource_. You may also use the migration script.
 
 -   `terraform state mv module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[0] module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[\"us-west1/simple-project-timh-subnet-01\"]`
 
@@ -132,18 +132,17 @@ actions need to be performed.
 2.  Run the script to output the migration commands:
 
     ```sh
-    $ MODULE_NAME="test-vpc-module" ./migrate.sh
+    $ MODULE_NAME="test-vpc-module" ./migrate.sh --dry-run
     terraform state mv module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[0] module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[\"us-west1/simple-project-timh-subnet-01\"]
     terraform state mv module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[1] module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[\"us-west1/simple-project-timh-subnet-02\"]
     ```
 
 3.  Execute the migration command
 
     ```sh
-    $ terraform state mv module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[0] module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[\"us-west1/simple-project-timh-subnet-01\"]
+    $ MODULE_NAME="test-vpc-module" ./migrate.sh
     Move "module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[0]" to "module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[\"us-west1/simple-project-timh-subnet-01\"]"
     Successfully moved 1 object(s).
-    $ terraform state mv module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[1] module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[\"us-west1/simple-project-timh-subnet-02\"]
     Move "module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[1]" to "module.example.module.test-vpc-module.google_compute_subnetwork.subnetwork[\"us-west1/simple-project-timh-subnet-02\"]"
     Successfully moved 1 object(s).
     ```

diff --git a/scripts/migrate.sh b/scripts/migrate.sh
@@ -16,12 +16,46 @@
 # Output Terraform Commands to migrate to new subnet config
 set -e
 set -o pipefail
+CMD="terraform state"
+
+while (( "$#" )); do
+  # shellcheck disable=SC2221,SC2222
+  case "$1" in
+    -d|--dry-run)
+      DRY_RUN=true
+      shift 1
+      ;;
+    --) # end argument parsing
+      shift
+      break
+      ;;
+    -*|--*=) # unsupported flags
+      echo "Error: Unsupported flag $1" >&2
+      exit 1
+      ;;
+    *) # preserve positional arguments
+      PARAMS="$PARAMS $1"
+      shift
+      ;;
+  esac
+done
+
+eval set -- "$PARAMS"
+
+if [ ! -e "$(command -v terraform)" ]; then
+  echo "can not find terraform"
+  exit 1
+fi
 
 if [[ "$MODULE_NAME" ]]; then
-  NAME=$(terraform state list | grep "${MODULE_NAME}".google_compute_network.network  | sed 's/.google_compute_network.network//')
-  for x in $(terraform state list | grep "${NAME}".google_compute_subnetwork.subnetwork); do
-    ID=$(terraform state show "$x" | grep id | grep -v ip_cidr_range | awk '{ print $3 }'| tr -d '"')
-    echo "terraform state mv $x ${NAME}.google_compute_subnetwork.subnetwork[\\\"${ID}\\\"]"
+  NAME=$(${CMD} list | grep "${MODULE_NAME}".google_compute_network.network  | sed 's/.google_compute_network.network//')
+  for x in $($CMD list | grep "${NAME}".google_compute_subnetwork.subnetwork); do
+    ID=$(${CMD} show "$x" | grep id | grep -v ip_cidr_range | awk '{ print $3 }'| tr -d '"')
+    if [[ $DRY_RUN ]]; then
+      echo "${CMD} mv $x ${NAME}.google_compute_subnetwork.subnetwork[\\\"${ID}\\\"]"
+    else
+      ${CMD} mv "$x" "${NAME}".google_compute_subnetwork.subnetwork[\""${ID}"\"]
+    fi
   done
 else
   echo "MISSING MODULE_NAME: MODULE_NAME env var is required"