add: script to quickly fetch and compare layers in diffrent regions (#166)

* add: script to quickly fetch and compare layers in diffrent regions

* remove verbose lines

Author: alexgallotta

existing_layers/.gitignore

@@ -0,0 +1 @@
+*.log

existing_layers/all_regions.txt

@@ -0,0 +1,27 @@
+ap-south-2
+ap-south-1
+eu-south-1
+eu-south-2
+me-central-1
+ca-central-1
+eu-central-1
+eu-central-2
+us-west-1
+us-west-2
+af-south-1
+eu-north-1
+eu-west-3
+eu-west-2
+eu-west-1
+ap-northeast-3
+ap-northeast-2
+me-south-1
+ap-northeast-1
+sa-east-1
+ap-east-1
+ap-southeast-1
+ap-southeast-2
+ap-southeast-3
+ap-southeast-4
+us-east-1
+us-east-2

existing_layers/check_existing.sh

@@ -0,0 +1,17 @@
+find_all_regions() {
+  aws-vault exec sso-prod-engineering -- aws ec2 describe-regions | jq -r '.[] | .[] | .RegionName' >all_regions.txt
+}
+
+find_layers_from_all_regions() {
+  while IFS= read -r region; do
+    aws-vault exec sso-prod-engineering -- aws lambda list-layers --region "$region" | grep LayerVersionArn | cut -d':' -f6- >all_layers_"$region".log
+  done <all_regions.txt
+}
+
+diff_from_useast1() {
+  for f1 in all_layers_*.log; do
+    diff --unified=0 "$f1" all_layers_us-east-1.log
+  done | grep -vE "@@|Datadog-Trace-Forwarder-Python|Node8|metric|Node10|Node12|Python27|Python36|Ruby2-5" >all_diff.log # ignore deprecated layers
+}
+
+"$@"