fix(coreos-base/oem-gce): Replace curl's --retry with block_until_url

Curl will not retry after most errors, just connection timeouts and some
HTTP errors. In our case the most likely error is network unreachable.
Instead use our simple-minded but trusty block_until_url script to wait.

sdk_container/src/third_party/coreos-overlay/coreos-base/oem-gce/files/gce-coreos-cloudinit

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-URL_PREFIX="http://169.254.169.254/computeMetadata/v1/"
+METADATA_URL="http://169.254.169.254/computeMetadata/"
 TMPFILE=$(mktemp /tmp/XXXXXX-cloud-init)
 if [[ $? -ne 0 || ! -f "${TMPFILE}" ]]; then
 	echo "Failed to create temp file for user-data" >&2
@@ -10,11 +10,12 @@ trap "rm -f '${TMPFILE}'" EXIT
 
 try_cloudinit() {
     local id="$1"
-    local url="${URL_PREFIX}${id}/attributes/user-data"
+    local url="${METADATA_URL}v1/${id}/attributes/user-data"
 
     echo "Trying to fetch $id user-data..."
-    curl --retry 5 --retry-delay 2 --silent --fail --show-error \
-        -H "X-Google-Metadata-Request: True" -o "${TMPFILE}" "${url}"
+    curl --fail --silent --show-error \
+        -H "X-Google-Metadata-Request: True" \
+        -o "${TMPFILE}" "${url}"
 
     ret=$?
     if [[ $ret -ne 0 && $ret -ne 22 ]]; then
@@ -29,4 +30,5 @@ try_cloudinit() {
     return $?
 }
 
+block-until-url "${METADATA_URL}"
 try_cloudinit project && try_cloudinit instance

sdk_container/src/third_party/coreos-overlay/coreos-base/oem-gce/files/gce-setup-environment

@@ -1,6 +1,7 @@
 #!/bin/bash -e
 
 ENV=$1
+METADATA_URL="http://169.254.169.254/computeMetadata/"
 
 if [ -z "$ENV" ]; then
         echo usage: $0 /etc/environment
@@ -14,18 +15,19 @@ if [ $? -ne 0 ]; then
         exit 1
 fi
 
+get_value() {
+    curl --fail --silent --show-error \
+        -H "X-Google-Metadata-Request: True" \
+        "${METADATA_URL}v1/instance/$1"
+}
+
+block-until-url "${METADATA_URL}"
+external_ip=$(get_value network-interfaces/0/access-configs/0/external-ip)
+public_ip=$(get_value network-interfaces/0/ip)
+
 sed -i -e '/^COREOS_PUBLIC_IPV4=/d' \
     -e '/^COREOS_PRIVATE_IPV4=/d' \
     "${ENV}"
 
-external_ip=$(curl --retry 5 --retry-delay 2 --silent --fail \
-		"http://169.254.169.254/computeMetadata/v1/instance/network-interfaces/0/access-configs/0/external-ip" \
-		-H "X-Google-Metadata-Request: True")
-
-
-public_ip=$(curl --retry 5 --retry-delay 2 --silent --fail \
-		"http://169.254.169.254/computeMetadata/v1/instance/network-interfaces/0/ip" \
-		-H "X-Google-Metadata-Request: True")
-
 echo COREOS_PUBLIC_IPV4=${external_ip} >> $ENV
 echo COREOS_PRIVATE_IPV4=${public_ip} >> $ENV