bazel: pin to 0.26.1 (#105)

Signed-off-by: Jose Nino jnino@lyft.com

Description: pin our bazel install to 0.26.1. There are a few items that do not work yet on 0.27.0, and we want to have a controlled upgrade.
Risk Level: low -- pins the bazel version for ease of compatibility
Testing: CI

Signed-off-by: JP Simard <jp@jpsim.com>

mobile/azure-pipelines.yml

@@ -36,7 +36,7 @@ jobs:
     steps:
       - checkout: self
         submodules: true
-      - script: ./envoy/ci/mac_ci_setup.sh
+      - script: ./ci/mac_ci_setup.sh
         displayName: 'Install dependencies'
       - script: bazel build --config=ios //:ios_dist
         displayName: 'Build Envoy.framework distributable'
@@ -53,7 +53,7 @@ jobs:
     steps:
       - checkout: self
         submodules: true
-      - script: ./envoy/ci/mac_ci_setup.sh
+      - script: ./ci/mac_ci_setup.sh
         displayName: 'Install dependencies'
       - script: mkdir -p dist/Envoy.framework
         displayName: 'Create directory for distributable'
@@ -72,7 +72,7 @@ jobs:
     steps:
       - checkout: self
         submodules: true
-      - script: ./envoy/ci/mac_ci_setup.sh
+      - script: ./ci/mac_ci_setup.sh
         displayName: 'Install dependencies'
       - script: mkdir -p dist/Envoy.framework
         displayName: 'Create directory for distributable'

mobile/ci/mac_ci_setup.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Installs the dependencies required for a macOS build.
+
+function is_installed {
+    brew ls --versions "$1" >/dev/null
+}
+
+function install {
+    echo "Installing $1"
+    if ! brew install "$1"
+    then
+        echo "Failed to install $1"
+        exit 1
+    fi
+}
+
+if ! brew update; then
+    echo "Failed to update homebrew"
+    exit 1
+fi
+
+DEPS="automake cmake coreutils go libtool wget ninja"
+for DEP in ${DEPS}
+do
+    is_installed "${DEP}" || install "${DEP}"
+done
+
+# Install bazel manually until https://github.com/bazelbuild/continuous-integration/issues/128 is fixed.
+# Otherwise we always pull the latest release automatically.
+wget -c https://github.com/bazelbuild/bazel/releases/download/0.26.1/bazel-0.26.1-installer-darwin-x86_64.sh
+chmod +x bazel-0.26.1-installer-darwin-x86_64.sh
+sudo ./bazel-0.26.1-installer-darwin-x86_64.sh
+bazel version