From d2ed580372817c5907e192847eb2e27e78975f71 Mon Sep 17 00:00:00 2001
From: Greg Miller <9447643+devjgm@users.noreply.github.com>
Date: Sat, 5 Jun 2021 08:28:24 -0400
Subject: [PATCH] fix(cmake-oldest-deps): use vcpkg release tarball rather than
 clone

Fixes: https://github.com/googleapis/google-cloud-cpp/issues/6699

This PR changes the `cmake-oldest-deps` build to use a release tarball
of vcpkg, the same as our other builds that use vcpkg, instead of
cloning the whole vcpkg repo, which picks up new changes from vcpkg that
can break our build unexpectedly.

This change appears to work in my local tests, but I'm concerned that
it's wrong because the previous code had a comment saying that cloning
the repo was required. So I suppose this PR is just for discussion to
see if this is the right direction or if we should fix the issue some
other way.
---
 ci/cloudbuild/builds/cmake-oldest-deps.sh | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/ci/cloudbuild/builds/cmake-oldest-deps.sh b/ci/cloudbuild/builds/cmake-oldest-deps.sh
index 60c73a448cdcc..dcb93e3515539 100755
--- a/ci/cloudbuild/builds/cmake-oldest-deps.sh
+++ b/ci/cloudbuild/builds/cmake-oldest-deps.sh
@@ -23,18 +23,13 @@ source module ci/cloudbuild/builds/lib/integration.sh
 export CC=clang
 export CXX=clang++
 
+io::log_h2 "Installing vcpkg"
 vcpkg_root="${PROJECT_ROOT}/cmake-out/vcpkg"
-if [[ ! -d "${vcpkg_root}" ]]; then
-  mkdir -p "${vcpkg_root}"
-  # To enable versioning we need to clone the vcpkg history. It seems that
-  # vcpkg uses `git` to find out what was the state of their packages at a
-  # given "baseline" (totally reasonable, otherwise they would need to
-  # implement another version control system).
-  git clone https://github.com/microsoft/vcpkg.git "${vcpkg_root}"
-fi
-
-io::log_h2 "Bootstrapping vcpkg"
-env CC="ccache ${CC}" CXX="ccache ${CXX}" "${vcpkg_root}"/bootstrap-vcpkg.sh
+mkdir -p "${vcpkg_root}"
+io::log "Downloading vcpkg into ${vcpkg_root}..."
+curl -sSL "https://github.com/microsoft/vcpkg/archive/2021.05.12.tar.gz" |
+  tar -C "${vcpkg_root}" --strip-components=1 -zxf -
+env -C "${vcpkg_root}" CC="ccache ${CC}" CXX="ccache ${CXX}" ./bootstrap-vcpkg.sh
 
 io::log_h2 "Configuring"
 cmake -GNinja -S . -B cmake-out/build \