From 346ebe39519c817a08d94846551cc3fbfd512a09 Mon Sep 17 00:00:00 2001
From: Tony Kelman <tony@kelman.net>
Date: Sun, 14 Dec 2014 04:32:08 -0800
Subject: [PATCH] Fail fast on AppVeyor for repeated commits to same PR

Use AppVeyor's API!

reuse cached version of jq instead of downloading every time

make slightly more robust to network problems
---
 appveyor.yml                  |  1 +
 contrib/windows/msys_build.sh | 18 ++++++++++++++++--
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/appveyor.yml b/appveyor.yml
index a1896b81fec9a..0e3b4b29b096b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -32,6 +32,7 @@ cache:
   - llvm-3.3-i686-w64-mingw32-juliadeps.7z
   - llvm-3.3-x86_64-w64-mingw32-juliadeps.7z
   - make-3.81-2-msys-1.0.11-bin.tar.lzma
+  - jq.exe
 
 build_script:
 # Remove C:\MinGW\bin from the path, the version of MinGW installed on
diff --git a/contrib/windows/msys_build.sh b/contrib/windows/msys_build.sh
index 3d7e9640a715a..c09eff6da21c6 100755
--- a/contrib/windows/msys_build.sh
+++ b/contrib/windows/msys_build.sh
@@ -9,6 +9,22 @@ cd `dirname "$0"`/../..
 # Stop on error
 set -e
 
+# Fail fast on AppVeyor if there are newer pending commits in this PR
+curlflags="curl --retry 10 -k -L -y 5"
+if [ -n "$APPVEYOR_PULL_REQUEST_NUMBER" ]; then
+  # download a handy cli json parser
+  if ! [ -e jq.exe ]; then
+    $curlflags -O http://stedolan.github.io/jq/download/win64/jq.exe
+  fi
+  av_api_url="https://ci.appveyor.com/api/projects/StefanKarpinski/julia/history?recordsNumber=50"
+  query=".builds | map(select(.pullRequestId == \"$APPVEYOR_PULL_REQUEST_NUMBER\"))[0].buildNumber"
+  latestbuild="$(curl $av_api_url | ./jq "$query")"
+  if [ -n "$latestbuild" -a "$latestbuild" != "null" -a "$latestbuild" != "$APPVEYOR_BUILD_NUMBER" ]; then
+    echo "There are newer queued builds for this pull request, failing early."
+    exit 1
+  fi
+fi
+
 # If ARCH environment variable not set, choose based on uname -m
 if [ -z "$ARCH" -a -z "$XC_HOST" ]; then
   export ARCH=`uname -m`
@@ -61,8 +77,6 @@ case $(uname) in
     ;;
 esac
 
-curlflags="curl --retry 10 -k -L -y 5"
-
 # Download most recent Julia binary for dependencies
 if ! [ -e julia-installer.exe ]; then
   f=julia-latest-win$bits.exe