avoid "write_in_full(fd, buf, len) != len" pattern

diff --git a/ci/run-windows-build.sh b/ci/run-windows-build.sh
index d8f0d92f2802bc500e0444d65bf0d57da3adffaf..2d98f6b2f94b12aafbebcd440b3809bf48c2aca6 100755 (executable)
--- a/ci/run-windows-build.sh
+++ b/ci/run-windows-build.sh
@@ -14,14 +14,33 @@ COMMIT=$2
 
 gfwci () {
        local CURL_ERROR_CODE HTTP_CODE
-       exec 3>&1
+       CONTENT_FILE=$(mktemp -t "git-windows-ci-XXXXXX")
+       while test -z $HTTP_CODE
+       do
        HTTP_CODE=$(curl \
                -H "Authentication: Bearer $GFW_CI_TOKEN" \
                --silent --retry 5 --write-out '%{HTTP_CODE}' \
-               --output >(sed "$(printf '1s/^\xef\xbb\xbf//')" >cat >&3) \
+               --output >(sed "$(printf '1s/^\xef\xbb\xbf//')" >$CONTENT_FILE) \
                "https://git-for-windows-ci.azurewebsites.net/api/TestNow?$1" \
        )
        CURL_ERROR_CODE=$?
+               # The GfW CI web app sometimes returns HTTP errors of
+               # "502 bad gateway" or "503 service unavailable".
+               # We also need to check the HTTP content because the GfW web
+               # app seems to pass through (error) results from other Azure
+               # calls with HTTP code 200.
+               # Wait a little and retry if we detect this error. More info:
+               # https://docs.microsoft.com/en-in/azure/app-service-web/app-service-web-troubleshoot-http-502-http-503
+               if test $HTTP_CODE -eq 502 ||
+                  test $HTTP_CODE -eq 503 ||
+                  grep "502 - Web server received an invalid response" $CONTENT_FILE >/dev/null
+               then
+                       sleep 10
+                       HTTP_CODE=
+               fi
+       done
+       cat $CONTENT_FILE
+       rm $CONTENT_FILE
        if test $CURL_ERROR_CODE -ne 0
        then
                return $CURL_ERROR_CODE
@@ -61,7 +80,8 @@ do
        case "$STATUS" in
        inProgress|postponed|notStarted) sleep 10               ;; # continue
                 "completed: succeeded") RESULT="success"; break;; # success
-       *) echo "Unhandled status: $STATUS";               break;; # failure
+                   "completed: failed")                   break;; # failure
+       *) echo "Unhandled status: $STATUS";               break;; # unknown
        esac
 done