Auto merge of #39055 - aidanhs:aphs-deinit-before-init, r=alexcrichton

If submodule init fails, try from scratch

See #39051

I wonder if the cause could be some strange not-quite-checked-out state in a submodule. Try and fix this by force deinitialising everything before initialising (this will not throw away downloaded objects, git will skip them on the next attempt at cloning).

r? @alexcrichton

.travis.yml

@@ -86,10 +86,10 @@ script:
       if [ "$ALLOW_PR" = "" ] && [ "$TRAVIS_BRANCH" != "auto" ]; then
           echo skipping, not a full build;
       elif [ "$TRAVIS_OS_NAME" = "osx" ]; then
-          travis_retry git submodule update --init &&
+          travis_retry sh -c 'git submodule deinit -f . && git submodule update --init' &&
           src/ci/run.sh;
       else
-          travis_retry git submodule update --init &&
+          travis_retry sh -c 'git submodule deinit -f . && git submodule update --init' &&
           src/ci/docker/run.sh $IMAGE;
       fi