Remove broken symlinks when updating deps (#2842)

* remove broken symlinks when updating deps

fix: #2778
Change-Id: Id249c00fa8a506fbbd1d21956b8bfd62c12a9958

* Remove invalid symlinks by running update-deps.sh

* run update-codegen.sh as well
run update-codegen.sh as well
run update-codegen.sh as well
run update-codegen.sh as well
run update-codegen.sh as well
run update-codegen.sh as well
run update-codegen.sh as well
run update-codegen.sh as well
run update-codegen.sh as well

* manually delete vendor/github.com/prometheus/procfs/fixtures/26231/exe

...it is a symlink to /usr/bin/vim ...

* improve on deleting invalid symlinks

* fix typo and minor improvement to make it work on mac/linux

* take reviewer's approach for symlink cleanup

* remove verbose logging msg

* resolve reviewer's comments

hack/update-deps.sh

@@ -20,6 +20,26 @@ set -o pipefail
 
 source $(dirname $0)/../vendor/github.com/knative/test-infra/scripts/library.sh
 
+# Remove symlinks in /vendor that are broken or lead outside the repo.
+function remove_broken_symlinks() {
+  for link in $(find ./vendor -type l); do
+    # Remove broken symlinks
+    if [[ ! -e ${link} ]]; then
+      unlink ${link}
+      continue
+    fi
+    # Get canonical path to target, remove if outside the repo
+    local target="$(ls -l ${link})"
+    target="${target##* -> }"
+    [[ ${target} == /* ]] || target="./${target}"
+    target="$(cd `dirname ${link}` && cd ${target%/*} && echo $PWD/${target##*/})"
+    if [[ ${target} != *github.com/knative/* ]]; then
+      unlink ${link}
+      continue
+    fi
+  done
+}
+
 cd ${REPO_ROOT_DIR}
 
 # Ensure we have everything we need under vendor/
@@ -35,3 +55,6 @@ update_licenses third_party/VENDOR-LICENSE "./cmd/*"
 # cherrypick of #66078.  Remove this once that reaches a client version
 # we have pulled in.
 git apply ${REPO_ROOT_DIR}/hack/66078.patch
+
+# Remove all invalid symlinks under ./vendor
+remove_broken_symlinks