Fixes for update-vendor.sh on OSX and zsh

The update-vendor.sh script needed some fixes to work with zsh on OSX.

Various binaries are expected to be GNU utils, which are not installed
by default on OSX. I've added suggestions to install ported binaries
using homebrew if they are not found in PATH.

Skip `shopt -s lastpipe` when `$BASH` is not defined.

Author: Mario Valderrama

cluster-autoscaler/hack/update-vendor.sh

@@ -3,7 +3,36 @@
 set -o errexit
 set -o pipefail
 set -o nounset
-shopt -s lastpipe
+if [[ -n "${BASH}" ]]; then
+  shopt -s lastpipe
+fi
+
+SED=sed
+GREP=grep
+XARGS=xargs
+GETOPT=getopt
+if [[ "$(uname)" == "Darwin" ]]; then
+  SED=gsed
+  GREP=ggrep
+  XARGS=gxargs
+  GETOPT="$(brew --prefix gnu-getopt)/bin/getopt"
+  command -v $SED >/dev/null || {
+    echo "$SED not installed. Try: brew install gnu-sed" >&2;
+    exit 1;
+  }
+  command -v $XARGS >/dev/null || {
+    echo "$XARGS not installed. Try: brew install findutils" >&2;
+    exit 1;
+  }
+  command -v $GETOPT >/dev/null || {
+    echo "$GETOPT not installed. Try: brew install gnu-getopt" >&2;
+    exit 1;
+  }
+  command -v $GREP >/dev/null || {
+    echo "$GREP not installed. Try: brew install grep" >&2;
+    exit 1;
+  }
+fi
 
 if [[ $(basename $(pwd)) != "cluster-autoscaler" ]];then
   echo "The script must be run in cluster-autoscaler directory"
@@ -109,8 +138,8 @@ set +o errexit
   cp $K8S_REPO/go.mod .
 
   # Check go version
-  REQUIRED_GO_VERSION=$(cat go.mod  |grep '^go ' |tr -s ' ' |cut -d ' '  -f 2)
-  USED_GO_VERSION=$(go version |sed 's/.*go\([0-9]\+\.[0-9]\+\).*/\1/')
+  REQUIRED_GO_VERSION=$(cat go.mod | $GREP '^go ' |tr -s ' ' |cut -d ' '  -f 2)
+  USED_GO_VERSION=$(go version | $SED 's/.*go\([0-9]\+\.[0-9]\+\).*/\1/')
 
 
   if [[ "${REQUIRED_GO_VERSION}" != "${USED_GO_VERSION}" ]];then
@@ -122,8 +151,8 @@ set +o errexit
   fi
 
   # Fix module name and staging modules links
-  sed -i "s#module k8s.io/kubernetes#module ${TARGET_MODULE}#" go.mod
-  sed -i "s#\\./staging#${K8S_REPO}/staging#" go.mod
+  $SED -i "s#module k8s.io/kubernetes#module ${TARGET_MODULE}#" go.mod
+  $SED -i "s#\\./staging#${K8S_REPO}/staging#" go.mod
 
   function list_dependencies() {
     local_tmp_dir=$(mktemp -d "${WORK_DIR}/list_dependencies.XXXX")
@@ -160,10 +189,10 @@ set +o errexit
   # Add dependencies from go.mod-extra to go.mod
   # Propagate require entries to both require and replace
   for go_mod_extra in ${GO_MOD_EXTRA_FILES}; do
-    go mod edit -json ${go_mod_extra} | jq -r '.Require[]? | "-require \(.Path)@\(.Version)"' | xargs -t -r go mod edit >&${BASH_XTRACEFD} 2>&1
-    go mod edit -json ${go_mod_extra} | jq -r '.Require[]? | "-replace \(.Path)=\(.Path)@\(.Version)"' | xargs -t -r go mod edit >&${BASH_XTRACEFD} 2>&1
+    go mod edit -json ${go_mod_extra} | jq -r '.Require[]? | "-require \(.Path)@\(.Version)"' | $XARGS -t -r go mod edit >&${BASH_XTRACEFD} 2>&1
+    go mod edit -json ${go_mod_extra} | jq -r '.Require[]? | "-replace \(.Path)=\(.Path)@\(.Version)"' | $XARGS -t -r go mod edit >&${BASH_XTRACEFD} 2>&1
     # And add explicit replace entries
-    go mod edit -json ${go_mod_extra} | jq -r '.Replace[]? | "-replace \(.Old.Path)=\(.New.Path)@\(.New.Version)"' | sed "s/@null//g" |xargs -t -r go mod edit >&${BASH_XTRACEFD} 2>&1
+    go mod edit -json ${go_mod_extra} | jq -r '.Replace[]? | "-replace \(.Old.Path)=\(.New.Path)@\(.New.Version)"' | $SED "s/@null//g" | $XARGS -t -r go mod edit >&${BASH_XTRACEFD} 2>&1
   done
   # Add k8s.io/kubernetes dependency
   go mod edit -require k8s.io/[email protected]
@@ -176,7 +205,7 @@ set +o errexit
 
   IMPLICIT_FOUND="false"
   set +o pipefail
-  diff -u ${WORK_DIR}/packages-before-tidy ${WORK_DIR}/packages-after-tidy | grep -v '\+\+\+ ' | grep '^\+' | cut -b 2- |while read line; do
+  diff -u ${WORK_DIR}/packages-before-tidy ${WORK_DIR}/packages-after-tidy | $GREP -v '\+\+\+ ' | $GREP '^\+' | cut -b 2- |while read line; do
     IMPLICIT_FOUND="true"
     echo "Implicit dependency found: ${line}"
   done