Update update_dep.sh

Based on the experience of performing dependency bumps, some minor
improvements are made to the script to make it conform to our current
dependency bump procedure, listed as follows:
- print out the dependency's version before and after the bump
- introduce a new argument: should force upgrade when the dependency is
purely indirect (see use case: etcd-io#18596 (comment))
- check if the dependency is fully indirect
- check if all dependencies across all go mod files have the same pinned
version respectively after bumping a dependency

Signed-off-by: Chun-Hung Tseng <[email protected]>

scripts/update_dep.sh

@@ -1,33 +1,65 @@
 #!/bin/bash 
 
 # Usage:
-#    ./scripts/update_dep.sh module version
-# or ./scripts/update_dep.sh module
+#    ./scripts/update_dep.sh should_force_upgrade module version
+# or ./scripts/update_dep.sh should_force_upgrade module
 # e.g.
-#   ./scripts/update_dep.sh github.com/golang/groupcache
-#   ./scripts/update_dep.sh github.com/soheilhy/cmux v0.1.5
+#   ./scripts/update_dep.sh false github.com/golang/groupcache
+#   ./scripts/update_dep.sh false github.com/soheilhy/cmux v0.1.5
 #
 # Updates version of given dependency in all the modules that depend on the mod.
 
 set -euo pipefail
 
 source ./scripts/test_lib.sh
 
-mod="$1"
-ver="$2"
+if [ "$#" -ne 3 ]; then
+    echo "Illegal number of parameters"
+    exit 1
+fi
 
-function maybe_update_module {
+should_force_upgrade="$1"
+mod="$2"
+ver="$3"
+
+function print_current_dep_version {
+  echo "${mod} version in all go mod files"
+  grep --exclude-dir=.git --include=\*.mod -Ri "${mod}" | grep -v sum
+  printf "\n\n"
+}
+
+function is_fully_indirect {
+  tmp=$(print_current_dep_version)
+
+  # check if all lines end with "// indirect"
+  # if grep found nothing, the error code will be non-zero
+  if grep --exclude-dir=.git --include=\*.mod -Ri -q "^.*${mod} v.*// indirect$"; then 
+      echo "Fully indirect, we will terminate the script"
+      exit 1
+  else
+      echo "Not fully indirect, we will perform dependency bump"
+  fi
+}
+
+function update_module {
   run go mod tidy
 
-  deps=$(go list -f '{{if not .Indirect}}{{if .Version}}{{.Path}},{{.Version}}{{end}}{{end}}' -m all)
+  deps=$(go list -f '{{if .Version}}{{.Path}},{{.Version}}{{end}}' -m all)
   if [[ "$deps" == *"${mod}"* ]]; then
     if [ -z "${ver}" ]; then
       run go get "${mod}"
     else
       run go get "${mod}@${ver}"
     fi
   fi
- }
+}
+
+print_current_dep_version
+if [ "$should_force_upgrade" = false ] ; then
+    is_fully_indirect
+fi
+run_for_modules update_module
+print_current_dep_version
 
-go mod tidy
-run_for_modules maybe_update_module
+# check all dependencies across all go mod files have the same pinned version respectively
+PASSES="dep" ./scripts/test.sh