rubocop: install pre-commit hook in plugins

Change-Id: Ica5fdc2ea8306483e8597b9c4ea4f40f92b13c24
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/279017
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
QA-Review: Jeremy Stanley <jeremy@instructure.com>
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>

script/install_hooks

@@ -2,26 +2,39 @@
 set -e
 
 if [ -n "$1" ]; then
-  PREPEND_PATH=$1
+  CANVAS_ROOT=$1
 fi
 
-if [ ! -d $PREPEND_PATH".git" ]; then
+if [ -z "$2" ]; then
+  $0 "$CANVAS_ROOT" $CANVAS_ROOT".git" "."
+  for plugin in $(find $CANVAS_ROOT"gems/plugins" -name .git | sort); do
+    $0 "$CANVAS_ROOT" $plugin "../../.."
+  done
   exit 0
 fi
 
-GLOB_PATTERN=$PREPEND_PATH"hooks/*"
+GIT_DIR=$2
+HOOKS_PREFIX=$3
+
+if [ ! -d "$GIT_DIR" ]; then
+  exit 0
+fi
+
+echo running for git dir $GIT_DIR
+
+GLOB_PATTERN=$CANVAS_ROOT"hooks/*"
 
 for hook in $GLOB_PATTERN; do
   hook_name=${hook##*/}
-  git_path="$PREPEND_PATH"".git/hooks/""$hook_name"
+  git_path="$GIT_DIR/hooks/$hook_name"
   # make sure file exists
   touch "$git_path"
   # make sure it has a shebang prepending if necessary
-  grep -qF -- "#!" "$git_path" || (echo "#!/bin/sh" | cat - $git_path > "$git_path""-temp" && mv "$git_path""-temp" $git_path)
+  grep -qF -- "#!" "$git_path" || (echo "#!/bin/sh" | cat - $git_path > "$git_path-temp" && mv "$git_path-temp" $git_path)
   # make sure it is executable
   [ -x "$git_path" ] || chmod +x "$git_path"
   # # put in line to call this hook
-  grep -qF -- "./hooks/$hook_name" "$git_path" || echo "./hooks/$hook_name" >> "$git_path"
+  grep -qF -- "$HOOKS_PREFIX/hooks/$hook_name" "$git_path" || echo "$HOOKS_PREFIX/hooks/$hook_name" >> "$git_path"
 done
 
 exit 0