From d3d893cb4a3e597f6b406558a2839a7d1784aa6a Mon Sep 17 00:00:00 2001
From: jroddev <jroddev@gmail.com>
Date: Sun, 13 Feb 2022 17:07:14 +1100
Subject: [PATCH] g++ install is failing because + is treated as a regex
 control character

---
 pre_cache_action.sh | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/pre_cache_action.sh b/pre_cache_action.sh
index 51a5b78..8cab7a7 100755
--- a/pre_cache_action.sh
+++ b/pre_cache_action.sh
@@ -15,12 +15,12 @@ mkdir -p $cache_dir
 echo -n "Validating action arguments (version='$version', packages='$packages')...";
 echo $version | grep -o " " > /dev/null
 if [ $? -eq 0 ]; then
-  echo "aborted." 
+  echo "aborted."
   echo "Version value '$version' cannot contain spaces." >&2
   exit 1
 fi
 if [ "$packages" == "" ]; then
-  echo "aborted." 
+  echo "aborted."
   echo "Packages argument cannot be empty." >&2
   exit 2
 fi
@@ -28,7 +28,8 @@ echo "done."
 
 echo -n "Verifying packages..."
 for package in $packages; do
-  apt-cache search ^$package$ | grep $package > /dev/null
+  escaped=$(echo $package | sed 's/+/\\+/g')
+  apt-cache search ^$escaped$ | grep $package > /dev/null
   if [ $? -ne 0 ]; then
     echo "aborted."
     echo "Package '$package' not found." >&2