Exit bash when find gets to a folder with permission denied

Question

I'm trying to write a Bash script. Where I go through folders recursively and make a list of and count files and folders.

In a way it works but if "find" gets to a directory where it has permission denied it just continues the script. Skipping the directory not counting files in it nor telling me the directory is permission denied. (other than a useless terminal command which I can't use since the scripts is run through file-manager custom actions)

I would like it to when "find" finds a permission denied folder to stop the searching process and report to me what folder has permission denied. So I know what its skipping and why.

Half my code looks like this

#!/bin/bash

allfolders=("$@")
nfolders="0"

Nfilesinfolders="0"
filesinfolder="0"

results=""
noteadded="0"

for directory in "${allfolders[@]}"; do

    echo "This is where I try and insert the code examples below.
    echo "and want it to exit with a zenity error"

    nfolders=$(( nfolders + 1 ))
    echo "$nfolders"

if [[ $nfolders -ge 11 ]]
    then
      if [[ $noteadded -ge 0 ]]
        then
          results+="\n"
          results+="Not adding any more folders to the list. Look at the top for total number of files"
          noteadded=1
      fi
 else
     results+="$directory\n"
 fi

 echo "This below attempt only worked on the top folder not folders in it"

 if [[ -r "$directory" ]] && [[ -w "$directory" ]]
     then
         filesinfolder=$(find "$directory" -depth -type f -printf '.' | wc -c)
         Nfilesinfolders=$(( Nfilesinfolders + filesinfolder ))
     else
         zenity --error --title="Error occured check message" --text="The directory\n $directory\n is not readable or write-able to you $USER\n please run as root"
         exit $?
    fi
done

Here are then some of my failed attempts

find "$directory" -depth -type d -print0 | while IFS= read -r -d $'\0' currentdir
do
    echo "Checking "$currentdir" in directory "$directory""
    if [[ ! -r "$currentdir" ]] && [[ ! -w "$currentdir" ]]
        then
            zenity --error --title="Error occurred check message" --text="The directory\n $currentdir\n is not readable or write-able to you $USER\n please run as root"
            exit $?
fi
   done

The above code seems like its just getting skipped and continues on the script.

The next one looked like this. I could get it to report an error but not tell me what folder that went wrong.

shredout=$(find "$directory" -depth -type d -print0 2>&1 | grep "Permission denied" && echo "found Permission Denied" && checkfolderperm="1" )

if [[ $checkfolderperm -eq 1 ]] 
    then
        zenity --error --title="Error occurred check message" --text="The directory\n $directory\n is not readable or write-able to you $USER\n please run as root"
        exit $?
fi

But the above also seems like its just getting skipped.

the last one is all-most like my first try.

while IFS= read -r -d $'\0' currentdir; do
    echo "going through file = $currentdir in folder $directory"
    if [[ ! -r "$currentdir" ]] && [[ ! -w "$currentdir" ]]
        then
        zenity --error --title="Error occured check message" --text="The directory\n $currentdir\n is not readable or write-able to you $USER\n please run as root"
        exit $?
    fi
done < <(find "$directory" -depth -type d -print0)

but that also gets skipped.

Is there any way for me to go through folders with find. Then stop and report if a directory is permission denied.

I've come across bash "traps" and bash "functions" but can't figure out if they are my solution or how to use them.

---

This is the resulting code after help from "meuh". It stops the script and reports exactly what folder/folder's it doesn't have permission to. Hope it can help others like it did me.

if finderrors=$(! find "$directory" -depth -type d 2>&1 1>/dev/null)
    then 
        zenity --error --title="Error occurred check message" --text="$finderrors"
        exit $?
fi

Answer 1

find will set its return code to non-zero if it saw an error. So you can do:

if ! find ... 
then    echo had an error >&2
fi |
while ...

(I'm not sure what you want to do with the find output).

---

To collect all the error messages from find on stderr (file descriptor 2) you can redirect 2 to a file. Eg:

if ! find ... 2>/tmp/errors
then     zenity --error --text "$(</tmp/errors)"
fi |
while ...