Problem using -E option with paths containing spaces

All,

I have an issue making dar (I think) run a par2 script when the path to 
the par2 script has spaces in directory names.

I have tried to make the issue clear using the -E option on the command 
line, in the following.

This is part of work on my "dar-backup" scripts here: 
https://github.com/per2jensen/dar-backup

I have a test case 
(https://github.com/per2jensen/dar-backup/blob/main/test/test-path-with-spaces.sh), 
that currently fails.

Any insights or pointers to issues in my setup is very much appreciated.


This works (using escaped spaces in path to the -E option):
==========================================
➜ ~/.local/bin/dar_static_2.7.4 -Q -c '/tmp/TEST_FULL_2022-04-11' -N -B 
'/tmp/  abc/   def/dar-backup-test/bin/../backups.d/TEST' -E '/tmp/\ \ 
abc/\ \ \ def/dar-backup-test/bin/../conf/dar_par_create.duc "%p" "%b" 
"%N" "%e" "%c" 5'
PAR2 started: "/tmp/  abc/ 
def/dar-backup-test/bin/../conf/dar_par_create.duc"
creating PAR file for file /tmp/TEST_FULL_2022-04-11.1.dar ...


  --------------------------------------------
  6 inode(s) saved
    including 0 hard link(s) treated
  0 inode(s) changed at the moment of the backup and could not be saved 
properly
  0 byte(s) have been wasted in the archive to resave changing files
  0 inode(s) with only metadata changed
  0 inode(s) not saved (no inode/file change)
  0 inode(s) failed to be saved (filesystem error)
  5 inode(s) ignored (excluded by filters)
  0 inode(s) recorded as deleted from reference backup
  --------------------------------------------
  Total number of inode(s) considered: 11
  --------------------------------------------
  EA saved for 0 inode(s)
  FSA saved for 6 inode(s)
  --------------------------------------------

➜ ls -l /tmp/TEST_FULL_2022-04-11.1.dar*
-rw-rw-r-- 1 pj pj 654200 apr 11 15:19 /tmp/TEST_FULL_2022-04-11.1.dar
-rw-rw-r-- 1 pj pj  40324 apr 11 15:19 /tmp/TEST_FULL_2022-04-11.1.dar.par2
-rw-rw-r-- 1 pj pj 321244 apr 11 15:19 
/tmp/TEST_FULL_2022-04-11.1.dar.vol000+100.par2



This does not work (a path with spaces in "" to the -E option):
================================================================
➜ ~/.local/bin/dar_static_2.7.4 -Q -c '/tmp/TEST_FULL_2022-04-11' -N -B 
'/tmp/  abc/   def/dar-backup-test/bin/../backups.d/TEST' -E '/tmp/ 
abc/   def/dar-backup-test/bin/../conf/dar_par_create.duc "%p" "%b" "%N" 
"%e" "%c" 5'
sh: 1: /tmp/: Permission denied
Final memory cleanup...
Aborting program. An error occurred concerning user command execution: 
Fatal error on user command line: Ignore previous error on user command 
line and continue ?

➜ ls -l '/tmp/  abc/   def/dar-backup-test/bin/../conf/dar_par_create.duc'
-rwxrwxr-x 1 pj pj 1081 apr 11 12:53 '/tmp/  abc/ 
def/dar-backup-test/bin/../conf/dar_par_create.duc'






File referenced from "-B" option
=================================
# Switch to ordered selection mode, which means that the following
# options will be considered top to bottom
-am

# Backup Root dir
-R "/tmp/  abc/   def/dar-backup-test/"

# Directories to backup below the Root dir
-g "dirs"

# Directories to exclude below the Root dir
-P "dirs/exclude this one"

# compression level
-z5

# no overwrite, if you rerun a backup, 'dar' halts and asks what to do
-n

# size of each slice in the archive
--slice 4G

# bypass directores marked as cache directories
# http://dar.linux.free.fr/doc/Features.html
--cache-directory-tagging




File referenced from "-E" option
==================================
#! /bin/bash

echo "PAR2 started: \"$0\""

if [ "$1" = "" -a "$2" = "" -a "$3" = "" -a "$4" = "" -a "$6" = "" ]; then
   echo "usage: $0 <path> <basename> <slice number> <extension> 
<context(not used)> <redundancy ratio (%)>"
   echo "$0 builds Parchive redundancy file for the given slice"
   exit 1
fi

# change according to you need
PAR=par2

echo "creating PAR file for file $1/$2.$3.dar ..."

exec "$PAR" c -r"$6" -n1 "$1/$2.$3.$4" >/dev/null 2>&1


Directory structure shown by "find":
=======================================
➜  find "/tmp/  abc/   def/dar-backup-test/"
/tmp/  abc/   def/dar-backup-test/
/tmp/  abc/   def/dar-backup-test/backups.d
/tmp/  abc/   def/dar-backup-test/backups.d/TEST
/tmp/  abc/   def/dar-backup-test/dirs
/tmp/  abc/   def/dar-backup-test/dirs/compressable
/tmp/  abc/   def/dar-backup-test/dirs/compressable/Lorem Ipsum.txt
/tmp/  abc/   def/dar-backup-test/dirs/exclude this one
/tmp/  abc/   def/dar-backup-test/dirs/exclude this one/In exclude dir.txt
/tmp/  abc/   def/dar-backup-test/dirs/include this one
/tmp/  abc/   def/dar-backup-test/dirs/include this one/Krummi.JPG
/tmp/  abc/   def/dar-backup-test/dirs/include this one/Abe.jpg
/tmp/  abc/   def/dar-backup-test/bin
/tmp/  abc/   def/dar-backup-test/bin/ls-archives.sh
/tmp/  abc/   def/dar-backup-test/bin/dar-backup.sh
/tmp/  abc/   def/dar-backup-test/bin/dar-util.sh
/tmp/  abc/   def/dar-backup-test/bin/install.sh
/tmp/  abc/   def/dar-backup-test/bin/dar-diff-backup.sh
/tmp/  abc/   def/dar-backup-test/bin/show-FULL.sh
/tmp/  abc/   def/dar-backup-test/bin/show-DIFF.sh
/tmp/  abc/   def/dar-backup-test/bin/dar-inc-backup.sh
/tmp/  abc/   def/dar-backup-test/FULL-filelist.txt
/tmp/  abc/   def/dar-backup-test/conf
/tmp/  abc/   def/dar-backup-test/conf/dar_par_create.duc
/tmp/  abc/   def/dar-backup-test/conf/dar_par_test.duc
/tmp/  abc/   def/dar-backup-test/conf/dar-backup.conf
/tmp/  abc/   def/dar-backup-test/conf/dar_par.dcf