Re: Running from script - quotes being ignored?

On 7/8/2025 11:10 PM, [email protected] wrote:
> 
> On 7/8/2025 8:59 AM, Andy Hairston via Duplicity-talk wrote:
>> I'm sure this is more of a bash scripting issue, but I'm pretty well stuck. I've been running duplicity via bash scripts for several years, and went to add an option to specify compression level - and now the script won't work. Here's the script, minus some private items (and boiled down to just what is needed to reproduce the issue):
>>
>> export B2BUCKET=[snip]
>> export DUPLICITY_CMD="pipx run duplicity"
>> BACKUP_COMMAND="$DUPLICITY_CMD backup --gpg-options='--compress-algo=bzip2 --bzip2-compress-level=9'"
>> echo -E $BACKUP_COMMAND /home/[snip] ${B2BUCKET}
>> $BACKUP_COMMAND /home/[snip] ${B2BUCKET}
>>
>> If I run this, I get:
>> pipx run duplicity backup --gpg-options='--compress-algo=bzip2 --bzip2-compress-level=9' /home/[snip] [snip]
>> CommandLineError: Wrong number of positional args for 'backup', got 3
>> Expected 2 positionals from ["--bzip2-compress-level=9'", '/home/[snip]', '[snip]'].
>> Enter 'duplicity --help' for help screen.
>>
>> But if I copy the outputted line "pipx run duplicity ...", paste it into the command line, and run it, it runs fine. It's almost like the single-quotes around the gpg-options are being ignored, passing only the --compress-algo=bzip2 argument to gpg-options, and saving the bzip2-compress-level option for duplicity's backup command.
>>
>> I know I could put the entire thing on one line, but I had split it into command and arguments due to running multiple commands (remove-older-than, for instance). This works, and is my temporary workaround:
>> $DUPLICITY_CMD backup --gpg-options='--compress-algo=bzip2 --bzip2-compress-level=9' /home/[snip] ${B2BUCKET}
>>
>> Any idea what I'm doing wrong in my export commands, causing the quotes to be ignored?
> 
> more a shell than a duplicity issue. read more here
>   https://stackoverflow.com/questions/59910932/bash-passing-parameters-to-a-c-program-via-shell-variable-how-to-deal-with-spa
> 
> tl;dr
>   either use `eval` e.g. `eval $BACKUP_COMMAND /home/[snip] ${B2BUCKET}`
> or if you don't trust your own parameters
>   use bash and parse the string into a bash array and run that
> ```
> declare -a command="( $BACKUP_COMMAND )"
> "${command[@]}"
> ```

btw. much easier of course would be to rethink your variable structure, notice the "" around $GPG_OPTS to keep it together as one parameter (no need for `export` btw.)

B2BUCKET=[snip]
DUPLICITY_CMD="pipx run duplicity"
GPG_OPTS="--gpg-options='--compress-algo=bzip2 --bzip2-compress-level=9'"
$DUPLICITY_CMD backup "$GPG_OPTS" /home/[snip] ${B2BUCKET}

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