Re: [PLUG] Determining when a shell script is sourced

[Tone Montone <tonemontone@gmail.com>]

I don’t remember ever sourcing a script... Could you check for a pid for the running script/process?  If there is no pid, then it’s being sourced, then exit or kill the sourcing?

Sent from my iPhone

> On Apr 18, 2019, at 5:59 PM, brent timothy saner <brent.saner@gmail.com> wrote:
> 
>> On 4/18/19 5:27 PM, K.S. Bhaskar wrote:
>> We have a shell script (starts with #!/binsh and is at
>> https://gitlab.com/YottaDB/DB/YDB/blob/master/sr_unix/ydbinstall.sh)
>> that should preferably not be source'd. Is there a way to test within
>> the script whether someone has source'd it and generate an error without
>> terminating the shell session that source'd it? Thank you very much.
>> 
>> Regards
>> – Bhaskar
>> 
> 
> 
> https://stackoverflow.com/a/28776166/11365825 is probably the best
> answer on this; a lot of it depends on whether your /bin/sh is linked to
> bash, or if you need it to be POSIX-capable (i.e. /bin/sh is actually
> Bourne instead of Bourne Again, or it's ASh, or something).
> 
> a couple big problems are:
> 
> - the $BASH_SOURCE array is bash-only
> 
> - $BASH_SOURCE doesn't reliably detect if something is sourced or not,
> just if it's an interactive command entered vs. from a file (invoked or
> sourced)
> 
> - $_ doesn't work very reliably; you have ONE shot to capture it in the
> script before it goes wonky:
> 
> $ echo 'this is an interactive command'
> this is an interactive command
> $ echo $_
> this is an interactive command
> $ /tmp/test.sh
> /tmp/test.sh
> $ . /tmp/test.sh
> _filedir
> $ . /tmp/test.sh
> /tmp/test.sh
> 
> $ cat /tmp/test.sh
> #!/bin/bash
> 
> echo ${_}
> 
> 
> I'd stick to the POSIX-compat snippet in the answer I linked on SO,
> since that has the least chance of futzing up.
> 
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