[erlang-questions] problem running escript upon linux startup

[Kris Prieb]

Thanks!  I will try that.

Kris Prieb

On Wed, Apr 1, 2009 at 12:54 PM, Roger Critchlow <rec@REDACTED> wrote:
> I believe that the %%! -env setting in the script takes place too late
> to satisfy the erlang runtime.
>
> If the script is being launched from another script, inside
> /etc/rc.local, then try this:
>
> HOME=/root path-to-escript
>
> or this:
>
> env HOME=/root path-to-escript
>
> which do the same thing, launch the command with the HOME environment
> set to /root
>
> -- rec --
>
> On Tue, Mar 31, 2009 at 1:50 PM, Kris Prieb <kris_prieb@REDACTED> wrote:
>> Hello list,
>>
>> The following escript fails when run upon linux (ubuntu) startup:
>>
>> #!/usr/bin/escript
>> %% -*- erlang -*-
>> %%! -env HOME /root
>> main(_) -> file:write_file("/root/simple_start_output", "bunch of text").
>>
>> The program should create a file called "simple_start_output," under
>> the root directory, but no such file appears when I log into the
>> system.
>> A look at /var/logsyslog/ reveals a "erlexec: HOME must be set"
>> message resulting from the execution of the script.  The strange thing
>> is that the script works fine when I run it after logging in.
>>
>> I've tried variations of the script such as:
>>
>> 1. using "/root" instead of /root when setting the HOME environment
>> variable in the 3rd line of the script
>> 2. excluding the 3rd line of the script entirely
>> 3. using "/usr/bin/env escript" instead of calling "/usr/bin/escript"
>>
>> All scripts result in the same error,  "erlexec: HOME must be set,"
>> when run at startup.  However, they all work when run after logging
>> in.  Does anyone have an idea of how to get an escript to run at
>> startup??  Any thoughts would be greatly appreciated.  Thanks!
>>
>> Kris Prieb
>>
>> (I should also mention that I am actually running the script at the
>> launch of an Amazon EC2 virtual server, not on a machine that is
>> physically in front of me.  Not sure if that matters one way or
>> another.)
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>