[erlang-questions] problem running escript upon linux startup

Roger Critchlow rec@REDACTED
Wed Apr 1 19:54:31 CEST 2009

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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