NAME

       invoke-run - runscript interpreter

SYNOPSIS

       /usr/bin/env /lib/run/invoke-run

DESCRIPTION

       The  runit  supervision  system  uses  scripts,  called  runscripts  to  start and supervise services. By
       convention,   a   runscript   for   a   service   foo   is   located    at    /etc/sv/foo/run    or    at
       /usr/share/runit/sv.current/foo/run : runscript can be any executable file.

       Debhelper addon dh_runit installs the runscript according to this convention.

       To use the invoke-run interpreter, the runscript for a service foo must begin with following line:

           #!/usr/bin/env /lib/runit/invoke-run

       If  a  file  /.meta/bin is found inside the foo service directory, the path inside the bin file is tested
       for existence and if not found on the system, the service foo is stopped. The  bin  file  should  contain
       only one line with the full path of the binary that is executed in the runscript.

       If  the  init.d script /etc/init.d/foo exists, is executable and is not a symlink, it is invoked with the
       stop argument to gracefully replace the Sysv instance with the runit managed instance .

       If the file /etc/runit/verbose exists, the message invoke-run: starting foo is printed. After  that,  the
       runscript  is  interpreted with /bin/sh shell and some additional environment variables are set according
       to the following rules:

           If file /etc/default/foo exists, it is interpreted with  /bin/sh  and  all  variable  assignment  are
           accessible to runscript.

           If  directory  /etc/sv/foo/env  exists,  variables  are  set according to rules, documented in envdir
           section of chpst(8) manual.

       If both /etc/default/foo file and /etc/sv/foo/env directory define some variable,  value  from  directory
       takes precedence.

           Older  versions  of invoke-run exported a NAME=foo variable and included the /etc/default/runit file;
           the shell expansion ${PWD##*/} can be used in  place  of  NAME  inside  the  run  and  finish  files;
           /etc/runit/verbose  and  /etc/runit/debug  flags  files  can  be  used  in  place of variables inside
           /etc/runit/default

SPECIAL ERROR CODE

       Looking in the foo service log it's possible to see messages in the form of

         invoke-run: ERROR [NNN] in foo: reason for the error

       These messages don't come from runsv itself but from invoke-run, the run file or  the  finish  file.  The
       purpose  of these message is to detail a permanent failure condition that prevents foo service from being
       up.  For each foo service, defined errors and messages are:

         invoke-run: foo binary not installed

           this happens when the package containing foo binary has been removed, but not purged.

         invoke-run: ERROR -1 in foo: runscript didn't exit normally

           this message comes from the finish file, but the exit code comes from runsv(8) and is  documented  in
           its manpage.

         invoke-run: WARNING for foo: disabled by local settings

           Some service specific setting prevent foo from starting; it's likely something in /etc/default/foo

         invoke-run: ERROR 162 in foo: configtest or early setup failed

           A  configuration  file  of foo is malformed and the configtest failed; foo log may contain additional
           info from the test itself.  Alternatively the runscript has failed to do some setup that is essential
           to the foo service.

         invoke-run: ERROR 170 in foo: a runtime hard dependency is missing

           A dependency failed the check and can't be bring up; to know dependencies of foo service look for "sv
           start" in "run" script.

FINISH FILE AND FINISH-EXEC

       Since version 2.1.2-48 the Debian runit package ships a /lib/runit/finish-exec file  that  contains  code
       that  can  be shared across different services.  This file can be symlinked inside the service directory,
       or can be exec'd like in the following example

        $ cat /etc/sv/foo/finish
       #!/bin/sh
       set -e

       exec /lib/runit/finish-exec "$@"

       Services that need to put specific code into the finish file should do before the line that exec  finish-
       exec.  Finish-exec  defines  special  error  codes  as  described  in  the  previous section. If the file
       /etc/runit/verbose exists, a 'foo stopped' message is printed; if the file /etc/runit/debug exists, run's
       exit code is also printed.  The finish-default shipped by previous runit package is  now  deprecated  and
       scheduled removal in the near future.

SEE ALSO

       runsvdir(8), dh_runit(1), chpst(8)

                                                  Aug 29, 2022                                     INVOKE-RUN(8)