commit 8f9003c1c2f0c1d2e4331a6f5195b9b6347e116d
parent f7a65ab11c21dfd114e46458cf0d40b618dcc2bd
Author: Cem Keylan <cem@ckyln.com>
Date: Tue, 7 Jul 2020 15:46:13 +0300
docs: update
Diffstat:
2 files changed, 38 insertions(+), 4 deletions(-)
diff --git a/docs/service-scripts.txt b/docs/service-scripts.txt
@@ -1,4 +1,13 @@
-Creating Service Scripts
+SERVICE SCRIPTS
+--------------------------------------------------------------------------------
+
+TABLE OF CONTENTS
+- Creating service scripts [1.0]
+ - Service dependencies [1.1]
+ - Running commands after service stop [1.2]
+
+
+[1.0] Creating service scripts
--------------------------------------------------------------------------------
Service scripts can be anything from C binaries to shell scripts. All they need
@@ -26,7 +35,7 @@ Another thing you may have noticed is the 'exec' part of the service. In shell,
This is also necessary to track the correct process.
-Service dependencies
+[1.1] Service dependencies
--------------------------------------------------------------------------------
Some services may depend on other services in order to start working. An example
@@ -47,7 +56,32 @@ dependencies. Here are example service scripts for NetworkManager and dbus.
+--------------------------------------------------------------------------+
| |
| #!/bin/sh |
- | sysmgr-needs dbus |
+ | sysmgr-needs dbus || exit 1 |
| exec NetworkManager -n |
| |
+--------------------------------------------------------------------------+
+
+
+[1.2] Running commands after service stop
+--------------------------------------------------------------------------------
+
+sysmgr doesn't come with a way to handling service stops. Runit has the 'stop'
+script and systemd comes with a 'ExecStop' command. This can be easily handled
+within the service script itself.
+
+ +--------------------------------------------------------------------------+
+ | /etc/sysmgr/agetty-1 |
+ +--------------------------------------------------------------------------+
+ | |
+ | #!/bin/sh |
+ | setsid agetty tty1 38400 linux & |
+ | |
+ | # Get the process id and replace the stored process id with agetty's |
+ | printf '%s\n' "$!" > /run/sysmgr/agetty-1/pid |
+ | wait |
+ | |
+ | # Wait until agetty dies and continue the script |
+ | utmpset -w tty1 |
+ | |
+ +--------------------------------------------------------------------------+
+
diff --git a/sysmgr b/sysmgr
@@ -176,7 +176,7 @@ fn_runsyssv() {
trap "redirectsignal $sig" $sig
done
- # Wait until service goes down
+ # Wait until service goes down.
wait
# Do a cleanup when the service is killed.
