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plugins: hook-scripts: Add

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Add a plugin that will allow the user to trigger the execution of
scripts from plugin hook points. This is particularly useful for early
boot debugging that needs to take place before regular services are
available.

For example, let's say that you want to enable some kernel tracing
before modules are loaded. With hook-scripts, you can just drop in a
shell script in /libexec/finit/hook/mount/all/ that will poke the
right control files in tracefs.
This commit is contained in:
Tobias Waldekranz committed 2022-05-06 10:36:37 +02:00
1 parent b368bd1420
commit b62c975dc4
4 files changed
+137
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configure.ac
+11
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@@ -90,6 +90,7 @@ AC_PLUGIN([modprobe], [yes], [Coldplug modules using modalias magic])
AC_PLUGIN([resolvconf], [no], [Setup necessary files for resolvconf])
AC_PLUGIN([x11-common], [no], [Console setup (for X)])
AC_PLUGIN([netlink], [yes], [Basic netlink plugin for IFUP/IFDN and GW events. Can be replaced with externally built plugin that links with libnl or similar.])
AC_PLUGIN([hook-scripts], [no], [Trigger script execution from hook points])
AC_PLUGIN([hotplug], [yes], [Setup and start udev or mdev hotplug daemon])
AC_PLUGIN([rtc], [yes], [Save and restore RTC using hwclock])
AC_PLUGIN([tty], [yes], [Automatically activate new TTYs, e.g. USB-to-serial])
@@ -146,6 +147,11 @@ AC_ARG_WITH(watchdog,
AS_HELP_STRING([--with-watchdog=[DEV]], [Enable built-in watchdog, default: /dev/watchdog]),
[watchdog=$withval], [with_watchdog=no watchdog=])
AC_ARG_WITH(hook-scripts-path,
AS_HELP_STRING([--with-hook-scripts-path=DIR], [Base directory for hook scripts, default $libexecdir/finit/hook]),
[hook_scripts_path=$withval], [hook_scripts_path=yes])
### Enable features ###########################################################################
# Create config.h from selected features and fallback defaults
@@ -240,6 +246,11 @@ AS_IF([test "x$with_watchdog" != "xno"], [
AC_DEFINE_UNQUOTED(WDT_DEVNODE, "$watchdog", [Built-in watchdog device node])], [
watchdog=])
AS_IF([test "x$enable_hook_scripts_plugin" = "xyes" -a "x$with_hook_scripts_path" != "xno"], [
AS_IF([test "x$hook_scripts_path" = "xyes"], [hook_scripts_path=$libexecdir/finit/hook])
AC_EXPAND_DIR(hook_scripts_path, "$hook_scripts_path")
AC_DEFINE_UNQUOTED(PLUGIN_HOOK_SCRIPTS_PATH, "$hook_scripts_path", [Built-in default: $libexecdir/finit])])
# Control build with automake flags
AM_CONDITIONAL(STATIC, [test "x$enable_static" = "xyes"])
AM_CONDITIONAL(KEVENTD, [test "x$with_keventd" != "xno"])