https://github.com/buganini/rcexecr

Parallel rc.d scripts executer for FreeBSD
https://github.com/buganini/rcexecr

Last synced: about 1 year ago
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Parallel rc.d scripts executer for FreeBSD

• Host: GitHub
• URL: https://github.com/buganini/rcexecr
• Owner: buganini
• Created: 2011-06-01T06:49:29.000Z (about 15 years ago)
• Default Branch: master
• Last Pushed: 2012-12-23T14:10:21.000Z (over 13 years ago)
• Last Synced: 2025-02-17T14:44:38.678Z (over 1 year ago)
• Language: C
• Homepage:
• Size: 175 KB
• Stars: 4
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README

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README

          
rcexecr is modified from rcorder(8) from freebsd(/netbsd)

It aims to do things that rcorder and part of /etc/rc do in parallel.

Test with modification on /etc:

	#install

	cd /usr/src/sbin/

	git clone git://github.com/buganini/rcexecr.git

	cd rcexecr

	sudo make all install

	#patch /etc

	cd /etc/

	patch -p1 < /usr/src/sbin/rcexecr/etc.patch.txt

	#enable parallel execution

	echo rcexecr_parallel="YES" >> /etc/rc.conf

	#reboot

	shutdown -r now

Test without affecting system:

	cd /usr/src/sbin/

	git clone git://github.com/buganini/rcexecr.git

	cd rcexecr

	sudo make

	env ARG0=\? ARG1=start./rcexecr /etc/rc.d/*

	env ARG0=\? ARG1=stop ./rcexecr -r /etc/rc.d/*

	#add -x to actually execute

	env ARG0=\? ./rcexecr -x testcase/rc.d/*

	#test self modification

	chmod -R 755 testcase/

	env ARG0=\? ./rcexecr -x testcase/rc.d/*

Progress:

	beg/end calculation: done

	fork/exec/waitpid/-x(execute, or dry print): done

	-r(reverse, for /etc/rc.shutdown): done

	self modification: done

	patch for /etc: done

	update document: partial

Concept:

	beg/end: the proper timing to launch script / wait it finished.

	When a node's requirement is satisfied, it would be launched by fork()+exec().

	When a node is required to be done, it would be waited for by waitpid().

	the whole schedule is reversed with -r.

	Circular dependency detecting:

		see https://github.com/buganini/rcexecr/commit/8460c6006dd041fe4920047ee80c3bd19896f493

	Self modification:

		consider the dependencies as a graph, the files as nodes,

		when subprocess exec(rcexecr), the node take whole graph as input,

		and regenerate it with adding new node.

		approach:

			if (getenv("RCEXECR")!=NULL) {

				//send new items to the nexus by writing to pipe.

				exit(0);

			} else {

				setenv("RCEXECR", pipe-fd);

			}

			after receiving new items, call regenerate(),

			which exit() directly.

Todo:

	zombieskiller (but this need another mapping and lookup)