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Tasklist

FS#24712 - [initscripts] Additional hook in rc.sysinit just before /usr is being used

Attached to Project: Arch Linux
Opened by Jozef K. (jofko) - Monday, 13 June 2011, 20:34 GMT
Last edited by Tom Gundersen (tomegun) - Sunday, 19 June 2011, 17:08 GMT
Task Type Feature Request
Category Arch Projects
Status Closed
Assigned To Tom Gundersen (tomegun)
Architecture All
Severity Medium
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

background:

Currently in rc.sysinit there is no hook before some binary from /usr is being called.
This makes hard to maintain /usr in RAM and similiar configurations as it cuts possiblity to create own /etc/rc.d/functions.d/function

Request:

Add hook sysinit_mountfinished or something similiar to rc.sysinit

<e.g.>
run_hook sysinit_premount
# now mount all the local filesystems
/bin/mount -a -t $NETFS -O no_netdev
run_hook sysinit_mountfinished
</e.g.>

   mountfinished.patch (0.4 KiB)
This task depends upon

Closed by  Tom Gundersen (tomegun)
Sunday, 19 June 2011, 17:08 GMT
Reason for closing:  Implemented
Comment by Tom Gundersen (tomegun) - Monday, 13 June 2011, 23:20 GMT
Hmmm... I won't say "no" to implementing this, but I'm extremely reluctant.

This is the reason: having /usr on a separate partition from / does not work reliably as it is. Instead things fail silently and you might get weird problems.

The reason is that many upstream projects simply don't try to support this setup. In particular, several projects add udev rules which call binaries in /usr, and these rules will probably be triggered before /usr is mounted. What this means for your system might vary, on my current computer the following packages would not work correctly with a separate /usr (do "grep /usr /lib/udev/rules.d/*":

90-alsa-restore.rules is owned by alsa-utils 1.0.24.2-1
10-dm.rules is owned by device-mapper 2.02.85-2
85-usbmuxd.rules is owned by usbmuxd 1.0.6-2
70-infrared.rules is owned by v4l-utils 0.8.4-1

There might be other non-udev related problems that I'm not aware of.

With this in mind, do you still want to push for this change? Do you have a use-case that cannot be solved by moving /usr to /?

Sorry for the somewhat negative response, this is one of my pet-peeves ;-)




Just as I was about to post this, I was convinced that (independently of the particular use-case you mentioned) hooks might not be as evil as I thought. So if you post a git formated patch to arch-projects@archlinux.org, it will probably be accepted :-) Thanks for your contribution!
Comment by Jozef K. (jofko) - Tuesday, 14 June 2011, 19:20 GMT
Thanks, I did try but I failed...patch for working repo attached, let me know if you need it for master

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From: <arch-projects-owner@archlinux.org>
Date: Tue, Jun 14, 2011 at 8:57 PM
Subject:  FS#24712  - [initscripts] Additional hook in rc.sysinit just before /usr is being used
To: joffko@gmail.com


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   0001-Adding-hook-sysinit_moun... (0.8 KiB)
Comment by Tom Gundersen (tomegun) - Sunday, 19 June 2011, 17:08 GMT
I renamed the hook "postmount" to fit with "premount", and pushed it.

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