Hi! I have noticed that there is some seconds in the shutdown sequence that might be wasted by properly shutting down services that we don't care much about.
Here is the current init scripts that are currently called (same scripts
and order for shutdown and reboot sequences) in Tails 0.11 and an
analysis of what might be removed:
First batch
-----------
All these scripts are run at the same priority (and time):
* alsa-utils
Store soundcards levels. As we are amnesic, candidate for
**removal**.
* fuse
Unmount fuse filesystems and remove kernel module. Sounds
like a good idea to keep it to avoid data loss.
* gdm3
Stop the graphical environment. Keep?
* gdomap
Stop the "GNUstep distributed object mapper". Let init kill it:
**remove**.
* haveged
Stop the entropy daemon. Let sendsigs kill it: **remove**.
* kexec-load
Load kernel and initrd. Keep.
* laptop-mode
Revert laptop settings. I think that's actually not a good thing to
do. **Remove**
* memlockd
Stop memlockd. Memwipe files will not kept in memory after that.
Better let sendsigs kill it, or even, add its PID to
/var/run/sendsigs.omit. **Remove**
* network-manager
Stop Network Manager. Maybe we ought to keep it to release DHCP
leases?
* pdnsd
Stop the proxy DNS server. sendsigs can do it: **remove**
* polipo
Stop the polipo daemon. sendsigs can do it: **remove**
* resolvconf
Cleanup /etc/resolv.conf. No need to, we are amnesic: **remove**
* saned
Does nothing except print a warning: **remove**
* spice-vdagent
Stop the agent daemon for Spice guests. sendsigs can do it: **remove**
* ttdnsd
Stop ttdnsd. sendsigs can do it: **remove**
* urandom
Save the random seed. We are amnesic: **remove**
* virtualbox-guest-utils
Stop VBoxService daemon. I am unsure. Is it needed to properly
unmount virtualbox shares?
Following sequence
------------------
And then, in order:
* tor
Stop Tor. We could probably leave that to sendsigs.
* sendsigs
Send TERM signals to every remaining process and then KILL if any
remains.
* rsyslog
Shutdown the logging daemon. Keep?
* umountnfs.sh
Umount NFS mountpoints. Keep.
* networking
Unconfigure networking. As we are using network-manager
* ifupdown
Clean ifupdown status. We are amnesic: **remove**.
* open-vm-tools
Stop VMWare daemon and modules. I say **remove**.
* umountfs
Unmount filesystems which are not root. Keep.
* cryptdisks
Deconfigure dm-crypt volumes. Keep.
* lvm2
Deconfigure LVM volumes. Keep.
* cryptdisks-early
Deconfigure dm-crypt for root volumes. No need for Tails: **remove**.
* umountroot
Unmount root filesystem. Keep?
* live-boot
Resyncing snapshots and cache reboot files. That can be removed for
Tails, right?
* tails-kexec
Keep, captain obvious.
What do other thinks?
Any advice on how to implement the removal of those extra scripts?
A hook with a bunch of `rm` commands? It looks like `update-rc.d` really
wants to have shutdown scripts in place...
--
Ague
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