On Sun, Jan 08, 2012 at 04:29:43PM +0100, Robert Millan wrote: > El 8 de gener de 2012 16:20, Roger Leigh <[email protected]> ha escrit: > > If we don't do that, then we are left running the old /sbin/init binary, > > which is an important part of the upgrade. > > Only until reboot. A reboot is necessary for the upgrade anyway > (needed by kernel). > > > Or if telinit/init return an error code, we can loop until it succeeds. > > That could work, yes. If init didn't act upon SIGUSR1 yet, its > initctl handle is for a node that no longer exists in the file system. > Then the only way for it to receive commands is to re-open > $OLDINITCTL which is now a symlink. > > Btw, isn't step 6 a pre-requisite for step 2?
No, 2) is replacing with a symlink, while 6) is removing the now unneeded symlink. I noticed that if you mv /dev/initctl /dev/initctl.old, init (I presume) immediately recreates /dev/initctl. The following sequence appears to work: # New control channel mkfifo /run/initctl # Symlink to new channel ln -s /run/initctl /dev/initctl.new # Replace existing channel with symlink mv /dev/initctl.new /dev/initctl # Reopen control channel (now /run/initctl) kill -SIGUSR1 1 # Replace init with new version using new paths init u # Delete old path [rm /run/initctl] If /dev/initctl is not open or is invalid, "init u" exits with an error, so we can loop on this in the postinst to wait until it's reopened. It's pretty quick though, so perhaps loop a fixed number of times and then continue with a warning if not possible, especially since it's not fatal? Regards, Roger -- .''`. Roger Leigh : :' : Debian GNU/Linux http://people.debian.org/~rleigh/ `. `' Printing on GNU/Linux? http://gutenprint.sourceforge.net/ `- GPG Public Key: 0x25BFB848 Please GPG sign your mail. _______________________________________________ Pkg-sysvinit-devel mailing list [email protected] http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-sysvinit-devel
