| bergkatten | Hi, I'm customizing the ubuntu livecd and need to be able to 1: run a post installation script to pull some files after the installer is done, 2: would be nice to have the hd encryption as default setting if the user does not have other preferences. | 13:10 |
|---|---|---|
| xnox | i am getting installer hangs. | 14:56 |
| CarlFK | bergkatten: you know about the preeseed file? I don't know where a good place for you to start is, but I found this: https://help.ubuntu.com/community/LiveCDCustomizationFromScratch | 14:57 |
| xnox | i'm not sure we can do without swap partition in ubiquity. or i'm doing it wrong. | 14:57 |
| bergkatten | <xnox>: thanks i'm looking at the link | 15:49 |
| bergkatten | i've found this one: https://help.ubuntu.com/community/LiveCDCustomization , not so far :) | 15:51 |
| * xnox was talking to myself really =) | 15:54 | |
| * xnox is deep into fixing things | 15:55 | |
| CarlFK | xnox: append file=/cdrom/preseed/ubuntu.seed https://help.ubuntu.com/lts/installation-guide/example-preseed.txt #d-i preseed/late_command string apt-install zsh; in-target chsh -s /bin/zsh | 15:57 |
| CarlFK | that is your post installation script | 15:57 |
| xnox | From https://wiki.ubuntu.com/UbiquityAutomation | 16:01 |
| xnox | you may also use: ubiquity/success_command: similar to preseed/late_command. Specify a command to be run when the install completes successfully (runs outside of /target, but /target is mounted when the command is invoked). | 16:01 |
| bergkatten | <CarlFK>: i'll a basic preseed now to see if it's being triggered even when starting the installer from the desktop in a "try ubuntu" session, bbl | 17:35 |
| CarlFK | "post installation script to pull some files after the installer is done" Ummm... that does not sound like "try ubuntu" session | 17:43 |
| === ahoneybun_ is now known as ahoneybun | ||
| xnox | CarlFK, if you want to customize live-session -> without affecting installed system, you need to apply tweaks at casper level (this is what differentiates live-session vs installed system) | 22:10 |
| xnox | if you want to affect both, you need to respin the livecd rootfs / rebuild squashfs. | 22:10 |
| CarlFK | xnox: keep in mind I don | 22:12 |
| CarlFK | er | 22:12 |
| CarlFK | xnox: keep in mind I don't want any of this. bergkatten want's something, but i am not really sure what now. | 22:12 |
| CarlFK | I use pxe to boot the installer + preseed | 22:13 |
| xnox | hehe. | 22:15 |
| xnox | sorry, lost track of who requested what =) | 22:15 |
| bergkatten | i'd like to be able to allow the installer run ready after the user started a "try ubuntu" session and when the installer is successfully done a postinstall script should be run in /target. | 22:15 |
| bergkatten | basically i read it here: https://wiki.ubuntu.com/UbiquityAutomation that: "ubiquity/success_command: " would do what i want but not in chroot /target | 22:19 |
| bergkatten | i which to join a puppet server in that script | 22:19 |
| superm1 | xnox: this swapfile by default, any ideas what scenarios it doesn't play friendly with? i seem to recall there was a big enough list a few years back that it didn't happen | 22:30 |
| superm1 | maybe hibernate was one? | 22:31 |
| xnox | superm1, we do not support hibernate out of the box since trusty | 22:35 |
| xnox | (disabled by default) | 22:35 |
| superm1 | oh, i see | 22:36 |
| xnox | (or maybe even before that) | 22:36 |
| superm1 | but so if someone tried to enable hibernate that probably does also break when using a swapfile | 22:36 |
| xnox | superm1, in practice swap is not used by default, but we want to have /some/ swap available when things balloon. | 22:36 |
| superm1 | right | 22:37 |
| xnox | superm1, why not? hybernating to swapfile should work if one (a) resizes swapfile to be larger (b) adjusts resume line | 22:37 |
| xnox | superm1, i have a workitem open to check how easy/hard hibernation to swapfile is. | 22:37 |
| xnox | superm1, note that with lvm or fulldisk encryption (uses LVM on LUKS) swap is still an LVM volume. | 22:38 |
| superm1 | xnox: ah okay good. i guess you can make the swapfile on demand, which actually makes it more flexible too | 22:38 |
| superm1 | in that you can create the right size file immediately | 22:38 |
| superm1 | and if you change RAM in teh system, you aren't screwed by making swap the wrong size at installation | 22:38 |
| xnox | there is a small minority that advocates allocating swapfile upon initiating hibernation..... | 22:38 |
| xnox | the biggest driver is that swap is not longer useful, and default installation sizes are wrong too. | 22:39 |
| superm1 | the most important thing in my mind is that the file is contiguous for hibernation | 22:39 |
| superm1 | especially if you're on a spindle | 22:39 |
| xnox | e.g. 32GB swap partition on NVMe drive with 16GB of RAM is a waste of NVMe disk space | 22:39 |
| superm1 | yeah | 22:39 |
| superm1 | the reason i'm bringing up hibernation, is that it becomes extra interesting as machines start to use suspend-to-idle instead of s3 by default | 22:40 |
| xnox | hence swapfile is limited to 5% of rootfs free disk space, or 1 GB, whatever is largest (tweakable) | 22:40 |
| superm1 | you really do want to start having suspend-to-idle + hibernate on a timer | 22:40 |
| superm1 | like how hybrid-s3 works | 22:40 |
| xnox | i don't know what suspend-to-idle means. My understanding is that "suspend" has become the thing to do, and it has become ever more power efficient thing to do. | 22:41 |
| superm1 | suspend to idle is the linux equivalent of "disconnected standby" | 22:42 |
| superm1 | rather than turning everything but RAM off, the CPU goes into a super low power state | 22:43 |
| superm1 | the kernel freezes all tasks | 22:43 |
| superm1 | and the kernel puts all the devices into D3cold | 22:43 |
| superm1 | on new hardware it's as good or better than S3 | 22:43 |
| superm1 | once this is merged, it will become more commonly used by default: http://www.spinics.net/lists/linux-acpi/msg70357.html | 22:44 |
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