IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 2 September 2019 (all times are UTC)
| 04:55 | <alkisg> rc.d/X95-run-x-session: XDG_SEAT=${XDG_SEAT:-seat0} XDG_VTNR=${SCREEN_NUM#0} su - ${LDM_USERNAME} -c "$CLIENT_ENV $MY_LANG DISPLAY=$DISPLAY ICEAUTHORITY=$ICEAUTHORITY XAUTHORITY=$XAUTHORITY $LDM_XSESSION $LDM_SESSION"
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| 04:55 | That's why I'm always complaining to quote things :D
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| 04:55 | su - "$LDM_USERNAME" should at least fail there
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| 05:12 | <vagrantc> oh, that would be interesting
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| 05:12 | that's a pretty simple fix for that ... still would like to know *why* it's happening
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| 05:19 | * alkisg could look into it but later, maybe in a couple of weeks... | |
| 05:20 | <alkisg> su - "" -c whoami
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| 05:20 | root
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| 05:20 | Bah
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| 05:21 | <vagrantc> su - "" -c whoami
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| 05:21 | su: user does not exist
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| 05:21 | works as desired on buster...
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| 05:22 | <alkisg> Maybe fixed on buster... we can't rely on that though :/
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| 05:22 | <vagrantc> test -z "${LDM_USERNAME}"
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| 05:22 | test -z "${LDM_USERNAME}" || exit 1
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| 05:22 | er... test -n ...
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| 05:22 | should
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| 05:22 | solve the issue ... just a question of where to put it
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| 05:23 | unless the guest/autologin stuff relies on that being empty... but not at that point, surely.
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| 05:24 | i think it's in the C code ... making some assumption about the user's shell
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| 05:24 | * alkisg would put it in ldm-script, xsession) | |
| 05:26 | <vagrantc> sounds feasible
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| 05:26 | * vagrantc will test a bit more... | |
| 05:26 | <vagrantc> some other day...
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| 05:26 | <alkisg> :)
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| 05:26 | shift change
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| 05:26 | <vagrantc> heh
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| 05:27 | <alkisg> vagrantc goes, alkisg comes, like the old days :D
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| 05:27 | <vagrantc> indeed
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| 12:11 | <alkisg> uumas, would you be willing for me to troubleshoot that ldm issue in your setup over vnc?
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| 12:11 | * alkisg has migrated to ltsp19, and would take some time to setup ltsp5 again... | |
| 12:19 | <uumas> alkisg: Sure! Do you have time now?
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| 12:20 | * uumas uses ansible, which makes spinning up a new vm take 15min of waiting and 1min of work. | |
| 12:20 | <alkisg> uumas, I have time in 30 mins, is it ok?
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| 12:21 | <uumas> Should be
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| 12:43 | <alkisg> uumas, ready, do either one of those:
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| 12:43 | !vnc-edide
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| 12:43 | <ltsp> vnc-edide: To share your screen with me, open Epoptes → Help menu → Remote support → Host: srv1-dide.ioa.sch.gr, and click the Connect button
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| 12:43 | <alkisg> !vnc-dide
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| 12:43 | <ltsp> vnc-dide: To share your screen with me, run this: sudo apt-get --yes install x11vnc; x11vnc -connect srv1-dide.ioa.sch.gr - this is a reverse connection, it doesn't need port forwarding etc.
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| 12:44 | <uumas> Ah, I'll need to find my way into a gui
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| 12:44 | <alkisg> uumas, doesn't the ltsp server have ui?
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| 12:44 | (or even the host outside it...)
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| 12:45 | <uumas> Yes, it does. Just not used to accessing it :D
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| 12:45 | <alkisg> Hehe
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| 12:45 | The quickest troubleshooting is with reverse vnc connections and then via epoptes to reach the clients
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| 12:46 | <uumas> Here we go
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| 12:47 | <alkisg> VNC is trying to receive a connection, but I think it fails
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| 12:47 | What does it say at your end?
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| 12:48 | <uumas> Nothing signaling an error, but could be the firewall we're put behind. I'll connect to a vpn to bypass that.
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| 12:56 | <alkisg_web> uumas, thunderstorm => my office went down, could you try: x11vnc -connect 46.246.200.86
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| 12:56 | <uumas> Oh wow xD
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| 12:57 | That ip doesn't even respond to ping
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| 12:57 | <alkisg_web> OK office is back up
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| 12:57 | Sorry for this, let's try this again:
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| 12:58 | !vnc-dide
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| 12:58 | <ltsp> vnc-dide: To share your screen with me, run this: sudo apt-get --yes install x11vnc; x11vnc -connect srv1-dide.ioa.sch.gr - this is a reverse connection, it doesn't need port forwarding etc.
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| 12:58 | alkisg has joined IRC (alkisg!~alkisg@ubuntu/member/alkisg) | |
| 13:09 | <alkisg> uumas, why doesn't fish allow normal shell commands like $(id -u)?
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| 13:14 | <uumas> alkisg: It does it using (id -u)
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| 13:15 | <alkisg> uumas, but then it's not a normal posix shell
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| 13:15 | So we can't use it in ltsp to run commands
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| 13:15 | OK so we have 3-4 things to address:
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| 13:16 | 1) Your cupsd is running at 100%; I'm wondering how you're able to work in your clients like this, with 1 cpu lost :D
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| 13:16 | (this doens't happen to other users though, might be something with your firewall etc; it's for you to find out)
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| 13:16 | <uumas> Doesn't almost every shell have a different syntax for that? Some shells have `id -u` which I believe also works on bash
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| 13:17 | <alkisg> `id -u` is supported in posix shells, but it's been deprecated by $()
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| 13:17 | 2) So, we need to find out how to run commands over ssh using sh, not the user shell
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| 13:18 | <uumas> ssh sh -c <command> ?
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| 13:18 | <alkisg> The problem starts with this line : IFS=':' read -r LDM_USERNAME dummy pw_uid pw_gid pw_gecos LDM_HOME pw_shell <<EOF
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| 13:18 | ssh runs the command with the user shell, so if fish blocks $(), it won't allow sh -c to run with them,
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| 13:18 | and ssh doesn't allow remote quoting either
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| 13:18 | So it would be best to send a shell script and execute it or something
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| 13:19 | or use ssh sh <<EOF, things like that
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| 13:19 | The failing line is at: /usr/share/ldm/rc.d/X01-localapps
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| 13:19 | But even when I fixed that, fish again made the client hang elsewhere
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| 13:19 | So, 3) troubleshoot more things that go wrong with fish, even after that line, and
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| 13:20 | 4) even if fish fails, it shouldn't login as root; which would be a test in X95-run-x-session
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| 13:20 | I'm not sure vagrantc will have time to work on all these, I certainly don't want to invest all that time to ltsp5, when ltsp19 is already more stable
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| 13:21 | So maybe (4) is enough, to fail but at least not allow root login
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| 13:21 | (btw I committed the fix for the 5.2 kernel this morning)
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| 13:21 | <uumas> I'd say the more important thing is to not login as root. Having some little used shells not work isn't that big of a problem
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| 13:22 | <alkisg> Indeed
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| 13:22 | <uumas> Yeah, it worked on 5.2 now
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| 13:22 | <alkisg> I'll write those to the bug report and let vagrant decide what to do with it
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| 13:22 | ty for the remote desktop
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| 13:22 | <uumas> No problem :D
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| 13:24 | <alkisg> ah
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| 13:24 | uumas, I just saw that I did some test wrong
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| 13:25 | Can we reconnect?
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| 13:27 | <uumas> Sorry, need to go for a while. Can probably try in 1-2 hours.
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| 13:27 | <alkisg> np
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| 13:27 | I'll comment that "maybe this will work" in the bug
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| 13:28 | Done
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| 15:45 | <alkisg> vagrantc, I commented on the bug report about the ldm bug
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| 15:45 | It's in X01-localapps; but we can ignore that part and just put the "test -n "$LDM_USERNAME" || die" thing
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| 15:46 | <vagrantc> saw it
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| 15:47 | should probably put it all over the place...
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| 15:47 | i mean, check anywhere it actually uses it
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| 15:47 | <alkisg> Maybe once after the "read -r" would be enough
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| 15:47 | <vagrantc> could pop up an error with ldm-dialog
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| 15:49 | alkisg: well, the same thing could happen somewhere else with another plugin
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| 15:49 | <alkisg> LDM_USERNAME is properly set; but X01-localapps destroys it if read fails
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| 15:49 | I don't think it can be empty elsewhere...
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| 15:50 | <vagrantc> in ltsp/ldm, maybe it doesn't, but someone else could implement the same type of error in some other hook
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| 15:51 | better to double-check in our code rather than assume it is set...
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| 15:52 | at least test -n "$LDM_USERNAME" wherever we call "su"
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| 15:53 | alkisg: thanks for finding the cause!
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| 16:03 | <alkisg> 👍
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| 16:09 | <uumas> alkisg: Do you still need to do testing? I'll be home in ~40min
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| 16:10 | <alkisg> uumas, if you want to use fish, i have a workaround that might work; if you don't care, I don't either :D
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| 16:10 | We will avoid the root thing, so np there
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| 16:11 | <uumas> Yeah, I'm switching to ltsp19 soon anyway and can just have `exec fish` in bashrc for now, so that won't be a problem.
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| 16:12 | <alkisg> ok
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| 16:20 | <vagrantc> does ltsp19 also have similar issues with non-bournish shells?
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| 16:21 | <alkisg> AFAIK no as I don't exec anything
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| 16:21 | I run `ssh exit` ):
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| 16:27 | <vagrantc> oh, i was just wondering why uumas would need to exec fish from bashrc
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| 16:28 | <alkisg> I think he means in ltsp5
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| 16:30 | <vagrantc> ah, "for now [with ltsp5]"
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| 16:31 | fish is a really nice shell
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| 16:32 | <alkisg> I didn't understand what they had against $() though, why they only support ()
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| 16:33 | vagrantc: did you say it fails with some other shell too?
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| 16:33 | Are there other shells that don't like $() ?
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| 16:35 | <vagrantc> according to wikipedia $ is only used for variable expansion in fish
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| 16:35 | alkisg: the csh varians
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| 16:35 | although i'm not sure that's *why* it fails
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| 16:37 | we should fork ltsp5 to only support fish.
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| 17:24 | <quinox> how incompatible are fish and bash when it comes to scripts?
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| 17:28 | it looks nice
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| 17:33 | <uumas> quinox: Incompatible for other than really, really basic stuff. I just write my scripts in bash even though I use fish as my main shell.
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| 17:33 | <quinox> okay
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| 17:36 | it seems like a really neat shell, that tab completion with man-page info looks superb
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| 17:49 | <mmarconm> MWALTERS: do u use shared folder mapped to user ?
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| 17:58 | <alkisg> vagrantc: I'm about to release ltsp 19.09 beta, and I was thinking to start using tags. Are you using the "lightweight" or the "annotated" ones?
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| 18:01 | I'm thinking: update changelog; git commit -am 'Version 19.09'; git tag -a v19.09 -m 'Version 19.09'
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| 18:08 | <vagrantc> i've always just used: git tag -s TAG
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| 18:08 | for signed
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| 18:08 | and it pops up an editor, so i can verify that i'm signing the right thing
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| 18:09 | e.g. "git commit -p && git tag -s TAG" ... because i like reviewing my changes
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| 18:09 | <alkisg> Nice, ty
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| 18:10 | <vagrantc> i guess because i use signed tags it implies git tag -a ?
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| 18:10 | <alkisg> No idea, first time reading about tags :D
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| 18:12 | <vagrantc> signed tags were a big motivation for me to switch to git
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| 18:13 | so i don't know if i've ever even use unsigned annotated tags
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