[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-API] strange bug with xe and bash
Hi, Looking back through the code history it seems that xe is saving and restoring console state as a workaround for a bug where a subprocess was inheriting the terminal, failing and leaving it in a bad state. We've tidied up our subprocess handling since then and I can no longer reproduce the original problem (the original report was from 2007) Therefore I've removed this workaround from xe - see xen-api pull request 334. Assuming the change builds and passes basic tests, i'll merge to master. With this change "xe vm-list | less" works as I would expect. Perhaps in the future we should make "xe" behave like "git" -- I like the way it detects that it's running on a terminal and runs the output through your configured pager. Cheers, -- Dave Scott On Sep 3, 2011, at 1:48 PM, "Mike McClurg" <mike.mcclurg@xxxxxxxxxx> wrote: > On 08/24/2011 09:16 AM, George Shuklin wrote: >> Good day. >> >> Found incredibly strange and amazing bug. >> >> If this command issued: >> >> echo $(xe host-list name-label=$(hostname) ) | cat >> >> bash displays: [1]+ Stopped >> >> I don't press Ctrl-Z, it happens by itself. >> >> This works in bash, don't work in csh. This happens irregularly (2-3 >> times going background, 1-2 times not). >> >> You can replace 'hostname' and 'cat' with any other commands - only xe >> in middle does matter. If 'hostname' replaced by text bug not appear. >> >> I could not say I really it bother me, but it really strange. What >> happens? >> > > Yes, I've noticed this too. This has to do with the way that xe is > grabbing the terminal. You may have also noticed this same problem when > you pipe xe output to less. When you pipe to less, you have to hit enter > after every keypress, instead of less recognising keypreses as they occur. > > You can work around this by doing something like this: 'cat /dev/null | > xe <command> | less'. > > Mike > > _______________________________________________ > xen-api mailing list > xen-api@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/mailman/listinfo/xen-api _______________________________________________ xen-api mailing list xen-api@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/mailman/listinfo/xen-api
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