On 07.03.2018 16:05, Mark Reynolds wrote:
> Hello,
>
> So I am running into two issues with file watching on cockpit-151-2
>
> [1] The first one appears to be a permissions issue. So I am trying to
> watch a file that the Cockpit user does have immediate permissions to,
> but the Cockpit user does have sudo rights. When I try to watch the
> file, I get an error: "Not permitted to perform this action." - I'm
> assuming it's permissions issue because if I watch a file in /tmp it
> works fine (I also tried disabling selinux but no luck).
>
> My code:
>
> var logfile =
> cockpit.file("/var/log/dirsrv/slapd-localhost/errors");
> //var logfile = cockpit.file("/tmp/errors");
> errorslog_watch = logfile.watch(function (content, tag, error) {
> $('#errorslog-area').text(content);
> console.log("We should have logged something: (" + content +
> ") err: " + error);
> });
>
> This generates in console:
>
> We should have logged something: (null) err: Not permitted to
> perform this action.
>
> I'm not 100% sure what that errors means, but is there something what
> will invoke sudo on the file access/watching?
I think you want something like:
var logfile = cockpit.file("/tmp/errors", { "superuser": true });
> [2] What I want to do is the equivalent of "tailing" a log file, and I
> would like to use Cockpit's file watching functionality to do this.
> However, when the log file changes the entire file content is returned.
> Our log files can grow up to 100mb. Is there a way to only return the
> last N lines of a file when it changes without loading the entire
> content into memory?
I'd suggest just running the "tail" command:
var proc = cockpit.spawn(["tail", "-f", "/tmp/errors"], { "superuser":
true });
And then using proc.stream() to get the data.
Hope that helps,
Stef
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