From: Ian Jackson <Ian.Jackson@eu.citrix.com> To: Razvan Cojocaru <firstname.lastname@example.org> Cc: email@example.com, firstname.lastname@example.org, email@example.com Subject: Re: [PATCH V2] tools/xenstore-watch: Add new timeout parameter Date: Thu, 17 Mar 2016 16:39:19 +0000 [thread overview] Message-ID: <firstname.lastname@example.org> (raw) In-Reply-To: <email@example.com> Razvan Cojocaru writes ("[PATCH V2] tools/xenstore-watch: Add new timeout parameter"): > This patch allows xenstore-watch to exit even if no changes to its > XenStore key have occured in a specified interval (in seconds), via > a new -T parameter. I realise I come a bit late with this, but: I'm not opposed to making it possible to wait with a timeout for a suitable situation in xenstore. However, xenstore-watch needs to be run in a loop because of the possibility of spurious watch triggers. And this means that to use your new option and get the timeout right, the caller would need to write shell code to query the time, do arithmetic to calculate the appropriate timeout, and so on. Or to put it another way, xenstore-watch is a fine debugging and monitoring tool but not very good for scripting. For scripting what you probably want is something like: "wait up to T seconds for xenstore node /X/Y/Z to contain something matching PAT; bail immediately if /X/Y/Z contains something matching QAT". How are you using this new option ? Ian. _______________________________________________ Xen-devel mailing list Xenfirstname.lastname@example.org http://lists.xen.org/xen-devel
next prev parent reply other threads:[~2016-03-17 16:39 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-03-17 8:55 Razvan Cojocaru 2016-03-17 16:39 ` Ian Jackson [this message] 2016-03-17 16:46 ` Razvan Cojocaru
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