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  • rsync --link-dest behaviour when run as sudo

    - by fotNelton
    In order to create regular backups, I'm using rsync together with --link-dest so as to create hard-links for unchanged files. For example: rsync -ax \ --partial --delete --delete-excluded --inplace \ --exclude-from=/tmp/temp_excludes \ --link-dest=/Volumes/Backup/current \ /Users /Volumes/Backup/2012-06-25 This works very well as long as I start the process from my normal user account. Though as soon as I start the process using sudo it behaves erradically, meaning that rsync copies all the unchanged files instead of hard-linking them. Since sudo modifies the environment, I've already also tried sudo -E in conjunction with making sure that my sudoers file has the corresponding option set. Well, that didn't work either. So, the question is, how can I run rsync using sudo? Whereas the above example only shows a backup of the Users directory, I also need to backup some system files that I can only access as root.

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  • Strange zsh autocomplete behaviour.

    - by Leda
    Every time I use tab autocompletion with zsh instead of completing the current string, it gives me a new string + options to complete. It's hard to explane, so here is an example. This is what would happen if I type 'ls Nue' and hit tab. [me@mbp:/Volumes/hdd/music]: ls Neu ls Neu Neuraxis/ Neurosis/ Neutral\ Milk\ Hotel/ If I delete the second `ls Nue', I am unable to delete the white space and the first. If I hit return, it is as if I have just entered a blank line. Does anyone know what is going on.

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  • Strange Behaviour with Unicode Characters in Windows

    - by open_sourse
    Ok, I do not know if this is a programming question, but it certainly is a technical one so I am asking it here. I was working on some internationalization stuff in my PHP code, and in order to ensure that my generated HTML shows up Unicode correctly based on the encoding and stuff I decided to add some Chinese text to my PHP page, which then echoes it into the browser to complete my test case. So I went into google and typed "Chinese", copied the first Chinese text that the search returned (which was ??/??). I then copied it into Notepad++ which is my editor, and to my surprise showed up as boxes similar to [][]/[][]. So I thought the encoding in Notepad++ was messed up and I changed the encoding to UTF-8 and UCS, neither worked. I did it fresh in a newly encoded file, still I got the boxes. The same content when I paste into Google and StackOverFlow (like I did in this posting) shows up correct Chinese! I even opened up Windows Clipboard Viewer and the content is represented in the Clipboard as boxes! I tried pasting it into Windows Explorer address bar and using to rename a file to, but I still get boxes. But it shows up correctly when pasted into my Chrome Browser address bar! Is this a Windows issue? Since I am able to paste it correctly in SO, the data in memory should be encoded correctly right? But if that is the case why does it show up as boxes in the Clipboard Viewer? I am confused here...By the way I am using Windows XP with SP3. (I am asking this question here, even if it is not programmatic, because it is preventing me from running my programming test cases..)

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  • Different behaviour when running exe from command prompt than in windows

    - by valoukh
    Forgive me if I'm not using the correct terminology here but I'll try to explain the issue I'm having as best I can! We use a program that allows you to view video footage from several cameras, and it works in such a way that when it is opened it then automatically loads several video files within its interface. These video files are stored in a subfolder, e.g. "videos\video1.asf", etc. I didn't create the program so I can't say what method it uses to open the files. The files are stored on a network server and are being accessed via a share/UNC path. When the file is run from windows explorer (by navigating to the network share and double-clicking the exe), it works perfectly. When the file is run via the (elevated) command prompt (e.g. by typing the \server\path\to\file.exe) it opens, but the corresponding video files do not load. I am trying to create a script that launches the program via the command prompt, so the first step is finding out why the two actions above have different consequences. Any advice on how running executables from the command prompt could produce a different result would be greatly appreciated. Thanks

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  • Different behaviour of script locally and over ssh

    - by neorg
    I have a script on a server-A Script-A #!/bin/bash -l echo "script-A.sh" | change-environment.sh When I ssh onto server-A and execute it, it works fine. However, when I ssh user@server-A ./script-A.sh Script-A executes, but throws an undefined variable error in change-environment.sh. change-environment.sh runs in the c shell(I have no control over the script so the method I have used is about the only way I can use it), but everything else is in bash. Had found a similar question at I can run a script locally, but cannot do "ssh HOSTNAME /path/to/script.sh". However, there was no solution to the issue and it was a year old.

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  • Skype behaviour in the Windows 7 Superbar

    - by Rogue
    The new version of Skype is always stuck on my Super-Bar(unless i exit the program), which is really annoying. There is not option to minimize it to the tray at least in Skype options. Has anyone had this problem and figured out how to minimize it to the tray?

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  • Odd tcp deadlock under windows

    - by John Robertson
    We are moving large amounts of data on a LAN and it has to happen very rapidly and reliably. Currently we use windows TCP as implemented in C++. Using large (synchronous) sends moves the data much faster than a bunch of smaller (synchronous) sends but will frequently deadlock for large gaps of time (.15 seconds) causing the overall transfer rate to plummet. This deadlock happens in very particular circumstances which makes me believe it should be preventable altogether. More importantly if we don't really know the cause we don't really know it won't happen some time with smaller sends anyway. Can anyone explain this deadlock? Deadlock description (OK, zombie-locked, it isn't dead, but for .15 or so seconds it stops, then starts again) The receiving side sends an ACK. The sending side sends a packet containing the end of a message (push flag is set) The call to socket.recv takes about .15 seconds(!) to return About the time the call returns an ACK is sent by the receiving side The the next packet from the sender is finally sent (why is it waiting? the tcp window is plenty big) The odd thing about (3) is that typically that call doesn't take much time at all and receives exactly the same amount of data. On a 2Ghz machine that's 300 million instructions worth of time. I am assuming the call doesn't (heaven forbid) wait for the received data to be acked before it returns, so the ack must be waiting for the call to return, or both must be delayed by something else. The problem NEVER happens when there is a second packet of data (part of the same message) arriving between 1 and 2. That part very clearly makes it sound like it has to do with the fact that windows TCP will not send back a no-data ACK until either a second packet arrives or a 200ms timer expires. However the delay is less than 200 ms (its more like 150 ms). The third unseemly character (and to my mind the real culprit) is (5). Send is definitely being called well before that .15 seconds is up, but the data NEVER hits the wire before that ack returns. That is the most bizarre part of this deadlock to me. Its not a tcp blockage because the TCP window is plenty big since we set SO_RCVBUF to something like 500*1460 (which is still under a meg). The data is coming in very fast (basically there is a loop spinning out data via send) so the buffer should fill almost immediately. According to msdn the buffer being full and at least one pending send should cause the data to be sent (though in another place it mentions that there various "heuristics" used in deciding when a send hits the wire). Anway, why the sender doesn't actually send more data during that .15 second pause is the most bizarre part to me. The information above was captured on the receiving side via wireshark (except of course the socket.recv return times which were logged in a text file). We tried changing the send buffer to zero and turning off Nagle on the sender (yes, I know Nagle is about not sending small packets - but we tried turning Nagle off in case that was part of the unstated "heuristics" affecting whether the message would be posted to the wire. Technically microsoft's Nagle is that a small packet isn't sent if the buffer is full and there is an outstanding ACK, so it seemed like a possibility).

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  • Odd C++ template behaviour with static member vars

    - by jon hanson
    This piece of code is supposed to calculate an approximation to e (i.e. the mathematical constant ~ 2.71828183) at compile-time, using the following approach; e1 = 2 / 1 e2 = (2 * 2 + 1) / (2 * 1) = 5 / 2 = 2.5 e3 = (3 * 5 + 1) / (3 * 2) = 16 / 6 ~ 2.67 e4 = (4 * 16 + 1) / (4 * 6) = 65 / 24 ~ 2.708 ... e(i) = (e(i-1).numer * i + 1) / (e(i-1).denom * i) The computation is returned via the result static member however, after 2 iterations it yields zero instead of the expected value. I've added a static member function f() to compute the same value and that doesn't exhibit the same problem. #include <iostream> #include <iomanip> // Recursive case. template<int ITERS, int NUMERATOR = 2, int DENOMINATOR = 1, int I = 2> struct CalcE { static const double result; static double f () {return CalcE<ITERS, NUMERATOR * I + 1, DENOMINATOR * I, I + 1>::f ();} }; template<int ITERS, int NUMERATOR, int DENOMINATOR, int I> const double CalcE<ITERS, NUMERATOR, DENOMINATOR, I>::result = CalcE<ITERS, NUMERATOR * I + 1, DENOMINATOR * I, I + 1>::result; // Base case. template<int ITERS, int NUMERATOR, int DENOMINATOR> struct CalcE<ITERS, NUMERATOR, DENOMINATOR, ITERS> { static const double result; static double f () {return result;} }; template<int ITERS, int NUMERATOR, int DENOMINATOR> const double CalcE<ITERS, NUMERATOR, DENOMINATOR, ITERS>::result = static_cast<double>(NUMERATOR) / DENOMINATOR; // Test it. int main (int argc, char* argv[]) { std::cout << std::setprecision (8); std::cout << "e2 ~ " << CalcE<2>::result << std::endl; std::cout << "e3 ~ " << CalcE<3>::result << std::endl; std::cout << "e4 ~ " << CalcE<4>::result << std::endl; std::cout << "e5 ~ " << CalcE<5>::result << std::endl; std::cout << std::endl; std::cout << "e2 ~ " << CalcE<2>::f () << std::endl; std::cout << "e3 ~ " << CalcE<3>::f () << std::endl; std::cout << "e4 ~ " << CalcE<4>::f () << std::endl; std::cout << "e5 ~ " << CalcE<5>::f () << std::endl; return 0; } I've tested this with VS 2008 and VS 2010, and get the same results in each case: e2 ~ 2 e3 ~ 2.5 e4 ~ 0 e5 ~ 0 e2 ~ 2 e3 ~ 2.5 e4 ~ 2.6666667 e5 ~ 2.7083333 Why does result not yield the expected values whereas f() does? According to Rotsor's comment below, this does work with GCC, so I guess the question is, am i relying on some type of undefined behaviour with regards to static initialisation order, or is this a bug with Visual Studio?

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  • NHibernate, and odd "Session is Closed!" errors

    - by Sekhat
    Note: Now that I've typed this out, I have to apologize for the super long question, however, I think all the code and information presented here is in some way relevant. Okay, I'm getting odd "Session Is Closed" errors, at random points in my ASP.NET webforms application. Today, however, it's finally happening in the same place over and over again. I am near certain that nothing is disposing or closing the session in my code, as the bits of code that use are well contained away from all other code as you'll see below. I'm also using ninject as my IOC, which may / may not be important. Okay, so, First my SessionFactoryProvider and SessionProvider classes: SessionFactoryProvider public class SessionFactoryProvider : IDisposable { ISessionFactory sessionFactory; public ISessionFactory GetSessionFactory() { if (sessionFactory == null) sessionFactory = Fluently.Configure() .Database( MsSqlConfiguration.MsSql2005.ConnectionString(p => p.FromConnectionStringWithKey("QoiSqlConnection"))) .Mappings(m => m.FluentMappings.AddFromAssemblyOf<JobMapping>()) .BuildSessionFactory(); return sessionFactory; } public void Dispose() { if (sessionFactory != null) sessionFactory.Dispose(); } } SessionProvider public class SessionProvider : IDisposable { ISessionFactory sessionFactory; ISession session; public SessionProvider(SessionFactoryProvider sessionFactoryProvider) { this.sessionFactory = sessionFactoryProvider.GetSessionFactory(); } public ISession GetCurrentSession() { if (session == null) session = sessionFactory.OpenSession(); return session; } public void Dispose() { if (session != null) { session.Dispose(); } } } These two classes are wired up with Ninject as so: NHibernateModule public class NHibernateModule : StandardModule { public override void Load() { Bind<SessionFactoryProvider>().ToSelf().Using<SingletonBehavior>(); Bind<SessionProvider>().ToSelf().Using<OnePerRequestBehavior>(); } } and as far as I can tell work as expected. Now my BaseDao<T> class: BaseDao public class BaseDao<T> : IDao<T> where T : EntityBase { private SessionProvider sessionManager; protected ISession session { get { return sessionManager.GetCurrentSession(); } } public BaseDao(SessionProvider sessionManager) { this.sessionManager = sessionManager; } public T GetBy(int id) { return session.Get<T>(id); } public void Save(T item) { using (var transaction = session.BeginTransaction()) { session.SaveOrUpdate(item); transaction.Commit(); } } public void Delete(T item) { using (var transaction = session.BeginTransaction()) { session.Delete(item); transaction.Commit(); } } public IList<T> GetAll() { return session.CreateCriteria<T>().List<T>(); } public IQueryable<T> Query() { return session.Linq<T>(); } } Which is bound in Ninject like so: DaoModule public class DaoModule : StandardModule { public override void Load() { Bind(typeof(IDao<>)).To(typeof(BaseDao<>)) .Using<OnePerRequestBehavior>(); } } Now the web request that is causing this is when I'm saving an object, it didn't occur till I made some model changes today, however the changes to my model has not changed the data access code in anyway. Though it changed a few NHibernate mappings (I can post these too if anyone is interested) From as far as I can tell, BaseDao<SomeClass>.Get is called then BaseDao<SomeOtherClass>.Get is called then BaseDao<TypeImTryingToSave>.Save is called. it's the third call at the line in Save() using (var transaction = session.BeginTransaction()) that fails with "Session is Closed!" or rather the exception: Session is closed! Object name: 'ISession'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.ObjectDisposedException: Session is closed! Object name: 'ISession'. And indeed following through on the Debugger shows the third time the session is requested from the SessionProvider it is indeed closed and not connected. I have verified that Dispose on my SessionFactoryProvider and on my SessionProvider are called at the end of the request and not before the Save call is made on my Dao. So now I'm a little stuck. A few things pop to mind. Am I doing anything obviously wrong? Does NHibernate ever close sessions without me asking to? Any workarounds or ideas on what I might do? Thanks in advance

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  • Odd problem with IE8 and z-index CSS property

    - by DK39
    I not been able to put one DIV over his parent DIV in Internet Explorer. With Firefox is working as suposed to. The odd part is that if I open the html file directly in IE, everything works fine. But if I upload to the server and open from there, the div is hidden underneath his parent. I've tried several z-index combinations and none works. Here's the code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>Test</title> <meta http-equiv="content-type" content="text-html; charset=utf-8" /> <style type="text/css"> .col { float:left; width:310px; margin-right:13px; } .art { position:relative; border-bottom: 1px solid #d0d0d0; font: normal normal bold 11px Arial,Verdana,Helvetica; color:#A0A0A0; width:310px; height:50px; top:0px; left: 0px; margin-right:10px; background-color:#F0F0F0; } .art a { padding:3px; display:block; width:304px; height:100%; color:#707070; } .art a:visited { color:#A0A0A0; } .art a:hover { background-color:#E0E0E0; } .box { z-index:1000; background-color:#A0A0A0; color:#404040; font: normal normal bold 11px Arial,Verdana,Helvetica; display:none; position:absolute; top:30px; left:10px; text-align:left; border:3px solid #707070; margin:5px 0px 5px 5px; font-size:10px; color:White; width:100%; } </style> <script type="text/javascript"> function sh(obj) { var el = document.getElementById(obj); if ( el.style.display != 'block' ) { el.style.display = 'block'; } else { el.style.display = 'none'; } } </script> </head> <body> <div class="col"> <div class="art"> <a href="" target="_blank" onmouseover="javascript:sh('i0')" onmouseout="javascript:sh('i0')">Title 1</a> <div id="i0" class="box"> <div class="text"> Les "chemises rouges" manifestent depuis la mi-mars pour faire tomber le gouvernement et occupent depuis trois semaines un quartier touristique et commerçant autour duquel ils ont érigé des barricades. </div> </div> </div> <div class="art"> <a href="" target="_blank" onmouseover="javascript:sh('i1')" onmouseout="javascript:sh('i1')">Title2</a> <div id="i1" class="box"> <div class="text"> Une association ardéchoise accueillant des séminaires de "bien-être" et de "développement personnel" a refusé d'accueillir un stage de danse en invoquant l'homosexualité des participants, ont indiqué aujourd'hui les organisateurs. </div> </div> </div> </div> </body> </html> What's is going on here?

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  • Weird behaviour in Drag drop

    - by Prasanth
    Im using drag drop to treeView items in a tree in a WPF application. There is some unexpected behaviour when I drag a node from the bottom edge and drag it to some other node. The node that I drag is not getting moved, but the node immediately below it is. Please let me know if you have any thoughts on this or experienced this before. Thanks in advance

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  • Simple javascript to mimic jQuery behaviour of using this in events handlers

    - by Marco Demaio
    This is not a question about jQuery, but about how jQuery implements such a behaviour. In jQuery you can do this: $('#some_link_id').click(function() { alert(this.tagName); //displays 'A' }) could someone explain in general terms (no need you to write code) how do they obtain to pass the event's caller html elments (a link in this specific example) into the this keyword? I obviously tried to look 1st in jQuery code, but I could not understand one line. Thanks!

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  • strange behaviour of git

    - by Alexey Poimtsev
    Hi, i have strange behaviour of git - push is working, but clone is not :( alec$ git clone git://host/repo.git Initialized empty Git repository in /Users/alec/Temp/repo/.git/ host[0: x.x.x.x]: errno=Connection refused fatal: unable to connect a socket (Connection refused) whats wrong?

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  • UITablevViewCellStyle strange behaviour with detailTextLabel

    - by joec
    I have set my UITableViewCellStyle to be Value2, and it shows the detailTextLabel and textLabel, but instead of the detailTextLabel being the small text to the left of the cell, it is now the primary text in the cell, and the textLabel is the small text. Strange behaviour and i'm not sure why? For now i'm just swapping the values over, but I'm pretty sure its not correct. Anyone else experienced this issue? Thanks

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  • Weird behaviour of Calendar and DateFormat

    - by Nejc
    I encountered really strange behaviour when constructing a Calendar object and then formating it in a particular style. Let the code do the talking: public class Test { public static void main(String[] args) { SimpleDateFormat frmt = new SimpleDateFormat(); frmt.applyPattern("yyyy-MM-dd"); GregorianCalendar date = new GregorianCalendar(2012,1,1); System.out.println(frmt.format(date.getTime())); } } The output is: 2012-02-01 The expected output is of course: 2012-01-01 What am I doing wrong?

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  • Why is this undefined behaviour?

    - by xryl669
    Here's the sample code: X * makeX(int index) { return new X(index); } struct Tmp { mutable int count; Tmp() : count(0) {} const X ** getX() const { static const X* x[] = { makeX(count++), makeX(count++) }; return x; } }; This reports Undefined Behaviour on CLang version 500 in the static array construction. For sake of simplication for this post, the count is not static, but it does not change anything.

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  • Qt - controlling drag behaviour

    - by bullettime
    Suppose I want my draggable widget to move differently than just staying under my cursor while being dragged. For instance, having the widget move only in one axis, or have the widget move double the distance between the cursor and the drag starting point. Which method should I override to define this kind of behaviour?

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  • WCF Message Debugging on WebHttpBehavior

    - by Programming Hero
    I've created a custom binding in WCF for a custom MessageEncoder to allow messages to be written as XML using a wider range of encodings than WCF supports out of the box. The encoder appears to be working and I am able to send and receive messages, but I want to verify that the XML message being written is exactly as required by the service I am trying to consume. I've turned on message logging for WCF using the diagnostic trace listeners to output the messages sent and received over the wire to a log file. Unfortunately, for calls using my encoder, the message is displayed as ... stream ... EDIT: I don't think it's anything to do with my custom encoding. I have experimented with my custom binding a little, switching to using the built-in text encoding and http transport. I still don't get a message body logged in the message trace. EDIT2: Having done further investigation, the issue looks to be related not to the custom binding, but the custom behaviour. I'm apply the <webHttp/> behaviour. Once this is specified (along with manual addressing), the tracing behaviour shows up. Is this a known issue with WebHttpBehavior? Am I still barking up the wrong tree?

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  • WPF DataGrid : CanContentScroll property causing odd behavior

    - by Sonic Soul
    i have a solution where i generate a DataGrid (or multiple instances) based on user criteria.. each grid keeps receiving data as it comes in via ObservableCollection the problem i had, was that the scroll acted weird. It was choppy, and scrollbar would resize it self while scrolling. than i found.. CanContentScroll property! It completely fixes the weird scrolling behavior bringing me temporary bliss and happiness. however, it causes 2 unfortunate side effects. whenever i re-create grid instances and bind them to my observable collection, it freezes my entire window for 5 seconds. when my grid grows to a big size, this delay can last for 30 seconds. when i call TradeGrid.ScrollIntoView(TradeGrid.Items(TradeGrid.Items.Count - 1)) to scroll to the bottom, it jumps to bottom and than back to the top. is there another way to achieve smooth scrolling perhaps?

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  • Odd Infragistics UltraComboEditor data binding non-bug

    - by Richard Dunlap
    Within an Infragistics 8.2 UltraComboEditor, we had the following properties set via C#: DataSource = dataSource; ValueMember = "Measure"; DisplayMember = "Name"; DataBindings.Add("Value", repository, "Measure"); DataBindings["Value"].DataSourceUpdateMode = DataSourceUpdateMode.OnPropertyChanged; where dataSource was an array of objects, each with a property Measure, and repository was an object with a property Measure. (Those strings are actually constructor parameters -- just using explicit strings to simplify the example.) In the course of some refactoring, the name of the property on the objects in the array was changed to BaseEnum (the objects are actually wrapped enumerations, for the curious), but the name of ValueMember above was not changed. And yet, the combo box binding continued to work through initial testing, beta testing, and even after release... until two customers emailed in noting that the combo box was no longer changing the underlying parameter. We were able to dig out the problem by careful study of the source code repository... despite being in the awkward position of not being able to replicate the buggy behavior internally. Two part question: What's happening under the hood that allowed the binding to continue to function, and/or what might be unique about those two users that caused the binding to (correctly) fail? (O/S version isn't alone the answer, and we get the unexpectedly functioning binding on machines that have never had a version of the software before, so we're not looking at rogue binaries). Are there tools that might have been able to warn us about the misbind, even if something was cleaning up behind?

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