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  • Is there a way to create a copy-on-write copy of a directory?

    - by BCS
    I'm thinking of a situation where I would have something that creates a copy of a directory, tweaks a few files, and then does some processing on the result. This wold be done fairly often, maybe a few dozen times a day. (The exact use case is testing patch submissions; dupe the code, patch it, build/test/report/etc.) What I'm looking for could be done by creating a new directory structure and populating it with hard links from the origonal. However this only works if all the tools you use delete and recreate files rather than edit them in place. Is there a way to have the file system do copy-on-write for a file? Note: I'm aware that many FSs use COW at a block level (all updates are done via writes to new blocks) but this is not what I want.

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  • What's new in Puppet since 2007?

    - by BCS
    I've got a copy of the Pulling Strings with Puppet book (written in 2007) but given that it has a bunch of equivocal language, I'm wonder how much has changed since then? I've found this Release Notes page and a (short) summery table at the top of the language tutorial but neither have dates, so I don't know where to start (and the more detailed notes make for rather dry reading). Does anyone know of a page that list thing that have changed since that book was published?

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  • Do any of the HP printers have implement printer sharing?

    - by BCS
    I've seen several (home grade) HP prints that have network port and allow connecting to them via that. However I haven't seen any way to use it without installing the printer specific drives. This seems a bit silly because I've seen printer sharing system (SMB I think) that didn't seem to need any printer specific software. My question is: Is there a way to use one of these with my printers? (I'm omitting the exact model in the hopes that answers for several models (or a resource that answers it for several models) will be given.)

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  • Can OpenVPN be set up so the server doesn't have interface that is part of the VPN?

    - by BCS
    I'm looking to set up a VPN (OpenVPN is my first choice but I'm not stuck with it) in such a way that the server that hosts the VPN is not visible from within the VPN. That is; any packet that a client sends via the VPN interface will get delivered to another client's VPN interface or get dropped. In the other direction, the server shouldn't have a VPN interface at all and normal network operations shouldn't be able to send packets on the network. Can this be done? All the docs I have found have assumed that clients will connect via DHCP (this requiring that the server connect at least to that extent) but I can't think of any reason that a VPN couldn't use static IP's or that the DHCP server couldn't be implemented inside the VPN (see edit) server without setting up a VPN interface on the server. Edit: Based on the link on bridged mode from Phil Hollenback's answer it seems that OpenVPN does in fact have the "internal DHCP server" that I'm thinking of.

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  • why javamail fails with an authentication Exception ?

    - by saravana
    package com.bcs; import java.util.Properties; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; public class SendMailTLS { public static void main(String[] args) { String host = "smtp.gmail.com"; int port = 587; String username = "[email protected]"; String password = "bar"; Properties props = new Properties(); props.put("mail.smtp.auth", "true"); props.put("mail.smtp.starttls.enable", "true"); Session session = Session.getInstance(props); try { Message message = new MimeMessage(session); message.setFrom(new InternetAddress("")); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("")); message.setSubject("Testing Subject"); message.setText("Dear Mail Crawler," + "\n\n No spam to my email, please!"); Transport transport = session.getTransport("smtp"); transport.connect(host, port, username, password); Transport.send(message); System.out.println("Done"); } catch (MessagingException e) { throw new RuntimeException(e); } } } I have given all the necessary inputs . But still it fails with Exception in thread "main" java.lang.RuntimeException: javax.mail.AuthenticationFailedException: failed to connect, no password specified? at com.bcs.SendMailTLS.main(SendMailTLS.java:43) Caused by: javax.mail.AuthenticationFailedException: failed to connect, no password specified? at javax.mail.Service.connect(Service.java:329) at javax.mail.Service.connect(Service.java:176) at javax.mail.Service.connect(Service.java:125) at javax.mail.Transport.send0(Transport.java:194) at javax.mail.Transport.send(Transport.java:124) at com.bcs.SendMailTLS.main(SendMailTLS.java:38) I am new to java mail.Any help would be greatly appreciated.

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  • TechEd 2012: Office, SharePoint And More Office

    - by Tim Murphy
    I haven’t spent any time looking at Office 365 up to this point.  I met Donovan Follette on the flight down from Chicago.  I also got to spend some time discussing the product offerings with him at the TechExpo and that sealed my decision to attend this session. The main actor of his presentation is the BCS – Business Connectivity Services. He explained that while this feature has existed in on-site SharePoint it is a valuable new addition to Office 365 SharePoint Online.  If you aren’t familiar with the BCS, it allows you to leverage non-SharePoint enterprise data source from SharePoint.  The greatest benefactor is the end users who can leverage the data using a variety of Office products and more.  The one thing I haven’t shaken my skepticism of is the use of SharePoint Designer which Donovan used to create a WCF service.  It is mostly my tendency to try to create solutions that can be managed through the whole application life cycle.  It the past migrating through test environments has been near impossible with anything other than content created by SharePiont Designer. There is a lot of end user power here.  The biggest consideration I think you need to examine when reaching from you enterprise LOB data stores out to an online service and back is that you are going to take a performance hit.  This means that you have to be very aware of how you configure these integrated self serve solutions.  As a rule make sure you are using the right tool for the right situation. I appreciated that he showed both no code and code solutions for the consumer of the LOB data.  I came out of this session much better informed about the possibilities around this product. del.icio.us Tags: Office 365,SharePoint Online,TechEd,TechEd 2012

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  • SharePoint 2010 Video Training

    - by Sahil Malik
    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). Yes, the DVD is finally available. This is an exhaustive 14 hour video course that Carl and I recorded back in April. It is an end-to-end overview of SharePoint 2010. You can view more details including ordering information about the DVD here. And if you’re interested, a SharePoint 2007 video training version is also available. Carl and I worked quite hard on putting these together, so we hope you enjoy these. Detailed Table of Contents: Introduction (13:49) 30,000 Foot Overview (42:07) Application Management (43:35) User Experience (16:00) Writing Code Part 1 (1:07:49) Writing Code Part 2 (34:41) Simple Web Parts (14:01) Visual Web Parts (6:35) Pages (35:02) Putting it All Together (29:13) Client Side Technology (49:19) ADO.NET Data Services (51:29) Custom Data Services (43:30) Managing Data (29:02) Managing Data: Content Types (17:11) Managing Data: Events (19:22) Managing Data: List Scalability (35:51) Managing Data: Querying (20:07) Enterprise Content Management: DocumentIDs and Document Sets (16:44) Enterprise Content Management: Metadata Infrastructure (22:13) Enterprise Content Management: Record Management (26:27) Enterprise Content Management: Content Organizer (7:21) Enterprise Content Management: Enterprise Content Types (11:21) Business Connectivity Services (BCS) in the SharePoint Designer (26:09) BCS in Visual Studio (9:57) Workflows in the SharePoint Designer (22:07) Workflows in Visual Studio (19:01) Business Intelligence (21:14) Excel (15:25) Performance Point (24:37) Security: Claims-Based Authentication (27:13) Security: Secure Store Service (11:04) Security: The SharePoint Object Model (11:16) Comment on the article ....

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  • Find the "largest" dense sub matrix in a large sparse matrix

    - by BCS
    Given a large sparse matrix (say 10k+ by 1M+) I need to find a subset, not necessarily continuous, of the rows and columns that form a dense matrix (all non-zero elements). I want this sub matrix to be as large as possible (not the largest sum, but the largest number of elements) within some aspect ratio constraints. Are there any known exact or aproxamate solutions to this problem? A quick scan on Google seems to give a lot of close-but-not-exactly results. What terms should I be looking for? edit: Just to clarify; the sub matrix need not be continuous. In fact the row and column order is completely arbitrary so adjacency is completely irrelevant. A thought based on Chad Okere's idea Order the rows from largest count to smallest count (not necessary but might help perf) Select two rows that have a "large" overlap Add all other rows that won't reduce the overlap Record that set Add whatever row reduces the overlap by the least Repeat at #3 until the result gets to small Start over at #2 with a different starting pair Continue until you decide the result is good enough

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  • Is the valid state domain of a program a regular language?

    - by BCS
    If you look at the call stack of a program and treat each return pointer as a token, what kind of automata is needed to build a recognizer for the valid states of the program? As a corollary, what kind of automata is needed to build a recognizer for a specific bug state? My thought is that if these form regular languages than some interesting tools could be built around that. E.g. given a set of crash/failure dumps, automatically group them and generate a recognizer to identify new instances of know bugs.

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  • SQL join: where clause vs. on clause

    - by BCS
    After reading it, this is not a duplicate of Explicit vs Implicit SQL Joins. The answer may be related (or even the same) but the question is different. What is the difference and what should go in each? If I understand the theory correctly, the query optimizer should be able to use both interchangeably.

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  • HTML/JavaScript compation for security.

    - by BCS
    I just ran across this point that references a security vulnerability in Web Apps that depends on looking at the size of encrypted web pages to deduce what the uses is doing. The simplest solution to this I can think of would be to use a tool to minify all static content so that (after encryption) only a small number of result sizes exist so as to minimize the information available to an eavesdropper. Are there any tools for doing this?

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  • Generalized plugable caching pattern?

    - by BCS
    Given that it's one of the hard things in computer science, does anyone know of a way to set up a plugable caching strategy? What I'm thinking of would allow me to write a program with minimal thought as to what needs to be cached (e.i. use some sort of boiler-plate, low/no cost pattern that compiles away to nothing anywhere I might want caching) and then when things are further along and I know where I need caching I can add it in without making invasive code changes. As an idea to the kind of solution I'm looking for; I'm working with the D programing language (but halfway sane C++ would be fine) and I like template.

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  • How big is too big (for NTFS)

    - by BCS
    I have a program and as it's done now, it has a data directory with something like 10-30K files in it and it's starting to cause problems. Should I expect that to cause problems and my only solution to tweak my file structure or does that indicate other problems?

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  • Will the compiler optimize escaping an inner loop?

    - by BCS
    The code I have looks like this (all uses of done shown): bool done = false; for(int i = 0; i < big; i++) { ... for(int j = 0; j < wow; j++) { ... if(foo(i,j)) { done = true; break; } ... } if(done) break; ... } will any compilers convert it to this: for(int i = 0; i < big; i++) { ... for(int j = 0; j < wow; j++) { ... if(foo(i,j)) goto __done; // same as a labeled break if we had it ... } ... } __done:;

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  • Eclipse Python Integration

    - by BCS
    I found this python plugin list but thought I'd ask if anyone has any experience with anything listed there? I'm totally new to both python and dynamic programming languages if that makes any difference.

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  • machine learning and code generator from strings

    - by BCS
    The problem: Given a set of hand categorized strings (or a set of ordered vectors of strings) generate a decision function to categorize more input. The question: are there any tools out there that will do that? I'm thinking of some kind of reasonably polished, download, install and go kind of things, as opposed to to some library or a brittle academic program.

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  • ASP.NET calendar drawing control

    - by BCS
    I want to make a simple ASP.NET page that draws a months from a calendar and highlights given dates. (I'm not looking for a date picker.) What I have is a list of DateTime values and I need to display them a a nice way. Given that I'm a total beginner with ASP, simpler really is better. (I'd rather not, I'm willing to hack together something with StringBuilder and <table> if it's easier). p.s. I have no budget, so non-free controls will only be of use to other readers.

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  • How few a files does it take to load a program on Linux?

    - by BCS
    The (hypothetical for now) situation is the user of my system is going to be given a chunk of C code and needs my system to compile and run it in a chroot sandbox that is generated on the fly and I want to require the fewest files in the box as possible. I'm only willing to play with compiler and linker settings (e.g. static link everything I can expect to be able to find) and make some moderate restriction on what the code can expect use (e.g. they can't use arbitrary libs). The question is how simple can I get the sandbox. Clearly I need the executable, but what about an ELF loader and a .so for the system calls? Can I dump either of them and is there something else I'll need?

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  • How to extract the lat/lng of pins in google maps?

    - by BCS
    I want to extract the latitude and longitude of a set of about 50-100 pins in a Google maps web page. I don't control the page and I don't need to do it more than once so I'm looking for something quick and dirty. I've got FireFox with FireBug as well as Chrome and all I need is something that's easier than re typing all the numbers.

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  • Given a document select a relevant snippet.

    - by BCS
    When I ask a question here, the tool tips for the question returned by the auto search given the first little bit of the question, but a decent percentage of them don't give any text that is any more useful for understanding the question than the title. Does anyone have an idea about how to make a filter to trim out useless bits of a question? My first idea is to trim any leading sentences that contain only words in some list (for instance, stop words, plus words from the title, plus words from the SO corpus that have very weak correlation with tags, that is that are equally likely to occur in any question regardless of it's tags)

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  • how to get reply from jQuery.get request

    - by BCS
    I have a page that uses the following to submit a AJAX request: function oc() { jQuery.get( "http://somewhere.com:5001/ajax/options/", jQuery('#selectform').serialize(), function(data,statusm,xml){ // I got nothing!!! return; } ); } If I make the request manual from the address bar, things work. And when I make the request from the JS I can see via logging that the server side is working correctly, but in the call back, I can't seem to get the contents of the reply. What am I going wrong?

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  • Check if a symlink has changed

    - by BCS
    I have a daemon that, when it's started, loads its data from a directory that happens to be a symlink. Periodically, new data is generated and the symlink updated. I want a bash script that will check if the current symlink is the same as the old one (that the daemon started with) and if not, restart the daemon. My current thought is: if [[ ! -e $old_dir || $(readlink "$data_dir") == $(readlink "$old_dir") ]]; then echo restart ... ln "$(readlink "$data_dir")" "$old_dir" -sf else echo no restart fi The abstract requirement is: each time the script runs, it needs to check if a symlink on a given path now points to a something other than it did the last time and if so do something. (The alternative would be to check if the data at the path has changed but I don't see that being any cleaner.) My questions: Is this a good approach? Does anyone have a better idea? Where should I put $old_dir?

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  • Is it legal for a C++ reference to be NULL?

    - by BCS
    A while back I ran into a bug the looked something like this: void fn(int &i) { printf(&i == NULL ? "NULL\n" : "!NULL\n"); } int main() { int i; int *ip = NULL; fn(i); // prints !NULL fn(*ip); // prints NULL return 0; } More recently, I ran into this comment about C++ references: [References arguments make] it clear, unlike with pointers, that NULL is not a possible value. But, as show above, NULL is a possible value. So where is the error? In the language spec? (Unlikely.) Is the compiler in error for allowing that? Is that coding guide in error (or a little ambiguous)? Or am I just wandering into the minefield known as undefined behavior?

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  • Correct to check for a command line flag in bash

    - by BCS
    In the middle of a scrip, I want to check if a given flag was passed on the command line. The following does what I want but seems ugly: if echo $* | grep -e "--flag" -q then echo ">>>> Running with flag" else echo ">>>> Running without flag" fi Is there a better way? Note: I explicitly don't want to list all the flags in a switch/getopt. (And BTW the bodies of the if just set a set of vars)

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