Documentation at Mercurial wiki says following about bare repositories:

&gt; &quot;*Although this is a minor issue, Mercurial can obviously handle a
&gt; bare repository; that is, a repository without a working copy. In Git
&gt; you need a configuration option for that, whereas in Hg you only need
&gt; to check out the null revision, like this:*&quot;


&gt;     hg update null

The null revision is similar to the empty state you have when you have just done `hg init`. It is the parent of revision 0 (and the second parent of all non-merge revisions) and by updating back to it you again get an empty working copy.

The link may look ironic:

 - https://www.mercurial-scm.org/wiki/GitConcepts

    rm -rf *

This removes all &quot;visible&quot; files (under *nix). Since the Mercurial repository is stored in the &quot;hidden&quot; file `.hg`, it won&#39;t be touched. Unfortunately, neither will any hidden files of your own, such as `.hgignore`.

To restore the working copy, I&#39;m sure there&#39;s an `hg update` flag that works, but this will as well:

    hg revert --all

I have been a high-level coder, and architectures are pretty new to me, so I decided to read the tutorial on Assembly here: 

http://en.wikibooks.org/wiki/X86_Assembly/Print_Version

Far down the tutorial, instructions on how to convert the Hello World! program 

    #include &lt;stdio.h&gt;
    
    int main(void) {
        printf(&quot;Hello, world!\n&quot;);
        return 0;
    }

into equivalent assembly code was given and the following was generated:

            .text
    LC0:
            .ascii &quot;Hello, world!\12\0&quot;
    .globl _main
    _main:
            pushl   %ebp
            movl    %esp, %ebp
            subl    $8, %esp
            andl    $-16, %esp
            movl    $0, %eax
            movl    %eax, -4(%ebp)
            movl    -4(%ebp), %eax
            call    __alloca
            call    ___main
            movl    $LC0, (%esp)
            call    _printf
            movl    $0, %eax
            leave
            ret

For one of the lines,

    andl    $-16, %esp

the explanation was:

&gt; This code &quot;and&quot;s ESP with 0xFFFFFFF0,
&gt; aligning the stack with the next
&gt; lowest 16-byte boundary. An
&gt; examination of Mingw&#39;s source code
&gt; reveals that this may be for SIMD
&gt; instructions appearing in the &quot;_main&quot;
&gt; routine, which operate only on aligned
&gt; addresses. Since our routine doesn&#39;t
&gt; contain SIMD instructions, this line
&gt; is unnecessary.

I do not understand this point. Can someone give me an explanation of what it means to align the stack with the next 16-byte boundary and why it is required? And how is the `andl` achieving this?


What does it mean to align the stack?

I am writing a Asp.net MVC 2 application that uses Forms Authentication and currently I am having a problem with our iPhone application in regards to the authentication/login over the web. We have developed a simple iPhone app that uses the the UIWebView control. At this stage, all the app does is navigate to our Asp.Net website. Simple, right? The problem is, that the user cannot get past the login page. The repro steps are:

 * Open iPhone app.
 * The app navigates to the home page.
 * the user is not authenticated, so they are redirected to the login screen/page
 * The user enters the correct user name and password. clicks submit.
 * on the server side, the user is authenticated and a cookie is generated and sent to the client using FormsAuthentication.GetAuthCookie.
 * The server sends are redirect to send the user to the correct home page.

But the user is then redirected &lt;b&gt;BACK&lt;/b&gt; to the login screen!

I&#39;ve done some extensive debugging on this and what I do know is: 

The cookie is being sent to the client, and the client is storing the cookie. Verified this in the iPhone debugger and also by using Javsascript to display cookie data on the page. The cookie is being sent back to the server. Verified this in the Visual Studio debugger. It is the correct cookie (it&#39;s the same one that was set). The property User.Identity.IsAuthenticated returns false for some reason, even though the auth cookie is contained in the Request object.  I have verified that the iPhone app is setup to accept cookies, and they are on the client.

Here is the funny thing: It works fine if you open the Safari browser on the iPhone and go to our site directly. 

It has the same behaviour on the iPad too in that it doesn&#39;t get past the login screen. This repros on the emulators, and on devices.

This same web site has been tested with IE 7-8, Safari (for Windows), Blackberry, IEMobile 6.5, Phone 7 and it works find. The only circumstance that it doesn&#39;t work on is the UIWebView in the iPhone app.


 

Asp.Net Forms Authentication when using iPhone UIWebView

When cloning a repository with mercurial you can pass the -U/--noupdate flag to create a clone with no working copy. Can I remove the working copy if I forget to pass this flag at clone time? And if so, how?

This is conceptually similar to [this git question](https://stackoverflow.com/questions/2199897/git-convert-normal-to-bare-repository), but for mercurial.

How can I remove the working copy from a Mercurial clone?

<p>When cloning a repository with mercurial you can pass the -U/--noupdate flag to create a clone with no working copy. Can I remove the working copy if I forget to pass this flag at clone time? And if so, how?</p>
<p>This is conceptually similar to <a href="https://stackoverflow.com/questions/2199897/git-convert-normal-to-bare-repository" target="_blank" rel="noopener noreferrer">this git question</a>, but for mercurial.</p>


In a mercurial repo I can run `hg up {revision}` to change the revision of my working directory, but what command can I run to discover what revision I&#39;m looking at?

How can I find my working revision in mercurial

We now have a &quot;stiging&quot; branch, where &quot;staging&quot; seems to be a far better semantic fit. What&#39;s a good strategy for handling this?

Mercurial: Can I rename a branch?

I&#39;m having some difficulty cloning my mercurial repository over ssh.

Here&#39;s what I have tried:

    hg clone ssh://username@username.webfactional.com/path/to/projectname projectname

It&#39;s giving me this error:

    remote: bash: hg: command not found
    abort: no suitable response from remote hg!

hg is installed on the server, however.

I was trying to follow the instructions on [this website](http://echoreply.us/tuto/mercurial_site_management.html).


Cloning a Mercurial repository over SSH

I have a clone of a central repo at rev 2048. I want to remove the last 10 changesets on my local repo as if I was back in time two weeks ago. I suppose I could delete my local repo and do `&quot;hg clone -rev 2038&quot;` but that would be long (cloning the repo takes several minutes). Is there a way to just &quot;unpull&quot; some changesets?

Notes:

 - I&#39;m not trying to backout the changesets. I&#39;ll eventually pull those changesets again from the central repo.
 - I&#39;m not trying to update the working directory to an earlier version; I really want to affect the repository.
 - I don&#39;t have any outgoing changesets or pending modifications in my current repo and working directory.



How to remove certain changesets from a specific Mercurial clone?

We have a repository with three named branches, I wanted to clone one of the branches. Is there a mercurial command to do that? If I provide the path (of branch) with hg clone I get 404 error.

Mercurial clone from a branch

I have one repo in github which is public, there I have an Open source application i&#39;m working on that is for making product catalogs, and small cms content.

I also have a private repository (not hosted in github) which is an application developed under the open source application hosted in github.

Since I&#39;m currently working on both applications, adding features in the open source one and also making changes in the private one like changing the template and also pulling the code from the open source one.

I was wondering if there is any way in which I could pull the new stuff from the open source one but also pushing the code of the new application to the other repo.

Is it possible to pull from one repo and push to other one?

Taking into consideration that there are several git commands that make no sense in a bare repository (because bare repositories don&#39;t use indexes and do not have a working directory), 

    git reset --hard HEAD^ 

is not a solution to uncommit the last change in such a repository.

Searching through the Internet, all I could find related to the topic is [this][1], in which I am presented three ways of doing this:  
1. &quot;update the ref manually (which involves plumbing)&quot;;  
2. &quot;`git push -f` from a non-bare repository&quot;;  
3. &quot;`git branch -f this $that`&quot;.

  [1]: http://kerneltrap.org/mailarchive/git/2007/7/14/251529

Which solution do yo think is more appropriate or what other ways are there to do this? Unfortunately, the documentation I found about git bare repositories is fairly poor.

How can I uncommit the last commit in a git bare repository?

I have a git repository residing on a server with limited memory. 
When I try to clone an existing repository from the server I get the following error

    hemi@ubuntu:$ git clone ssh://hemi@servername.dk/home/hemi/repos/articles
    Initialized empty Git repository in /home/hemi/Skrivebord/articles/.git/
    hemi@servername.dk&#39;s password: 
    remote: Counting objects: 666, done.
    remote: warning: suboptimal pack - out of memory
    remote: fatal: Out of memory, malloc failed
    error: git upload-pack: git-pack-objects died with error.
    fatal: git upload-pack: aborting due to possible repository corruption on the remote side.
    remote: aborting due to possible repository corruption on the remote side.
    fatal: early EOF
    fatal: index-pack failed
    hemi@ubuntu:$ 

To handle this error I have tried to repack the original repository (according to [this forum post][1]). But instead of repacking the repository it describes how to use the &quot;git pack-objects&quot; command.

    hemi@servername:~/repos/articles$ git repack -a -d --window-memory 10m --max-pack-size 100m
    usage: git pack-objects [{ -q | --progress | --all-progress }]
            [--all-progress-implied]
            [--max-pack-size=N] [--local] [--incremental]
            [--window=N] [--window-memory=N] [--depth=N]
            [--no-reuse-delta] [--no-reuse-object] [--delta-base-offset]
            [--threads=N] [--non-empty] [--revs [--unpacked | --all]*]
            [--reflog] [--stdout | base-name] [--include-tag]
            [--keep-unreachable | --unpack-unreachable 
            [&lt;ref-list | &lt;object-list]

Git 1.6.5.7 is installed on the server.


  [1]: http://git.661346.n2.nabble.com/Large-pack-causes-git-clone-failures-what-to-do-td5481488.html


Repack of Git repository fails

I am working with Git repositories in the following way:

- I have the master repository and several remotes on the different production machines. 
- I am pushing the production code to the remotes and restart the services for the changes to take effect. 

I am about to switch from Git to Mercurial and I would like to know ahead how I can achieve something like that.

How can I add remote repositories in Mercurial?

My company&#39;s policy frowns upon artifacts downloaded automatically (they have to be approved), so in order to use Maven I need to disable access to Maven&#39;s central repository. 

In other words, I don&#39;t want Maven to attempt **any** downloads from central.

I know how to configure a local repository (networked or not), my idea is using a &quot;blessed&quot; machine to update the local repository.

PS: I could block requests at the proxy/network level, but I&#39;m asking about how to do it with Maven&#39;s configuration.

**UPDATE**
I finally figured out how to do it. In maven&#39;s home, in the `conf` directory is a global `settings.xml`.
You can either set a mirror to `central` that points to some internal server or just override it&#39;s definition.

Disable Maven central repository

My question is almost exactly this question:

[https://stackoverflow.com/questions/3900044/clone-textview-to-append-it-to-a-viewgroup][1]

However, I was inflating a view, and then attempting to clone it at the object level for performance reasons (I don&#39;t want to parse XML every single time), so that answer doesn&#39;t help me. View.clone() is protected and it apparently doesn&#39;t have a copy constructor. Is there any way to do this?


  [1]: https://stackoverflow.com/questions/3900044/clone-textview-to-append-it-to-a-viewgroup

How do I clone a View?

How can I clone a DateTime object in C#?

I was looking to find the difference between these four on Google and I expected there to be a huge amount of information on this, but there really wasn&#39;t any solid comparison between the four calls. 

I set about trying to compile a kind of basic at-a-glance look at the differences between these system calls and here&#39;s what I got. Is all this information correct/am I missing anything important ?

`Fork` : The fork call basically makes a duplicate of the current process, identical in almost every way (not everything is copied over, for example, resource limits in some implementations but the idea is to create as close a copy as possible).

The new process (child) gets a different process ID (PID) and has the PID of the old process (parent) as its parent PID (PPID). Because the two processes are now running exactly the same code, they can tell which is which by the return code of fork - the child gets 0, the parent gets the PID of the child. This is all, of course, assuming the fork call works - if not, no child is created and the parent gets an error code.

`Vfork` : The basic difference between vfork and fork is that when a new process is created with vfork(), the parent process is temporarily suspended, and the child process might borrow the parent&#39;s address space. This strange state of affairs continues until the child process either exits, or calls execve(), at which point the parent 
process continues. 

This means that the child process of a vfork() must be careful to avoid unexpectedly modifying variables of the parent process. In particular, the child process must not return from the function containing the vfork() call, and it must not call exit() (if it needs to exit, it should use _exit(); actually, this is also true for the child of a normal fork()). 

`Exec :` The exec call is a way to basically replace the entire current process with a new program. It loads the program into the current process space and runs it from the entry point. exec() replaces the current process with a the executable pointed by the function. Control never returns to the original program unless there is an exec() error.

`Clone :` Clone, as fork, creates a new process. Unlike fork, these calls allow the child process to share parts of its execution context with the calling process, such as the memory space, the table of file descriptors, and the table of signal handlers.

When the child process is created with clone, it executes the function application fn(arg). (This differs from fork, where execution continues in the child from the point of the original fork call.) The fn argument is a pointer to a function that is called by the child process at the beginning of its execution. The arg argument is passed to the fn function. 

When the fn(arg) function application returns, the child process terminates. The integer returned by fn is the exit code for the child process. The child process may also terminate explicitly by calling exit(2) or after receiving a fatal signal. 



Information gotten form : 

 - [https://stackoverflow.com/questions/1653340/exec-and-fork][1]
 - [http://www.allinterview.com/showanswers/59616.html][2]
 - [http://www.unixguide.net/unix/programming/1.1.2.shtml][3]
 - [http://linux.about.com/library/cmd/blcmdl2_clone.htm][4]


Thanks for taking the time to read this ! :)


  [1]: https://stackoverflow.com/questions/1653340/exec-and-fork
  [2]: http://www.allinterview.com/showanswers/59616.html
  [3]: http://www.unixguide.net/unix/programming/1.1.2.shtml
  [4]: http://linux.about.com/library/cmd/blcmdl2_clone.htm

The difference between fork(), vfork(), exec() and clone()

Consider this scenario:

```python
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os

walk = os.walk(&#39;/home&#39;)

for root, dirs, files in walk:
    for pathname in dirs+files:
        print os.path.join(root, pathname)

for root, dirs, files in walk:
    for pathname in dirs+files:
        print os.path.join(root, pathname)
```

I know that this example is kinda redundant, but you should consider that we need to use the same `walk` data more than once. I&#39;ve a benchmark scenario and the use of same `walk` data is mandatory to get helpful results.

I&#39;ve tried `walk2 = walk` to clone and use in the second iteration, but it didn&#39;t work. The question is... How can I copy it? Is it ever possible?

Thank you in advance.

How to clone a Python generator object?

I cannot do a SVN commit. I get this error:

    org.apache.subversion.javahl.ClientException: The working copy needs to be upgraded
    svn: Working copy &#39;C:\.... is too old (format 10, created by Subversion 1.6)

How can it be fixed?

SVN upgrade working copy

How can I diff my current working copy against a stash?

My use case: my working copy already contains a subset of the changes in my `stash@{0}`, but I don&#39;t want to apply _all_ the changes in `stash@{0}`. I want to do a diff to help determine which desirable changes in `stash@{0}` are still missing from my working copy.

Content Type	Original Author	Original Content on Stackoverflow
Question	richq	View Question on Stackoverflow
Solution 1 - Mercurial	pyfunc	View Answer on Stackoverflow
Solution 2 - Mercurial	Anon	View Answer on Stackoverflow

How can I remove the working copy from a Mercurial clone?

Mercurial Problem Overview

Mercurial Solutions

Solution 1 - Mercurial

Solution 2 - Mercurial

Asp.Net Forms Authentication when using iPhone UIWebView

What does it mean to align the stack?

Attributions