hardlink | 易学教程

Find out whether a file is a symbolic link in PowerShell

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问题 I am having a PowerShell script which is walking a directory tree, and sometimes I have auxiliary files hardlinked there which should not be processed. Is there an easy way of finding out whether a file (that is, System.IO.FileInfo ) is a hard link or not? If not, would it be easier with symbolic links (symlinks)? 回答1: Try this: function Test-ReparsePoint([string]$path) { $file = Get-Item $path -Force -ea SilentlyContinue return [bool]($file.Attributes -band [IO.FileAttributes]::ReparsePoint)

Find out whether a file is a symbolic link in PowerShell

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Find Out If Two HANDLEs are Hardlinks to the Same File

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问题 (This question is a toughie... it might require knowledge of NTFS and/or the use of NT Native APIs; be warned.) :) If I'm given two HANDLE s to two files, how can I definitively (not just with high probability) find out if the two HANDLE s belong to the exact same file and stream on the disk? This means, for example, checking the 8-byte NTFS file IDs isn't enough, because two HANDLE s with the same file ID can be pointing to different data streams of the same file, and I need to find out if

Can't Hard Link the gitconfig File

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问题 I am attempting to create a git repository to store all of my dotfiles and config files. My idea was to simply create hard links to all of the files I cared about and store those links in their own directory that I could turn into a repository. I've hit a bit of a snag though with my ~/.gitconfig file. It seems that whenever I run the 'git config' command the link that I created no longer points to the right location e.g. the file in the repository no longer updates properly. Here is an

Django: Copy FileFields

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问题 I'm trying to copy a file using a hardlink, where the file is stored as a Django FileField. I'd like to use a hardlink to save space and copy time (no changes are expected to be made to the original file or copy). However, I'm getting some odd errors when I try to call new_file.save() from the snippet below. AttributeError: 'file' object has no attribute '_committed' My thinking is that after making the hardlink, I can just open the linked file and store it to the Django new File instance's

Filesystem links on a FAT32 formatted storage

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问题 I know FAT32, as well as FAT16/12 neither support symbolic links nor hard-links . However I came up with this idea: The FAT specification describes that every file is associated with a directory-entry. In my understanding, one could say that a file-entry in a directory somehow or other points to the file's content. So, how can I define two directory-entries which point to the same file-content? Or, what could prevent me from doing so? Use case: I have a USB mass storage device for my car

Overriding SCons Cache Copy Function

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问题 I'm trying to figure out how to override the behaviour when SCons copies artifacts from the cache directory (given by CacheDir) to used hard-links. My current try def link_or_copy_file(class_instance, src, dst): # do hardlinking instead... SCons.Defaults.DefaultEnvironment()._copy_from_cache = link_or_copy_file SCons.Defaults.DefaultEnvironment()._copy2_from_cache = link_or_copy_file env = Environment() env._copy_from_cache = link_or_copy_file env._copy2_from_cache = link_or_copy_file has no

How can I programmatically distinguish hard links from real files in Windows 7?

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I have a difference between files size and used disk space (total file size is even more than disk size). I suppose because there are many hard links exist (to WinSxS components) in Windows 7/Vista. But how can I programmatically distinguish hard links from real files in Windows 7? You can't, because all files are hard links. No. Really. A file is just a hard link to a data chunk -- a listing in a directory. (Perhaps you mean symlinks? You can distinguish those...) Use the builtin methods Windows provides for calculating used space instead. EDIT: Reference (emphasis mine) The link itself is

Linux下的softlink和hardlink

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Linux中包括两种链接：硬链接(hard link)和软链接(soft link)，软链接又称为符号链接（symbolic link）创建命令： ln -s softlink destfile/directory #建立软连接 ln hardlink destfile #建立硬连接 inode 在Linux系统中，内核为每一个新创建的文件分配一个Inode，每个文件都有一个惟一的inode号，我们可以将inode简单理解成一个指针，它永远指向本文件的具体存储位置。文件属性保存在inode里，在访问文件时，inode被复制到内存在，从而实现文件的快速访问。系统是通过inode来定位每一个文件。硬链接（hard link）硬链接实际上是一个指针，指向源文件的inode，系统并不为它重新分配inode。硬连接不会建产新的inode，硬连接不管有多少个，都指向的是同一个inode节点，只是新建一个hard link会把结点连接数增加，只要结点的连接数不是0，文件就一直存在，不管你删除的是源文件还是连接的文件。只要有一个存在，文件就存在（其实就是引用计数的概念)。当你修改源文件或者连接文件任何一个的时候，其他的文件都会做同步的修改。软链接（soft link）软链接最直观的解释：相当于Windows系统的快捷方式，是一个独立文件（拥有独立的inode,与源文件inode无关）

Create a hardlink with Inno Setup

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问题 I have thousand of own installers that requires a critical dll file for uninstallation step, this dll file sizes about 2 mb then to avoid unnecessary disk space (2mb*100 installers) I would like to store the file once in {cf} then make a hardlink for the next installers that requires that file. I could create a hardlink in Inno Setup without the need of external apps such as mklink.exe usage? This is a brief example of what I have, all my installers follow the same "structure": [Files] ; VCL