Lua lfs lock

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Lua lfs lock

Returns a table with the file attributes corresponding to filepath or nil followed by an error message in case of error. If the second optional argument is given, then only the value of the named attribute is returned this use is equivalent to lfs. The attributes are described as follows; attribute mode is a string, all the others are numbers, and the time related attributes use the same time reference of os.

On Windows systems, represents the drive number of the disk containing the file ino: on Unix systems, this represents the inode number. On Windows systems this has no meaning mode: string representing the associated protection mode the values could be file, directory, link, socket, named pipe, char device, block device or other nlink: number of hard links to the file uid: user-id of owner Unix only, always 0 on Windows gid: group-id of owner Unix only, always 0 on Windows rdev: on Unix systems, represents the device type, for special file inodes.

To obtain information about the link itself, see function lfs. Returns true in case of success or nil plus an error string. To free the the lock call lock:free. In case of any errors it returns nil and the error message. Raises an error if path is not a directory. This function works on open files; the file handle should be specified as the first argument. The optional arguments start and length can be used to specify a starting point and its length; both should be numbers.

Returns true if the operation was successful; in case of error, it returns nil plus an error string. The argument is the name of the new directory. The argument is the name of the directory. The mode string can be either binary or text. Returns the previous mode string for the file.

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This function is only available in Windows, so you may want to make sure that lfs. This function is not available in Windows so you may want to make sure that lfs. This function is a bind to utime function. The first argument is the filename, the second argument atime is the access time, and the third argument mtime is the modification time. Both times are provided in seconds which should be generated with Lua standard function os.

If the modification time is omitted, the access time provided is used; if both times are omitted, the current time is used.LuaFileSystem is a Lua library developed to complement the set of functions related to file systems offered by the standard Lua distribution. LuaFileSystem offers a portable way to access the underlying directory structure and file attributes. LuaFileSystem should be built with Lua 5. LuaFileSystem offers a Makefile and a separate configuration file, configwhich should be edited to suit your installation before running make.

The file has some definitions like paths to the external libraries, compiler options and the like. If you prefer to install LuaFileSystem manually, the compiled binary should be copied to a directory in your C path.

Introduction LuaFileSystem is a Lua library developed to complement the set of functions related to file systems offered by the standard Lua distribution. Building LuaFileSystem should be built with Lua 5. Installation The easiest way to install LuaFileSystem is to use LuaRocks: luarocks install luafilesystem If you prefer to install LuaFileSystem manually, the compiled binary should be copied to a directory in your C path.

Reference LuaFileSystem offers the following functions: lfs. If the second optional argument is given and is a string, then only the value of the named attribute is returned this use is equivalent to lfs. The attributes are described as follows; attribute mode is a string, all the others are numbers, and the time related attributes use the same time reference of os.

On Windows systems, represents the drive number of the disk containing the file ino on Unix systems, this represents the inode number. On Windows systems this has no meaning mode string representing the associated protection mode the values could be filedirectorylinksocketnamed pipechar deviceblock device or other nlink number of hard links to the file uid user-id of owner Unix only, always 0 on Windows gid group-id of owner Unix only, always 0 on Windows rdev on Unix systems, represents the device type, for special file inodes.

To obtain information about the link itself, see function lfs. Returns true in case of success or nil plus an error string.

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To free the the lock call lock:free. In case of any errors it returns nil and the error message. In particular, if the lock exists and is not stale it returns the "File exists" message.

Raises an error if path is not a directory. This function works on open files ; the file handle should be specified as the first argument.

The optional arguments start and length can be used to specify a starting point and its length; both should be numbers. Returns true if the operation was successful; in case of error, it returns nil plus an error string.

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The first argument is the object to link to and the second is the name of the link. If the optional third argument is true, the link will by a symbolic link by default, a hard link is created.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. We need the ability to lock files to discourage we can never prevent parallel editing of binary files which will result in an unmergeable situation.

The simplest way to organise locking is to require that if binary files are only ever edited on a single branch, and therefore editing this file can follow a simple sequence:. In practice teams need to work on more than one branch, and sometimes that work will have corresponding binary edits. It's important to remember that the core requirement is to prevent unintended parallel edits of an unmergeable file. One way to address this would be to say that locking a file locks it across all branches, and that lock is only released when the branch where the edit is is merged back into a 'primary' branch.

The problem is that although that allows branching and also prevents merge conflicts, it forces merging of feature branches before a further edit can be made by someone else. An alternative is that locking a file locks it across all branches, but when the lock is released, further locks on that file can only be taken on a descendant of the latest edit that has been made, whichever branch it is on.

That means a change to the rules of the lock sequence, namely:. This means that long-running branches can be maintained but that editing of a binary file must always incorporate the latest binary edits.

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This means that if this system is always respected, there is only ever one linear stream of development for this binary file, even though that 'thread' may wind its way across many different branches in the process.

This does mean that no-one's changes are accidentally lost, but it does mean that we are either making new branches dependent on others, OR we're cherry-picking changes to individual files across branches. This does change the traditional git workflow, but importantly it achieves the core requirement of never accidentally losing anyone's changes.

How changes are threaded across branches is always under the user's control.

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We must allow the user to break the rules if they know what they are doing. Locking is there to prevent unintended binary merge conflicts, but sometimes you might want to intentionally create one, with the full knowledge that you're going to have to manually merge the result or more likely, pick one side and discard the other later down the line.

There are 2 cases of rule breaking to support:. Break someone else's lock People lock files and forget they've locked them, then go on holiday, or worse, leave the company.

You can't be stuck not being able to edit that file so must be able to forcibly break someone else's lock. This effectively removes the other person's lock and is likely to cause them problems if they had edited and try to push next time. Allow a parallel lock Actually similar to breaking someone else's lock, except it lets you take another lock on a file in parallel, leaving their lock in place too, and knowing that you're going to have to resolve the merge problem later.

However by explicitly registering a parallel lock possible form: 'git lfs lock --force' this could be recorded and communicated to anyone else with a lock, letting them know about possible merge issues down the line.

This is useful because it means it provides a reminder that the user should be locking the file before they start to edit it, to avoid the case of an unexpected merge later on. To make the implementing locking on the lfs-test-server as well as other servers in the future easier, it makes sense to create a lock package that can be depended upon from any server.

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This will go along with Steve's refactor which touches the lfs package quite a bit. The lock command will be used in accordance with the multi-branch flow as proposed above to request that lock be granted to the specific path passed an argument to the command. The unlock command is responsible for releasing the lock against a particular file.

The API associated with this command can also be used on the server to remove existing locks after a push. Clients can determine whether or not their lock was removed by calling the Active method on the returned Lock, if UnlockResult. Err is nil. For many operations, the LFS client will need to have knowledge of existing locks on the server.

lua lfs lock

To remove this need, both the locks command and corresponding API method take several filters. Clients should turn the flag-values that were passed during the command invocation into Filter s as described below, and batched up into the Filters field in the LockListRequest.

Skip to content. Permalink Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up.Git LFS v2. File Locking lets developers lock files they are updating to prevent other users from updating them at the same time. Concurrent edits in Git repositories will lead to merge conflicts, which are very difficult to resolve in large binary files. Git has built-in tools for resolving merge conflicts in text files such as source code, documentation, etc.

The first step to using File Locking is to define what file types need the extra overhead. The git lfs track command includes a --lockable flag. If you'd like to register a file type as lockable, without using LFS, you can edit the.

File Locking

Once file patterns in. This prevents users from accidentally editing a file without locking it first.

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This registers the file as locked in your name on the server. You can view this with the locks command. The file will also be ready for you to edit and push locally. If at any time you decide you don't need the lock, you can remove it by passing the path or ID to the unlock command. Note: Different LFS server implementations may have different permissions. Some may require admin privileges to unlock someone else's lock, for example. Git LFS will verify that you're not modifying a file locked by another user when pushing.

You'll see a message like this:. Skip to content. File Locking Jump to bottom. Tracking Lockable files Git has built-in tools for resolving merge conflicts in text files such as source code, documentation, etc.

lua lfs lock

Pages 7. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.Imagine a "drawing" app that allows users to create and save image-based files to the device's documents directory system. However, for more advanced functionality like file sharing, where users can import and export drawings, Lua by itself will not suffice.

lua lfs lock

This is where LFS can be extremely powerful. Essentially, every time the app is launched, LFS can be used to scan the contents of system. DocumentsDirectory and "check" for new drawings. This can be done as often as needed to ensure an accurate account of exactly what's inside the folder. Here's a basic example of how to iterate over the contents of an app's documents directory using a for loop:. If an app downloads external assets files and those files must be organized in a logical manner, adding or removing directories is absolutely essential.

Fortunately, LFS makes this task easy:. If you need to remove delete a directory, use the existing os. Imagine a file called mydata. To set a timestamp for when the user last read the file, use LFS to touch the file.

To find out when a file was last modified, the access or modification properties of lfs. The value returned for the timestamp will be the number of seconds since January 1, at midnight. For more information on time and dates in Corona, see the Utilizing Time and Dates tutorial. LFS is very powerful and it can do much more than what is illustrated in this guide. Fortunately, most of the LFS functions are straightforward and easy to use. Please see the LFS Reference for a complete listing of available functions and syntax details for each one.

Report an Issue. Directory Scanning Imagine a "drawing" app that allows users to create and save image-based files to the device's documents directory system. DocumentsDirectory for file in lfs. Adding Directories If an app downloads external assets files and those files must be organized in a logical manner, adding or removing directories is absolutely essential.

Fortunately, LFS makes this task easy: First, set the destination for the new directory using lfs. Deleting Directories If you need to remove delete a directory, use the existing os. DocumentsDirectory if result then print "Directory removed! Setting a New Timestamp Imagine a file called mydata. DocumentsDirectory -- "Touch" the file lfs.

Retrieving an Existing Timestamp To find out when a file was last modified, the access or modification properties of lfs. Further Reference LFS is very powerful and it can do much more than what is illustrated in this guide.

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All Rights Reserved. Help us help you! If you notice a problem with this page, please report it.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. We need the ability to lock files to discourage we can never prevent parallel editing of binary files which will result in an unmergeable situation.

The simplest way to organise locking is to require that if binary files are only ever edited on a single branch, and therefore editing this file can follow a simple sequence:. In practice teams need to work on more than one branch, and sometimes that work will have corresponding binary edits.

It's important to remember that the core requirement is to prevent unintended parallel edits of an unmergeable file. One way to address this would be to say that locking a file locks it across all branches, and that lock is only released when the branch where the edit is is merged back into a 'primary' branch.

The problem is that although that allows branching and also prevents merge conflicts, it forces merging of feature branches before a further edit can be made by someone else. An alternative is that locking a file locks it across all branches, but when the lock is released, further locks on that file can only be taken on a descendant of the latest edit that has been made, whichever branch it is on. That means a change to the rules of the lock sequence, namely:.

This means that long-running branches can be maintained but that editing of a binary file must always incorporate the latest binary edits. This means that if this system is always respected, there is only ever one linear stream of development for this binary file, even though that 'thread' may wind its way across many different branches in the process.

lua lfs lock

This does mean that no-one's changes are accidentally lost, but it does mean that we are either making new branches dependent on others, OR we're cherry-picking changes to individual files across branches.

This does change the traditional git workflow, but importantly it achieves the core requirement of never accidentally losing anyone's changes.

How changes are threaded across branches is always under the user's control. We must allow the user to break the rules if they know what they are doing. Locking is there to prevent unintended binary merge conflicts, but sometimes you might want to intentionally create one, with the full knowledge that you're going to have to manually merge the result or more likely, pick one side and discard the other later down the line.

There are 2 cases of rule breaking to support:. Break someone else's lock People lock files and forget they've locked them, then go on holiday, or worse, leave the company. You can't be stuck not being able to edit that file so must be able to forcibly break someone else's lock. This effectively removes the other person's lock and is likely to cause them problems if they had edited and try to push next time.

Allow a parallel lock Actually similar to breaking someone else's lock, except it lets you take another lock on a file in parallel, leaving their lock in place too, and knowing that you're going to have to resolve the merge problem later. However by explicitly registering a parallel lock possible form: 'git lfs lock --force' this could be recorded and communicated to anyone else with a lock, letting them know about possible merge issues down the line.LuaFileSystem offers a portable way to access the underlying directory structure and file attributes.

It was developed for Lua 5.

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Version 1. The following example iterates over a directory and recursively lists the attributes for each file inside it. Refer to Compat Windows users can use the binary version of LuaFileSystem lfs. Returns a table with the file attributes corresponding to filepath or nil followed by an error message in case of error. If the second optional argument is given, then only the value of the named attribute is returned this use is equivalent to lfs.

The attributes are described as follows; attribute mode is a string, all the others are numbers, and the time related attributes use the same time reference of os.

Lua iterator over the entries of a given directory. Each time the iterator is called it returns a string with an entry of the directory; nil is returned when there is no more entries. Raises an error if path is not a directory.

Locks a file or a part of it. This function works on open files ; the file handle should be specified as the first argument. The optional arguments start and length can be used to specify a starting point and its length; both should be numbers. Returns true if the operation was successful; in case of error, it returns nil plus an error string.

Set access and modification times of a file. This function is a bind to utime function. The first argument is the filename, the second argument atime is the access time, and the third argument mtime is the modification time. Both times are provided in seconds which should be generated with Lua standard function os.

If the modification time is omitted, the access time provided is used; if both times are omitted, the current time is used. Unlocks a file or a part of it. LuaFileSystem is free software: it can be used for both academic and commercial purposes at absolutely no cost.

The legal details are below. The spirit of the license is that you are free to use LuaFileSystem for any purpose at no cost without having to ask us. The only requirement is that if you do use LuaFileSystem, then you should give us credit by including the appropriate copyright notice somewhere in your product or its documentation. The implementation is not derived from licensed software.

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.


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