How to support the ‘working-tree-encoding’ attribute in libgit2? - libgit2

I'm tracking a file (*.sra) in libgit2, and after making a change libgit2 identified the file as binary and wouldn't diff it for me. I discovered that the file was encoded in UTF-16.
Can libgit2 be taught to recognize that this file is text and handle it appropriately?
I'm using git, it can set 'working-tree-encoding' attribute to merge it,when conflict .

From what I can tell from reading gitattributes, libgit2 does not support working-tree-encoding:
Alternative Git implementations (e.g. JGit or libgit2) and older Git versions (as of March 2018) do not support the working-tree-encoding attribute. If you decide to use the working-tree-encoding attribute in your repository, then it is strongly recommended to ensure that all clients working with the repository support it.

Related

header's structure of .7z files?

Looking up in net I could find a general overview of rar format structure.
http://www.rarlab.com/technote.htm
But what would I be glad to be informed is how 7z files are segmented block by block.
thanks.
Refer to the DOC/7zFormat.txt file in the source distribution (an updated version can be found in the official SDK: https://www.7-zip.org/sdk.html).
http://fileformats.archiveteam.org/wiki/7z
To get a better understanding of the file format, you can use hachoir-wx (needs installed wxPython) to navigate an archive to the bit level. It is available via pip. Their parser supports 7zip among lots of other file formats.

Can I do git-clean with libgit2?

I want to remove untracked files from the working tree. Like here
https://www.kernel.org/pub/software/scm/git/docs/git-clean.html
libgit2 doesn't implement this itself. It's a porcelain command, which deals with interaction with the user. It also deals primarily with files which are of no interest to the Git repository.
You can run status to see which files are untracked and then remove whichever ones the version of git-clean would have removed through the usual means available in your programming language.

Can a git repository have N working trees

I try to write a file store based on libgit2.
Software snapshots should be saved as branches mysoftware and specific versions committed and tagged. Then later I want to checkout the tags to different directories.
When looking at git_checkout_tree, it seems like there is only one working tree for a repository and thus it does not even seem possible to checkout multiple working trees concurrently.
Is this correct!?
EDIT:
Additionally, I would like for this thing to work on Windows without the need for cygwin!
The git_checkout_opts structure in libgit2 contains a target_directory option that will allow git_checkout_tree() to write to a different directory instead of using the default working tree for the repository. This would allow you to custom build a solution with libgit2 that maintained multiple checked out copies.
Without using that option, a libgit2 git_repository object expects there will be just one working directory and looks to the core.worktree config option if it isn't the "natural" working directory for the repository.
The git-new-workdir tricks with symlinks in the .git directory don't work great with libgit2 right now, I'm afraid, and particularly doesn't work well on Windows. I'd love to see this addressed, but it isn't too high on my priority list.
Git doesn't support this natively, but you can use git-new-workdir to do it.

Do the entries in .gitignore get applied to the SVN repository when using git-svn?

If I tell git to ignore x amount of files and never add them to the repository, will those files also make it into the svn:ignore property? And if so, how can I keep .gitignore local to only my local git repository?
EDIT Sorry about the duplicate, I searched on here and couldn't find anything on it.
No, git will not do anything with svn:ignore.
From the documentation:
We ignore all SVN properties except svn:executable. Any unhandled properties are logged to $GIT_DIR/svn//unhandled.log
Also this other StackOverflow question is very similar.
If you want the .gitignore local to your repo, don't commit it.
Similar question:
How can you indicate files to ignore in svn when using git and the git-svn bridge
git-svn does neither .gitignore — svn:ignore, nor git attributes — svn properties conversion.
You may consider using SubGit instead. It does properly handle ignore, properties, merge-tracking data, etc. Among other things it works on a server-side, so one can use any Git client available to send changes to Subversion repository.
See documentation and comparison with git-svn.

darcs equivalent for git's submodules?

so yeah just wondering if darcs has anything equivalent to git's submodules.
i.e. lets say I have a repo (myapp) and I have a folder in it called mylibrary. mylibrary doesn't really have anything to do with myapp's development, it just has to be included. mylibrary's development happens in it's own repo, but when someone pulls myapp, it'll also pull an up-to-date version of mylibrary. any ideas?
My first thought: Since darcs is simpler than git (i.e., no branches and remotes--instead you just use directories and URLs, and it's your task to manage them), a darcs submodule would not give much more than what you can achieve with standard things like subdirectories or files inside you darcs repo.
If you needed a submodule in order to fix a certain state of the source of the used library, you could perhaps simply put a copy of the library's repo as a subdir and add it to your project's darcs. Compared to git, this would have the disadvantage of bloating the data transfer when someone gets your repo.
If you needed a submodule to tell those who get your repo where to get the updated source of the library (without bloating the size of your repo), you could simply put an URL and an instruction into a README file, or a script, or whatever. Compared to git, the disadvantage is that the state of the library's source as it was when you used it wouldn't be recorded in your commit, so people might get another version of the library, and the compilation wouldn't succeed, and it wouldn't be clear why.
So, the really interesting goal of a submodule could be not just to tell people where to get the library source from (as you write in the question), but to record the state of the subproject that you have actually used for compiling your project, and not to bloat your repo for those who don't want to get the source of the subproject.
Probably, this goal could also be achieved by storing more complex metadata about the state of the subproject, and a more complex hook to get exactly that state (or--by choice--another state) of the subproject. AFAIK from the docs, there is no built-in mechanism for such submodules.
Update (found on the darcs site):
http://darcs.net/Ideas/Subrepositories;
http://darcs.net/Ideas/NestedRepositories.
So, darcs will notice another darcs repo inside your working and it won't touch it. So the first way I've suggested above is shut (if you leave the darcs metadata there).
The second way is like something suggested in one of the section of the latter link. (They suggest an "uglu" script for something like this.)
Another (3rd) idea
Import the patches from the repo you intend to have as a submodule, but first move all files into a subdir. If it were possible just to apply such a moving special patch once and if it was effective for all the patches you import from the repo intended as submodule, but not to the patches you import from a "branch" of the main repo...
...well, it could be a special variant of the pull command (say, import) and of the push command (say, export) that would additionaly translate the paths accordingly.
I don't know of any submodule concept for darcs, which means the usual way to refer to another (shared) repo from a darcs repo would be through symlinks.
Since symlinks aren't supported with darcs, that means you needs to put in place a "posthook sh update-symlinks.sh" hook script to restore those links.
But you could also use add to this hook a check to see first what version of the lined repo is currently loaded, and update that version if needed (provided you have store in one way or another the exact version you need for that shared repo).
That last suggestion is actually close to the implementation of Git submodules or Mercurial subrepos.