commit | 06e06fc291a8ccc0e68b7d84b54097a9635df740 | [log] [tgz] |
---|---|---|
author | Matthias Sohn <matthias.sohn@sap.com> | Sun Aug 26 19:44:29 2018 +0200 |
committer | Matthias Sohn <matthias.sohn@sap.com> | Fri Sep 07 12:13:53 2018 +0200 |
tree | 82e5cf77e0b4ee6519b4e05faebc967418e0ba62 | |
parent | 6bec391d3693a38f812473413db2b4f73acf70fd [diff] |
Fix atomic lock file creation on NFS FS_POSIX.createNewFile(File) failed to properly implement atomic file creation on NFS using the algorithm [1]: - name of the hard link must be unique to prevent that two processes using different NFS clients try to create the same link. This would render nlink useless to detect if there was a race. - the hard link must be retained for the lifetime of the file since we don't know when the state of the involved NFS clients will be synchronized. This depends on NFS configuration options. To fix these issues we need to change the signature of createNewFile which would break API. Hence deprecate the old method FS.createNewFile(File) and add a new method createNewFileAtomic(File). The new method returns a LockToken which needs to be retained by the caller (LockFile) until all involved NFS clients synchronized their state. Since we don't know when the NFS caches are synchronized we need to retain the token until the corresponding file is no longer needed. The LockToken must be closed after the LockFile using it has been committed or unlocked. On Posix, if core.supportsAtomicCreateNewFile = false this will delete the hard link which guarded the atomic creation of the file. When acquiring the lock fails ensure that the hard link is removed. [1] https://www.time-travellers.org/shane/papers/NFS_considered_harmful.html also see file creation flag O_EXCL in http://man7.org/linux/man-pages/man2/open.2.html Change-Id: I84fcb16143a5f877e9b08c6ee0ff8fa4ea68a90d Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
An implementation of the Git version control system in pure Java.
This package is licensed under the EDL (Eclipse Distribution License).
JGit can be imported straight into Eclipse, built and tested from there, but the automated builds use Maven.
org.eclipse.jgit
A pure Java library capable of being run standalone, with no additional support libraries. It provides classes to read and write a Git repository and operate on a working directory.
All portions of JGit are covered by the EDL. Absolutely no GPL, LGPL or EPL contributions are accepted within this package.
org.eclipse.jgit.ant
Ant tasks based on JGit.
org.eclipse.jgit.archive
Support for exporting to various archive formats (zip etc).
org.eclipse.jgit.http.apache
Apache httpclient support
org.eclipse.jgit.http.server
Server for the smart and dumb Git HTTP protocol.
org.eclipse.jgit.pgm
Command-line interface Git commands implemented using JGit (“pgm” stands for program).
org.eclipse.jgit.packaging
Production of Eclipse features and p2 repository for JGit. See the JGit Wiki on why and how to use this module.
org.eclipse.jgit.junit
Helpers for unit testing
org.eclipse.jgit.test
Unit tests for org.eclipse.jgit
org.eclipse.jgit.ant.test
org.eclipse.jgit.pgm.test
org.eclipse.jgit.http.test
org.eclipse.jgit.junit.test
No further description needed
Native smbolic links are supported, provided the file system supports them. For Windows you must have Windows Vista/Windows 2008 or newer, use a non-administrator account and have the SeCreateSymbolicLinkPrivilege.
Only the timestamp of the index is used by jgit if the index is dirty.
JGit requires at least a Java 8 JDK.
CRLF conversion is performed depending on the core.autocrlf setting, however Git for Windows by default stores that setting during installation in the “system wide” configuration file. If Git is not installed, use the global or repository configuration for the core.autocrlf setting.
The system wide configuration file is located relative to where C Git is installed. Make sure Git can be found via the PATH environment variable. When installing Git for Windows check the “Run Git from the Windows Command Prompt” option. There are other options like Eclipse settings that can be used for pointing out where C Git is installed. Modifying PATH is the recommended option if C Git is installed.
We try to use the same notation of $HOME as C Git does. On Windows this is often not the same value as the user.home system property.
org.eclipse.jgit/
Read loose and packed commits, trees, blobs, including deltafied objects.
Read objects from shared repositories
Write loose commits, trees, blobs.
Write blobs from local files or Java InputStreams.
Read blobs as Java InputStreams.
Copy trees to local directory, or local directory to a tree.
Lazily loads objects as necessary.
Read and write .git/config files.
Create a new repository.
Read and write refs, including walking through symrefs.
Read, update and write the Git index.
Checkout in dirty working directory if trivial.
Walk the history from a given set of commits looking for commits introducing changes in files under a specified path.
Object transport Fetch via ssh, git, http, Amazon S3 and bundles. Push via ssh, git and Amazon S3. JGit does not yet deltify the pushed packs so they may be a lot larger than C Git packs.
Garbage collection
Merge
Rebase
And much more
org.eclipse.jgit.pgm/
org.eclipse.jgit.ant/
org.eclipse.jgit.archive/
org.eclipse.http.*/
There are some missing features:
Post question, comments or patches to the jgit-dev@eclipse.org mailing list. You need to be subscribed to post, see here:
https://dev.eclipse.org/mailman/listinfo/jgit-dev
See the EGit Contributor Guide:
http://wiki.eclipse.org/EGit/Contributor_Guide
More information about Git, its repository format, and the canonical C based implementation can be obtained from the Git website: