In this scenario, we are in a directory called work which contains two other directories. One is called working, and the other one is called latest. The working directory holds a set of source code files. The latest directory holds the most recent version of those source code files, some of which have been modified. To be safe, the working directory is a copy of the current version of the text files. The diff command finds the differences between two files.
Its default action is to list the modified lines in the terminal window. One file is called slang. The -u unified option tells diff to also list some of the un-modified text lines from before and after each of the changed sections. These lines are called context lines. They help the patch command locate precisely where a change must be made in the original file. We provide the names of the files so that diff knows which files to compare.
The original file is listed first, then the modified file. This is the command we issue to diff :. If the files were identical, there would be no output listed at all. Seeing this type of output from diff confirms that there are differences between the two file versions and that the original file needs patching.
To capture those differences in a patch file, use the following command. The name of the patch file is arbitrary. You can call it anything you like. The -u unified option lets patch know that the patch file contains unified context lines. In other words, we used the -u option with diff, so we use the -u option with patch. We can instruct patch to make a backup copy of patched files before they are changed by using the -b backup option. The -i input option tells patch the name of the patch file to use:.
The file is patched as before, with no visible difference in the output. The date and time stamps of the files show that slang. We can use diff to create a patch file that contains all of the differences between the files in two directories. We can then use that patch file with patch to have those differences applied to the files in the working folder with a single command. The -N option tells diff how to handle files in the latest directory that are not in the working directory.
It forces diff to put instructions in the patch file so that patch creates files that are present in the latest directory but missing from the working directory. Scrolling further down through the patch file, we see that it then describes the changes in another file called structs.
This verifies that the patch file definitely contains the differences between different versions of multiple files. The --dry-run option tells patch to do everything apart from actually modifying the files. Either way, no files are modified. If no problems are reported, we can repeat the command without the --dry-run option and confidently patch our files. Out of the entire directory, diff found two files to patch.
The instructions regarding the modifications for those two files have been checked by patch , and no problems have been reported. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.
Contents Exit focus mode. Please rate your experience Yes No. Any additional feedback? Note The file must have the same key in the File Table of both the target image and the updated image. In this article. See Creating reviews from the command line. Revision information is included by default, so if you have Fisheye, you may be able to anchor the patch to get full context. The -dcu option provides a combination of "context format" and "unified format".
It provides the diff in a standard unified diff format which we need to parse the diff as well as revision information which we need to anchor to Fisheye. Later versions of Perforce do not support -dcu , so -z tag should be used instead. Since Perforce diffs do not include added and deleted files, you should use p4 opened to find such files.
You can follow a similar procedure with deleted files using p4 print to extract the previous version of the file. Creates a patch file with around three lines of code, before and after each change.
If you use Git-style diffs --git , the revision information will not be provided. This means that Crucible won't be able to directly find a revision to anchor to and will try to anchor to the newest revision on the main branch instead.
Crucible's Patch Anchoring feature allows you to add a regular patch showing only a few lines of context to a review. Then, Crucible will automatically search for the relevant file content in the connected repositories. When it finds the files, it will seamlessly add in more context from the files so that you can view all of the lines of code greatly enhancing the review process.
Crucible makes a 'best guess' in its processing — you should check that it has anchored the patch to the correct location in your repository. When you start the review, and view a diff, you will be able to choose more than three lines of context from the View menu. Screenshot: Viewing more than three lines with Patch Anchoring. Crucible latest 4.
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