Youtube p4merge drivers#
There are two common usage or interaction patterns we have found relating to the use of merge drivers and merge tools: A ‘mergetool’ provides a graphical user interface to automate the conflict resolution process, often allowing the user to select content from one of the branches or possibly the ancestor for each of the conflicting regions in the file. It is possible to take the file with the markers produced by the driver and resolve the conflicts by editing that output in a text editor and then reporting that the file has been resolved. The user typically needs to resolve any conflicts in each file before the merge operation can be completed and committed. gitattributes file can then select between them using the filenames or extensions of the files being merged. The git config command can be used to configure different merge drivers and the. The diff3 merge driver in Git represents conflicts using a textual line based format consisting of marker lines using angle-bracket, equals or plus characters. This usually reports a message to the user, often using a line starting with a capital “ C” character. Using a return code, it signals to the invoking code whether there are any conflicts. The ‘merge driver’ receives three files corresponding to the ancestor and the two branches, loads the content into memory and is responsible for aligning their content and identifying any conflicts. In these cases it is not really a full merge and the merge driver may not be invoked.
It is also possible to specify a scenario such as ‘ours’ that produces a result that takes all of the files on a certain branch. In some cases the scenario will determine that a full merge is unnecessary and may, for example, perform a fast-forward merge. The ‘merge strategy’ is responsible for looking at all of the files and directories with an understanding of moves and renames, matching up the corresponding files, determining the appropriate ancestor and calling the merge driver on triples of files.
The merge (and also graft) process in Git involves a number of components: This post examines and discusses the various ways in which the git merge process can be extended and explains why we’re suggesting that its more appropriate to integrate our tree-based merge tools as merge-drivers rather than the more common route of providing a mergetool.
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