6ff518f593
Teach "git p4" to send large blobs outside the repository by talking to Git LFS. * ls/p4-lfs: git-p4: add Git LFS backend for large file system git-p4: add support for large file systems git-p4: check free space during streaming git-p4: add file streaming progress in verbose mode git-p4: return an empty list if a list config has no values git-p4: add gitConfigInt reader git-p4: add optional type specifier to gitConfig reader
625 lines
21 KiB
Plaintext
625 lines
21 KiB
Plaintext
git-p4(1)
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=========
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NAME
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----
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git-p4 - Import from and submit to Perforce repositories
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SYNOPSIS
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--------
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[verse]
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'git p4 clone' [<sync options>] [<clone options>] <p4 depot path>...
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'git p4 sync' [<sync options>] [<p4 depot path>...]
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'git p4 rebase'
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'git p4 submit' [<submit options>] [<master branch name>]
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DESCRIPTION
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-----------
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This command provides a way to interact with p4 repositories
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using Git.
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Create a new Git repository from an existing p4 repository using
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'git p4 clone', giving it one or more p4 depot paths. Incorporate
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new commits from p4 changes with 'git p4 sync'. The 'sync' command
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is also used to include new branches from other p4 depot paths.
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Submit Git changes back to p4 using 'git p4 submit'. The command
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'git p4 rebase' does a sync plus rebases the current branch onto
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the updated p4 remote branch.
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EXAMPLE
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-------
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* Clone a repository:
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+
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------------
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$ git p4 clone //depot/path/project
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------------
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* Do some work in the newly created Git repository:
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+
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------------
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$ cd project
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$ vi foo.h
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$ git commit -a -m "edited foo.h"
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------------
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* Update the Git repository with recent changes from p4, rebasing your
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work on top:
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+
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------------
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$ git p4 rebase
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------------
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* Submit your commits back to p4:
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+
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------------
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$ git p4 submit
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------------
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COMMANDS
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--------
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Clone
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~~~~~
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Generally, 'git p4 clone' is used to create a new Git directory
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from an existing p4 repository:
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------------
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$ git p4 clone //depot/path/project
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------------
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This:
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1. Creates an empty Git repository in a subdirectory called 'project'.
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+
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2. Imports the full contents of the head revision from the given p4
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depot path into a single commit in the Git branch 'refs/remotes/p4/master'.
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+
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3. Creates a local branch, 'master' from this remote and checks it out.
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To reproduce the entire p4 history in Git, use the '@all' modifier on
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the depot path:
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------------
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$ git p4 clone //depot/path/project@all
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------------
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Sync
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~~~~
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As development continues in the p4 repository, those changes can
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be included in the Git repository using:
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------------
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$ git p4 sync
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------------
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This command finds new changes in p4 and imports them as Git commits.
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P4 repositories can be added to an existing Git repository using
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'git p4 sync' too:
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------------
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$ mkdir repo-git
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$ cd repo-git
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$ git init
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$ git p4 sync //path/in/your/perforce/depot
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------------
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This imports the specified depot into
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'refs/remotes/p4/master' in an existing Git repository. The
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'--branch' option can be used to specify a different branch to
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be used for the p4 content.
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If a Git repository includes branches 'refs/remotes/origin/p4', these
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will be fetched and consulted first during a 'git p4 sync'. Since
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importing directly from p4 is considerably slower than pulling changes
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from a Git remote, this can be useful in a multi-developer environment.
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If there are multiple branches, doing 'git p4 sync' will automatically
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use the "BRANCH DETECTION" algorithm to try to partition new changes
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into the right branch. This can be overridden with the '--branch'
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option to specify just a single branch to update.
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Rebase
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~~~~~~
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A common working pattern is to fetch the latest changes from the p4 depot
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and merge them with local uncommitted changes. Often, the p4 repository
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is the ultimate location for all code, thus a rebase workflow makes
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sense. This command does 'git p4 sync' followed by 'git rebase' to move
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local commits on top of updated p4 changes.
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------------
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$ git p4 rebase
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------------
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Submit
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~~~~~~
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Submitting changes from a Git repository back to the p4 repository
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requires a separate p4 client workspace. This should be specified
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using the 'P4CLIENT' environment variable or the Git configuration
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variable 'git-p4.client'. The p4 client must exist, but the client root
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will be created and populated if it does not already exist.
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To submit all changes that are in the current Git branch but not in
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the 'p4/master' branch, use:
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------------
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$ git p4 submit
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------------
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To specify a branch other than the current one, use:
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------------
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$ git p4 submit topicbranch
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------------
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The upstream reference is generally 'refs/remotes/p4/master', but can
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be overridden using the '--origin=' command-line option.
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The p4 changes will be created as the user invoking 'git p4 submit'. The
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'--preserve-user' option will cause ownership to be modified
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according to the author of the Git commit. This option requires admin
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privileges in p4, which can be granted using 'p4 protect'.
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OPTIONS
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-------
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General options
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~~~~~~~~~~~~~~~
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All commands except clone accept these options.
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--git-dir <dir>::
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Set the 'GIT_DIR' environment variable. See linkgit:git[1].
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-v::
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--verbose::
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Provide more progress information.
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Sync options
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~~~~~~~~~~~~
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These options can be used in the initial 'clone' as well as in
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subsequent 'sync' operations.
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--branch <ref>::
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Import changes into <ref> instead of refs/remotes/p4/master.
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If <ref> starts with refs/, it is used as is. Otherwise, if
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it does not start with p4/, that prefix is added.
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+
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By default a <ref> not starting with refs/ is treated as the
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name of a remote-tracking branch (under refs/remotes/). This
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behavior can be modified using the --import-local option.
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+
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The default <ref> is "master".
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+
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This example imports a new remote "p4/proj2" into an existing
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Git repository:
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+
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----
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$ git init
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$ git p4 sync --branch=refs/remotes/p4/proj2 //depot/proj2
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----
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--detect-branches::
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Use the branch detection algorithm to find new paths in p4. It is
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documented below in "BRANCH DETECTION".
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--changesfile <file>::
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Import exactly the p4 change numbers listed in 'file', one per
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line. Normally, 'git p4' inspects the current p4 repository
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state and detects the changes it should import.
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--silent::
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Do not print any progress information.
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--detect-labels::
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Query p4 for labels associated with the depot paths, and add
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them as tags in Git. Limited usefulness as only imports labels
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associated with new changelists. Deprecated.
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--import-labels::
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Import labels from p4 into Git.
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--import-local::
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By default, p4 branches are stored in 'refs/remotes/p4/',
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where they will be treated as remote-tracking branches by
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linkgit:git-branch[1] and other commands. This option instead
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puts p4 branches in 'refs/heads/p4/'. Note that future
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sync operations must specify '--import-local' as well so that
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they can find the p4 branches in refs/heads.
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--max-changes <n>::
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Import at most 'n' changes, rather than the entire range of
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changes included in the given revision specifier. A typical
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usage would be use '@all' as the revision specifier, but then
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to use '--max-changes 1000' to import only the last 1000
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revisions rather than the entire revision history.
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--changes-block-size <n>::
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The internal block size to use when converting a revision
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specifier such as '@all' into a list of specific change
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numbers. Instead of using a single call to 'p4 changes' to
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find the full list of changes for the conversion, there are a
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sequence of calls to 'p4 changes -m', each of which requests
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one block of changes of the given size. The default block size
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is 500, which should usually be suitable.
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--keep-path::
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The mapping of file names from the p4 depot path to Git, by
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default, involves removing the entire depot path. With this
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option, the full p4 depot path is retained in Git. For example,
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path '//depot/main/foo/bar.c', when imported from
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'//depot/main/', becomes 'foo/bar.c'. With '--keep-path', the
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Git path is instead 'depot/main/foo/bar.c'.
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--use-client-spec::
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Use a client spec to find the list of interesting files in p4.
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See the "CLIENT SPEC" section below.
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-/ <path>::
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Exclude selected depot paths when cloning or syncing.
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Clone options
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~~~~~~~~~~~~~
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These options can be used in an initial 'clone', along with the 'sync'
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options described above.
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--destination <directory>::
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Where to create the Git repository. If not provided, the last
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component in the p4 depot path is used to create a new
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directory.
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--bare::
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Perform a bare clone. See linkgit:git-clone[1].
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Submit options
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~~~~~~~~~~~~~~
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These options can be used to modify 'git p4 submit' behavior.
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--origin <commit>::
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Upstream location from which commits are identified to submit to
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p4. By default, this is the most recent p4 commit reachable
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from 'HEAD'.
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-M::
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Detect renames. See linkgit:git-diff[1]. Renames will be
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represented in p4 using explicit 'move' operations. There
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is no corresponding option to detect copies, but there are
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variables for both moves and copies.
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--preserve-user::
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Re-author p4 changes before submitting to p4. This option
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requires p4 admin privileges.
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--export-labels::
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Export tags from Git as p4 labels. Tags found in Git are applied
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to the perforce working directory.
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-n::
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--dry-run::
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Show just what commits would be submitted to p4; do not change
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state in Git or p4.
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--prepare-p4-only::
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Apply a commit to the p4 workspace, opening, adding and deleting
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files in p4 as for a normal submit operation. Do not issue the
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final "p4 submit", but instead print a message about how to
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submit manually or revert. This option always stops after the
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first (oldest) commit. Git tags are not exported to p4.
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--conflict=(ask|skip|quit)::
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Conflicts can occur when applying a commit to p4. When this
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happens, the default behavior ("ask") is to prompt whether to
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skip this commit and continue, or quit. This option can be used
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to bypass the prompt, causing conflicting commits to be automatically
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skipped, or to quit trying to apply commits, without prompting.
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--branch <branch>::
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After submitting, sync this named branch instead of the default
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p4/master. See the "Sync options" section above for more
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information.
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Rebase options
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~~~~~~~~~~~~~~
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These options can be used to modify 'git p4 rebase' behavior.
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--import-labels::
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Import p4 labels.
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DEPOT PATH SYNTAX
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-----------------
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The p4 depot path argument to 'git p4 sync' and 'git p4 clone' can
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be one or more space-separated p4 depot paths, with an optional
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p4 revision specifier on the end:
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"//depot/my/project"::
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Import one commit with all files in the '#head' change under that tree.
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"//depot/my/project@all"::
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Import one commit for each change in the history of that depot path.
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"//depot/my/project@1,6"::
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Import only changes 1 through 6.
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"//depot/proj1@all //depot/proj2@all"::
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Import all changes from both named depot paths into a single
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repository. Only files below these directories are included.
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There is not a subdirectory in Git for each "proj1" and "proj2".
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You must use the '--destination' option when specifying more
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than one depot path. The revision specifier must be specified
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identically on each depot path. If there are files in the
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depot paths with the same name, the path with the most recently
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updated version of the file is the one that appears in Git.
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See 'p4 help revisions' for the full syntax of p4 revision specifiers.
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CLIENT SPEC
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-----------
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The p4 client specification is maintained with the 'p4 client' command
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and contains among other fields, a View that specifies how the depot
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is mapped into the client repository. The 'clone' and 'sync' commands
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can consult the client spec when given the '--use-client-spec' option or
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when the useClientSpec variable is true. After 'git p4 clone', the
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useClientSpec variable is automatically set in the repository
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configuration file. This allows future 'git p4 submit' commands to
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work properly; the submit command looks only at the variable and does
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not have a command-line option.
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The full syntax for a p4 view is documented in 'p4 help views'. 'git p4'
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knows only a subset of the view syntax. It understands multi-line
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mappings, overlays with '+', exclusions with '-' and double-quotes
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around whitespace. Of the possible wildcards, 'git p4' only handles
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'...', and only when it is at the end of the path. 'git p4' will complain
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if it encounters an unhandled wildcard.
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Bugs in the implementation of overlap mappings exist. If multiple depot
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paths map through overlays to the same location in the repository,
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'git p4' can choose the wrong one. This is hard to solve without
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dedicating a client spec just for 'git p4'.
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The name of the client can be given to 'git p4' in multiple ways. The
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variable 'git-p4.client' takes precedence if it exists. Otherwise,
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normal p4 mechanisms of determining the client are used: environment
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variable P4CLIENT, a file referenced by P4CONFIG, or the local host name.
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BRANCH DETECTION
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----------------
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P4 does not have the same concept of a branch as Git. Instead,
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p4 organizes its content as a directory tree, where by convention
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different logical branches are in different locations in the tree.
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The 'p4 branch' command is used to maintain mappings between
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different areas in the tree, and indicate related content. 'git p4'
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can use these mappings to determine branch relationships.
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If you have a repository where all the branches of interest exist as
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subdirectories of a single depot path, you can use '--detect-branches'
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when cloning or syncing to have 'git p4' automatically find
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subdirectories in p4, and to generate these as branches in Git.
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For example, if the P4 repository structure is:
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----
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//depot/main/...
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//depot/branch1/...
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----
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And "p4 branch -o branch1" shows a View line that looks like:
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----
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//depot/main/... //depot/branch1/...
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----
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Then this 'git p4 clone' command:
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----
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git p4 clone --detect-branches //depot@all
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----
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produces a separate branch in 'refs/remotes/p4/' for //depot/main,
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called 'master', and one for //depot/branch1 called 'depot/branch1'.
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However, it is not necessary to create branches in p4 to be able to use
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them like branches. Because it is difficult to infer branch
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relationships automatically, a Git configuration setting
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'git-p4.branchList' can be used to explicitly identify branch
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relationships. It is a list of "source:destination" pairs, like a
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simple p4 branch specification, where the "source" and "destination" are
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the path elements in the p4 repository. The example above relied on the
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presence of the p4 branch. Without p4 branches, the same result will
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occur with:
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----
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git init depot
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cd depot
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git config git-p4.branchList main:branch1
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git p4 clone --detect-branches //depot@all .
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----
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PERFORMANCE
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-----------
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The fast-import mechanism used by 'git p4' creates one pack file for
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each invocation of 'git p4 sync'. Normally, Git garbage compression
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(linkgit:git-gc[1]) automatically compresses these to fewer pack files,
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but explicit invocation of 'git repack -adf' may improve performance.
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CONFIGURATION VARIABLES
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-----------------------
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The following config settings can be used to modify 'git p4' behavior.
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They all are in the 'git-p4' section.
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General variables
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~~~~~~~~~~~~~~~~~
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git-p4.user::
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User specified as an option to all p4 commands, with '-u <user>'.
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The environment variable 'P4USER' can be used instead.
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git-p4.password::
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Password specified as an option to all p4 commands, with
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'-P <password>'.
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The environment variable 'P4PASS' can be used instead.
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git-p4.port::
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Port specified as an option to all p4 commands, with
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'-p <port>'.
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The environment variable 'P4PORT' can be used instead.
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git-p4.host::
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Host specified as an option to all p4 commands, with
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'-h <host>'.
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The environment variable 'P4HOST' can be used instead.
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git-p4.client::
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Client specified as an option to all p4 commands, with
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'-c <client>', including the client spec.
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Clone and sync variables
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~~~~~~~~~~~~~~~~~~~~~~~~
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git-p4.syncFromOrigin::
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Because importing commits from other Git repositories is much faster
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than importing them from p4, a mechanism exists to find p4 changes
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first in Git remotes. If branches exist under 'refs/remote/origin/p4',
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those will be fetched and used when syncing from p4. This
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variable can be set to 'false' to disable this behavior.
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git-p4.branchUser::
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One phase in branch detection involves looking at p4 branches
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to find new ones to import. By default, all branches are
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inspected. This option limits the search to just those owned
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by the single user named in the variable.
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git-p4.branchList::
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List of branches to be imported when branch detection is
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enabled. Each entry should be a pair of branch names separated
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by a colon (:). This example declares that both branchA and
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branchB were created from main:
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+
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-------------
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git config git-p4.branchList main:branchA
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git config --add git-p4.branchList main:branchB
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-------------
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git-p4.ignoredP4Labels::
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List of p4 labels to ignore. This is built automatically as
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unimportable labels are discovered.
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git-p4.importLabels::
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Import p4 labels into git, as per --import-labels.
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git-p4.labelImportRegexp::
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Only p4 labels matching this regular expression will be imported. The
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default value is '[a-zA-Z0-9_\-.]+$'.
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git-p4.useClientSpec::
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Specify that the p4 client spec should be used to identify p4
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depot paths of interest. This is equivalent to specifying the
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option '--use-client-spec'. See the "CLIENT SPEC" section above.
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This variable is a boolean, not the name of a p4 client.
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git-p4.pathEncoding::
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Perforce keeps the encoding of a path as given by the originating OS.
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|
Git expects paths encoded as UTF-8. Use this config to tell git-p4
|
|
what encoding Perforce had used for the paths. This encoding is used
|
|
to transcode the paths to UTF-8. As an example, Perforce on Windows
|
|
often uses “cp1252” to encode path names.
|
|
|
|
git-p4.largeFileSystem::
|
|
Specify the system that is used for large (binary) files. Please note
|
|
that large file systems do not support the 'git p4 submit' command.
|
|
Only Git LFS [1] is implemented right now. Download
|
|
and install the Git LFS command line extension to use this option
|
|
and configure it like this:
|
|
+
|
|
-------------
|
|
git config git-p4.largeFileSystem GitLFS
|
|
-------------
|
|
+
|
|
[1] https://git-lfs.github.com/
|
|
|
|
git-p4.largeFileExtensions::
|
|
All files matching a file extension in the list will be processed
|
|
by the large file system. Do not prefix the extensions with '.'.
|
|
|
|
git-p4.largeFileThreshold::
|
|
All files with an uncompressed size exceeding the threshold will be
|
|
processed by the large file system. By default the threshold is
|
|
defined in bytes. Add the suffix k, m, or g to change the unit.
|
|
|
|
git-p4.largeFileCompressedThreshold::
|
|
All files with a compressed size exceeding the threshold will be
|
|
processed by the large file system. This option might slow down
|
|
your clone/sync process. By default the threshold is defined in
|
|
bytes. Add the suffix k, m, or g to change the unit.
|
|
|
|
git-p4.largeFilePush::
|
|
Boolean variable which defines if large files are automatically
|
|
pushed to a server.
|
|
|
|
Submit variables
|
|
~~~~~~~~~~~~~~~~
|
|
git-p4.detectRenames::
|
|
Detect renames. See linkgit:git-diff[1]. This can be true,
|
|
false, or a score as expected by 'git diff -M'.
|
|
|
|
git-p4.detectCopies::
|
|
Detect copies. See linkgit:git-diff[1]. This can be true,
|
|
false, or a score as expected by 'git diff -C'.
|
|
|
|
git-p4.detectCopiesHarder::
|
|
Detect copies harder. See linkgit:git-diff[1]. A boolean.
|
|
|
|
git-p4.preserveUser::
|
|
On submit, re-author changes to reflect the Git author,
|
|
regardless of who invokes 'git p4 submit'.
|
|
|
|
git-p4.allowMissingP4Users::
|
|
When 'preserveUser' is true, 'git p4' normally dies if it
|
|
cannot find an author in the p4 user map. This setting
|
|
submits the change regardless.
|
|
|
|
git-p4.skipSubmitEdit::
|
|
The submit process invokes the editor before each p4 change
|
|
is submitted. If this setting is true, though, the editing
|
|
step is skipped.
|
|
|
|
git-p4.skipSubmitEditCheck::
|
|
After editing the p4 change message, 'git p4' makes sure that
|
|
the description really was changed by looking at the file
|
|
modification time. This option disables that test.
|
|
|
|
git-p4.allowSubmit::
|
|
By default, any branch can be used as the source for a 'git p4
|
|
submit' operation. This configuration variable, if set, permits only
|
|
the named branches to be used as submit sources. Branch names
|
|
must be the short names (no "refs/heads/"), and should be
|
|
separated by commas (","), with no spaces.
|
|
|
|
git-p4.skipUserNameCheck::
|
|
If the user running 'git p4 submit' does not exist in the p4
|
|
user map, 'git p4' exits. This option can be used to force
|
|
submission regardless.
|
|
|
|
git-p4.attemptRCSCleanup::
|
|
If enabled, 'git p4 submit' will attempt to cleanup RCS keywords
|
|
($Header$, etc). These would otherwise cause merge conflicts and prevent
|
|
the submit going ahead. This option should be considered experimental at
|
|
present.
|
|
|
|
git-p4.exportLabels::
|
|
Export Git tags to p4 labels, as per --export-labels.
|
|
|
|
git-p4.labelExportRegexp::
|
|
Only p4 labels matching this regular expression will be exported. The
|
|
default value is '[a-zA-Z0-9_\-.]+$'.
|
|
|
|
git-p4.conflict::
|
|
Specify submit behavior when a conflict with p4 is found, as per
|
|
--conflict. The default behavior is 'ask'.
|
|
|
|
IMPLEMENTATION DETAILS
|
|
----------------------
|
|
* Changesets from p4 are imported using Git fast-import.
|
|
* Cloning or syncing does not require a p4 client; file contents are
|
|
collected using 'p4 print'.
|
|
* Submitting requires a p4 client, which is not in the same location
|
|
as the Git repository. Patches are applied, one at a time, to
|
|
this p4 client and submitted from there.
|
|
* Each commit imported by 'git p4' has a line at the end of the log
|
|
message indicating the p4 depot location and change number. This
|
|
line is used by later 'git p4 sync' operations to know which p4
|
|
changes are new.
|