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GIT-P4(1)                                        Git Manual                                        GIT-P4(1)



NAME
       git-p4 - Import from and submit to Perforce repositories

SYNOPSIS
       git p4 clone [<sync options>] [<clone options>] <p4 depot path>...
       git p4 sync [<sync options>] [<p4 depot path>...]
       git p4 rebase
       git p4 submit [<submit options>] [<master branch name>]


DESCRIPTION
       This command provides a way to interact with p4 repositories using Git.

       Create a new Git repository from an existing p4 repository using git p4 clone, giving it one or more
       p4 depot paths. Incorporate new commits from p4 changes with git p4 sync. The sync command is also
       used to include new branches from other p4 depot paths. Submit Git changes back to p4 using git p4
       submit. The command git p4 rebase does a sync plus rebases the current branch onto the updated p4
       remote branch.

EXAMPLE
          Clone a repository:

               $ git p4 clone //depot/path/project


          Do some work in the newly created Git repository:

               $ cd project
               $ vi foo.h
               $ git commit -a -m "edited foo.h"


          Update the Git repository with recent changes from p4, rebasing your work on top:

               $ git p4 rebase


          Submit your commits back to p4:

               $ git p4 submit


COMMANDS
   Clone
       Generally, git p4 clone is used to create a new Git directory from an existing p4 repository:

           $ git p4 clone //depot/path/project


       This:

        1. Creates an empty Git repository in a subdirectory called project.

        2. Imports the full contents of the head revision from the given p4 depot path into a single commit
           in the Git branch refs/remotes/p4/master.

        3. Creates a local branch, master from this remote and checks it out.

       To reproduce the entire p4 history in Git, use the @all modifier on the depot path:

           $ git p4 clone //depot/path/project@all


   Sync
       As development continues in the p4 repository, those changes can be included in the Git repository
       using:

           $ git p4 sync


       This command finds new changes in p4 and imports them as Git commits.

       P4 repositories can be added to an existing Git repository using git p4 sync too:

           $ mkdir repo-git
           $ cd repo-git
           $ git init
           $ git p4 sync //path/in/your/perforce/depot


       This imports the specified depot into refs/remotes/p4/master in an existing Git repository. The
       --branch option can be used to specify a different branch to be used for the p4 content.

       If a Git repository includes branches refs/remotes/origin/p4, these will be fetched and consulted
       first during a git p4 sync. Since importing directly from p4 is considerably slower than pulling
       changes from a Git remote, this can be useful in a multi-developer environment.

       If there are multiple branches, doing git p4 sync will automatically use the "BRANCH DETECTION"
       algorithm to try to partition new changes into the right branch. This can be overridden with the
       --branch option to specify just a single branch to update.

   Rebase
       A common working pattern is to fetch the latest changes from the p4 depot and merge them with local
       uncommitted changes. Often, the p4 repository is the ultimate location for all code, thus a rebase
       workflow makes sense. This command does git p4 sync followed by git rebase to move local commits on
       top of updated p4 changes.

           $ git p4 rebase


   Submit
       Submitting changes from a Git repository back to the p4 repository requires a separate p4 client
       workspace. This should be specified using the P4CLIENT environment variable or the Git configuration
       variable git-p4.client. The p4 client must exist, but the client root will be created and populated
       if it does not already exist.

       To submit all changes that are in the current Git branch but not in the p4/master branch, use:

           $ git p4 submit


       To specify a branch other than the current one, use:

           $ git p4 submit topicbranch


       The upstream reference is generally refs/remotes/p4/master, but can be overridden using the --origin=
       command-line option.

       The p4 changes will be created as the user invoking git p4 submit. The --preserve-user option will
       cause ownership to be modified according to the author of the Git commit. This option requires admin
       privileges in p4, which can be granted using p4 protect.

OPTIONS
   General options
       All commands except clone accept these options.

       --git-dir <dir>
           Set the GIT_DIR environment variable. See git(1).

       --verbose, -v
           Provide more progress information.

   Sync options
       These options can be used in the initial clone as well as in subsequent sync operations.

       --branch <branch>
           Import changes into given branch. If the branch starts with refs/, it will be used as is.
           Otherwise if it does not start with p4/, that prefix is added. The branch is assumed to name a
           remote tracking, but this can be modified using --import-local, or by giving a full ref name. The
           default branch is master.

           This example imports a new remote "p4/proj2" into an existing Git repository:

                   $ git init
                   $ git p4 sync --branch=refs/remotes/p4/proj2 //depot/proj2


       --detect-branches
           Use the branch detection algorithm to find new paths in p4. It is documented below in "BRANCH
           DETECTION".

       --changesfile <file>
           Import exactly the p4 change numbers listed in file, one per line. Normally, git p4 inspects the
           current p4 repository state and detects the changes it should import.

       --silent
           Do not print any progress information.

       --detect-labels
           Query p4 for labels associated with the depot paths, and add them as tags in Git. Limited
           usefulness as only imports labels associated with new changelists. Deprecated.

       --import-labels
           Import labels from p4 into Git.

       --import-local
           By default, p4 branches are stored in refs/remotes/p4/, where they will be treated as
           remote-tracking branches by git-branch(1) and other commands. This option instead puts p4
           branches in refs/heads/p4/. Note that future sync operations must specify --import-local as well
           so that they can find the p4 branches in refs/heads.

       --max-changes <n>
           Limit the number of imported changes to n. Useful to limit the amount of history when using the
           @all p4 revision specifier.

       --keep-path
           The mapping of file names from the p4 depot path to Git, by default, involves removing the entire
           depot path. With this option, the full p4 depot path is retained in Git. For example, path
           //depot/main/foo/bar.c, when imported from //depot/main/, becomes foo/bar.c. With --keep-path,
           the Git path is instead depot/main/foo/bar.c.

       --use-client-spec
           Use a client spec to find the list of interesting files in p4. See the "CLIENT SPEC" section
           below.

   Clone options
       These options can be used in an initial clone, along with the sync options described above.

       --destination <directory>
           Where to create the Git repository. If not provided, the last component in the p4 depot path is
           used to create a new directory.

       --bare
           Perform a bare clone. See git-clone(1).

       -/ <path>
           Exclude selected depot paths when cloning.

   Submit options
       These options can be used to modify git p4 submit behavior.

       --origin <commit>
           Upstream location from which commits are identified to submit to p4. By default, this is the most
           recent p4 commit reachable from HEAD.

       -M
           Detect renames. See git-diff(1). Renames will be represented in p4 using explicit move
           operations. There is no corresponding option to detect copies, but there are variables for both
           moves and copies.

       --preserve-user
           Re-author p4 changes before submitting to p4. This option requires p4 admin privileges.

       --export-labels
           Export tags from Git as p4 labels. Tags found in Git are applied to the perforce working
           directory.

       --dry-run, -n
           Show just what commits would be submitted to p4; do not change state in Git or p4.

       --prepare-p4-only
           Apply a commit to the p4 workspace, opening, adding and deleting files in p4 as for a normal
           submit operation. Do not issue the final "p4 submit", but instead print a message about how to
           submit manually or revert. This option always stops after the first (oldest) commit. Git tags are
           not exported to p4.

       --conflict=(ask|skip|quit)
           Conflicts can occur when applying a commit to p4. When this happens, the default behavior ("ask")
           is to prompt whether to skip this commit and continue, or quit. This option can be used to bypass
           the prompt, causing conflicting commits to be automatically skipped, or to quit trying to apply
           commits, without prompting.

       --branch <branch>
           After submitting, sync this named branch instead of the default p4/master. See the "Sync options"
           section above for more information.

   Rebase options
       These options can be used to modify git p4 rebase behavior.

       --import-labels
           Import p4 labels.

DEPOT PATH SYNTAX
       The p4 depot path argument to git p4 sync and git p4 clone can be one or more space-separated p4
       depot paths, with an optional p4 revision specifier on the end:

       "//depot/my/project"
           Import one commit with all files in the #head change under that tree.

       "//depot/my/project@all"
           Import one commit for each change in the history of that depot path.

       "//depot/my/project@1,6"
           Import only changes 1 through 6.

       "//depot/proj1@all //depot/proj2@all"
           Import all changes from both named depot paths into a single repository. Only files below these
           directories are included. There is not a subdirectory in Git for each "proj1" and "proj2". You
           must use the --destination option when specifying more than one depot path. The revision
           specifier must be specified identically on each depot path. If there are files in the depot paths
           with the same name, the path with the most recently updated version of the file is the one that
           appears in Git.

       See p4 help revisions for the full syntax of p4 revision specifiers.

CLIENT SPEC
       The p4 client specification is maintained with the p4 client command and contains among other fields,
       a View that specifies how the depot is mapped into the client repository. The clone and sync commands
       can consult the client spec when given the --use-client-spec option or when the useClientSpec
       variable is true. After git p4 clone, the useClientSpec variable is automatically set in the
       repository configuration file. This allows future git p4 submit commands to work properly; the submit
       command looks only at the variable and does not have a command-line option.

       The full syntax for a p4 view is documented in p4 help views. git p4 knows only a subset of the view
       syntax. It understands multi-line mappings, overlays with +, exclusions with - and double-quotes
       around whitespace. Of the possible wildcards, git p4 only handles ..., and only when it is at the end
       of the path. git p4 will complain if it encounters an unhandled wildcard.

       Bugs in the implementation of overlap mappings exist. If multiple depot paths map through overlays to
       the same location in the repository, git p4 can choose the wrong one. This is hard to solve without
       dedicating a client spec just for git p4.

       The name of the client can be given to git p4 in multiple ways. The variable git-p4.client takes
       precedence if it exists. Otherwise, normal p4 mechanisms of determining the client are used:
       environment variable P4CLIENT, a file referenced by P4CONFIG, or the local host name.

BRANCH DETECTION
       P4 does not have the same concept of a branch as Git. Instead, p4 organizes its content as a
       directory tree, where by convention different logical branches are in different locations in the
       tree. The p4 branch command is used to maintain mappings between different areas in the tree, and
       indicate related content. git p4 can use these mappings to determine branch relationships.

       If you have a repository where all the branches of interest exist as subdirectories of a single depot
       path, you can use --detect-branches when cloning or syncing to have git p4 automatically find
       subdirectories in p4, and to generate these as branches in Git.

       For example, if the P4 repository structure is:

           //depot/main/...
           //depot/branch1/...


       And "p4 branch -o branch1" shows a View line that looks like:

           //depot/main/... //depot/branch1/...


       Then this git p4 clone command:

           git p4 clone --detect-branches //depot@all


       produces a separate branch in refs/remotes/p4/ for //depot/main, called master, and one for
       //depot/branch1 called depot/branch1.

       However, it is not necessary to create branches in p4 to be able to use them like branches. Because
       it is difficult to infer branch relationships automatically, a Git configuration setting
       git-p4.branchList can be used to explicitly identify branch relationships. It is a list of
       "source:destination" pairs, like a simple p4 branch specification, where the "source" and
       "destination" are the path elements in the p4 repository. The example above relied on the presence of
       the p4 branch. Without p4 branches, the same result will occur with:

           git init depot
           cd depot
           git config git-p4.branchList main:branch1
           git p4 clone --detect-branches //depot@all .


PERFORMANCE
       The fast-import mechanism used by git p4 creates one pack file for each invocation of git p4 sync.
       Normally, Git garbage compression (git-gc(1)) automatically compresses these to fewer pack files, but
       explicit invocation of git repack -adf may improve performance.

CONFIGURATION VARIABLES
       The following config settings can be used to modify git p4 behavior. They all are in the git-p4
       section.

   General variables
       git-p4.user
           User specified as an option to all p4 commands, with -u <user>. The environment variable P4USER
           can be used instead.

       git-p4.password
           Password specified as an option to all p4 commands, with -P <password>. The environment variable
           P4PASS can be used instead.

       git-p4.port
           Port specified as an option to all p4 commands, with -p <port>. The environment variable P4PORT
           can be used instead.

       git-p4.host
           Host specified as an option to all p4 commands, with -h <host>. The environment variable P4HOST
           can be used instead.

       git-p4.client
           Client specified as an option to all p4 commands, with -c <client>, including the client spec.

   Clone and sync variables
       git-p4.syncFromOrigin
           Because importing commits from other Git repositories is much faster than importing them from p4,
           a mechanism exists to find p4 changes first in Git remotes. If branches exist under
           refs/remote/origin/p4, those will be fetched and used when syncing from p4. This variable can be
           set to false to disable this behavior.

       git-p4.branchUser
           One phase in branch detection involves looking at p4 branches to find new ones to import. By
           default, all branches are inspected. This option limits the search to just those owned by the
           single user named in the variable.

       git-p4.branchList
           List of branches to be imported when branch detection is enabled. Each entry should be a pair of
           branch names separated by a colon (:). This example declares that both branchA and branchB were
           created from main:

               git config       git-p4.branchList main:branchA
               git config --add git-p4.branchList main:branchB


       git-p4.ignoredP4Labels
           List of p4 labels to ignore. This is built automatically as unimportable labels are discovered.

       git-p4.importLabels
           Import p4 labels into git, as per --import-labels.

       git-p4.labelImportRegexp
           Only p4 labels matching this regular expression will be imported. The default value is
           [a-zA-Z_-9_\-.]+$.

       git-p4.useClientSpec
           Specify that the p4 client spec should be used to identify p4 depot paths of interest. This is
           equivalent to specifying the option --use-client-spec. See the "CLIENT SPEC" section above. This
           variable is a boolean, not the name of a p4 client.

   Submit variables
       git-p4.detectRenames
           Detect renames. See git-diff(1). This can be true, false, or a score as expected by git diff -M.

       git-p4.detectCopies
           Detect copies. See git-diff(1). This can be true, false, or a score as expected by git diff -C.

       git-p4.detectCopiesHarder
           Detect copies harder. See 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-Z_-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.



Git 1.8.3                                        05/24/2013                                        GIT-P4(1)

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