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248 lines
9.5 KiB
248 lines
9.5 KiB
git-remote-helpers(1) |
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===================== |
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NAME |
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---- |
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git-remote-helpers - Helper programs to interact with remote repositories |
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SYNOPSIS |
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-------- |
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'git remote-<transport>' <repository> [<URL>] |
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DESCRIPTION |
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----------- |
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Remote helper programs are normally not used directly by end users, |
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but they are invoked by git when it needs to interact with remote |
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repositories git does not support natively. A given helper will |
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implement a subset of the capabilities documented here. When git |
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needs to interact with a repository using a remote helper, it spawns |
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the helper as an independent process, sends commands to the helper's |
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standard input, and expects results from the helper's standard |
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output. Because a remote helper runs as an independent process from |
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git, there is no need to re-link git to add a new helper, nor any |
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need to link the helper with the implementation of git. |
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Every helper must support the "capabilities" command, which git will |
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use to determine what other commands the helper will accept. Other |
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commands generally concern facilities like discovering and updating |
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remote refs, transporting objects between the object database and |
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the remote repository, and updating the local object store. |
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Helpers supporting the 'fetch' capability can discover refs from the |
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remote repository and transfer objects reachable from those refs to |
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the local object store. Helpers supporting the 'push' capability can |
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transfer local objects to the remote repository and update remote refs. |
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Git comes with a "curl" family of remote helpers, that handle various |
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transport protocols, such as 'git-remote-http', 'git-remote-https', |
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'git-remote-ftp' and 'git-remote-ftps'. They implement the capabilities |
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'fetch', 'option', and 'push'. |
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INVOCATION |
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---------- |
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Remote helper programs are invoked with one or (optionally) two |
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arguments. The first argument specifies a remote repository as in git; |
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it is either the name of a configured remote or a URL. The second |
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argument specifies a URL; it is usually of the form |
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'<transport>://<address>', but any arbitrary string is possible. |
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When git encounters a URL of the form '<transport>://<address>', where |
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'<transport>' is a protocol that it cannot handle natively, it |
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automatically invokes 'git remote-<transport>' with the full URL as |
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the second argument. If such a URL is encountered directly on the |
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command line, the first argument is the same as the second, and if it |
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is encountered in a configured remote, the first argument is the name |
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of that remote. |
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A URL of the form '<transport>::<address>' explicitly instructs git to |
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invoke 'git remote-<transport>' with '<address>' as the second |
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argument. If such a URL is encountered directly on the command line, |
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the first argument is '<address>', and if it is encountered in a |
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configured remote, the first argument is the name of that remote. |
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Additionally, when a configured remote has 'remote.<name>.vcs' set to |
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'<transport>', git explicitly invokes 'git remote-<transport>' with |
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'<name>' as the first argument. If set, the second argument is |
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'remote.<name>.url'; otherwise, the second argument is omitted. |
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COMMANDS |
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-------- |
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Commands are given by the caller on the helper's standard input, one per line. |
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'capabilities':: |
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Lists the capabilities of the helper, one per line, ending |
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with a blank line. Each capability may be preceded with '*', |
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which marks them mandatory for git version using the remote |
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helper to understand (unknown mandatory capability is fatal |
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error). |
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'list':: |
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Lists the refs, one per line, in the format "<value> <name> |
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[<attr> ...]". The value may be a hex sha1 hash, "@<dest>" for |
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a symref, or "?" to indicate that the helper could not get the |
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value of the ref. A space-separated list of attributes follows |
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the name; unrecognized attributes are ignored. The list ends |
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with a blank line. |
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+ |
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If 'push' is supported this may be called as 'list for-push' |
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to obtain the current refs prior to sending one or more 'push' |
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commands to the helper. |
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'option' <name> <value>:: |
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Sets the transport helper option <name> to <value>. Outputs a |
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single line containing one of 'ok' (option successfully set), |
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'unsupported' (option not recognized) or 'error <msg>' |
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(option <name> is supported but <value> is not valid |
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for it). Options should be set before other commands, |
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and may influence the behavior of those commands. |
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+ |
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Supported if the helper has the "option" capability. |
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'fetch' <sha1> <name>:: |
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Fetches the given object, writing the necessary objects |
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to the database. Fetch commands are sent in a batch, one |
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per line, terminated with a blank line. |
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Outputs a single blank line when all fetch commands in the |
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same batch are complete. Only objects which were reported |
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in the ref list with a sha1 may be fetched this way. |
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+ |
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Optionally may output a 'lock <file>' line indicating a file under |
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GIT_DIR/objects/pack which is keeping a pack until refs can be |
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suitably updated. |
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+ |
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Supported if the helper has the "fetch" capability. |
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'push' +<src>:<dst>:: |
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Pushes the given local <src> commit or branch to the |
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remote branch described by <dst>. A batch sequence of |
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one or more push commands is terminated with a blank line. |
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+ |
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Zero or more protocol options may be entered after the last 'push' |
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command, before the batch's terminating blank line. |
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+ |
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When the push is complete, outputs one or more 'ok <dst>' or |
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'error <dst> <why>?' lines to indicate success or failure of |
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each pushed ref. The status report output is terminated by |
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a blank line. The option field <why> may be quoted in a C |
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style string if it contains an LF. |
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+ |
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Supported if the helper has the "push" capability. |
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'import' <name>:: |
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Produces a fast-import stream which imports the current value |
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of the named ref. It may additionally import other refs as |
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needed to construct the history efficiently. The script writes |
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to a helper-specific private namespace. The value of the named |
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ref should be written to a location in this namespace derived |
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by applying the refspecs from the "refspec" capability to the |
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name of the ref. |
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+ |
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Especially useful for interoperability with a foreign versioning |
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system. |
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+ |
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Supported if the helper has the "import" capability. |
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'connect' <service>:: |
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Connects to given service. Standard input and standard output |
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of helper are connected to specified service (git prefix is |
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included in service name so e.g. fetching uses 'git-upload-pack' |
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as service) on remote side. Valid replies to this command are |
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empty line (connection established), 'fallback' (no smart |
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transport support, fall back to dumb transports) and just |
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exiting with error message printed (can't connect, don't |
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bother trying to fall back). After line feed terminating the |
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positive (empty) response, the output of service starts. After |
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the connection ends, the remote helper exits. |
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+ |
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Supported if the helper has the "connect" capability. |
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If a fatal error occurs, the program writes the error message to |
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stderr and exits. The caller should expect that a suitable error |
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message has been printed if the child closes the connection without |
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completing a valid response for the current command. |
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Additional commands may be supported, as may be determined from |
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capabilities reported by the helper. |
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CAPABILITIES |
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------------ |
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'fetch':: |
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'option':: |
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'push':: |
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'import':: |
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'connect':: |
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This helper supports the corresponding command with the same name. |
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'refspec' 'spec':: |
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When using the import command, expect the source ref to have |
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been written to the destination ref. The earliest applicable |
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refspec takes precedence. For example |
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"refs/heads/*:refs/svn/origin/branches/*" means that, after an |
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"import refs/heads/name", the script has written to |
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refs/svn/origin/branches/name. If this capability is used at |
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all, it must cover all refs reported by the list command; if |
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it is not used, it is effectively "*:*" |
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REF LIST ATTRIBUTES |
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------------------- |
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'for-push':: |
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The caller wants to use the ref list to prepare push |
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commands. A helper might chose to acquire the ref list by |
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opening a different type of connection to the destination. |
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'unchanged':: |
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This ref is unchanged since the last import or fetch, although |
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the helper cannot necessarily determine what value that produced. |
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OPTIONS |
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------- |
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'option verbosity' <N>:: |
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Changes the verbosity of messages displayed by the helper. |
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A value of 0 for N means that processes operate |
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quietly, and the helper produces only error output. |
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1 is the default level of verbosity, and higher values |
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of N correspond to the number of -v flags passed on the |
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command line. |
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'option progress' \{'true'|'false'\}:: |
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Enables (or disables) progress messages displayed by the |
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transport helper during a command. |
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'option depth' <depth>:: |
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Deepens the history of a shallow repository. |
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'option followtags' \{'true'|'false'\}:: |
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If enabled the helper should automatically fetch annotated |
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tag objects if the object the tag points at was transferred |
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during the fetch command. If the tag is not fetched by |
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the helper a second fetch command will usually be sent to |
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ask for the tag specifically. Some helpers may be able to |
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use this option to avoid a second network connection. |
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'option dry-run' \{'true'|'false'\}: |
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If true, pretend the operation completed successfully, |
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but don't actually change any repository data. For most |
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helpers this only applies to the 'push', if supported. |
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'option servpath <c-style-quoted-path>':: |
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Sets service path (--upload-pack, --receive-pack etc.) for |
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next connect. Remote helper may support this option, but |
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must not rely on this option being set before |
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connect request occurs. |
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SEE ALSO |
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-------- |
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linkgit:git-remote[1] |
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Documentation |
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------------- |
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Documentation by Daniel Barkalow and Ilari Liusvaara |
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GIT |
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--- |
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Part of the linkgit:git[1] suite
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