value of the ref. A space-separated list of attributes follows
the name; unrecognized attributes are ignored. After the
complete list, outputs a blank line.
++
+If 'push' is supported this may be called as 'list for-push'
+to obtain the current refs prior to sending one or more 'push'
+commands to the helper.
+
+'option' <name> <value>::
+ Set the transport helper option <name> to <value>. Outputs a
+ single line containing one of 'ok' (option successfully set),
+ 'unsupported' (option not recognized) or 'error <msg>'
+ (option <name> is supported but <value> is not correct
+ for it). Options should be set before other commands,
+ and may how those commands behave.
++
+Supported if the helper has the "option" capability.
'fetch' <sha1> <name>::
- Fetches the given object, writing the necessary objects to the
- database. Outputs a blank line when the fetch is
- complete. Only objects which were reported in the ref list
- with a sha1 may be fetched this way.
+ Fetches the given object, writing the necessary objects
+ to the database. Fetch commands are sent in a batch, one
+ per line, and the batch is terminated with a blank line.
+ Outputs a single blank line when all fetch commands in the
+ same batch are complete. Only objects which were reported
+ in the ref list with a sha1 may be fetched this way.
++
+Optionally may output a 'lock <file>' line indicating a file under
+GIT_DIR/objects/pack which is keeping a pack until refs can be
+suitably updated.
+
Supported if the helper has the "fetch" capability.
+'push' +<src>:<dst>::
+ Pushes the given <src> commit or branch locally to the
+ remote branch described by <dst>. A batch sequence of
+ one or more push commands is terminated with a blank line.
++
+Zero or more protocol options may be entered after the last 'push'
+command, before the batch's terminating blank line.
++
+When the push is complete, outputs one or more 'ok <dst>' or
+'error <dst> <why>?' lines to indicate success or failure of
+each pushed ref. The status report output is terminated by
+a blank line. The option field <why> may be quoted in a C
+style string if it contains an LF.
++
+Supported if the helper has the "push" capability.
+
+'import' <name>::
+ Produces a fast-import stream which imports the current value
+ of the named ref. It may additionally import other refs as
+ needed to construct the history efficiently. The script writes
+ to a helper-specific private namespace. The value of the named
+ ref should be written to a location in this namespace derived
+ by applying the refspecs from the "refspec" capability to the
+ name of the ref.
++
+Supported if the helper has the "import" capability.
+
If a fatal error occurs, the program writes the error message to
stderr and exits. The caller should expect that a suitable error
message has been printed if the child closes the connection without
'fetch'::
This helper supports the 'fetch' command.
+'option'::
+ This helper supports the option command.
+
+'push'::
+ This helper supports the 'push' command.
+
+'import'::
+ This helper supports the 'import' command.
+
+'refspec' 'spec'::
+ When using the import command, expect the source ref to have
+ been written to the destination ref. The earliest applicable
+ refspec takes precedence. For example
+ "refs/heads/*:refs/svn/origin/branches/*" means that, after an
+ "import refs/heads/name", the script has written to
+ refs/svn/origin/branches/name. If this capability is used at
+ all, it must cover all refs reported by the list command; if
+ it is not used, it is effectively "*:*"
+
REF LIST ATTRIBUTES
-------------------
-None are defined yet, but the caller must accept any which are supplied.
+'for-push'::
+ The caller wants to use the ref list to prepare push
+ commands. A helper might chose to acquire the ref list by
+ opening a different type of connection to the destination.
+
+'unchanged'::
+ This ref is unchanged since the last import or fetch, although
+ the helper cannot necessarily determine what value that produced.
+
+OPTIONS
+-------
+'option verbosity' <N>::
+ Change the level of messages displayed by the helper.
+ When N is 0 the end-user has asked the process to be
+ quiet, and the helper should produce only error output.
+ N of 1 is the default level of verbosity, higher values
+ of N correspond to the number of -v flags passed on the
+ command line.
+
+'option progress' \{'true'|'false'\}::
+ Enable (or disable) progress messages displayed by the
+ transport helper during a command.
+
+'option depth' <depth>::
+ Deepen the history of a shallow repository.
+
+'option followtags' \{'true'|'false'\}::
+ If enabled the helper should automatically fetch annotated
+ tag objects if the object the tag points at was transferred
+ during the fetch command. If the tag is not fetched by
+ the helper a second fetch command will usually be sent to
+ ask for the tag specifically. Some helpers may be able to
+ use this option to avoid a second network connection.
+
+'option dry-run' \{'true'|'false'\}:
+ If true, pretend the operation completed successfully,
+ but don't actually change any repository data. For most
+ helpers this only applies to the 'push', if supported.
Documentation
-------------