thodg/libgit2/src/transport.c

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• Hash : 613d5eb9
  Author :
  Date : 2012-11-28T11:42:37
  

  Push! By schu, phkelley, and congyiwu, et al

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• src/transport.c

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  #include "common.h"
  #include "git2/types.h"
  #include "git2/remote.h"
  #include "git2/net.h"
  #include "git2/transport.h"
  #include "path.h"
  
  typedef struct transport_definition {
  	char *prefix;
  	unsigned priority;
  	git_transport_cb fn;
  	void *param;
  } transport_definition;
  
  static transport_definition local_transport_definition = { "file://", 1, git_transport_local, NULL };
  static transport_definition dummy_transport_definition = { NULL, 1, git_transport_dummy, NULL };
  
  static git_smart_subtransport_definition http_subtransport_definition = { git_smart_subtransport_http, 1 };
  static git_smart_subtransport_definition git_subtransport_definition = { git_smart_subtransport_git, 0 };
  
  static transport_definition transports[] = {
  	{"git://", 1, git_transport_smart, &git_subtransport_definition},
  	{"http://", 1, git_transport_smart, &http_subtransport_definition},
  	{"https://", 1, git_transport_smart, &http_subtransport_definition},
  	{"file://", 1, git_transport_local, NULL},
  	{"git+ssh://", 1, git_transport_dummy, NULL},
  	{"ssh+git://", 1, git_transport_dummy, NULL},
  	{NULL, 0, 0}
  };
  
  #define GIT_TRANSPORT_COUNT (sizeof(transports)/sizeof(transports[0])) - 1
  
  static int transport_find_fn(const char *url, git_transport_cb *callback, void **param)
  {
  	size_t i = 0;
  	unsigned priority = 0;
  	transport_definition *definition = NULL, *definition_iter;
  
  	// First, check to see if it's an obvious URL, which a URL scheme
  	for (i = 0; i < GIT_TRANSPORT_COUNT; ++i) {
  		definition_iter = &transports[i];
  
  		if (strncasecmp(url, definition_iter->prefix, strlen(definition_iter->prefix)))
  			continue;
  
  		if (definition_iter->priority > priority)
  			definition = definition_iter;
  	}
  
  	if (!definition) {
  		/* still here? Check to see if the path points to a file on the local file system */
  		if ((git_path_exists(url) == 0) && git_path_isdir(url))
  			definition = &local_transport_definition;
  
  		/* It could be a SSH remote path. Check to see if there's a : */
  		if (strrchr(url, ':'))
  			definition = &dummy_transport_definition; /* SSH is an unsupported transport mechanism in this version of libgit2 */
  	}
  
  	if (!definition)
  		return -1;
  
  	*callback = definition->fn;
  	*param = definition->param;
  	
  	return 0;
  }
  
  /**************
   * Public API *
   **************/
  
  int git_transport_dummy(git_transport **transport, git_remote *owner, void *param)
  {
  	GIT_UNUSED(transport);
  	GIT_UNUSED(owner);
  	GIT_UNUSED(param);
  	giterr_set(GITERR_NET, "This transport isn't implemented. Sorry");
  	return -1;
  }
  
  int git_transport_new(git_transport **out, git_remote *owner, const char *url)
  {
  	git_transport_cb fn;
  	git_transport *transport;
  	void *param;
  	int error;
  
  	if (transport_find_fn(url, &fn, &param) < 0) {
  		giterr_set(GITERR_NET, "Unsupported URL protocol");
  		return -1;
  	}
  
  	error = fn(&transport, owner, param);
  	if (error < 0)
  		return error;
  
  	*out = transport;
  
  	return 0;
  }
  
  /* from remote.h */
  int git_remote_valid_url(const char *url)
  {
  	git_transport_cb fn;
  	void *param;
  
  	return !transport_find_fn(url, &fn, &param);
  }
  
  int git_remote_supported_url(const char* url)
  {
  	git_transport_cb fn;
  	void *param;
  
  	if (transport_find_fn(url, &fn, &param) < 0)
  		return 0;
  
  	return fn != &git_transport_dummy;
  }
  

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