thodg/libgit2/examples/clone.c

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• Hash : abf24a30
  Author :
  Date : 2019-06-27T15:25:17
  

  examples: avoid conversion warnings when calculating progress When computing the progress, we perform some arithmetics that are implicitly converting from `size_t` to `int`. In one case we're calclulating a percentage, so we know that it should always be in the range of [0,100] and thus we're fine. In the other case we convert from bytes to kilobytes -- this should be stored in a `size_t` to avoid loss of precision, even though it probably won't matter due to limited download rates.

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• examples/clone.c

• #include "common.h"
  
  typedef struct progress_data {
  	git_indexer_progress fetch_progress;
  	size_t completed_steps;
  	size_t total_steps;
  	const char *path;
  } progress_data;
  
  static void print_progress(const progress_data *pd)
  {
  	int network_percent = pd->fetch_progress.total_objects > 0 ?
  		(100*pd->fetch_progress.received_objects) / pd->fetch_progress.total_objects :
  		0;
  	int index_percent = pd->fetch_progress.total_objects > 0 ?
  		(100*pd->fetch_progress.indexed_objects) / pd->fetch_progress.total_objects :
  		0;
  
  	int checkout_percent = pd->total_steps > 0
  		? (int)((100 * pd->completed_steps) / pd->total_steps)
  		: 0;
  	size_t kbytes = pd->fetch_progress.received_bytes / 1024;
  
  	if (pd->fetch_progress.total_objects &&
  		pd->fetch_progress.received_objects == pd->fetch_progress.total_objects) {
  		printf("Resolving deltas %d/%d\r",
  		       pd->fetch_progress.indexed_deltas,
  		       pd->fetch_progress.total_deltas);
  	} else {
  		printf("net %3d%% (%4"PRIuZ" kb, %5d/%5d)  /  idx %3d%% (%5d/%5d)  /  chk %3d%% (%4" PRIuZ "/%4" PRIuZ ") %s\n",
  		   network_percent, kbytes,
  		   pd->fetch_progress.received_objects, pd->fetch_progress.total_objects,
  		   index_percent, pd->fetch_progress.indexed_objects, pd->fetch_progress.total_objects,
  		   checkout_percent,
  		   pd->completed_steps, pd->total_steps,
  		   pd->path);
  	}
  }
  
  static int sideband_progress(const char *str, int len, void *payload)
  {
  	(void)payload; /* unused */
  
  	printf("remote: %.*s", len, str);
  	fflush(stdout);
  	return 0;
  }
  
  static int fetch_progress(const git_indexer_progress *stats, void *payload)
  {
  	progress_data *pd = (progress_data*)payload;
  	pd->fetch_progress = *stats;
  	print_progress(pd);
  	return 0;
  }
  static void checkout_progress(const char *path, size_t cur, size_t tot, void *payload)
  {
  	progress_data *pd = (progress_data*)payload;
  	pd->completed_steps = cur;
  	pd->total_steps = tot;
  	pd->path = path;
  	print_progress(pd);
  }
  
  
  int lg2_clone(git_repository *repo, int argc, char **argv)
  {
  	progress_data pd = {{0}};
  	git_repository *cloned_repo = NULL;
  	git_clone_options clone_opts = GIT_CLONE_OPTIONS_INIT;
  	git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
  	const char *url = argv[1];
  	const char *path = argv[2];
  	int error;
  
  	(void)repo; /* unused */
  
  	/* Validate args */
  	if (argc < 3) {
  		printf ("USAGE: %s <url> <path>\n", argv[0]);
  		return -1;
  	}
  
  	/* Set up options */
  	checkout_opts.checkout_strategy = GIT_CHECKOUT_SAFE;
  	checkout_opts.progress_cb = checkout_progress;
  	checkout_opts.progress_payload = &pd;
  	clone_opts.checkout_opts = checkout_opts;
  	clone_opts.fetch_opts.callbacks.sideband_progress = sideband_progress;
  	clone_opts.fetch_opts.callbacks.transfer_progress = &fetch_progress;
  	clone_opts.fetch_opts.callbacks.credentials = cred_acquire_cb;
  	clone_opts.fetch_opts.callbacks.payload = &pd;
  
  	/* Do the clone */
  	error = git_clone(&cloned_repo, url, path, &clone_opts);
  	printf("\n");
  	if (error != 0) {
  		const git_error *err = git_error_last();
  		if (err) printf("ERROR %d: %s\n", err->klass, err->message);
  		else printf("ERROR %d: no detailed info\n", error);
  	}
  	else if (cloned_repo) git_repository_free(cloned_repo);
  	return error;
  }
  

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