thodg/libgit2/examples/ls-remote.c

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• Hash : ead10785
  Author :
  Date : 2019-01-24T11:31:49
  

  examples: create common lg2 executable
  
  Inside of our networking example code, we have a git2 executable
  that acts as an entry point to all the different network
  examples. As such, it is kind of the same like the normal git(1)
  executable in that it simply arbitrates to the respective
  subcommands.
  
  Let's extend this approach and merge all examples into a single
  standalone lg2 executable. Instead of building an executable
  for all the existing examples we have, we now bundle them all
  inside of the lg2 one and let them be callable via subcommands.
  
  In the process, we can get rid of duplicated library
  initialization, deinitialization and repository discovery code.
  Instead of having each subcommand handle these on its own, we
  simply do it inside of the single main function now.
  

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• examples/ls-remote.c

• #include "common.h"
  
  static int use_remote(git_repository *repo, char *name)
  {
  	git_remote *remote = NULL;
  	int error;
  	const git_remote_head **refs;
  	size_t refs_len, i;
  	git_remote_callbacks callbacks = GIT_REMOTE_CALLBACKS_INIT;
  
  	/* Find the remote by name */
  	error = git_remote_lookup(&remote, repo, name);
  	if (error < 0) {
  		error = git_remote_create_anonymous(&remote, repo, name);
  		if (error < 0)
  			goto cleanup;
  	}
  
  	/**
  	 * Connect to the remote and call the printing function for
  	 * each of the remote references.
  	 */
  	callbacks.credentials = cred_acquire_cb;
  
  	error = git_remote_connect(remote, GIT_DIRECTION_FETCH, &callbacks, NULL, NULL);
  	if (error < 0)
  		goto cleanup;
  
  	/**
  	 * Get the list of references on the remote and print out
  	 * their name next to what they point to.
  	 */
  	if (git_remote_ls(&refs, &refs_len, remote) < 0)
  		goto cleanup;
  
  	for (i = 0; i < refs_len; i++) {
  		char oid[GIT_OID_HEXSZ + 1] = {0};
  		git_oid_fmt(oid, &refs[i]->oid);
  		printf("%s\t%s\n", oid, refs[i]->name);
  	}
  
  cleanup:
  	git_remote_free(remote);
  	return error;
  }
  
  /** Entry point for this command */
  int lg2_ls_remote(git_repository *repo, int argc, char **argv)
  {
  	int error;
  
  	if (argc < 2) {
  		fprintf(stderr, "usage: %s ls-remote <remote>\n", argv[-1]);
  		return EXIT_FAILURE;
  	}
  
  	error = use_remote(repo, argv[1]);
  
  	return error;
  }
  

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