thodg/libgit2/examples/index-pack.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/index-pack.c

• #include "common.h"
  
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #ifdef _WIN32
  # include <io.h>
  # include <Windows.h>
  
  # define open _open
  # define read _read
  # define close _close
  
  #define ssize_t unsigned int
  #else
  # include <unistd.h>
  #endif
  
  /*
   * This could be run in the main loop whilst the application waits for
   * the indexing to finish in a worker thread
   */
  static int index_cb(const git_transfer_progress *stats, void *data)
  {
  	(void)data;
  	printf("\rProcessing %d of %d", stats->indexed_objects, stats->total_objects);
  
  	return 0;
  }
  
  int lg2_index_pack(git_repository *repo, int argc, char **argv)
  {
  	git_indexer *idx;
  	git_transfer_progress stats = {0, 0};
  	int error;
  	char hash[GIT_OID_HEXSZ + 1] = {0};
  	int fd;
  	ssize_t read_bytes;
  	char buf[512];
  
  	(void)repo;
  
  	if (argc < 2) {
  		fprintf(stderr, "usage: %s index-pack <packfile>\n", argv[-1]);
  		return EXIT_FAILURE;
  	}
  
  	if (git_indexer_new(&idx, ".", 0, NULL, NULL) < 0) {
  		puts("bad idx");
  		return -1;
  	}
  
  	if ((fd = open(argv[1], 0)) < 0) {
  		perror("open");
  		return -1;
  	}
  
  	do {
  		read_bytes = read(fd, buf, sizeof(buf));
  		if (read_bytes < 0)
  			break;
  
  		if ((error = git_indexer_append(idx, buf, read_bytes, &stats)) < 0)
  			goto cleanup;
  
  		index_cb(&stats, NULL);
  	} while (read_bytes > 0);
  
  	if (read_bytes < 0) {
  		error = -1;
  		perror("failed reading");
  		goto cleanup;
  	}
  
  	if ((error = git_indexer_commit(idx, &stats)) < 0)
  		goto cleanup;
  
  	printf("\rIndexing %d of %d\n", stats.indexed_objects, stats.total_objects);
  
  	git_oid_fmt(hash, git_indexer_hash(idx));
  	puts(hash);
  
   cleanup:
  	close(fd);
  	git_indexer_free(idx);
  	return error;
  }
  

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