thodg/got/lib/object_create.c

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• Hash : c6f826b4
  Author :
  Date : 2019-04-13T18:08:40
  

  better variable names in create_loose_object()

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• lib/object_create.c

• /*
   * Copyright (c) 2019 Stefan Sperling <stsp@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <sys/queue.h>
  
  #include <errno.h>
  #include <fcntl.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdint.h>
  #include <sha1.h>
  #include <unistd.h>
  #include <zlib.h>
  
  #include "got_error.h"
  #include "got_object.h"
  #include "got_repository.h"
  #include "got_opentemp.h"
  
  #include "got_lib_sha1.h"
  #include "got_lib_deflate.h"
  #include "got_lib_delta.h"
  #include "got_lib_object.h"
  #include "got_lib_lockfile.h"
  #include "got_lib_path.h"
  
  #ifndef nitems
  #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
  #endif
  
  static const struct got_error *
  create_loose_object(struct got_object_id *id, FILE *content,
      struct got_repository *repo)
  {
  	const struct got_error *err = NULL, *unlock_err = NULL;
  	char *objpath = NULL, *tmppath = NULL;
  	FILE *tmpfile = NULL;
  	struct got_lockfile *lf = NULL;
  	size_t tmplen = 0;
  
  	err = got_object_get_path(&objpath, id, repo);
  	if (err)
  		return err;
  
  	err = got_opentemp_named(&tmppath, &tmpfile, objpath);
  	if (err) {
  		char *parent_path;
  		if (!(err->code == GOT_ERR_ERRNO && errno == ENOENT))
  			goto done;
  		err = got_path_dirname(&parent_path, objpath);
  		if (err)
  			goto done;
  		err = got_path_mkdir(parent_path);
  		free(parent_path);
  		if (err)
  			goto done;
  		err = got_opentemp_named(&tmppath, &tmpfile, objpath);
  		if (err)
  			goto done;
  	}
  
  	err = got_deflate_to_file(&tmplen, content, tmpfile);
  	if (err)
  		goto done;
  
  	err = got_lockfile_lock(&lf, objpath);
  	if (err)
  		goto done;
  
  	if (rename(tmppath, objpath) != 0) {
  		err = got_error_from_errno();
  		goto done;
  	}
  	free(tmppath);
  	tmppath = NULL;
  
  	if (chmod(objpath, GOT_DEFAULT_FILE_MODE) != 0) {
  		err = got_error_from_errno();
  		goto done;
  	}
  done:
  	free(objpath);
  	if (tmppath) {
  		if (unlink(tmppath) != 0 && err == NULL)
  			err = got_error_from_errno();
  		free(tmppath);
  	}
  	if (tmpfile && fclose(tmpfile) != 0 && err == NULL)
  		err = got_error_from_errno();
  	if (lf)
  		unlock_err = got_lockfile_unlock(lf);
  	return err ? err : unlock_err;
  }
  
  const struct got_error *
  got_object_blob_create(struct got_object_id **id, const char *ondisk_path,
      struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	char *header = NULL;
  	FILE *blobfile = NULL;
  	int fd = -1;
  	struct stat sb;
  	SHA1_CTX sha1_ctx;
  	uint8_t digest[SHA1_DIGEST_LENGTH];
  	size_t headerlen = 0, n;
  
  	*id = NULL;
  
  	SHA1Init(&sha1_ctx);
  
  	fd = open(ondisk_path, O_RDONLY | O_NOFOLLOW);
  	if (fd == -1)
  		return got_error_from_errno();
  
  	if (fstat(fd, &sb) == -1) {
  		err = got_error_from_errno();
  		goto done;
  	}
  
  	if (asprintf(&header, "%s %lld", GOT_OBJ_LABEL_BLOB,
  		sb.st_size) == -1) {
  		err = got_error_from_errno();
  		goto done;
  	}
  	headerlen = strlen(header) + 1;
  	SHA1Update(&sha1_ctx, header, headerlen);
  
  	blobfile = got_opentemp();
  	if (blobfile == NULL) {
  		err = got_error_from_errno();
  		goto done;
  	}
  
  	n = fwrite(header, 1, headerlen, blobfile);
  	if (n != headerlen) {
  		err = got_ferror(blobfile, GOT_ERR_IO);
  		goto done;
  	}
  	while (1) {
  		char buf[8192];
  		ssize_t inlen;
  
  		inlen = read(fd, buf, sizeof(buf));
  		if (inlen == -1) {
  			err = got_error_from_errno();
  			goto done;
  		}
  		if (inlen == 0)
  			break; /* EOF */
  		SHA1Update(&sha1_ctx, buf, inlen);
  		n = fwrite(buf, 1, inlen, blobfile);
  		if (n != inlen) {
  			err = got_ferror(blobfile, GOT_ERR_IO);
  			goto done;
  		}
  	}
  
  	SHA1Final(digest, &sha1_ctx);
  	*id = malloc(sizeof(**id));
  	if (*id == NULL) {
  		err = got_error_from_errno();
  		goto done;
  	}
  	memcpy((*id)->sha1, digest, SHA1_DIGEST_LENGTH);
  
  	if (fflush(blobfile) != 0) {
  		err = got_error_from_errno();
  		goto done;
  	}
  	rewind(blobfile);
  
  	err = create_loose_object(*id, blobfile, repo);
  done:
  	free(header);
  	if (fd != -1 && close(fd) != 0 && err == NULL)
  		err = got_error_from_errno();
  	if (blobfile && fclose(blobfile) != 0 && err == NULL)
  		err = got_error_from_errno();
  	if (err) {
  		free(*id);
  		*id = NULL;
  	}
  	return err;
  }
  

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