thodg/got/lib/got_file_index_priv.h

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• Hash : 422a2f50
  Author :
  Date : 2018-03-09T21:44:46
  

  file index path padding is only needed on disk

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• lib/got_file_index_priv.h

• /*
   * Copyright (c) 2018 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.
   */
  
  /*
   * State information for a tracked file in a work tree.
   * When written to disk, multi-byte fields are written in big-endian.
   * Some fields are based on results from stat(2). These are only used in
   * order to detect modifications made to on-disk files, they are never
   * applied back to the filesystem.
   */
  struct got_file_index_entry {
  	TAILQ_ENTRY(, got_file_index_entry) entry;
  	uint64_t ctime_sec;
  	uint64_t ctime_nsec;
  	uint64_t mtime_sec;
  	uint64_t mtime_nsec;
  	uint32_t uid;
  	uint32_t gid;
  	/*
  	 * On-disk size is truncated to the lower 32 bits.
  	 * The value is only used to check for modifications anyway.
  	 */
  	uint32_t size;
  	uint16_t mode;
  #define GOT_INDEX_ENTRY_MODE_OBJ_TYPE	0x000f
  #define GOT_INDEX_ENTRY_MODE_PERMS	0xff10
  
  	/* SHA1 of corresponding blob in repository. */
  	uint8_t blob_sha1[SHA1_DIGEST_LENGTH];
  
  	uint32_t flags;
  #define GOT_INDEX_ENTRY_F_PATH_LEN	0x00000fff
  #define GOT_INDEX_ENTRY_F_STAGE		0x00003000
  #define GOT_INDEX_ENTRY_F_EXTENDED	0x00004000
  #define GOT_INDEX_ENTRY_F_ASSUME_VALID	0x00008000
  
  	/*
  	 * UNIX-style path, relative to work tree root.
  	 * Variable length, and NUL-padded to a multiple of 8 on disk.
  	 */
  	const char *path;
  };
  
  /* "Stages" of a file afflicted by a 3-way merge conflict. */
  #define GOT_INDEX_ENTRY_STAGE_MERGED	0
  #define GOT_INDEX_ENTRY_STAGE_ANCESTOR	1
  #define GOT_INDEX_ENTRY_STAGE_OURS	2
  #define GOT_INDEX_ENTRY_STAGE_THEIRS	3
  
  /* On-disk file index header structure. */
  struct got_file_index_hdr {
  	uint32_t signature;	/* big-endian on disk */
  	uint32_t version;	/* big-endian on disk */
  	uint32_t nentries;	/* big-endian on disk */
  	TAILQ_HEAD(, got_file_index_entry) entries;
  	uint8_t sha1[SHA1_DIGEST_LENGTH]; /* checksum of above on-disk data */
  };
  

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