cache.h

   1 #ifndef CACHE_H
   2 #define CACHE_H
   3
   4 #include "git-compat-util.h"
   5
   6 #include SHA1_HEADER
   7 #include <zlib.h>
   8
   9 #if ZLIB_VERNUM < 0x1200
  10 #define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
  11 #endif
  12
  13 #if defined(DT_UNKNOWN) && !NO_D_TYPE_IN_DIRENT
  14 #define DTYPE(de)       ((de)->d_type)
  15 #else
  16 #undef DT_UNKNOWN
  17 #undef DT_DIR
  18 #undef DT_REG
  19 #undef DT_LNK
  20 #define DT_UNKNOWN      0
  21 #define DT_DIR          1
  22 #define DT_REG          2
  23 #define DT_LNK          3
  24 #define DTYPE(de)       DT_UNKNOWN
  25 #endif
  26
  27 /*
  28  * Intensive research over the course of many years has shown that
  29  * port 9418 is totally unused by anything else. Or
  30  *
  31  *      Your search - "port 9418" - did not match any documents.
  32  *
  33  * as www.google.com puts it.
  34  *
  35  * This port has been properly assigned for git use by IANA:
  36  * git (Assigned-9418) [I06-050728-0001].
  37  *
  38  *      git  9418/tcp   git pack transfer service
  39  *      git  9418/udp   git pack transfer service
  40  *
  41  * with Linus Torvalds <torvalds@osdl.org> as the point of
  42  * contact. September 2005.
  43  *
  44  * See http://www.iana.org/assignments/port-numbers
  45  */
  46 #define DEFAULT_GIT_PORT 9418
  47
  48 /*
  49  * Basic data structures for the directory cache
  50  */
  51
  52 #define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
  53 struct cache_header {
  54         unsigned int hdr_signature;
  55         unsigned int hdr_version;
  56         unsigned int hdr_entries;
  57 };
  58
  59 /*
  60  * The "cache_time" is just the low 32 bits of the
  61  * time. It doesn't matter if it overflows - we only
  62  * check it for equality in the 32 bits we save.
  63  */
  64 struct cache_time {
  65         unsigned int sec;
  66         unsigned int nsec;
  67 };
  68
  69 /*
  70  * dev/ino/uid/gid/size are also just tracked to the low 32 bits
  71  * Again - this is just a (very strong in practice) heuristic that
  72  * the inode hasn't changed.
  73  *
  74  * We save the fields in big-endian order to allow using the
  75  * index file over NFS transparently.
  76  */
  77 struct cache_entry {
  78         struct cache_time ce_ctime;
  79         struct cache_time ce_mtime;
  80         unsigned int ce_dev;
  81         unsigned int ce_ino;
  82         unsigned int ce_mode;
  83         unsigned int ce_uid;
  84         unsigned int ce_gid;
  85         unsigned int ce_size;
  86         unsigned char sha1[20];
  87         unsigned short ce_flags;
  88         char name[FLEX_ARRAY]; /* more */
  89 };
  90
  91 #define CE_NAMEMASK  (0x0fff)
  92 #define CE_STAGEMASK (0x3000)
  93 #define CE_UPDATE    (0x4000)
  94 #define CE_STAGESHIFT 12
  95
  96 #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
  97 #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
  98 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
  99 #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
 100
 101 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 102 static inline unsigned int create_ce_mode(unsigned int mode)
 103 {
 104         if (S_ISLNK(mode))
 105                 return htonl(S_IFLNK);
 106         return htonl(S_IFREG | ce_permissions(mode));
 107 }
 108
 109 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 110
 111 extern struct cache_entry **active_cache;
 112 extern unsigned int active_nr, active_alloc, active_cache_changed;
 113
 114 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 115 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 116 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 117 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 118 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 119
 120 extern char *get_git_dir(void);
 121 extern char *get_object_directory(void);
 122 extern char *get_refs_directory(void);
 123 extern char *get_index_file(void);
 124 extern char *get_graft_file(void);
 125
 126 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 127
 128 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 129 extern const char *setup_git_directory_gently(int *);
 130 extern const char *setup_git_directory(void);
 131 extern const char *prefix_path(const char *prefix, int len, const char *path);
 132 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 133
 134 #define alloc_nr(x) (((x)+16)*3/2)
 135
 136 /* Initialize and use the cache information */
 137 extern int read_cache(void);
 138 extern int write_cache(int newfd, struct cache_entry **cache, int entries);
 139 extern int cache_name_pos(const char *name, int namelen);
 140 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 141 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 142 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 143 extern int add_cache_entry(struct cache_entry *ce, int option);
 144 extern int remove_cache_entry_at(int pos);
 145 extern int remove_file_from_cache(const char *path);
 146 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 147 extern int ce_match_stat(struct cache_entry *ce, struct stat *st);
 148 extern int ce_modified(struct cache_entry *ce, struct stat *st);
 149 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 150 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type);
 151 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 152 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 153 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 154
 155 struct cache_file {
 156         struct cache_file *next;
 157         char lockfile[PATH_MAX];
 158 };
 159 extern int hold_index_file_for_update(struct cache_file *, const char *path);
 160 extern int commit_index_file(struct cache_file *);
 161 extern void rollback_index_file(struct cache_file *);
 162
 163 extern int trust_executable_bit;
 164 extern int only_use_symrefs;
 165 extern int diff_rename_limit_default;
 166 extern int shared_repository;
 167
 168 #define GIT_REPO_VERSION 0
 169 extern int repository_format_version;
 170 extern int check_repository_format(void);
 171
 172 #define MTIME_CHANGED   0x0001
 173 #define CTIME_CHANGED   0x0002
 174 #define OWNER_CHANGED   0x0004
 175 #define MODE_CHANGED    0x0008
 176 #define INODE_CHANGED   0x0010
 177 #define DATA_CHANGED    0x0020
 178 #define TYPE_CHANGED    0x0040
 179
 180 /* Return a statically allocated filename matching the sha1 signature */
 181 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 182 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 183 extern char *sha1_file_name(const unsigned char *sha1);
 184 extern char *sha1_pack_name(const unsigned char *sha1);
 185 extern char *sha1_pack_index_name(const unsigned char *sha1);
 186 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 187 extern const unsigned char null_sha1[20];
 188
 189 int git_mkstemp(char *path, size_t n, const char *template);
 190
 191 int adjust_shared_perm(const char *path);
 192 int safe_create_leading_directories(char *path);
 193 char *safe_strncpy(char *, const char *, size_t);
 194 char *enter_repo(char *path, int strict);
 195
 196 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 197 extern int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size);
 198 extern int parse_sha1_header(char *hdr, char *type, unsigned long *sizep);
 199 extern int sha1_object_info(const unsigned char *, char *, unsigned long *);
 200 extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
 201 extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
 202 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 203 extern char *write_sha1_file_prepare(void *buf,
 204                                      unsigned long len,
 205                                      const char *type,
 206                                      unsigned char *sha1,
 207                                      unsigned char *hdr,
 208                                      int *hdrlen);
 209
 210 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 211
 212 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 213                               size_t bufsize, size_t *bufposn);
 214 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 215 extern int move_temp_to_file(const char *tmpfile, char *filename);
 216
 217 extern int has_sha1_pack(const unsigned char *sha1);
 218 extern int has_sha1_file(const unsigned char *sha1);
 219
 220 extern int has_pack_file(const unsigned char *sha1);
 221 extern int has_pack_index(const unsigned char *sha1);
 222
 223 /* Convert to/from hex/sha1 representation */
 224 #define MINIMUM_ABBREV 4
 225 #define DEFAULT_ABBREV 7
 226
 227 extern int get_sha1(const char *str, unsigned char *sha1);
 228 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 229 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 230 extern int read_ref(const char *filename, unsigned char *sha1);
 231 extern const char *resolve_ref(const char *path, unsigned char *sha1, int);
 232 extern int create_symref(const char *git_HEAD, const char *refs_heads_master);
 233 extern int validate_symref(const char *git_HEAD);
 234
 235 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 236 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 237
 238 extern void *read_object_with_reference(const unsigned char *sha1,
 239                                         const char *required_type,
 240                                         unsigned long *size,
 241                                         unsigned char *sha1_ret);
 242
 243 const char *show_date(unsigned long time, int timezone);
 244 int parse_date(const char *date, char *buf, int bufsize);
 245 void datestamp(char *buf, int bufsize);
 246 unsigned long approxidate(const char *);
 247
 248 extern int setup_ident(void);
 249 extern const char *git_author_info(void);
 250 extern const char *git_committer_info(void);
 251
 252 struct checkout {
 253         const char *base_dir;
 254         int base_dir_len;
 255         unsigned force:1,
 256                  quiet:1,
 257                  not_new:1,
 258                  refresh_cache:1;
 259 };
 260
 261 extern int checkout_entry(struct cache_entry *ce, struct checkout *state);
 262
 263 extern struct alternate_object_database {
 264         struct alternate_object_database *next;
 265         char *name;
 266         char base[FLEX_ARRAY]; /* more */
 267 } *alt_odb_list;
 268 extern void prepare_alt_odb(void);
 269
 270 extern struct packed_git {
 271         struct packed_git *next;
 272         unsigned long index_size;
 273         unsigned long pack_size;
 274         unsigned int *index_base;
 275         void *pack_base;
 276         unsigned int pack_last_used;
 277         unsigned int pack_use_cnt;
 278         int pack_local;
 279         unsigned char sha1[20];
 280         /* something like ".git/objects/pack/xxxxx.pack" */
 281         char pack_name[FLEX_ARRAY]; /* more */
 282 } *packed_git;
 283
 284 struct pack_entry {
 285         unsigned int offset;
 286         unsigned char sha1[20];
 287         struct packed_git *p;
 288 };
 289
 290 struct ref {
 291         struct ref *next;
 292         unsigned char old_sha1[20];
 293         unsigned char new_sha1[20];
 294         unsigned char force;
 295         struct ref *peer_ref; /* when renaming */
 296         char name[FLEX_ARRAY]; /* more */
 297 };
 298
 299 extern int git_connect(int fd[2], char *url, const char *prog);
 300 extern int finish_connect(pid_t pid);
 301 extern int path_match(const char *path, int nr, char **match);
 302 extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 303                       int nr_refspec, char **refspec, int all);
 304 extern int get_ack(int fd, unsigned char *result_sha1);
 305 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, int ignore_funny);
 306 extern int server_supports(const char *feature);
 307
 308 extern struct packed_git *parse_pack_index(unsigned char *sha1);
 309 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 310                                                 char *idx_path);
 311
 312 extern void prepare_packed_git(void);
 313 extern void install_packed_git(struct packed_git *pack);
 314
 315 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 316                                          struct packed_git *packs);
 317
 318 extern int use_packed_git(struct packed_git *);
 319 extern void unuse_packed_git(struct packed_git *);
 320 extern struct packed_git *add_packed_git(char *, int, int);
 321 extern int num_packed_objects(const struct packed_git *p);
 322 extern int nth_packed_object_sha1(const struct packed_git *, int, unsigned char*);
 323 extern int find_pack_entry_one(const unsigned char *, struct pack_entry *, struct packed_git *);
 324 extern void *unpack_entry_gently(struct pack_entry *, char *, unsigned long *);
 325 extern void packed_object_info_detail(struct pack_entry *, char *, unsigned long *, unsigned long *, int *, unsigned char *);
 326
 327 /* Dumb servers support */
 328 extern int update_server_info(int);
 329
 330 typedef int (*config_fn_t)(const char *, const char *);
 331 extern int git_default_config(const char *, const char *);
 332 extern int git_config_from_file(config_fn_t fn, const char *);
 333 extern int git_config(config_fn_t fn);
 334 extern int git_config_int(const char *, const char *);
 335 extern int git_config_bool(const char *, const char *);
 336 extern int git_config_set(const char *, const char *);
 337 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 338 extern int check_repository_format_version(const char *var, const char *value);
 339
 340 #define MAX_GITNAME (1000)
 341 extern char git_default_email[MAX_GITNAME];
 342 extern char git_default_name[MAX_GITNAME];
 343
 344 #define MAX_ENCODING_LENGTH 64
 345 extern char git_commit_encoding[MAX_ENCODING_LENGTH];
 346
 347 extern int copy_fd(int ifd, int ofd);
 348
 349 /* Finish off pack transfer receiving end */
 350 extern int receive_unpack_pack(int fd[2], const char *me, int quiet);
 351 extern int receive_keep_pack(int fd[2], const char *me);
 352
 353 #endif /* CACHE_H */