include/git2/common.h

   1 /*
   2  * Copyright (C) the libgit2 contributors. All rights reserved.
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7 #ifndef INCLUDE_git_common_h__
   8 #define INCLUDE_git_common_h__
   9
  10 #include <time.h>
  11 #include <stdlib.h>
  12
  13 #ifdef __cplusplus
  14 # define GIT_BEGIN_DECL extern "C" {
  15 # define GIT_END_DECL   }
  16 #else
  17  /** Start declarations in C mode */
  18 # define GIT_BEGIN_DECL /* empty */
  19  /** End declarations in C mode */
  20 # define GIT_END_DECL   /* empty */
  21 #endif
  22
  23 #if defined(_MSC_VER) && _MSC_VER < 1800
  24  GIT_BEGIN_DECL
  25 # include "inttypes.h"
  26  GIT_END_DECL
  27 #else
  28 # include <inttypes.h>
  29 #endif
  30
  31 /** Declare a public function exported for application use. */
  32 #if __GNUC__ >= 4
  33 # define GIT_EXTERN(type) extern \
  34                          __attribute__((visibility("default"))) \
  35                          type
  36 #elif defined(_MSC_VER)
  37 # define GIT_EXTERN(type) __declspec(dllexport) type
  38 #else
  39 # define GIT_EXTERN(type) extern type
  40 #endif
  41
  42 /** Declare a function's takes printf style arguments. */
  43 #ifdef __GNUC__
  44 # define GIT_FORMAT_PRINTF(a,b) __attribute__((format (printf, a, b)))
  45 #else
  46 # define GIT_FORMAT_PRINTF(a,b) /* empty */
  47 #endif
  48
  49 #if (defined(_WIN32)) && !defined(__CYGWIN__)
  50 #define GIT_WIN32 1
  51 #endif
  52
  53 #ifdef __amigaos4__
  54 #include <netinet/in.h>
  55 #endif
  56
  57 /**
  58  * @file git2/common.h
  59  * @brief Git common platform definitions
  60  * @defgroup git_common Git common platform definitions
  61  * @ingroup Git
  62  * @{
  63  */
  64
  65 GIT_BEGIN_DECL
  66
  67 /**
  68  * The separator used in path list strings (ie like in the PATH
  69  * environment variable). A semi-colon ";" is used on Windows, and
  70  * a colon ":" for all other systems.
  71  */
  72 #ifdef GIT_WIN32
  73 #define GIT_PATH_LIST_SEPARATOR ';'
  74 #else
  75 #define GIT_PATH_LIST_SEPARATOR ':'
  76 #endif
  77
  78 /**
  79  * The maximum length of a valid git path.
  80  */
  81 #define GIT_PATH_MAX 4096
  82
  83 /**
  84  * The string representation of the null object ID.
  85  */
  86 #define GIT_OID_HEX_ZERO "0000000000000000000000000000000000000000"
  87
  88 /**
  89  * Return the version of the libgit2 library
  90  * being currently used.
  91  *
  92  * @param major Store the major version number
  93  * @param minor Store the minor version number
  94  * @param rev Store the revision (patch) number
  95  */
  96 GIT_EXTERN(void) git_libgit2_version(int *major, int *minor, int *rev);
  97
  98 /**
  99  * Combinations of these values describe the features with which libgit2
 100  * was compiled
 101  */
 102 typedef enum {
 103         GIT_FEATURE_THREADS     = (1 << 0),
 104         GIT_FEATURE_HTTPS       = (1 << 1),
 105         GIT_FEATURE_SSH         = (1 << 2),
 106         GIT_FEATURE_NSEC        = (1 << 3),
 107 } git_feature_t;
 108
 109 /**
 110  * Query compile time options for libgit2.
 111  *
 112  * @return A combination of GIT_FEATURE_* values.
 113  *
 114  * - GIT_FEATURE_THREADS
 115  *   Libgit2 was compiled with thread support. Note that thread support is
 116  *   still to be seen as a 'work in progress' - basic object lookups are
 117  *   believed to be threadsafe, but other operations may not be.
 118  *
 119  * - GIT_FEATURE_HTTPS
 120  *   Libgit2 supports the https:// protocol. This requires the openssl
 121  *   library to be found when compiling libgit2.
 122  *
 123  * - GIT_FEATURE_SSH
 124  *   Libgit2 supports the SSH protocol for network operations. This requires
 125  *   the libssh2 library to be found when compiling libgit2
 126  */
 127 GIT_EXTERN(int) git_libgit2_features(void);
 128
 129 /**
 130  * Global library options
 131  *
 132  * These are used to select which global option to set or get and are
 133  * used in `git_libgit2_opts()`.
 134  */
 135 typedef enum {
 136         GIT_OPT_GET_MWINDOW_SIZE,
 137         GIT_OPT_SET_MWINDOW_SIZE,
 138         GIT_OPT_GET_MWINDOW_MAPPED_LIMIT,
 139         GIT_OPT_SET_MWINDOW_MAPPED_LIMIT,
 140         GIT_OPT_GET_SEARCH_PATH,
 141         GIT_OPT_SET_SEARCH_PATH,
 142         GIT_OPT_SET_CACHE_OBJECT_LIMIT,
 143         GIT_OPT_SET_CACHE_MAX_SIZE,
 144         GIT_OPT_ENABLE_CACHING,
 145         GIT_OPT_GET_CACHED_MEMORY,
 146         GIT_OPT_GET_TEMPLATE_PATH,
 147         GIT_OPT_SET_TEMPLATE_PATH,
 148         GIT_OPT_SET_SSL_CERT_LOCATIONS,
 149         GIT_OPT_SET_USER_AGENT,
 150         GIT_OPT_ENABLE_STRICT_OBJECT_CREATION,
 151 } git_libgit2_opt_t;
 152
 153 /**
 154  * Set or query a library global option
 155  *
 156  * Available options:
 157  *
 158  *      * opts(GIT_OPT_GET_MWINDOW_SIZE, size_t *):
 159  *
 160  *              > Get the maximum mmap window size
 161  *
 162  *      * opts(GIT_OPT_SET_MWINDOW_SIZE, size_t):
 163  *
 164  *              > Set the maximum mmap window size
 165  *
 166  *      * opts(GIT_OPT_GET_MWINDOW_MAPPED_LIMIT, size_t *):
 167  *
 168  *              > Get the maximum memory that will be mapped in total by the library
 169  *
 170  *      * opts(GIT_OPT_SET_MWINDOW_MAPPED_LIMIT, size_t):
 171  *
 172  *              >Set the maximum amount of memory that can be mapped at any time
 173  *              by the library
 174  *
 175  *      * opts(GIT_OPT_GET_SEARCH_PATH, int level, git_buf *buf)
 176  *
 177  *              > Get the search path for a given level of config data.  "level" must
 178  *              > be one of `GIT_CONFIG_LEVEL_SYSTEM`, `GIT_CONFIG_LEVEL_GLOBAL`,
 179  *              > `GIT_CONFIG_LEVEL_XDG`, or `GIT_CONFIG_LEVEL_PROGRAMDATA`.
 180  *              > The search path is written to the `out` buffer.
 181  *
 182  *      * opts(GIT_OPT_SET_SEARCH_PATH, int level, const char *path)
 183  *
 184  *              > Set the search path for a level of config data.  The search path
 185  *              > applied to shared attributes and ignore files, too.
 186  *              >
 187  *              > - `path` lists directories delimited by GIT_PATH_LIST_SEPARATOR.
 188  *              >   Pass NULL to reset to the default (generally based on environment
 189  *              >   variables).  Use magic path `$PATH` to include the old value
 190  *              >   of the path (if you want to prepend or append, for instance).
 191  *              >
 192  *              > - `level` must be `GIT_CONFIG_LEVEL_SYSTEM`,
 193  *              >   `GIT_CONFIG_LEVEL_GLOBAL`, `GIT_CONFIG_LEVEL_XDG`, or
 194  *              >   `GIT_CONFIG_LEVEL_PROGRAMDATA`.
 195  *
 196  *      * opts(GIT_OPT_SET_CACHE_OBJECT_LIMIT, git_otype type, size_t size)
 197  *
 198  *              > Set the maximum data size for the given type of object to be
 199  *              > considered eligible for caching in memory.  Setting to value to
 200  *              > zero means that that type of object will not be cached.
 201  *              > Defaults to 0 for GIT_OBJ_BLOB (i.e. won't cache blobs) and 4k
 202  *              > for GIT_OBJ_COMMIT, GIT_OBJ_TREE, and GIT_OBJ_TAG.
 203  *
 204  *      * opts(GIT_OPT_SET_CACHE_MAX_SIZE, ssize_t max_storage_bytes)
 205  *
 206  *              > Set the maximum total data size that will be cached in memory
 207  *              > across all repositories before libgit2 starts evicting objects
 208  *              > from the cache.  This is a soft limit, in that the library might
 209  *              > briefly exceed it, but will start aggressively evicting objects
 210  *              > from cache when that happens.  The default cache size is 256MB.
 211  *
 212  *      * opts(GIT_OPT_ENABLE_CACHING, int enabled)
 213  *
 214  *              > Enable or disable caching completely.
 215  *              >
 216  *              > Because caches are repository-specific, disabling the cache
 217  *              > cannot immediately clear all cached objects, but each cache will
 218  *              > be cleared on the next attempt to update anything in it.
 219  *
 220  *      * opts(GIT_OPT_GET_CACHED_MEMORY, ssize_t *current, ssize_t *allowed)
 221  *
 222  *              > Get the current bytes in cache and the maximum that would be
 223  *              > allowed in the cache.
 224  *
 225  *      * opts(GIT_OPT_GET_TEMPLATE_PATH, git_buf *out)
 226  *
 227  *              > Get the default template path.
 228  *              > The path is written to the `out` buffer.
 229  *
 230  *      * opts(GIT_OPT_SET_TEMPLATE_PATH, const char *path)
 231  *
 232  *              > Set the default template path.
 233  *              >
 234  *              > - `path` directory of template.
 235  *
 236  *      * opts(GIT_OPT_SET_SSL_CERT_LOCATIONS, const char *file, const char *path)
 237  *
 238  *              > Set the SSL certificate-authority locations.
 239  *              >
 240  *              > - `file` is the location of a file containing several
 241  *              >   certificates concatenated together.
 242  *              > - `path` is the location of a directory holding several
 243  *              >   certificates, one per file.
 244  *              >
 245  *              > Either parameter may be `NULL`, but not both.
 246  *
 247  *      * opts(GIT_OPT_SET_USER_AGENT, const char *user_agent)
 248  *
 249  *              > Set the value of the User-Agent header.  This value will be
 250  *              > appended to "git/1.0", for compatibility with other git clients.
 251  *              >
 252  *              > - `user_agent` is the value that will be delivered as the
 253  *              >   User-Agent header on HTTP requests.
 254  *
 255  *      * opts(GIT_OPT_ENABLE_STRICT_OBJECT_CREATION, int enabled)
 256  *
 257  *              > Enable strict input validation when creating new objects
 258  *              > to ensure that all inputs to the new objects are valid.  For
 259  *              > example, when this is enabled, the parent(s) and tree inputs
 260  *              > will be validated when creating a new commit.  This defaults
 261  *              > to disabled.
 262  *
 263  * @param option Option key
 264  * @param ... value to set the option
 265  * @return 0 on success, <0 on failure
 266  */
 267 GIT_EXTERN(int) git_libgit2_opts(int option, ...);
 268
 269 /** @} */
 270 GIT_END_DECL
 271
 272 #endif