thodg/libgit2/src/sysdir.h

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• Hash : 1fafead5
  Author :
  Date : 2016-07-29T12:59:42
  

  sysdir: use the standard `init` pattern Don't try to determine when sysdirs are uninitialized. Instead, simply initialize them all at `git_libgit2_init` time and never try to reinitialize, except when consumers explicitly call `git_sysdir_set`. Looking at the buffer length is especially problematic, since there may no appropriate path for that value. (For example, the Windows-specific programdata directory has no value on non-Windows machines.) Previously we would continually trying to re-lookup these values, which could get racy if two different threads are each calling `git_sysdir_get` and trying to lookup / clear the value simultaneously.

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• src/sysdir.h

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  #ifndef INCLUDE_sysdir_h__
  #define INCLUDE_sysdir_h__
  
  #include "common.h"
  #include "posix.h"
  #include "buffer.h"
  
  /**
   * Find a "global" file (i.e. one in a user's home directory).
   *
   * @param path buffer to write the full path into
   * @param filename name of file to find in the home directory
   * @return 0 if found, GIT_ENOTFOUND if not found, or -1 on other OS error
   */
  extern int git_sysdir_find_global_file(git_buf *path, const char *filename);
  
  /**
   * Find an "XDG" file (i.e. one in user's XDG config path).
   *
   * @param path buffer to write the full path into
   * @param filename name of file to find in the home directory
   * @return 0 if found, GIT_ENOTFOUND if not found, or -1 on other OS error
   */
  extern int git_sysdir_find_xdg_file(git_buf *path, const char *filename);
  
  /**
   * Find a "system" file (i.e. one shared for all users of the system).
   *
   * @param path buffer to write the full path into
   * @param filename name of file to find in the home directory
   * @return 0 if found, GIT_ENOTFOUND if not found, or -1 on other OS error
   */
  extern int git_sysdir_find_system_file(git_buf *path, const char *filename);
  
  /**
   * Find a "ProgramData" file (i.e. one in %PROGRAMDATA%)
   *
   * @param path buffer to write the full path into
   * @param filename name of file to find in the ProgramData directory
   * @return 0 if found, GIT_ENOTFOUND if not found, or -1 on other OS error
   */
  extern int git_sysdir_find_programdata_file(git_buf *path, const char *filename);
  
  /**
   * Find template directory.
   *
   * @param path buffer to write the full path into
   * @return 0 if found, GIT_ENOTFOUND if not found, or -1 on other OS error
   */
  extern int git_sysdir_find_template_dir(git_buf *path);
  
  typedef enum {
  	GIT_SYSDIR_SYSTEM = 0,
  	GIT_SYSDIR_GLOBAL = 1,
  	GIT_SYSDIR_XDG    = 2,
  	GIT_SYSDIR_PROGRAMDATA = 3,
  	GIT_SYSDIR_TEMPLATE = 4,
  	GIT_SYSDIR__MAX   = 5,
  } git_sysdir_t;
  
  /**
   * Configures global data for configuration file search paths.
   *
   * @return 0 on success, <0 on failure
   */
  extern int git_sysdir_global_init(void);
  
  /**
   * Get the search path for global/system/xdg files
   *
   * @param out pointer to git_buf containing search path
   * @param which which list of paths to return
   * @return 0 on success, <0 on failure
   */
  extern int git_sysdir_get(const git_buf **out, git_sysdir_t which);
  
  /**
   * Get search path into a preallocated buffer
   *
   * @param out String buffer to write into
   * @param outlen Size of string buffer
   * @param which Which search path to return
   * @return 0 on success, GIT_EBUFS if out is too small, <0 on other failure
   */
  
  extern int git_sysdir_get_str(char *out, size_t outlen, git_sysdir_t which);
  
  /**
   * Set search paths for global/system/xdg files
   *
   * The first occurrence of the magic string "$PATH" in the new value will
   * be replaced with the old value of the search path.
   *
   * @param which Which search path to modify
   * @param paths New search path (separated by GIT_PATH_LIST_SEPARATOR)
   * @return 0 on success, <0 on failure (allocation error)
   */
  extern int git_sysdir_set(git_sysdir_t which, const char *paths);
  
  #endif /* INCLUDE_sysdir_h__ */
  

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