object-file.h

   1 #ifndef OBJECT_FILE_H
   2 #define OBJECT_FILE_H
   3
   4 #include "git-zlib.h"
   5 #include "object.h"
   6
   7 struct index_state;
   8
   9 /*
  10  * Set this to 0 to prevent oid_object_info_extended() from fetching missing
  11  * blobs. This has a difference only if extensions.partialClone is set.
  12  *
  13  * Its default value is 1.
  14  */
  15 extern int fetch_if_missing;
  16
  17 #define HASH_WRITE_OBJECT 1
  18 #define HASH_FORMAT_CHECK 2
  19 #define HASH_RENORMALIZE  4
  20 #define HASH_SILENT 8
  21 int index_fd(struct index_state *istate, struct object_id *oid, int fd, struct stat *st, enum object_type type, const char *path, unsigned flags);
  22 int index_path(struct index_state *istate, struct object_id *oid, const char *path, struct stat *st, unsigned flags);
  23
  24 /*
  25  * Create the directory containing the named path, using care to be
  26  * somewhat safe against races. Return one of the scld_error values to
  27  * indicate success/failure. On error, set errno to describe the
  28  * problem.
  29  *
  30  * SCLD_VANISHED indicates that one of the ancestor directories of the
  31  * path existed at one point during the function call and then
  32  * suddenly vanished, probably because another process pruned the
  33  * directory while we were working.  To be robust against this kind of
  34  * race, callers might want to try invoking the function again when it
  35  * returns SCLD_VANISHED.
  36  *
  37  * safe_create_leading_directories() temporarily changes path while it
  38  * is working but restores it before returning.
  39  * safe_create_leading_directories_const() doesn't modify path, even
  40  * temporarily. Both these variants adjust the permissions of the
  41  * created directories to honor core.sharedRepository, so they are best
  42  * suited for files inside the git dir. For working tree files, use
  43  * safe_create_leading_directories_no_share() instead, as it ignores
  44  * the core.sharedRepository setting.
  45  */
  46 enum scld_error {
  47         SCLD_OK = 0,
  48         SCLD_FAILED = -1,
  49         SCLD_PERMS = -2,
  50         SCLD_EXISTS = -3,
  51         SCLD_VANISHED = -4
  52 };
  53 enum scld_error safe_create_leading_directories(char *path);
  54 enum scld_error safe_create_leading_directories_const(const char *path);
  55 enum scld_error safe_create_leading_directories_no_share(char *path);
  56
  57 int mkdir_in_gitdir(const char *path);
  58
  59 int git_open_cloexec(const char *name, int flags);
  60 #define git_open(name) git_open_cloexec(name, O_RDONLY)
  61
  62 /**
  63  * unpack_loose_header() initializes the data stream needed to unpack
  64  * a loose object header.
  65  *
  66  * Returns:
  67  *
  68  * - ULHR_OK on success
  69  * - ULHR_BAD on error
  70  * - ULHR_TOO_LONG if the header was too long
  71  *
  72  * It will only parse up to MAX_HEADER_LEN bytes unless an optional
  73  * "hdrbuf" argument is non-NULL. This is intended for use with
  74  * OBJECT_INFO_ALLOW_UNKNOWN_TYPE to extract the bad type for (error)
  75  * reporting. The full header will be extracted to "hdrbuf" for use
  76  * with parse_loose_header(), ULHR_TOO_LONG will still be returned
  77  * from this function to indicate that the header was too long.
  78  */
  79 enum unpack_loose_header_result {
  80         ULHR_OK,
  81         ULHR_BAD,
  82         ULHR_TOO_LONG,
  83 };
  84 enum unpack_loose_header_result unpack_loose_header(git_zstream *stream,
  85                                                     unsigned char *map,
  86                                                     unsigned long mapsize,
  87                                                     void *buffer,
  88                                                     unsigned long bufsiz,
  89                                                     struct strbuf *hdrbuf);
  90
  91 /**
  92  * parse_loose_header() parses the starting "<type> <len>\0" of an
  93  * object. If it doesn't follow that format -1 is returned. To check
  94  * the validity of the <type> populate the "typep" in the "struct
  95  * object_info". It will be OBJ_BAD if the object type is unknown. The
  96  * parsed <len> can be retrieved via "oi->sizep", and from there
  97  * passed to unpack_loose_rest().
  98  */
  99 struct object_info;
 100 int parse_loose_header(const char *hdr, struct object_info *oi);
 101
 102 /**
 103  * With in-core object data in "buf", rehash it to make sure the
 104  * object name actually matches "oid" to detect object corruption.
 105  *
 106  * A negative value indicates an error, usually that the OID is not
 107  * what we expected, but it might also indicate another error.
 108  */
 109 int check_object_signature(struct repository *r, const struct object_id *oid,
 110                            void *map, unsigned long size,
 111                            enum object_type type);
 112
 113 /**
 114  * A streaming version of check_object_signature().
 115  * Try reading the object named with "oid" using
 116  * the streaming interface and rehash it to do the same.
 117  */
 118 int stream_object_signature(struct repository *r, const struct object_id *oid);
 119
 120 int finalize_object_file(const char *tmpfile, const char *filename);
 121
 122 /* Helper to check and "touch" a file */
 123 int check_and_freshen_file(const char *fn, int freshen);
 124
 125 void *read_object_with_reference(struct repository *r,
 126                                  const struct object_id *oid,
 127                                  enum object_type required_type,
 128                                  unsigned long *size,
 129                                  struct object_id *oid_ret);
 130
 131 #endif /* OBJECT_FILE_H */