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This involves also adapting oid_object_info_extended and a some internal functions that are used to implement these. It all has to happen in one patch, because of a single recursive chain of calls visits all these functions. oid_object_info_extended is also used in partial clones, which allow fetching missing objects. As this series will not add the repository struct to the transport code and fetch_object(), add a TODO note and omit fetching if a user tries to use a partial clone in a repository other than the_repository. Among the functions modified to handle arbitrary repositories, unpack_entry() is one of them. Note that it still references the globals "delta_base_cache" and "delta_base_cached", but those are safe to be referenced (the former is indexed partly by "struct packed_git *", which is repo-specific, and the latter is only used to limit the size of the former as an optimization). Helped-by: Brandon Williams <bmwill@google.com> Helped-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Stefan Beller <sbeller@google.com> Reviewed-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
168 lines
6.0 KiB
C
168 lines
6.0 KiB
C
#ifndef PACKFILE_H
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#define PACKFILE_H
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#include "oidset.h"
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/*
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* Generate the filename to be used for a pack file with checksum "sha1" and
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* extension "ext". The result is written into the strbuf "buf", overwriting
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* any existing contents. A pointer to buf->buf is returned as a convenience.
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*
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* Example: odb_pack_name(out, sha1, "idx") => ".git/objects/pack/pack-1234..idx"
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*/
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extern char *odb_pack_name(struct strbuf *buf, const unsigned char *sha1, const char *ext);
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/*
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* Return the name of the (local) packfile with the specified sha1 in
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* its name. The return value is a pointer to memory that is
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* overwritten each time this function is called.
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*/
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extern char *sha1_pack_name(const unsigned char *sha1);
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/*
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* Return the name of the (local) pack index file with the specified
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* sha1 in its name. The return value is a pointer to memory that is
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* overwritten each time this function is called.
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*/
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extern char *sha1_pack_index_name(const unsigned char *sha1);
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extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
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/* A hook to report invalid files in pack directory */
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#define PACKDIR_FILE_PACK 1
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#define PACKDIR_FILE_IDX 2
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#define PACKDIR_FILE_GARBAGE 4
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extern void (*report_garbage)(unsigned seen_bits, const char *path);
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extern void reprepare_packed_git(struct repository *r);
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extern void install_packed_git(struct repository *r, struct packed_git *pack);
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struct packed_git *get_packed_git(struct repository *r);
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struct list_head *get_packed_git_mru(struct repository *r);
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/*
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* Give a rough count of objects in the repository. This sacrifices accuracy
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* for speed.
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*/
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unsigned long approximate_object_count(void);
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extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
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struct packed_git *packs);
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extern void pack_report(void);
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/*
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* mmap the index file for the specified packfile (if it is not
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* already mmapped). Return 0 on success.
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*/
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extern int open_pack_index(struct packed_git *);
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/*
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* munmap the index file for the specified packfile (if it is
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* currently mmapped).
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*/
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extern void close_pack_index(struct packed_git *);
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extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
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extern void close_pack_windows(struct packed_git *);
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extern void close_all_packs(struct raw_object_store *o);
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extern void unuse_pack(struct pack_window **);
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extern void clear_delta_base_cache(void);
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extern struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
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/*
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* Make sure that a pointer access into an mmap'd index file is within bounds,
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* and can provide at least 8 bytes of data.
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*
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* Note that this is only necessary for variable-length segments of the file
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* (like the 64-bit extended offset table), as we compare the size to the
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* fixed-length parts when we open the file.
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*/
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extern void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
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/*
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* Perform binary search on a pack-index for a given oid. Packfile is expected to
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* have a valid pack-index.
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*
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* See 'bsearch_hash' for more information.
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*/
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int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result);
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/*
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* Return the SHA-1 of the nth object within the specified packfile.
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* Open the index if it is not already open. The return value points
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* at the SHA-1 within the mmapped index. Return NULL if there is an
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* error.
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*/
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extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
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/*
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* Like nth_packed_object_sha1, but write the data into the object specified by
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* the the first argument. Returns the first argument on success, and NULL on
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* error.
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*/
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extern const struct object_id *nth_packed_object_oid(struct object_id *, struct packed_git *, uint32_t n);
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/*
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* Return the offset of the nth object within the specified packfile.
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* The index must already be opened.
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*/
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extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
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/*
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* If the object named sha1 is present in the specified packfile,
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* return its offset within the packfile; otherwise, return 0.
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*/
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extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
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extern int is_pack_valid(struct packed_git *);
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extern void *unpack_entry(struct repository *r, struct packed_git *, off_t, enum object_type *, unsigned long *);
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extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
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extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
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extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
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extern void release_pack_memory(size_t);
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/* global flag to enable extra checks when accessing packed objects */
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extern int do_check_packed_object_crc;
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extern int packed_object_info(struct repository *r,
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struct packed_git *pack,
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off_t offset, struct object_info *);
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extern void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1);
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extern const struct packed_git *has_packed_and_bad(const unsigned char *sha1);
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/*
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* Iff a pack file in the given repository contains the object named by sha1,
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* return true and store its location to e.
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*/
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extern int find_pack_entry(struct repository *r, const unsigned char *sha1, struct pack_entry *e);
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extern int has_sha1_pack(const unsigned char *sha1);
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extern int has_pack_index(const unsigned char *sha1);
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/*
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* Only iterate over packs obtained from the promisor remote.
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*/
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#define FOR_EACH_OBJECT_PROMISOR_ONLY 2
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/*
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* Iterate over packed objects in both the local
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* repository and any alternates repositories (unless the
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* FOR_EACH_OBJECT_LOCAL_ONLY flag, defined in cache.h, is set).
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*/
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typedef int each_packed_object_fn(const struct object_id *oid,
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struct packed_git *pack,
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uint32_t pos,
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void *data);
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extern int for_each_packed_object(each_packed_object_fn, void *, unsigned flags);
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/*
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* Return 1 if an object in a promisor packfile is or refers to the given
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* object, 0 otherwise.
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*/
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extern int is_promisor_object(const struct object_id *oid);
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#endif
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