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cache.h
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cache.h
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#ifndef CACHE_H
#define CACHE_H
#include "git-compat-util.h"
#include "strbuf.h"
#include "hashmap.h"
#include "list.h"
#include "advice.h"
#include "gettext.h"
#include "convert.h"
#include "trace.h"
#include "trace2.h"
#include "string-list.h"
#include "pack-revindex.h"
#include "hash.h"
#include "path.h"
#include "oid-array.h"
#include "repository.h"
#include "mem-pool.h"
#include <zlib.h>
typedef struct git_zstream {
z_stream z;
unsigned long avail_in;
unsigned long avail_out;
unsigned long total_in;
unsigned long total_out;
unsigned char *next_in;
unsigned char *next_out;
} git_zstream;
void git_inflate_init(git_zstream *);
void git_inflate_init_gzip_only(git_zstream *);
void git_inflate_end(git_zstream *);
int git_inflate(git_zstream *, int flush);
void git_deflate_init(git_zstream *, int level);
void git_deflate_init_gzip(git_zstream *, int level);
void git_deflate_init_raw(git_zstream *, int level);
void git_deflate_end(git_zstream *);
int git_deflate_abort(git_zstream *);
int git_deflate_end_gently(git_zstream *);
int git_deflate(git_zstream *, int flush);
unsigned long git_deflate_bound(git_zstream *, unsigned long);
#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
#define DTYPE(de) ((de)->d_type)
#else
#undef DT_UNKNOWN
#undef DT_DIR
#undef DT_REG
#undef DT_LNK
#define DT_UNKNOWN 0
#define DT_DIR 1
#define DT_REG 2
#define DT_LNK 3
#define DTYPE(de) DT_UNKNOWN
#endif
/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
#define S_IFINVALID 0030000
/*
* A "directory link" is a link to another git directory.
*
* The value 0160000 is not normally a valid mode, and
* also just happens to be S_IFDIR + S_IFLNK
*/
#define S_IFGITLINK 0160000
#define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK)
/*
* Some mode bits are also used internally for computations.
*
* They *must* not overlap with any valid modes, and they *must* not be emitted
* to outside world - i.e. appear on disk or network. In other words, it's just
* temporary fields, which we internally use, but they have to stay in-house.
*
* ( such approach is valid, as standard S_IF* fits into 16 bits, and in Git
* codebase mode is `unsigned int` which is assumed to be at least 32 bits )
*/
/* used internally in tree-diff */
#define S_DIFFTREE_IFXMIN_NEQ 0x80000000
/*
* Intensive research over the course of many years has shown that
* port 9418 is totally unused by anything else. Or
*
* Your search - "port 9418" - did not match any documents.
*
* as www.google.com puts it.
*
* This port has been properly assigned for git use by IANA:
* git (Assigned-9418) [I06-050728-0001].
*
* git 9418/tcp git pack transfer service
* git 9418/udp git pack transfer service
*
* with Linus Torvalds <torvalds@osdl.org> as the point of
* contact. September 2005.
*
* See http://www.iana.org/assignments/port-numbers
*/
#define DEFAULT_GIT_PORT 9418
/*
* Basic data structures for the directory cache
*/
#define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
struct cache_header {
uint32_t hdr_signature;
uint32_t hdr_version;
uint32_t hdr_entries;
};
#define INDEX_FORMAT_LB 2
#define INDEX_FORMAT_UB 4
/*
* The "cache_time" is just the low 32 bits of the
* time. It doesn't matter if it overflows - we only
* check it for equality in the 32 bits we save.
*/
struct cache_time {
uint32_t sec;
uint32_t nsec;
};
struct stat_data {
struct cache_time sd_ctime;
struct cache_time sd_mtime;
unsigned int sd_dev;
unsigned int sd_ino;
unsigned int sd_uid;
unsigned int sd_gid;
unsigned int sd_size;
};
struct cache_entry {
struct hashmap_entry ent;
struct stat_data ce_stat_data;
unsigned int ce_mode;
unsigned int ce_flags;
unsigned int mem_pool_allocated;
unsigned int ce_namelen;
unsigned int index; /* for link extension */
struct object_id oid;
char name[FLEX_ARRAY]; /* more */
};
#define CE_STAGEMASK (0x3000)
#define CE_EXTENDED (0x4000)
#define CE_VALID (0x8000)
#define CE_STAGESHIFT 12
/*
* Range 0xFFFF0FFF in ce_flags is divided into
* two parts: in-memory flags and on-disk ones.
* Flags in CE_EXTENDED_FLAGS will get saved on-disk
* if you want to save a new flag, add it in
* CE_EXTENDED_FLAGS
*
* In-memory only flags
*/
#define CE_UPDATE (1 << 16)
#define CE_REMOVE (1 << 17)
#define CE_UPTODATE (1 << 18)
#define CE_ADDED (1 << 19)
#define CE_HASHED (1 << 20)
#define CE_FSMONITOR_VALID (1 << 21)
#define CE_WT_REMOVE (1 << 22) /* remove in work directory */
#define CE_CONFLICTED (1 << 23)
#define CE_UNPACKED (1 << 24)
#define CE_NEW_SKIP_WORKTREE (1 << 25)
/* used to temporarily mark paths matched by pathspecs */
#define CE_MATCHED (1 << 26)
#define CE_UPDATE_IN_BASE (1 << 27)
#define CE_STRIP_NAME (1 << 28)
/*
* Extended on-disk flags
*/
#define CE_INTENT_TO_ADD (1 << 29)
#define CE_SKIP_WORKTREE (1 << 30)
/* CE_EXTENDED2 is for future extension */
#define CE_EXTENDED2 (1U << 31)
#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE)
/*
* Safeguard to avoid saving wrong flags:
* - CE_EXTENDED2 won't get saved until its semantic is known
* - Bits in 0x0000FFFF have been saved in ce_flags already
* - Bits in 0x003F0000 are currently in-memory flags
*/
#if CE_EXTENDED_FLAGS & 0x803FFFFF
#error "CE_EXTENDED_FLAGS out of range"
#endif
/* Forward structure decls */
struct pathspec;
struct child_process;
struct tree;
/*
* Copy the sha1 and stat state of a cache entry from one to
* another. But we never change the name, or the hash state!
*/
static inline void copy_cache_entry(struct cache_entry *dst,
const struct cache_entry *src)
{
unsigned int state = dst->ce_flags & CE_HASHED;
int mem_pool_allocated = dst->mem_pool_allocated;
/* Don't copy hash chain and name */
memcpy(&dst->ce_stat_data, &src->ce_stat_data,
offsetof(struct cache_entry, name) -
offsetof(struct cache_entry, ce_stat_data));
/* Restore the hash state */
dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state;
/* Restore the mem_pool_allocated flag */
dst->mem_pool_allocated = mem_pool_allocated;
}
static inline unsigned create_ce_flags(unsigned stage)
{
return (stage << CE_STAGESHIFT);
}
#define ce_namelen(ce) ((ce)->ce_namelen)
#define ce_size(ce) cache_entry_size(ce_namelen(ce))
#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
#define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE)
#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
#define ce_intent_to_add(ce) ((ce)->ce_flags & CE_INTENT_TO_ADD)
#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
static inline unsigned int create_ce_mode(unsigned int mode)
{
if (S_ISLNK(mode))
return S_IFLNK;
if (S_ISDIR(mode) || S_ISGITLINK(mode))
return S_IFGITLINK;
return S_IFREG | ce_permissions(mode);
}
static inline unsigned int ce_mode_from_stat(const struct cache_entry *ce,
unsigned int mode)
{
extern int trust_executable_bit, has_symlinks;
if (!has_symlinks && S_ISREG(mode) &&
ce && S_ISLNK(ce->ce_mode))
return ce->ce_mode;
if (!trust_executable_bit && S_ISREG(mode)) {
if (ce && S_ISREG(ce->ce_mode))
return ce->ce_mode;
return create_ce_mode(0666);
}
return create_ce_mode(mode);
}
static inline int ce_to_dtype(const struct cache_entry *ce)
{
unsigned ce_mode = ntohl(ce->ce_mode);
if (S_ISREG(ce_mode))
return DT_REG;
else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
return DT_DIR;
else if (S_ISLNK(ce_mode))
return DT_LNK;
else
return DT_UNKNOWN;
}
static inline unsigned int canon_mode(unsigned int mode)
{
if (S_ISREG(mode))
return S_IFREG | ce_permissions(mode);
if (S_ISLNK(mode))
return S_IFLNK;
if (S_ISDIR(mode))
return S_IFDIR;
return S_IFGITLINK;
}
#define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1)
#define SOMETHING_CHANGED (1 << 0) /* unclassified changes go here */
#define CE_ENTRY_CHANGED (1 << 1)
#define CE_ENTRY_REMOVED (1 << 2)
#define CE_ENTRY_ADDED (1 << 3)
#define RESOLVE_UNDO_CHANGED (1 << 4)
#define CACHE_TREE_CHANGED (1 << 5)
#define SPLIT_INDEX_ORDERED (1 << 6)
#define UNTRACKED_CHANGED (1 << 7)
#define FSMONITOR_CHANGED (1 << 8)
struct split_index;
struct untracked_cache;
struct progress;
struct index_state {
struct cache_entry **cache;
unsigned int version;
unsigned int cache_nr, cache_alloc, cache_changed;
struct string_list *resolve_undo;
struct cache_tree *cache_tree;
struct split_index *split_index;
struct cache_time timestamp;
unsigned name_hash_initialized : 1,
initialized : 1,
drop_cache_tree : 1,
updated_workdir : 1,
updated_skipworktree : 1,
fsmonitor_has_run_once : 1;
struct hashmap name_hash;
struct hashmap dir_hash;
struct object_id oid;
struct untracked_cache *untracked;
char *fsmonitor_last_update;
struct ewah_bitmap *fsmonitor_dirty;
struct mem_pool *ce_mem_pool;
struct progress *progress;
};
/* Name hashing */
int test_lazy_init_name_hash(struct index_state *istate, int try_threaded);
void add_name_hash(struct index_state *istate, struct cache_entry *ce);
void remove_name_hash(struct index_state *istate, struct cache_entry *ce);
void free_name_hash(struct index_state *istate);
/* Cache entry creation and cleanup */
/*
* Create cache_entry intended for use in the specified index. Caller
* is responsible for discarding the cache_entry with
* `discard_cache_entry`.
*/
struct cache_entry *make_cache_entry(struct index_state *istate,
unsigned int mode,
const struct object_id *oid,
const char *path,
int stage,
unsigned int refresh_options);
struct cache_entry *make_empty_cache_entry(struct index_state *istate,
size_t name_len);
/*
* Create a cache_entry that is not intended to be added to an index.
* Caller is responsible for discarding the cache_entry
* with `discard_cache_entry`.
*/
struct cache_entry *make_transient_cache_entry(unsigned int mode,
const struct object_id *oid,
const char *path,
int stage);
struct cache_entry *make_empty_transient_cache_entry(size_t name_len);
/*
* Discard cache entry.
*/
void discard_cache_entry(struct cache_entry *ce);
/*
* Check configuration if we should perform extra validation on cache
* entries.
*/
int should_validate_cache_entries(void);
/*
* Duplicate a cache_entry. Allocate memory for the new entry from a
* memory_pool. Takes into account cache_entry fields that are meant
* for managing the underlying memory allocation of the cache_entry.
*/
struct cache_entry *dup_cache_entry(const struct cache_entry *ce, struct index_state *istate);
/*
* Validate the cache entries in the index. This is an internal
* consistency check that the cache_entry structs are allocated from
* the expected memory pool.
*/
void validate_cache_entries(const struct index_state *istate);
#ifdef USE_THE_INDEX_COMPATIBILITY_MACROS
extern struct index_state the_index;
#define active_cache (the_index.cache)
#define active_nr (the_index.cache_nr)
#define active_alloc (the_index.cache_alloc)
#define active_cache_changed (the_index.cache_changed)
#define active_cache_tree (the_index.cache_tree)
#define read_cache() repo_read_index(the_repository)
#define read_cache_from(path) read_index_from(&the_index, (path), (get_git_dir()))
#define read_cache_preload(pathspec) repo_read_index_preload(the_repository, (pathspec), 0)
#define is_cache_unborn() is_index_unborn(&the_index)
#define read_cache_unmerged() repo_read_index_unmerged(the_repository)
#define discard_cache() discard_index(&the_index)
#define unmerged_cache() unmerged_index(&the_index)
#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
#define chmod_cache_entry(ce, flip) chmod_index_entry(&the_index, (ce), (flip))
#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL)
#define refresh_and_write_cache(refresh_flags, write_flags, gentle) repo_refresh_and_write_index(the_repository, (refresh_flags), (write_flags), (gentle), NULL, NULL, NULL)
#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
#define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen))
#define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase))
#define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
#define resolve_undo_clear() resolve_undo_clear_index(&the_index)
#define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
#define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
#define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz))
#define hold_locked_index(lock_file, flags) repo_hold_locked_index(the_repository, (lock_file), (flags))
#endif
#define TYPE_BITS 3
/*
* Values in this enum (except those outside the 3 bit range) are part
* of pack file format. See Documentation/technical/pack-format.txt
* for more information.
*/
enum object_type {
OBJ_BAD = -1,
OBJ_NONE = 0,
OBJ_COMMIT = 1,
OBJ_TREE = 2,
OBJ_BLOB = 3,
OBJ_TAG = 4,
/* 5 for future expansion */
OBJ_OFS_DELTA = 6,
OBJ_REF_DELTA = 7,
OBJ_ANY,
OBJ_MAX
};
static inline enum object_type object_type(unsigned int mode)
{
return S_ISDIR(mode) ? OBJ_TREE :
S_ISGITLINK(mode) ? OBJ_COMMIT :
OBJ_BLOB;
}
/* Double-check local_repo_env below if you add to this list. */
#define GIT_DIR_ENVIRONMENT "GIT_DIR"
#define GIT_COMMON_DIR_ENVIRONMENT "GIT_COMMON_DIR"
#define GIT_NAMESPACE_ENVIRONMENT "GIT_NAMESPACE"
#define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
#define GIT_PREFIX_ENVIRONMENT "GIT_PREFIX"
#define GIT_SUPER_PREFIX_ENVIRONMENT "GIT_INTERNAL_SUPER_PREFIX"
#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
#define GIT_SHALLOW_FILE_ENVIRONMENT "GIT_SHALLOW_FILE"
#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
#define CONFIG_ENVIRONMENT "GIT_CONFIG"
#define CONFIG_DATA_ENVIRONMENT "GIT_CONFIG_PARAMETERS"
#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
#define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
#define NO_REPLACE_OBJECTS_ENVIRONMENT "GIT_NO_REPLACE_OBJECTS"
#define GIT_REPLACE_REF_BASE_ENVIRONMENT "GIT_REPLACE_REF_BASE"
#define GITATTRIBUTES_FILE ".gitattributes"
#define INFOATTRIBUTES_FILE "info/attributes"
#define ATTRIBUTE_MACRO_PREFIX "[attr]"
#define GITMODULES_FILE ".gitmodules"
#define GITMODULES_INDEX ":.gitmodules"
#define GITMODULES_HEAD "HEAD:.gitmodules"
#define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
#define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
#define GIT_NOTES_DISPLAY_REF_ENVIRONMENT "GIT_NOTES_DISPLAY_REF"
#define GIT_NOTES_REWRITE_REF_ENVIRONMENT "GIT_NOTES_REWRITE_REF"
#define GIT_NOTES_REWRITE_MODE_ENVIRONMENT "GIT_NOTES_REWRITE_MODE"
#define GIT_LITERAL_PATHSPECS_ENVIRONMENT "GIT_LITERAL_PATHSPECS"
#define GIT_GLOB_PATHSPECS_ENVIRONMENT "GIT_GLOB_PATHSPECS"
#define GIT_NOGLOB_PATHSPECS_ENVIRONMENT "GIT_NOGLOB_PATHSPECS"
#define GIT_ICASE_PATHSPECS_ENVIRONMENT "GIT_ICASE_PATHSPECS"
#define GIT_QUARANTINE_ENVIRONMENT "GIT_QUARANTINE_PATH"
#define GIT_OPTIONAL_LOCKS_ENVIRONMENT "GIT_OPTIONAL_LOCKS"
#define GIT_TEXT_DOMAIN_DIR_ENVIRONMENT "GIT_TEXTDOMAINDIR"
/*
* Environment variable used in handshaking the wire protocol.
* Contains a colon ':' separated list of keys with optional values
* 'key[=value]'. Presence of unknown keys and values must be
* ignored.
*/
#define GIT_PROTOCOL_ENVIRONMENT "GIT_PROTOCOL"
/* HTTP header used to handshake the wire protocol */
#define GIT_PROTOCOL_HEADER "Git-Protocol"
/*
* This environment variable is expected to contain a boolean indicating
* whether we should or should not treat:
*
* GIT_DIR=foo.git git ...
*
* as if GIT_WORK_TREE=. was given. It's not expected that users will make use
* of this, but we use it internally to communicate to sub-processes that we
* are in a bare repo. If not set, defaults to true.
*/
#define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT "GIT_IMPLICIT_WORK_TREE"
/*
* Repository-local GIT_* environment variables; these will be cleared
* when git spawns a sub-process that runs inside another repository.
* The array is NULL-terminated, which makes it easy to pass in the "env"
* parameter of a run-command invocation, or to do a simple walk.
*/
extern const char * const local_repo_env[];
void setup_git_env(const char *git_dir);
/*
* Returns true iff we have a configured git repository (either via
* setup_git_directory, or in the environment via $GIT_DIR).
*/
int have_git_dir(void);
extern int is_bare_repository_cfg;
int is_bare_repository(void);
int is_inside_git_dir(void);
extern char *git_work_tree_cfg;
int is_inside_work_tree(void);
const char *get_git_dir(void);
const char *get_git_common_dir(void);
char *get_object_directory(void);
char *get_index_file(void);
char *get_graft_file(struct repository *r);
void set_git_dir(const char *path, int make_realpath);
int get_common_dir_noenv(struct strbuf *sb, const char *gitdir);
int get_common_dir(struct strbuf *sb, const char *gitdir);
const char *get_git_namespace(void);
const char *strip_namespace(const char *namespaced_ref);
const char *get_super_prefix(void);
const char *get_git_work_tree(void);
/*
* Return true if the given path is a git directory; note that this _just_
* looks at the directory itself. If you want to know whether "foo/.git"
* is a repository, you must feed that path, not just "foo".
*/
int is_git_directory(const char *path);
/*
* Return 1 if the given path is the root of a git repository or
* submodule, else 0. Will not return 1 for bare repositories with the
* exception of creating a bare repository in "foo/.git" and calling
* is_git_repository("foo").
*
* If we run into read errors, we err on the side of saying "yes, it is",
* as we usually consider sub-repos precious, and would prefer to err on the
* side of not disrupting or deleting them.
*/
int is_nonbare_repository_dir(struct strbuf *path);
#define READ_GITFILE_ERR_STAT_FAILED 1
#define READ_GITFILE_ERR_NOT_A_FILE 2
#define READ_GITFILE_ERR_OPEN_FAILED 3
#define READ_GITFILE_ERR_READ_FAILED 4
#define READ_GITFILE_ERR_INVALID_FORMAT 5
#define READ_GITFILE_ERR_NO_PATH 6
#define READ_GITFILE_ERR_NOT_A_REPO 7
#define READ_GITFILE_ERR_TOO_LARGE 8
void read_gitfile_error_die(int error_code, const char *path, const char *dir);
const char *read_gitfile_gently(const char *path, int *return_error_code);
#define read_gitfile(path) read_gitfile_gently((path), NULL)
const char *resolve_gitdir_gently(const char *suspect, int *return_error_code);
#define resolve_gitdir(path) resolve_gitdir_gently((path), NULL)
void set_git_work_tree(const char *tree);
#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
void setup_work_tree(void);
/*
* Find the commondir and gitdir of the repository that contains the current
* working directory, without changing the working directory or other global
* state. The result is appended to commondir and gitdir. If the discovered
* gitdir does not correspond to a worktree, then 'commondir' and 'gitdir' will
* both have the same result appended to the buffer. The return value is
* either 0 upon success and non-zero if no repository was found.
*/
int discover_git_directory(struct strbuf *commondir,
struct strbuf *gitdir);
const char *setup_git_directory_gently(int *);
const char *setup_git_directory(void);
char *prefix_path(const char *prefix, int len, const char *path);
char *prefix_path_gently(const char *prefix, int len, int *remaining, const char *path);
/*
* Concatenate "prefix" (if len is non-zero) and "path", with no
* connecting characters (so "prefix" should end with a "/").
* Unlike prefix_path, this should be used if the named file does
* not have to interact with index entry; i.e. name of a random file
* on the filesystem.
*
* The return value is always a newly allocated string (even if the
* prefix was empty).
*/
char *prefix_filename(const char *prefix, const char *path);
int check_filename(const char *prefix, const char *name);
void verify_filename(const char *prefix,
const char *name,
int diagnose_misspelt_rev);
void verify_non_filename(const char *prefix, const char *name);
int path_inside_repo(const char *prefix, const char *path);
#define INIT_DB_QUIET 0x0001
#define INIT_DB_EXIST_OK 0x0002
int init_db(const char *git_dir, const char *real_git_dir,
const char *template_dir, int hash_algo,
unsigned int flags);
void initialize_repository_version(int hash_algo);
void sanitize_stdfds(void);
int daemonize(void);
#define alloc_nr(x) (((x)+16)*3/2)
/**
* Dynamically growing an array using realloc() is error prone and boring.
*
* Define your array with:
*
* - a pointer (`item`) that points at the array, initialized to `NULL`
* (although please name the variable based on its contents, not on its
* type);
*
* - an integer variable (`alloc`) that keeps track of how big the current
* allocation is, initialized to `0`;
*
* - another integer variable (`nr`) to keep track of how many elements the
* array currently has, initialized to `0`.
*
* Then before adding `n`th element to the item, call `ALLOC_GROW(item, n,
* alloc)`. This ensures that the array can hold at least `n` elements by
* calling `realloc(3)` and adjusting `alloc` variable.
*
* ------------
* sometype *item;
* size_t nr;
* size_t alloc
*
* for (i = 0; i < nr; i++)
* if (we like item[i] already)
* return;
*
* // we did not like any existing one, so add one
* ALLOC_GROW(item, nr + 1, alloc);
* item[nr++] = value you like;
* ------------
*
* You are responsible for updating the `nr` variable.
*
* If you need to specify the number of elements to allocate explicitly
* then use the macro `REALLOC_ARRAY(item, alloc)` instead of `ALLOC_GROW`.
*
* Consider using ALLOC_GROW_BY instead of ALLOC_GROW as it has some
* added niceties.
*
* DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'.
*/
#define ALLOC_GROW(x, nr, alloc) \
do { \
if ((nr) > alloc) { \
if (alloc_nr(alloc) < (nr)) \
alloc = (nr); \
else \
alloc = alloc_nr(alloc); \
REALLOC_ARRAY(x, alloc); \
} \
} while (0)
/*
* Similar to ALLOC_GROW but handles updating of the nr value and
* zeroing the bytes of the newly-grown array elements.
*
* DO NOT USE any expression with side-effect for any of the
* arguments.
*/
#define ALLOC_GROW_BY(x, nr, increase, alloc) \
do { \
if (increase) { \
size_t new_nr = nr + (increase); \
if (new_nr < nr) \
BUG("negative growth in ALLOC_GROW_BY"); \
ALLOC_GROW(x, new_nr, alloc); \
memset((x) + nr, 0, sizeof(*(x)) * (increase)); \
nr = new_nr; \
} \
} while (0)
/* Initialize and use the cache information */
struct lock_file;
void preload_index(struct index_state *index,
const struct pathspec *pathspec,
unsigned int refresh_flags);
int do_read_index(struct index_state *istate, const char *path,
int must_exist); /* for testting only! */
int read_index_from(struct index_state *, const char *path,
const char *gitdir);
int is_index_unborn(struct index_state *);
/* For use with `write_locked_index()`. */
#define COMMIT_LOCK (1 << 0)
#define SKIP_IF_UNCHANGED (1 << 1)
/*
* Write the index while holding an already-taken lock. Close the lock,
* and if `COMMIT_LOCK` is given, commit it.
*
* Unless a split index is in use, write the index into the lockfile.
*
* With a split index, write the shared index to a temporary file,
* adjust its permissions and rename it into place, then write the
* split index to the lockfile. If the temporary file for the shared
* index cannot be created, fall back to the behavior described in
* the previous paragraph.
*
* With `COMMIT_LOCK`, the lock is always committed or rolled back.
* Without it, the lock is closed, but neither committed nor rolled
* back.
*
* If `SKIP_IF_UNCHANGED` is given and the index is unchanged, nothing
* is written (and the lock is rolled back if `COMMIT_LOCK` is given).
*/
int write_locked_index(struct index_state *, struct lock_file *lock, unsigned flags);
int discard_index(struct index_state *);
void move_index_extensions(struct index_state *dst, struct index_state *src);
int unmerged_index(const struct index_state *);
/**
* Returns 1 if istate differs from tree, 0 otherwise. If tree is NULL,
* compares istate to HEAD. If tree is NULL and on an unborn branch,
* returns 1 if there are entries in istate, 0 otherwise. If an strbuf is
* provided, the space-separated list of files that differ will be appended
* to it.
*/
int repo_index_has_changes(struct repository *repo,
struct tree *tree,
struct strbuf *sb);
int verify_path(const char *path, unsigned mode);
int strcmp_offset(const char *s1, const char *s2, size_t *first_change);
int index_dir_exists(struct index_state *istate, const char *name, int namelen);
void adjust_dirname_case(struct index_state *istate, char *name);
struct cache_entry *index_file_exists(struct index_state *istate, const char *name, int namelen, int igncase);
/*
* Searches for an entry defined by name and namelen in the given index.
* If the return value is positive (including 0) it is the position of an
* exact match. If the return value is negative, the negated value minus 1
* is the position where the entry would be inserted.
* Example: The current index consists of these files and its stages:
*
* b#0, d#0, f#1, f#3
*
* index_name_pos(&index, "a", 1) -> -1
* index_name_pos(&index, "b", 1) -> 0
* index_name_pos(&index, "c", 1) -> -2
* index_name_pos(&index, "d", 1) -> 1
* index_name_pos(&index, "e", 1) -> -3
* index_name_pos(&index, "f", 1) -> -3
* index_name_pos(&index, "g", 1) -> -5
*/
int index_name_pos(const struct index_state *, const char *name, int namelen);
/*
* Some functions return the negative complement of an insert position when a
* precise match was not found but a position was found where the entry would
* need to be inserted. This helper protects that logic from any integer
* underflow.
*/
static inline int index_pos_to_insert_pos(uintmax_t pos)
{
if (pos > INT_MAX)
die("overflow: -1 - %"PRIuMAX, pos);
return -1 - (int)pos;
}
#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
#define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
#define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
#define ADD_CACHE_JUST_APPEND 8 /* Append only; tree.c::read_tree() */
#define ADD_CACHE_NEW_ONLY 16 /* Do not replace existing ones */
#define ADD_CACHE_KEEP_CACHE_TREE 32 /* Do not invalidate cache-tree */
#define ADD_CACHE_RENORMALIZE 64 /* Pass along HASH_RENORMALIZE */
int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
/* Remove entry, return true if there are more entries to go. */
int remove_index_entry_at(struct index_state *, int pos);
void remove_marked_cache_entries(struct index_state *istate, int invalidate);
int remove_file_from_index(struct index_state *, const char *path);
#define ADD_CACHE_VERBOSE 1
#define ADD_CACHE_PRETEND 2
#define ADD_CACHE_IGNORE_ERRORS 4
#define ADD_CACHE_IGNORE_REMOVAL 8
#define ADD_CACHE_INTENT 16
/*
* These two are used to add the contents of the file at path
* to the index, marking the working tree up-to-date by storing
* the cached stat info in the resulting cache entry. A caller
* that has already run lstat(2) on the path can call
* add_to_index(), and all others can call add_file_to_index();
* the latter will do necessary lstat(2) internally before
* calling the former.
*/
int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
int add_file_to_index(struct index_state *, const char *path, int flags);
int chmod_index_entry(struct index_state *, struct cache_entry *ce, char flip);
int ce_same_name(const struct cache_entry *a, const struct cache_entry *b);
void set_object_name_for_intent_to_add_entry(struct cache_entry *ce);
int index_name_is_other(const struct index_state *, const char *, int);
void *read_blob_data_from_index(const struct index_state *, const char *, unsigned long *);
/* do stat comparison even if CE_VALID is true */
#define CE_MATCH_IGNORE_VALID 01
/* do not check the contents but report dirty on racily-clean entries */
#define CE_MATCH_RACY_IS_DIRTY 02
/* do stat comparison even if CE_SKIP_WORKTREE is true */
#define CE_MATCH_IGNORE_SKIP_WORKTREE 04
/* ignore non-existent files during stat update */
#define CE_MATCH_IGNORE_MISSING 0x08
/* enable stat refresh */
#define CE_MATCH_REFRESH 0x10
/* don't refresh_fsmonitor state or do stat comparison even if CE_FSMONITOR_VALID is true */
#define CE_MATCH_IGNORE_FSMONITOR 0X20
int is_racy_timestamp(const struct index_state *istate,
const struct cache_entry *ce);
int ie_match_stat(struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
int ie_modified(struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
#define HASH_WRITE_OBJECT 1
#define HASH_FORMAT_CHECK 2
#define HASH_RENORMALIZE 4
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);
int index_path(struct index_state *istate, struct object_id *oid, const char *path, struct stat *st, unsigned flags);
/*
* Record to sd the data from st that we use to check whether a file
* might have changed.
*/
void fill_stat_data(struct stat_data *sd, struct stat *st);
/*
* Return 0 if st is consistent with a file not having been changed
* since sd was filled. If there are differences, return a
* combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED,
* INODE_CHANGED, and DATA_CHANGED.
*/
int match_stat_data(const struct stat_data *sd, struct stat *st);
int match_stat_data_racy(const struct index_state *istate,
const struct stat_data *sd, struct stat *st);
void fill_stat_cache_info(struct index_state *istate, struct cache_entry *ce, struct stat *st);
#define REFRESH_REALLY 0x0001 /* ignore_valid */
#define REFRESH_UNMERGED 0x0002 /* allow unmerged */
#define REFRESH_QUIET 0x0004 /* be quiet about it */
#define REFRESH_IGNORE_MISSING 0x0008 /* ignore non-existent */
#define REFRESH_IGNORE_SUBMODULES 0x0010 /* ignore submodules */
#define REFRESH_IN_PORCELAIN 0x0020 /* user friendly output, not "needs update" */
#define REFRESH_PROGRESS 0x0040 /* show progress bar if stderr is tty */
int refresh_index(struct index_state *, unsigned int flags, const struct pathspec *pathspec, char *seen, const char *header_msg);
/*
* Refresh the index and write it to disk.
*
* 'refresh_flags' is passed directly to 'refresh_index()', while
* 'COMMIT_LOCK | write_flags' is passed to 'write_locked_index()', so
* the lockfile is always either committed or rolled back.
*
* If 'gentle' is passed, errors locking the index are ignored.
*
* Return 1 if refreshing the index returns an error, -1 if writing
* the index to disk fails, 0 on success.
*
* Note that if refreshing the index returns an error, we still write
* out the index (unless locking fails).
*/
int repo_refresh_and_write_index(struct repository*, unsigned int refresh_flags, unsigned int write_flags, int gentle, const struct pathspec *, char *seen, const char *header_msg);
struct cache_entry *refresh_cache_entry(struct index_state *, struct cache_entry *, unsigned int);
void set_alternate_index_output(const char *);
extern int verify_index_checksum;
extern int verify_ce_order;
/* Environment bits from configuration mechanism */
extern int trust_executable_bit;
extern int trust_ctime;
extern int check_stat;
extern int quote_path_fully;
extern int has_symlinks;
extern int minimum_abbrev, default_abbrev;
extern int ignore_case;
extern int assume_unchanged;
extern int prefer_symlink_refs;
extern int warn_ambiguous_refs;
extern int warn_on_object_refname_ambiguity;
extern const char *apply_default_whitespace;
extern const char *apply_default_ignorewhitespace;
extern const char *git_attributes_file;
extern const char *git_hooks_path;
extern int zlib_compression_level;
extern int core_compression_level;
extern int pack_compression_level;
extern size_t packed_git_window_size;
extern size_t packed_git_limit;
extern size_t delta_base_cache_limit;
extern unsigned long big_file_threshold;
extern unsigned long pack_size_limit_cfg;
/*
* Accessors for the core.sharedrepository config which lazy-load the value
* from the config (if not already set). The "reset" function can be
* used to unset "set" or cached value, meaning that the value will be loaded
* fresh from the config file on the next call to get_shared_repository().
*/
void set_shared_repository(int value);
int get_shared_repository(void);
void reset_shared_repository(void);
/*
* Do replace refs need to be checked this run? This variable is
* initialized to true unless --no-replace-object is used or
* $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some
* commands that do not want replace references to be active.
*/
extern int read_replace_refs;
extern char *git_replace_ref_base;
extern int fsync_object_files;
extern int core_preload_index;
extern int precomposed_unicode;
extern int protect_hfs;
extern int protect_ntfs;
extern const char *core_fsmonitor;
extern int core_apply_sparse_checkout;
extern int core_sparse_checkout_cone;
/*
* Include broken refs in all ref iterations, which will
* generally choke dangerous operations rather than letting
* them silently proceed without taking the broken ref into
* account.
*/
extern int ref_paranoia;
/*
* Returns the boolean value of $GIT_OPTIONAL_LOCKS (or the default value).
*/
int use_optional_locks(void);
/*
* The character that begins a commented line in user-editable file
* that is subject to stripspace.
*/
extern char comment_line_char;
extern int auto_comment_line_char;
enum log_refs_config {
LOG_REFS_UNSET = -1,
LOG_REFS_NONE = 0,
LOG_REFS_NORMAL,
LOG_REFS_ALWAYS
};
extern enum log_refs_config log_all_ref_updates;
enum rebase_setup_type {
AUTOREBASE_NEVER = 0,
AUTOREBASE_LOCAL,
AUTOREBASE_REMOTE,
AUTOREBASE_ALWAYS
};