extern char *git_path_submodule(const char *path, const char *fmt, ...)
__attribute__((format (printf, 2, 3)));
-extern char *sha1_file_name(const unsigned char *sha1);
+/*
+ * Return the name of the file in the local object database that would
+ * be used to store a loose object with the specified sha1. The
+ * return value is a pointer to a statically allocated buffer that is
+ * overwritten each time the function is called.
+ */
+extern const char *sha1_file_name(const unsigned char *sha1);
+
+/*
+ * Return the name of the (local) packfile with the specified sha1 in
+ * its name. The return value is a pointer to memory that is
+ * overwritten each time this function is called.
+ */
extern char *sha1_pack_name(const unsigned char *sha1);
+
+/*
+ * Return the name of the (local) pack index file with the specified
+ * sha1 in its name. The return value is a pointer to memory that is
+ * overwritten each time this function is called.
+ */
extern char *sha1_pack_index_name(const unsigned char *sha1);
+
extern const char *find_unique_abbrev(const unsigned char *sha1, int);
extern const unsigned char null_sha1[20];
extern int move_temp_to_file(const char *tmpfile, const char *filename);
extern int has_sha1_pack(const unsigned char *sha1);
+
+/*
+ * Return true iff we have an object named sha1, whether local or in
+ * an alternate object database, and whether packed or loose. This
+ * function does not respect replace references.
+ */
extern int has_sha1_file(const unsigned char *sha1);
+
+/*
+ * Return true iff an alternate object database has a loose object
+ * with the specified name. This function does not respect replace
+ * references.
+ */
extern int has_loose_object_nonlocal(const unsigned char *sha1);
extern int has_pack_index(const unsigned char *sha1);
struct packed_git *packs);
extern void pack_report(void);
+
+/*
+ * mmap the index file for the specified packfile (if it is not
+ * already mmapped). Return 0 on success.
+ */
extern int open_pack_index(struct packed_git *);
+
+/*
+ * munmap the index file for the specified packfile (if it is
+ * currently mmapped).
+ */
extern void close_pack_index(struct packed_git *);
+
extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
extern void close_pack_windows(struct packed_git *);
extern void unuse_pack(struct pack_window **);
extern void free_pack_by_name(const char *);
extern void clear_delta_base_cache(void);
extern struct packed_git *add_packed_git(const char *, int, int);
-extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
-extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t);
-extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
+
+/*
+ * Return the SHA-1 of the nth object within the specified packfile.
+ * Open the index if it is not already open. The return value points
+ * at the SHA-1 within the mmapped index. Return NULL if there is an
+ * error.
+ */
+extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
+
+/*
+ * Return the offset of the nth object within the specified packfile.
+ * The index must already be opened.
+ */
+extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
+
+/*
+ * If the object named sha1 is present in the specified packfile,
+ * return its offset within the packfile; otherwise, return 0.
+ */
+extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
+
extern int is_pack_valid(struct packed_git *);
extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
unsigned char *sha1)
{
char *hex = sha1_to_hex(sha1);
- char *filename;
+ const char *filename;
char prevfile[PATH_MAX];
int prevlocal;
char prev_buf[PREV_BUF_SIZE];
#include "refs.h"
#include "commit.h"
+/*
+ * An array of replacements. The array is kept sorted by the original
+ * sha1.
+ */
static struct replace_object {
- unsigned char sha1[2][20];
+ unsigned char original[20];
+ unsigned char replacement[20];
} **replace_object;
static int replace_object_alloc, replace_object_nr;
static const unsigned char *replace_sha1_access(size_t index, void *table)
{
struct replace_object **replace = table;
- return replace[index]->sha1[0];
+ return replace[index]->original;
}
static int replace_object_pos(const unsigned char *sha1)
static int register_replace_object(struct replace_object *replace,
int ignore_dups)
{
- int pos = replace_object_pos(replace->sha1[0]);
+ int pos = replace_object_pos(replace->original);
if (0 <= pos) {
if (ignore_dups)
const char *hash = slash ? slash + 1 : refname;
struct replace_object *repl_obj = xmalloc(sizeof(*repl_obj));
- if (strlen(hash) != 40 || get_sha1_hex(hash, repl_obj->sha1[0])) {
+ if (strlen(hash) != 40 || get_sha1_hex(hash, repl_obj->original)) {
free(repl_obj);
warning("bad replace ref name: %s", refname);
return 0;
}
/* Copy sha1 from the read ref */
- hashcpy(repl_obj->sha1[1], sha1);
+ hashcpy(repl_obj->replacement, sha1);
/* Register new object */
if (register_replace_object(repl_obj, 1))
pos = replace_object_pos(cur);
if (0 <= pos)
- cur = replace_object[pos]->sha1[1];
+ cur = replace_object[pos]->replacement;
} while (0 <= pos);
return cur;
0
};
+/*
+ * A pointer to the last packed_git in which an object was found.
+ * When an object is sought, we look in this packfile first, because
+ * objects that are looked up at similar times are often in the same
+ * packfile as one another.
+ */
static struct packed_git *last_found_pack;
static struct cached_object *find_cached_object(const unsigned char *sha1)
}
}
-/*
- * NOTE! This returns a statically allocated buffer, so you have to be
- * careful about using it. Do an "xstrdup()" if you need to save the
- * filename.
- *
- * Also note that this returns the location for creating. Reading
- * SHA1 file can happen from any alternate directory listed in the
- * DB_ENVIRONMENT environment variable if it is not found in
- * the primary object database.
- */
-char *sha1_file_name(const unsigned char *sha1)
+const char *sha1_file_name(const unsigned char *sha1)
{
static char buf[PATH_MAX];
const char *objdir;
return buf;
}
+/*
+ * Return the name of the pack or index file with the specified sha1
+ * in its filename. *base and *name are scratch space that must be
+ * provided by the caller. which should be "pack" or "idx".
+ */
static char *sha1_get_pack_name(const unsigned char *sha1,
char **name, char **base, const char *which)
{
static int has_loose_object_local(const unsigned char *sha1)
{
- char *name = sha1_file_name(sha1);
- return !access(name, F_OK);
+ return !access(sha1_file_name(sha1), F_OK);
}
int has_loose_object_nonlocal(const unsigned char *sha1)
sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped));
}
-static int check_packed_git_idx(const char *path, struct packed_git *p)
+/*
+ * Open and mmap the index file at path, perform a couple of
+ * consistency checks, then record its information to p. Return 0 on
+ * success.
+ */
+static int check_packed_git_idx(const char *path, struct packed_git *p)
{
void *idx_map;
struct pack_idx_header *hdr;
static int stat_sha1_file(const unsigned char *sha1, struct stat *st)
{
- char *name = sha1_file_name(sha1);
struct alternate_object_database *alt;
- if (!lstat(name, st))
+ if (!lstat(sha1_file_name(sha1), st))
return 0;
prepare_alt_odb();
errno = ENOENT;
for (alt = alt_odb_list; alt; alt = alt->next) {
- name = alt->name;
- fill_sha1_path(name, sha1);
+ fill_sha1_path(alt->name, sha1);
if (!lstat(alt->base, st))
return 0;
}
static int open_sha1_file(const unsigned char *sha1)
{
int fd;
- char *name = sha1_file_name(sha1);
struct alternate_object_database *alt;
- fd = git_open_noatime(name);
+ fd = git_open_noatime(sha1_file_name(sha1));
if (fd >= 0)
return fd;
prepare_alt_odb();
errno = ENOENT;
for (alt = alt_odb_list; alt; alt = alt->next) {
- name = alt->name;
- fill_sha1_path(name, sha1);
+ fill_sha1_path(alt->name, sha1);
fd = git_open_noatime(alt->base);
if (fd >= 0)
return fd;
return 1;
}
+/*
+ * Iff a pack file contains the object named by sha1, return true and
+ * store its location to e.
+ */
static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
{
struct packed_git *p;
return 1;
for (p = packed_git; p; p = p->next) {
- if (p == last_found_pack || !fill_pack_entry(sha1, e, p))
- continue;
+ if (p == last_found_pack)
+ continue; /* we already checked this one */
- last_found_pack = p;
- return 1;
+ if (fill_pack_entry(sha1, e, p)) {
+ last_found_pack = p;
+ return 1;
+ }
}
return 0;
}
unsigned flag)
{
void *data;
- char *path;
const struct packed_git *p;
const unsigned char *repl = lookup_replace_object_extended(sha1, flag);
sha1_to_hex(repl), sha1_to_hex(sha1));
if (has_loose_object(repl)) {
- path = sha1_file_name(sha1);
+ const char *path = sha1_file_name(sha1);
+
die("loose object %s (stored in %s) is corrupt",
sha1_to_hex(repl), path);
}
git_zstream stream;
git_SHA_CTX c;
unsigned char parano_sha1[20];
- char *filename;
static char tmp_file[PATH_MAX];
+ const char *filename = sha1_file_name(sha1);
- filename = sha1_file_name(sha1);
fd = create_tmpfile(tmp_file, sizeof(tmp_file), filename);
if (fd < 0) {
if (errno == EACCES)