You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1708 lines
38 KiB
1708 lines
38 KiB
/* |
|
* GIT - The information manager from hell |
|
* |
|
* Copyright (C) Linus Torvalds, 2005 |
|
* |
|
* This handles basic git sha1 object files - packing, unpacking, |
|
* creation etc. |
|
*/ |
|
#include "cache.h" |
|
#include "delta.h" |
|
#include "pack.h" |
|
#include "blob.h" |
|
#include "commit.h" |
|
#include "tag.h" |
|
#include "tree.h" |
|
|
|
#ifndef O_NOATIME |
|
#if defined(__linux__) && (defined(__i386__) || defined(__PPC__)) |
|
#define O_NOATIME 01000000 |
|
#else |
|
#define O_NOATIME 0 |
|
#endif |
|
#endif |
|
|
|
const unsigned char null_sha1[20] = { 0, }; |
|
|
|
static unsigned int sha1_file_open_flag = O_NOATIME; |
|
|
|
static unsigned hexval(char c) |
|
{ |
|
if (c >= '0' && c <= '9') |
|
return c - '0'; |
|
if (c >= 'a' && c <= 'f') |
|
return c - 'a' + 10; |
|
if (c >= 'A' && c <= 'F') |
|
return c - 'A' + 10; |
|
return ~0; |
|
} |
|
|
|
int get_sha1_hex(const char *hex, unsigned char *sha1) |
|
{ |
|
int i; |
|
for (i = 0; i < 20; i++) { |
|
unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]); |
|
if (val & ~0xff) |
|
return -1; |
|
*sha1++ = val; |
|
hex += 2; |
|
} |
|
return 0; |
|
} |
|
|
|
int adjust_shared_perm(const char *path) |
|
{ |
|
struct stat st; |
|
int mode; |
|
|
|
if (!shared_repository) |
|
return 0; |
|
if (lstat(path, &st) < 0) |
|
return -1; |
|
mode = st.st_mode; |
|
if (mode & S_IRUSR) |
|
mode |= S_IRGRP; |
|
if (mode & S_IWUSR) |
|
mode |= S_IWGRP; |
|
if (mode & S_IXUSR) |
|
mode |= S_IXGRP; |
|
if (S_ISDIR(mode)) |
|
mode |= S_ISGID; |
|
if (chmod(path, mode) < 0) |
|
return -2; |
|
return 0; |
|
} |
|
|
|
int safe_create_leading_directories(char *path) |
|
{ |
|
char *pos = path; |
|
struct stat st; |
|
|
|
if (*pos == '/') |
|
pos++; |
|
|
|
while (pos) { |
|
pos = strchr(pos, '/'); |
|
if (!pos) |
|
break; |
|
*pos = 0; |
|
if (!stat(path, &st)) { |
|
/* path exists */ |
|
if (!S_ISDIR(st.st_mode)) { |
|
*pos = '/'; |
|
return -3; |
|
} |
|
} |
|
else if (mkdir(path, 0777)) { |
|
*pos = '/'; |
|
return -1; |
|
} |
|
else if (adjust_shared_perm(path)) { |
|
*pos = '/'; |
|
return -2; |
|
} |
|
*pos++ = '/'; |
|
} |
|
return 0; |
|
} |
|
|
|
char * sha1_to_hex(const unsigned char *sha1) |
|
{ |
|
static char buffer[50]; |
|
static const char hex[] = "0123456789abcdef"; |
|
char *buf = buffer; |
|
int i; |
|
|
|
for (i = 0; i < 20; i++) { |
|
unsigned int val = *sha1++; |
|
*buf++ = hex[val >> 4]; |
|
*buf++ = hex[val & 0xf]; |
|
} |
|
*buf = '\0'; |
|
|
|
return buffer; |
|
} |
|
|
|
static void fill_sha1_path(char *pathbuf, const unsigned char *sha1) |
|
{ |
|
int i; |
|
for (i = 0; i < 20; i++) { |
|
static char hex[] = "0123456789abcdef"; |
|
unsigned int val = sha1[i]; |
|
char *pos = pathbuf + i*2 + (i > 0); |
|
*pos++ = hex[val >> 4]; |
|
*pos = hex[val & 0xf]; |
|
} |
|
} |
|
|
|
/* |
|
* NOTE! This returns a statically allocated buffer, so you have to be |
|
* careful about using it. Do a "strdup()" 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) |
|
{ |
|
static char *name, *base; |
|
|
|
if (!base) { |
|
const char *sha1_file_directory = get_object_directory(); |
|
int len = strlen(sha1_file_directory); |
|
base = xmalloc(len + 60); |
|
memcpy(base, sha1_file_directory, len); |
|
memset(base+len, 0, 60); |
|
base[len] = '/'; |
|
base[len+3] = '/'; |
|
name = base + len + 1; |
|
} |
|
fill_sha1_path(name, sha1); |
|
return base; |
|
} |
|
|
|
char *sha1_pack_name(const unsigned char *sha1) |
|
{ |
|
static const char hex[] = "0123456789abcdef"; |
|
static char *name, *base, *buf; |
|
int i; |
|
|
|
if (!base) { |
|
const char *sha1_file_directory = get_object_directory(); |
|
int len = strlen(sha1_file_directory); |
|
base = xmalloc(len + 60); |
|
sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory); |
|
name = base + len + 11; |
|
} |
|
|
|
buf = name; |
|
|
|
for (i = 0; i < 20; i++) { |
|
unsigned int val = *sha1++; |
|
*buf++ = hex[val >> 4]; |
|
*buf++ = hex[val & 0xf]; |
|
} |
|
|
|
return base; |
|
} |
|
|
|
char *sha1_pack_index_name(const unsigned char *sha1) |
|
{ |
|
static const char hex[] = "0123456789abcdef"; |
|
static char *name, *base, *buf; |
|
int i; |
|
|
|
if (!base) { |
|
const char *sha1_file_directory = get_object_directory(); |
|
int len = strlen(sha1_file_directory); |
|
base = xmalloc(len + 60); |
|
sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory); |
|
name = base + len + 11; |
|
} |
|
|
|
buf = name; |
|
|
|
for (i = 0; i < 20; i++) { |
|
unsigned int val = *sha1++; |
|
*buf++ = hex[val >> 4]; |
|
*buf++ = hex[val & 0xf]; |
|
} |
|
|
|
return base; |
|
} |
|
|
|
struct alternate_object_database *alt_odb_list; |
|
static struct alternate_object_database **alt_odb_tail; |
|
|
|
/* |
|
* Prepare alternate object database registry. |
|
* |
|
* The variable alt_odb_list points at the list of struct |
|
* alternate_object_database. The elements on this list come from |
|
* non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT |
|
* environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates, |
|
* whose contents is similar to that environment variable but can be |
|
* LF separated. Its base points at a statically allocated buffer that |
|
* contains "/the/directory/corresponding/to/.git/objects/...", while |
|
* its name points just after the slash at the end of ".git/objects/" |
|
* in the example above, and has enough space to hold 40-byte hex |
|
* SHA1, an extra slash for the first level indirection, and the |
|
* terminating NUL. |
|
*/ |
|
static void link_alt_odb_entries(const char *alt, const char *ep, int sep, |
|
const char *relative_base) |
|
{ |
|
const char *cp, *last; |
|
struct alternate_object_database *ent; |
|
const char *objdir = get_object_directory(); |
|
int base_len = -1; |
|
|
|
last = alt; |
|
while (last < ep) { |
|
cp = last; |
|
if (cp < ep && *cp == '#') { |
|
while (cp < ep && *cp != sep) |
|
cp++; |
|
last = cp + 1; |
|
continue; |
|
} |
|
for ( ; cp < ep && *cp != sep; cp++) |
|
; |
|
if (last != cp) { |
|
struct stat st; |
|
struct alternate_object_database *alt; |
|
/* 43 = 40-byte + 2 '/' + terminating NUL */ |
|
int pfxlen = cp - last; |
|
int entlen = pfxlen + 43; |
|
|
|
if (*last != '/' && relative_base) { |
|
/* Relative alt-odb */ |
|
if (base_len < 0) |
|
base_len = strlen(relative_base) + 1; |
|
entlen += base_len; |
|
pfxlen += base_len; |
|
} |
|
ent = xmalloc(sizeof(*ent) + entlen); |
|
|
|
if (*last != '/' && relative_base) { |
|
memcpy(ent->base, relative_base, base_len - 1); |
|
ent->base[base_len - 1] = '/'; |
|
memcpy(ent->base + base_len, |
|
last, cp - last); |
|
} |
|
else |
|
memcpy(ent->base, last, pfxlen); |
|
|
|
ent->name = ent->base + pfxlen + 1; |
|
ent->base[pfxlen + 3] = '/'; |
|
ent->base[pfxlen] = ent->base[entlen-1] = 0; |
|
|
|
/* Detect cases where alternate disappeared */ |
|
if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) { |
|
error("object directory %s does not exist; " |
|
"check .git/objects/info/alternates.", |
|
ent->base); |
|
goto bad; |
|
} |
|
ent->base[pfxlen] = '/'; |
|
|
|
/* Prevent the common mistake of listing the same |
|
* thing twice, or object directory itself. |
|
*/ |
|
for (alt = alt_odb_list; alt; alt = alt->next) |
|
if (!memcmp(ent->base, alt->base, pfxlen)) |
|
goto bad; |
|
if (!memcmp(ent->base, objdir, pfxlen)) { |
|
bad: |
|
free(ent); |
|
} |
|
else { |
|
*alt_odb_tail = ent; |
|
alt_odb_tail = &(ent->next); |
|
ent->next = NULL; |
|
} |
|
} |
|
while (cp < ep && *cp == sep) |
|
cp++; |
|
last = cp; |
|
} |
|
} |
|
|
|
void prepare_alt_odb(void) |
|
{ |
|
char path[PATH_MAX]; |
|
char *map; |
|
int fd; |
|
struct stat st; |
|
char *alt; |
|
|
|
alt = getenv(ALTERNATE_DB_ENVIRONMENT); |
|
if (!alt) alt = ""; |
|
|
|
if (alt_odb_tail) |
|
return; |
|
alt_odb_tail = &alt_odb_list; |
|
link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL); |
|
|
|
sprintf(path, "%s/info/alternates", get_object_directory()); |
|
fd = open(path, O_RDONLY); |
|
if (fd < 0) |
|
return; |
|
if (fstat(fd, &st) || (st.st_size == 0)) { |
|
close(fd); |
|
return; |
|
} |
|
map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
|
close(fd); |
|
if (map == MAP_FAILED) |
|
return; |
|
|
|
link_alt_odb_entries(map, map + st.st_size, '\n', |
|
get_object_directory()); |
|
munmap(map, st.st_size); |
|
} |
|
|
|
static char *find_sha1_file(const unsigned char *sha1, struct stat *st) |
|
{ |
|
char *name = sha1_file_name(sha1); |
|
struct alternate_object_database *alt; |
|
|
|
if (!stat(name, st)) |
|
return name; |
|
prepare_alt_odb(); |
|
for (alt = alt_odb_list; alt; alt = alt->next) { |
|
name = alt->name; |
|
fill_sha1_path(name, sha1); |
|
if (!stat(alt->base, st)) |
|
return alt->base; |
|
} |
|
return NULL; |
|
} |
|
|
|
#define PACK_MAX_SZ (1<<26) |
|
static int pack_used_ctr; |
|
static unsigned long pack_mapped; |
|
struct packed_git *packed_git; |
|
|
|
static int check_packed_git_idx(const char *path, unsigned long *idx_size_, |
|
void **idx_map_) |
|
{ |
|
void *idx_map; |
|
unsigned int *index; |
|
unsigned long idx_size; |
|
int nr, i; |
|
int fd = open(path, O_RDONLY); |
|
struct stat st; |
|
if (fd < 0) |
|
return -1; |
|
if (fstat(fd, &st)) { |
|
close(fd); |
|
return -1; |
|
} |
|
idx_size = st.st_size; |
|
idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); |
|
close(fd); |
|
if (idx_map == MAP_FAILED) |
|
return -1; |
|
|
|
index = idx_map; |
|
*idx_map_ = idx_map; |
|
*idx_size_ = idx_size; |
|
|
|
/* check index map */ |
|
if (idx_size < 4*256 + 20 + 20) |
|
return error("index file too small"); |
|
nr = 0; |
|
for (i = 0; i < 256; i++) { |
|
unsigned int n = ntohl(index[i]); |
|
if (n < nr) |
|
return error("non-monotonic index"); |
|
nr = n; |
|
} |
|
|
|
/* |
|
* Total size: |
|
* - 256 index entries 4 bytes each |
|
* - 24-byte entries * nr (20-byte sha1 + 4-byte offset) |
|
* - 20-byte SHA1 of the packfile |
|
* - 20-byte SHA1 file checksum |
|
*/ |
|
if (idx_size != 4*256 + nr * 24 + 20 + 20) |
|
return error("wrong index file size"); |
|
|
|
return 0; |
|
} |
|
|
|
static int unuse_one_packed_git(void) |
|
{ |
|
struct packed_git *p, *lru = NULL; |
|
|
|
for (p = packed_git; p; p = p->next) { |
|
if (p->pack_use_cnt || !p->pack_base) |
|
continue; |
|
if (!lru || p->pack_last_used < lru->pack_last_used) |
|
lru = p; |
|
} |
|
if (!lru) |
|
return 0; |
|
munmap(lru->pack_base, lru->pack_size); |
|
lru->pack_base = NULL; |
|
return 1; |
|
} |
|
|
|
void unuse_packed_git(struct packed_git *p) |
|
{ |
|
p->pack_use_cnt--; |
|
} |
|
|
|
int use_packed_git(struct packed_git *p) |
|
{ |
|
if (!p->pack_size) { |
|
struct stat st; |
|
// We created the struct before we had the pack |
|
stat(p->pack_name, &st); |
|
if (!S_ISREG(st.st_mode)) |
|
die("packfile %s not a regular file", p->pack_name); |
|
p->pack_size = st.st_size; |
|
} |
|
if (!p->pack_base) { |
|
int fd; |
|
struct stat st; |
|
void *map; |
|
|
|
pack_mapped += p->pack_size; |
|
while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git()) |
|
; /* nothing */ |
|
fd = open(p->pack_name, O_RDONLY); |
|
if (fd < 0) |
|
die("packfile %s cannot be opened", p->pack_name); |
|
if (fstat(fd, &st)) { |
|
close(fd); |
|
die("packfile %s cannot be opened", p->pack_name); |
|
} |
|
if (st.st_size != p->pack_size) |
|
die("packfile %s size mismatch.", p->pack_name); |
|
map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0); |
|
close(fd); |
|
if (map == MAP_FAILED) |
|
die("packfile %s cannot be mapped.", p->pack_name); |
|
p->pack_base = map; |
|
|
|
/* Check if the pack file matches with the index file. |
|
* this is cheap. |
|
*/ |
|
if (memcmp((char*)(p->index_base) + p->index_size - 40, |
|
p->pack_base + p->pack_size - 20, 20)) { |
|
|
|
die("packfile %s does not match index.", p->pack_name); |
|
} |
|
} |
|
p->pack_last_used = pack_used_ctr++; |
|
p->pack_use_cnt++; |
|
return 0; |
|
} |
|
|
|
struct packed_git *add_packed_git(char *path, int path_len, int local) |
|
{ |
|
struct stat st; |
|
struct packed_git *p; |
|
unsigned long idx_size; |
|
void *idx_map; |
|
unsigned char sha1[20]; |
|
|
|
if (check_packed_git_idx(path, &idx_size, &idx_map)) |
|
return NULL; |
|
|
|
/* do we have a corresponding .pack file? */ |
|
strcpy(path + path_len - 4, ".pack"); |
|
if (stat(path, &st) || !S_ISREG(st.st_mode)) { |
|
munmap(idx_map, idx_size); |
|
return NULL; |
|
} |
|
/* ok, it looks sane as far as we can check without |
|
* actually mapping the pack file. |
|
*/ |
|
p = xmalloc(sizeof(*p) + path_len + 2); |
|
strcpy(p->pack_name, path); |
|
p->index_size = idx_size; |
|
p->pack_size = st.st_size; |
|
p->index_base = idx_map; |
|
p->next = NULL; |
|
p->pack_base = NULL; |
|
p->pack_last_used = 0; |
|
p->pack_use_cnt = 0; |
|
p->pack_local = local; |
|
if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1)) |
|
memcpy(p->sha1, sha1, 20); |
|
return p; |
|
} |
|
|
|
struct packed_git *parse_pack_index(unsigned char *sha1) |
|
{ |
|
char *path = sha1_pack_index_name(sha1); |
|
return parse_pack_index_file(sha1, path); |
|
} |
|
|
|
struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path) |
|
{ |
|
struct packed_git *p; |
|
unsigned long idx_size; |
|
void *idx_map; |
|
char *path; |
|
|
|
if (check_packed_git_idx(idx_path, &idx_size, &idx_map)) |
|
return NULL; |
|
|
|
path = sha1_pack_name(sha1); |
|
|
|
p = xmalloc(sizeof(*p) + strlen(path) + 2); |
|
strcpy(p->pack_name, path); |
|
p->index_size = idx_size; |
|
p->pack_size = 0; |
|
p->index_base = idx_map; |
|
p->next = NULL; |
|
p->pack_base = NULL; |
|
p->pack_last_used = 0; |
|
p->pack_use_cnt = 0; |
|
memcpy(p->sha1, sha1, 20); |
|
return p; |
|
} |
|
|
|
void install_packed_git(struct packed_git *pack) |
|
{ |
|
pack->next = packed_git; |
|
packed_git = pack; |
|
} |
|
|
|
static void prepare_packed_git_one(char *objdir, int local) |
|
{ |
|
char path[PATH_MAX]; |
|
int len; |
|
DIR *dir; |
|
struct dirent *de; |
|
|
|
sprintf(path, "%s/pack", objdir); |
|
len = strlen(path); |
|
dir = opendir(path); |
|
if (!dir) { |
|
if (errno != ENOENT) |
|
error("unable to open object pack directory: %s: %s", |
|
path, strerror(errno)); |
|
return; |
|
} |
|
path[len++] = '/'; |
|
while ((de = readdir(dir)) != NULL) { |
|
int namelen = strlen(de->d_name); |
|
struct packed_git *p; |
|
|
|
if (strcmp(de->d_name + namelen - 4, ".idx")) |
|
continue; |
|
|
|
/* we have .idx. Is it a file we can map? */ |
|
strcpy(path + len, de->d_name); |
|
p = add_packed_git(path, len + namelen, local); |
|
if (!p) |
|
continue; |
|
p->next = packed_git; |
|
packed_git = p; |
|
} |
|
closedir(dir); |
|
} |
|
|
|
void prepare_packed_git(void) |
|
{ |
|
static int run_once = 0; |
|
struct alternate_object_database *alt; |
|
|
|
if (run_once) |
|
return; |
|
prepare_packed_git_one(get_object_directory(), 1); |
|
prepare_alt_odb(); |
|
for (alt = alt_odb_list; alt; alt = alt->next) { |
|
alt->name[-1] = 0; |
|
prepare_packed_git_one(alt->base, 0); |
|
alt->name[-1] = '/'; |
|
} |
|
run_once = 1; |
|
} |
|
|
|
int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type) |
|
{ |
|
char header[100]; |
|
unsigned char real_sha1[20]; |
|
SHA_CTX c; |
|
|
|
SHA1_Init(&c); |
|
SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size)); |
|
SHA1_Update(&c, map, size); |
|
SHA1_Final(real_sha1, &c); |
|
return memcmp(sha1, real_sha1, 20) ? -1 : 0; |
|
} |
|
|
|
static void *map_sha1_file_internal(const unsigned char *sha1, |
|
unsigned long *size) |
|
{ |
|
struct stat st; |
|
void *map; |
|
int fd; |
|
char *filename = find_sha1_file(sha1, &st); |
|
|
|
if (!filename) { |
|
return NULL; |
|
} |
|
|
|
fd = open(filename, O_RDONLY | sha1_file_open_flag); |
|
if (fd < 0) { |
|
/* See if it works without O_NOATIME */ |
|
switch (sha1_file_open_flag) { |
|
default: |
|
fd = open(filename, O_RDONLY); |
|
if (fd >= 0) |
|
break; |
|
/* Fallthrough */ |
|
case 0: |
|
return NULL; |
|
} |
|
|
|
/* If it failed once, it will probably fail again. |
|
* Stop using O_NOATIME |
|
*/ |
|
sha1_file_open_flag = 0; |
|
} |
|
map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
|
close(fd); |
|
if (map == MAP_FAILED) |
|
return NULL; |
|
*size = st.st_size; |
|
return map; |
|
} |
|
|
|
int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size) |
|
{ |
|
/* Get the data stream */ |
|
memset(stream, 0, sizeof(*stream)); |
|
stream->next_in = map; |
|
stream->avail_in = mapsize; |
|
stream->next_out = buffer; |
|
stream->avail_out = size; |
|
|
|
inflateInit(stream); |
|
return inflate(stream, 0); |
|
} |
|
|
|
static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size) |
|
{ |
|
int bytes = strlen(buffer) + 1; |
|
unsigned char *buf = xmalloc(1+size); |
|
|
|
memcpy(buf, buffer + bytes, stream->total_out - bytes); |
|
bytes = stream->total_out - bytes; |
|
if (bytes < size) { |
|
stream->next_out = buf + bytes; |
|
stream->avail_out = size - bytes; |
|
while (inflate(stream, Z_FINISH) == Z_OK) |
|
/* nothing */; |
|
} |
|
buf[size] = 0; |
|
inflateEnd(stream); |
|
return buf; |
|
} |
|
|
|
/* |
|
* We used to just use "sscanf()", but that's actually way |
|
* too permissive for what we want to check. So do an anal |
|
* object header parse by hand. |
|
*/ |
|
int parse_sha1_header(char *hdr, char *type, unsigned long *sizep) |
|
{ |
|
int i; |
|
unsigned long size; |
|
|
|
/* |
|
* The type can be at most ten bytes (including the |
|
* terminating '\0' that we add), and is followed by |
|
* a space. |
|
*/ |
|
i = 10; |
|
for (;;) { |
|
char c = *hdr++; |
|
if (c == ' ') |
|
break; |
|
if (!--i) |
|
return -1; |
|
*type++ = c; |
|
} |
|
*type = 0; |
|
|
|
/* |
|
* The length must follow immediately, and be in canonical |
|
* decimal format (ie "010" is not valid). |
|
*/ |
|
size = *hdr++ - '0'; |
|
if (size > 9) |
|
return -1; |
|
if (size) { |
|
for (;;) { |
|
unsigned long c = *hdr - '0'; |
|
if (c > 9) |
|
break; |
|
hdr++; |
|
size = size * 10 + c; |
|
} |
|
} |
|
*sizep = size; |
|
|
|
/* |
|
* The length must be followed by a zero byte |
|
*/ |
|
return *hdr ? -1 : 0; |
|
} |
|
|
|
void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size) |
|
{ |
|
int ret; |
|
z_stream stream; |
|
char hdr[8192]; |
|
|
|
ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)); |
|
if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0) |
|
return NULL; |
|
|
|
return unpack_sha1_rest(&stream, hdr, *size); |
|
} |
|
|
|
/* forward declaration for a mutually recursive function */ |
|
static int packed_object_info(struct pack_entry *entry, |
|
char *type, unsigned long *sizep); |
|
|
|
static int packed_delta_info(unsigned char *base_sha1, |
|
unsigned long delta_size, |
|
unsigned long left, |
|
char *type, |
|
unsigned long *sizep, |
|
struct packed_git *p) |
|
{ |
|
struct pack_entry base_ent; |
|
|
|
if (left < 20) |
|
die("truncated pack file"); |
|
|
|
/* The base entry _must_ be in the same pack */ |
|
if (!find_pack_entry_one(base_sha1, &base_ent, p)) |
|
die("failed to find delta-pack base object %s", |
|
sha1_to_hex(base_sha1)); |
|
|
|
/* We choose to only get the type of the base object and |
|
* ignore potentially corrupt pack file that expects the delta |
|
* based on a base with a wrong size. This saves tons of |
|
* inflate() calls. |
|
*/ |
|
|
|
if (packed_object_info(&base_ent, type, NULL)) |
|
die("cannot get info for delta-pack base"); |
|
|
|
if (sizep) { |
|
const unsigned char *data; |
|
unsigned char delta_head[64]; |
|
unsigned long result_size; |
|
z_stream stream; |
|
int st; |
|
|
|
memset(&stream, 0, sizeof(stream)); |
|
|
|
data = stream.next_in = base_sha1 + 20; |
|
stream.avail_in = left - 20; |
|
stream.next_out = delta_head; |
|
stream.avail_out = sizeof(delta_head); |
|
|
|
inflateInit(&stream); |
|
st = inflate(&stream, Z_FINISH); |
|
inflateEnd(&stream); |
|
if ((st != Z_STREAM_END) && |
|
stream.total_out != sizeof(delta_head)) |
|
die("delta data unpack-initial failed"); |
|
|
|
/* Examine the initial part of the delta to figure out |
|
* the result size. |
|
*/ |
|
data = delta_head; |
|
get_delta_hdr_size(&data); /* ignore base size */ |
|
|
|
/* Read the result size */ |
|
result_size = get_delta_hdr_size(&data); |
|
*sizep = result_size; |
|
} |
|
return 0; |
|
} |
|
|
|
static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset, |
|
enum object_type *type, unsigned long *sizep) |
|
{ |
|
unsigned shift; |
|
unsigned char *pack, c; |
|
unsigned long size; |
|
|
|
if (offset >= p->pack_size) |
|
die("object offset outside of pack file"); |
|
|
|
pack = p->pack_base + offset; |
|
c = *pack++; |
|
offset++; |
|
*type = (c >> 4) & 7; |
|
size = c & 15; |
|
shift = 4; |
|
while (c & 0x80) { |
|
if (offset >= p->pack_size) |
|
die("object offset outside of pack file"); |
|
c = *pack++; |
|
offset++; |
|
size += (c & 0x7f) << shift; |
|
shift += 7; |
|
} |
|
*sizep = size; |
|
return offset; |
|
} |
|
|
|
int check_reuse_pack_delta(struct packed_git *p, unsigned long offset, |
|
unsigned char *base, unsigned long *sizep, |
|
enum object_type *kindp) |
|
{ |
|
unsigned long ptr; |
|
int status = -1; |
|
|
|
use_packed_git(p); |
|
ptr = offset; |
|
ptr = unpack_object_header(p, ptr, kindp, sizep); |
|
if (*kindp != OBJ_DELTA) |
|
goto done; |
|
memcpy(base, p->pack_base + ptr, 20); |
|
status = 0; |
|
done: |
|
unuse_packed_git(p); |
|
return status; |
|
} |
|
|
|
void packed_object_info_detail(struct pack_entry *e, |
|
char *type, |
|
unsigned long *size, |
|
unsigned long *store_size, |
|
unsigned int *delta_chain_length, |
|
unsigned char *base_sha1) |
|
{ |
|
struct packed_git *p = e->p; |
|
unsigned long offset, left; |
|
unsigned char *pack; |
|
enum object_type kind; |
|
|
|
offset = unpack_object_header(p, e->offset, &kind, size); |
|
pack = p->pack_base + offset; |
|
left = p->pack_size - offset; |
|
if (kind != OBJ_DELTA) |
|
*delta_chain_length = 0; |
|
else { |
|
unsigned int chain_length = 0; |
|
memcpy(base_sha1, pack, 20); |
|
do { |
|
struct pack_entry base_ent; |
|
unsigned long junk; |
|
|
|
find_pack_entry_one(pack, &base_ent, p); |
|
offset = unpack_object_header(p, base_ent.offset, |
|
&kind, &junk); |
|
pack = p->pack_base + offset; |
|
chain_length++; |
|
} while (kind == OBJ_DELTA); |
|
*delta_chain_length = chain_length; |
|
} |
|
switch (kind) { |
|
case OBJ_COMMIT: |
|
strcpy(type, commit_type); |
|
break; |
|
case OBJ_TREE: |
|
strcpy(type, tree_type); |
|
break; |
|
case OBJ_BLOB: |
|
strcpy(type, blob_type); |
|
break; |
|
case OBJ_TAG: |
|
strcpy(type, tag_type); |
|
break; |
|
default: |
|
die("corrupted pack file %s containing object of kind %d", |
|
p->pack_name, kind); |
|
} |
|
*store_size = 0; /* notyet */ |
|
} |
|
|
|
static int packed_object_info(struct pack_entry *entry, |
|
char *type, unsigned long *sizep) |
|
{ |
|
struct packed_git *p = entry->p; |
|
unsigned long offset, size, left; |
|
unsigned char *pack; |
|
enum object_type kind; |
|
int retval; |
|
|
|
if (use_packed_git(p)) |
|
die("cannot map packed file"); |
|
|
|
offset = unpack_object_header(p, entry->offset, &kind, &size); |
|
pack = p->pack_base + offset; |
|
left = p->pack_size - offset; |
|
|
|
switch (kind) { |
|
case OBJ_DELTA: |
|
retval = packed_delta_info(pack, size, left, type, sizep, p); |
|
unuse_packed_git(p); |
|
return retval; |
|
case OBJ_COMMIT: |
|
strcpy(type, commit_type); |
|
break; |
|
case OBJ_TREE: |
|
strcpy(type, tree_type); |
|
break; |
|
case OBJ_BLOB: |
|
strcpy(type, blob_type); |
|
break; |
|
case OBJ_TAG: |
|
strcpy(type, tag_type); |
|
break; |
|
default: |
|
die("corrupted pack file %s containing object of kind %d", |
|
p->pack_name, kind); |
|
} |
|
if (sizep) |
|
*sizep = size; |
|
unuse_packed_git(p); |
|
return 0; |
|
} |
|
|
|
/* forward declaration for a mutually recursive function */ |
|
static void *unpack_entry(struct pack_entry *, char *, unsigned long *); |
|
|
|
static void *unpack_delta_entry(unsigned char *base_sha1, |
|
unsigned long delta_size, |
|
unsigned long left, |
|
char *type, |
|
unsigned long *sizep, |
|
struct packed_git *p) |
|
{ |
|
struct pack_entry base_ent; |
|
void *data, *delta_data, *result, *base; |
|
unsigned long data_size, result_size, base_size; |
|
z_stream stream; |
|
int st; |
|
|
|
if (left < 20) |
|
die("truncated pack file"); |
|
|
|
/* The base entry _must_ be in the same pack */ |
|
if (!find_pack_entry_one(base_sha1, &base_ent, p)) |
|
die("failed to find delta-pack base object %s", |
|
sha1_to_hex(base_sha1)); |
|
base = unpack_entry_gently(&base_ent, type, &base_size); |
|
if (!base) |
|
die("failed to read delta-pack base object %s", |
|
sha1_to_hex(base_sha1)); |
|
|
|
data = base_sha1 + 20; |
|
data_size = left - 20; |
|
delta_data = xmalloc(delta_size); |
|
|
|
memset(&stream, 0, sizeof(stream)); |
|
|
|
stream.next_in = data; |
|
stream.avail_in = data_size; |
|
stream.next_out = delta_data; |
|
stream.avail_out = delta_size; |
|
|
|
inflateInit(&stream); |
|
st = inflate(&stream, Z_FINISH); |
|
inflateEnd(&stream); |
|
if ((st != Z_STREAM_END) || stream.total_out != delta_size) |
|
die("delta data unpack failed"); |
|
|
|
result = patch_delta(base, base_size, |
|
delta_data, delta_size, |
|
&result_size); |
|
if (!result) |
|
die("failed to apply delta"); |
|
free(delta_data); |
|
free(base); |
|
*sizep = result_size; |
|
return result; |
|
} |
|
|
|
static void *unpack_non_delta_entry(unsigned char *data, |
|
unsigned long size, |
|
unsigned long left) |
|
{ |
|
int st; |
|
z_stream stream; |
|
unsigned char *buffer; |
|
|
|
buffer = xmalloc(size + 1); |
|
buffer[size] = 0; |
|
memset(&stream, 0, sizeof(stream)); |
|
stream.next_in = data; |
|
stream.avail_in = left; |
|
stream.next_out = buffer; |
|
stream.avail_out = size; |
|
|
|
inflateInit(&stream); |
|
st = inflate(&stream, Z_FINISH); |
|
inflateEnd(&stream); |
|
if ((st != Z_STREAM_END) || stream.total_out != size) { |
|
free(buffer); |
|
return NULL; |
|
} |
|
|
|
return buffer; |
|
} |
|
|
|
static void *unpack_entry(struct pack_entry *entry, |
|
char *type, unsigned long *sizep) |
|
{ |
|
struct packed_git *p = entry->p; |
|
void *retval; |
|
|
|
if (use_packed_git(p)) |
|
die("cannot map packed file"); |
|
retval = unpack_entry_gently(entry, type, sizep); |
|
unuse_packed_git(p); |
|
if (!retval) |
|
die("corrupted pack file %s", p->pack_name); |
|
return retval; |
|
} |
|
|
|
/* The caller is responsible for use_packed_git()/unuse_packed_git() pair */ |
|
void *unpack_entry_gently(struct pack_entry *entry, |
|
char *type, unsigned long *sizep) |
|
{ |
|
struct packed_git *p = entry->p; |
|
unsigned long offset, size, left; |
|
unsigned char *pack; |
|
enum object_type kind; |
|
void *retval; |
|
|
|
offset = unpack_object_header(p, entry->offset, &kind, &size); |
|
pack = p->pack_base + offset; |
|
left = p->pack_size - offset; |
|
switch (kind) { |
|
case OBJ_DELTA: |
|
retval = unpack_delta_entry(pack, size, left, type, sizep, p); |
|
return retval; |
|
case OBJ_COMMIT: |
|
strcpy(type, commit_type); |
|
break; |
|
case OBJ_TREE: |
|
strcpy(type, tree_type); |
|
break; |
|
case OBJ_BLOB: |
|
strcpy(type, blob_type); |
|
break; |
|
case OBJ_TAG: |
|
strcpy(type, tag_type); |
|
break; |
|
default: |
|
return NULL; |
|
} |
|
*sizep = size; |
|
retval = unpack_non_delta_entry(pack, size, left); |
|
return retval; |
|
} |
|
|
|
int num_packed_objects(const struct packed_git *p) |
|
{ |
|
/* See check_packed_git_idx() */ |
|
return (p->index_size - 20 - 20 - 4*256) / 24; |
|
} |
|
|
|
int nth_packed_object_sha1(const struct packed_git *p, int n, |
|
unsigned char* sha1) |
|
{ |
|
void *index = p->index_base + 256; |
|
if (n < 0 || num_packed_objects(p) <= n) |
|
return -1; |
|
memcpy(sha1, (index + 24 * n + 4), 20); |
|
return 0; |
|
} |
|
|
|
int find_pack_entry_one(const unsigned char *sha1, |
|
struct pack_entry *e, struct packed_git *p) |
|
{ |
|
unsigned int *level1_ofs = p->index_base; |
|
int hi = ntohl(level1_ofs[*sha1]); |
|
int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1])); |
|
void *index = p->index_base + 256; |
|
|
|
do { |
|
int mi = (lo + hi) / 2; |
|
int cmp = memcmp(index + 24 * mi + 4, sha1, 20); |
|
if (!cmp) { |
|
e->offset = ntohl(*((int*)(index + 24 * mi))); |
|
memcpy(e->sha1, sha1, 20); |
|
e->p = p; |
|
return 1; |
|
} |
|
if (cmp > 0) |
|
hi = mi; |
|
else |
|
lo = mi+1; |
|
} while (lo < hi); |
|
return 0; |
|
} |
|
|
|
static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e) |
|
{ |
|
struct packed_git *p; |
|
prepare_packed_git(); |
|
|
|
for (p = packed_git; p; p = p->next) { |
|
if (find_pack_entry_one(sha1, e, p)) |
|
return 1; |
|
} |
|
return 0; |
|
} |
|
|
|
struct packed_git *find_sha1_pack(const unsigned char *sha1, |
|
struct packed_git *packs) |
|
{ |
|
struct packed_git *p; |
|
struct pack_entry e; |
|
|
|
for (p = packs; p; p = p->next) { |
|
if (find_pack_entry_one(sha1, &e, p)) |
|
return p; |
|
} |
|
return NULL; |
|
|
|
} |
|
|
|
int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep) |
|
{ |
|
int status; |
|
unsigned long mapsize, size; |
|
void *map; |
|
z_stream stream; |
|
char hdr[128]; |
|
|
|
map = map_sha1_file_internal(sha1, &mapsize); |
|
if (!map) { |
|
struct pack_entry e; |
|
|
|
if (!find_pack_entry(sha1, &e)) |
|
return error("unable to find %s", sha1_to_hex(sha1)); |
|
return packed_object_info(&e, type, sizep); |
|
} |
|
if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) |
|
status = error("unable to unpack %s header", |
|
sha1_to_hex(sha1)); |
|
if (parse_sha1_header(hdr, type, &size) < 0) |
|
status = error("unable to parse %s header", sha1_to_hex(sha1)); |
|
else { |
|
status = 0; |
|
if (sizep) |
|
*sizep = size; |
|
} |
|
inflateEnd(&stream); |
|
munmap(map, mapsize); |
|
return status; |
|
} |
|
|
|
static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size) |
|
{ |
|
struct pack_entry e; |
|
|
|
if (!find_pack_entry(sha1, &e)) { |
|
error("cannot read sha1_file for %s", sha1_to_hex(sha1)); |
|
return NULL; |
|
} |
|
return unpack_entry(&e, type, size); |
|
} |
|
|
|
void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) |
|
{ |
|
unsigned long mapsize; |
|
void *map, *buf; |
|
struct pack_entry e; |
|
|
|
if (find_pack_entry(sha1, &e)) |
|
return read_packed_sha1(sha1, type, size); |
|
map = map_sha1_file_internal(sha1, &mapsize); |
|
if (map) { |
|
buf = unpack_sha1_file(map, mapsize, type, size); |
|
munmap(map, mapsize); |
|
return buf; |
|
} |
|
return NULL; |
|
} |
|
|
|
void *read_object_with_reference(const unsigned char *sha1, |
|
const char *required_type, |
|
unsigned long *size, |
|
unsigned char *actual_sha1_return) |
|
{ |
|
char type[20]; |
|
void *buffer; |
|
unsigned long isize; |
|
unsigned char actual_sha1[20]; |
|
|
|
memcpy(actual_sha1, sha1, 20); |
|
while (1) { |
|
int ref_length = -1; |
|
const char *ref_type = NULL; |
|
|
|
buffer = read_sha1_file(actual_sha1, type, &isize); |
|
if (!buffer) |
|
return NULL; |
|
if (!strcmp(type, required_type)) { |
|
*size = isize; |
|
if (actual_sha1_return) |
|
memcpy(actual_sha1_return, actual_sha1, 20); |
|
return buffer; |
|
} |
|
/* Handle references */ |
|
else if (!strcmp(type, commit_type)) |
|
ref_type = "tree "; |
|
else if (!strcmp(type, tag_type)) |
|
ref_type = "object "; |
|
else { |
|
free(buffer); |
|
return NULL; |
|
} |
|
ref_length = strlen(ref_type); |
|
|
|
if (memcmp(buffer, ref_type, ref_length) || |
|
get_sha1_hex(buffer + ref_length, actual_sha1)) { |
|
free(buffer); |
|
return NULL; |
|
} |
|
free(buffer); |
|
/* Now we have the ID of the referred-to object in |
|
* actual_sha1. Check again. */ |
|
} |
|
} |
|
|
|
char *write_sha1_file_prepare(void *buf, |
|
unsigned long len, |
|
const char *type, |
|
unsigned char *sha1, |
|
unsigned char *hdr, |
|
int *hdrlen) |
|
{ |
|
SHA_CTX c; |
|
|
|
/* Generate the header */ |
|
*hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1; |
|
|
|
/* Sha1.. */ |
|
SHA1_Init(&c); |
|
SHA1_Update(&c, hdr, *hdrlen); |
|
SHA1_Update(&c, buf, len); |
|
SHA1_Final(sha1, &c); |
|
|
|
return sha1_file_name(sha1); |
|
} |
|
|
|
/* |
|
* Link the tempfile to the final place, possibly creating the |
|
* last directory level as you do so. |
|
* |
|
* Returns the errno on failure, 0 on success. |
|
*/ |
|
static int link_temp_to_file(const char *tmpfile, char *filename) |
|
{ |
|
int ret; |
|
|
|
if (!link(tmpfile, filename)) |
|
return 0; |
|
|
|
/* |
|
* Try to mkdir the last path component if that failed |
|
* with an ENOENT. |
|
* |
|
* Re-try the "link()" regardless of whether the mkdir |
|
* succeeds, since a race might mean that somebody |
|
* else succeeded. |
|
*/ |
|
ret = errno; |
|
if (ret == ENOENT) { |
|
char *dir = strrchr(filename, '/'); |
|
if (dir) { |
|
*dir = 0; |
|
mkdir(filename, 0777); |
|
if (adjust_shared_perm(filename)) |
|
return -2; |
|
*dir = '/'; |
|
if (!link(tmpfile, filename)) |
|
return 0; |
|
ret = errno; |
|
} |
|
} |
|
return ret; |
|
} |
|
|
|
/* |
|
* Move the just written object into its final resting place |
|
*/ |
|
int move_temp_to_file(const char *tmpfile, char *filename) |
|
{ |
|
int ret = link_temp_to_file(tmpfile, filename); |
|
|
|
/* |
|
* Coda hack - coda doesn't like cross-directory links, |
|
* so we fall back to a rename, which will mean that it |
|
* won't be able to check collisions, but that's not a |
|
* big deal. |
|
* |
|
* The same holds for FAT formatted media. |
|
* |
|
* When this succeeds, we just return 0. We have nothing |
|
* left to unlink. |
|
*/ |
|
if (ret && ret != EEXIST) { |
|
if (!rename(tmpfile, filename)) |
|
return 0; |
|
ret = errno; |
|
} |
|
unlink(tmpfile); |
|
if (ret) { |
|
if (ret != EEXIST) { |
|
fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret)); |
|
return -1; |
|
} |
|
/* FIXME!!! Collision check here ? */ |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1) |
|
{ |
|
int size; |
|
unsigned char *compressed; |
|
z_stream stream; |
|
unsigned char sha1[20]; |
|
char *filename; |
|
static char tmpfile[PATH_MAX]; |
|
unsigned char hdr[50]; |
|
int fd, hdrlen; |
|
|
|
/* Normally if we have it in the pack then we do not bother writing |
|
* it out into .git/objects/??/?{38} file. |
|
*/ |
|
filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen); |
|
if (returnsha1) |
|
memcpy(returnsha1, sha1, 20); |
|
if (has_sha1_file(sha1)) |
|
return 0; |
|
fd = open(filename, O_RDONLY); |
|
if (fd >= 0) { |
|
/* |
|
* FIXME!!! We might do collision checking here, but we'd |
|
* need to uncompress the old file and check it. Later. |
|
*/ |
|
close(fd); |
|
return 0; |
|
} |
|
|
|
if (errno != ENOENT) { |
|
fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno)); |
|
return -1; |
|
} |
|
|
|
snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
|
|
|
fd = mkstemp(tmpfile); |
|
if (fd < 0) { |
|
fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno)); |
|
return -1; |
|
} |
|
|
|
/* Set it up */ |
|
memset(&stream, 0, sizeof(stream)); |
|
deflateInit(&stream, Z_BEST_COMPRESSION); |
|
size = deflateBound(&stream, len+hdrlen); |
|
compressed = xmalloc(size); |
|
|
|
/* Compress it */ |
|
stream.next_out = compressed; |
|
stream.avail_out = size; |
|
|
|
/* First header.. */ |
|
stream.next_in = hdr; |
|
stream.avail_in = hdrlen; |
|
while (deflate(&stream, 0) == Z_OK) |
|
/* nothing */; |
|
|
|
/* Then the data itself.. */ |
|
stream.next_in = buf; |
|
stream.avail_in = len; |
|
while (deflate(&stream, Z_FINISH) == Z_OK) |
|
/* nothing */; |
|
deflateEnd(&stream); |
|
size = stream.total_out; |
|
|
|
if (write(fd, compressed, size) != size) |
|
die("unable to write file"); |
|
fchmod(fd, 0444); |
|
close(fd); |
|
free(compressed); |
|
|
|
return move_temp_to_file(tmpfile, filename); |
|
} |
|
|
|
int write_sha1_to_fd(int fd, const unsigned char *sha1) |
|
{ |
|
ssize_t size; |
|
unsigned long objsize; |
|
int posn = 0; |
|
void *map = map_sha1_file_internal(sha1, &objsize); |
|
void *buf = map; |
|
void *temp_obj = NULL; |
|
z_stream stream; |
|
|
|
if (!buf) { |
|
unsigned char *unpacked; |
|
unsigned long len; |
|
char type[20]; |
|
char hdr[50]; |
|
int hdrlen; |
|
// need to unpack and recompress it by itself |
|
unpacked = read_packed_sha1(sha1, type, &len); |
|
|
|
hdrlen = sprintf(hdr, "%s %lu", type, len) + 1; |
|
|
|
/* Set it up */ |
|
memset(&stream, 0, sizeof(stream)); |
|
deflateInit(&stream, Z_BEST_COMPRESSION); |
|
size = deflateBound(&stream, len + hdrlen); |
|
temp_obj = buf = xmalloc(size); |
|
|
|
/* Compress it */ |
|
stream.next_out = buf; |
|
stream.avail_out = size; |
|
|
|
/* First header.. */ |
|
stream.next_in = (void *)hdr; |
|
stream.avail_in = hdrlen; |
|
while (deflate(&stream, 0) == Z_OK) |
|
/* nothing */; |
|
|
|
/* Then the data itself.. */ |
|
stream.next_in = unpacked; |
|
stream.avail_in = len; |
|
while (deflate(&stream, Z_FINISH) == Z_OK) |
|
/* nothing */; |
|
deflateEnd(&stream); |
|
free(unpacked); |
|
|
|
objsize = stream.total_out; |
|
} |
|
|
|
do { |
|
size = write(fd, buf + posn, objsize - posn); |
|
if (size <= 0) { |
|
if (!size) { |
|
fprintf(stderr, "write closed\n"); |
|
} else { |
|
perror("write "); |
|
} |
|
return -1; |
|
} |
|
posn += size; |
|
} while (posn < objsize); |
|
|
|
if (map) |
|
munmap(map, objsize); |
|
if (temp_obj) |
|
free(temp_obj); |
|
|
|
return 0; |
|
} |
|
|
|
int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer, |
|
size_t bufsize, size_t *bufposn) |
|
{ |
|
char tmpfile[PATH_MAX]; |
|
int local; |
|
z_stream stream; |
|
unsigned char real_sha1[20]; |
|
unsigned char discard[4096]; |
|
int ret; |
|
SHA_CTX c; |
|
|
|
snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory()); |
|
|
|
local = mkstemp(tmpfile); |
|
if (local < 0) |
|
return error("Couldn't open %s for %s", |
|
tmpfile, sha1_to_hex(sha1)); |
|
|
|
memset(&stream, 0, sizeof(stream)); |
|
|
|
inflateInit(&stream); |
|
|
|
SHA1_Init(&c); |
|
|
|
do { |
|
ssize_t size; |
|
if (*bufposn) { |
|
stream.avail_in = *bufposn; |
|
stream.next_in = (unsigned char *) buffer; |
|
do { |
|
stream.next_out = discard; |
|
stream.avail_out = sizeof(discard); |
|
ret = inflate(&stream, Z_SYNC_FLUSH); |
|
SHA1_Update(&c, discard, sizeof(discard) - |
|
stream.avail_out); |
|
} while (stream.avail_in && ret == Z_OK); |
|
write(local, buffer, *bufposn - stream.avail_in); |
|
memmove(buffer, buffer + *bufposn - stream.avail_in, |
|
stream.avail_in); |
|
*bufposn = stream.avail_in; |
|
if (ret != Z_OK) |
|
break; |
|
} |
|
size = read(fd, buffer + *bufposn, bufsize - *bufposn); |
|
if (size <= 0) { |
|
close(local); |
|
unlink(tmpfile); |
|
if (!size) |
|
return error("Connection closed?"); |
|
perror("Reading from connection"); |
|
return -1; |
|
} |
|
*bufposn += size; |
|
} while (1); |
|
inflateEnd(&stream); |
|
|
|
close(local); |
|
SHA1_Final(real_sha1, &c); |
|
if (ret != Z_STREAM_END) { |
|
unlink(tmpfile); |
|
return error("File %s corrupted", sha1_to_hex(sha1)); |
|
} |
|
if (memcmp(sha1, real_sha1, 20)) { |
|
unlink(tmpfile); |
|
return error("File %s has bad hash", sha1_to_hex(sha1)); |
|
} |
|
|
|
return move_temp_to_file(tmpfile, sha1_file_name(sha1)); |
|
} |
|
|
|
int has_pack_index(const unsigned char *sha1) |
|
{ |
|
struct stat st; |
|
if (stat(sha1_pack_index_name(sha1), &st)) |
|
return 0; |
|
return 1; |
|
} |
|
|
|
int has_pack_file(const unsigned char *sha1) |
|
{ |
|
struct stat st; |
|
if (stat(sha1_pack_name(sha1), &st)) |
|
return 0; |
|
return 1; |
|
} |
|
|
|
int has_sha1_pack(const unsigned char *sha1) |
|
{ |
|
struct pack_entry e; |
|
return find_pack_entry(sha1, &e); |
|
} |
|
|
|
int has_sha1_file(const unsigned char *sha1) |
|
{ |
|
struct stat st; |
|
struct pack_entry e; |
|
|
|
if (find_pack_entry(sha1, &e)) |
|
return 1; |
|
return find_sha1_file(sha1, &st) ? 1 : 0; |
|
} |
|
|
|
int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object) |
|
{ |
|
unsigned long size = 4096; |
|
char *buf = malloc(size); |
|
int iret, ret; |
|
unsigned long off = 0; |
|
unsigned char hdr[50]; |
|
int hdrlen; |
|
do { |
|
iret = read(fd, buf + off, size - off); |
|
if (iret > 0) { |
|
off += iret; |
|
if (off == size) { |
|
size *= 2; |
|
buf = realloc(buf, size); |
|
} |
|
} |
|
} while (iret > 0); |
|
if (iret < 0) { |
|
free(buf); |
|
return -1; |
|
} |
|
if (!type) |
|
type = blob_type; |
|
if (write_object) |
|
ret = write_sha1_file(buf, off, type, sha1); |
|
else { |
|
write_sha1_file_prepare(buf, off, type, sha1, hdr, &hdrlen); |
|
ret = 0; |
|
} |
|
free(buf); |
|
return ret; |
|
} |
|
|
|
int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type) |
|
{ |
|
unsigned long size = st->st_size; |
|
void *buf; |
|
int ret; |
|
unsigned char hdr[50]; |
|
int hdrlen; |
|
|
|
buf = ""; |
|
if (size) |
|
buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); |
|
close(fd); |
|
if (buf == MAP_FAILED) |
|
return -1; |
|
|
|
if (!type) |
|
type = blob_type; |
|
if (write_object) |
|
ret = write_sha1_file(buf, size, type, sha1); |
|
else { |
|
write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen); |
|
ret = 0; |
|
} |
|
if (size) |
|
munmap(buf, size); |
|
return ret; |
|
} |
|
|
|
int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object) |
|
{ |
|
int fd; |
|
char *target; |
|
|
|
switch (st->st_mode & S_IFMT) { |
|
case S_IFREG: |
|
fd = open(path, O_RDONLY); |
|
if (fd < 0) |
|
return error("open(\"%s\"): %s", path, |
|
strerror(errno)); |
|
if (index_fd(sha1, fd, st, write_object, NULL) < 0) |
|
return error("%s: failed to insert into database", |
|
path); |
|
break; |
|
case S_IFLNK: |
|
target = xmalloc(st->st_size+1); |
|
if (readlink(path, target, st->st_size+1) != st->st_size) { |
|
char *errstr = strerror(errno); |
|
free(target); |
|
return error("readlink(\"%s\"): %s", path, |
|
errstr); |
|
} |
|
if (!write_object) { |
|
unsigned char hdr[50]; |
|
int hdrlen; |
|
write_sha1_file_prepare(target, st->st_size, blob_type, |
|
sha1, hdr, &hdrlen); |
|
} else if (write_sha1_file(target, st->st_size, blob_type, sha1)) |
|
return error("%s: failed to insert into database", |
|
path); |
|
free(target); |
|
break; |
|
default: |
|
return error("%s: unsupported file type", path); |
|
} |
|
return 0; |
|
}
|
|
|