* This handles basic git sha1 object files - packing, unpacking,
* creation etc.
*/
-#include <sys/types.h>
-#include <dirent.h>
#include "cache.h"
#include "delta.h"
#include "pack.h"
#endif
#endif
+const unsigned char null_sha1[20] = { 0, };
+
static unsigned int sha1_file_open_flag = O_NOATIME;
static unsigned hexval(char c)
return 0;
}
-static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir,
- *git_graft_file;
-static void setup_git_env(void)
-{
- git_dir = gitenv(GIT_DIR_ENVIRONMENT);
- if (!git_dir)
- git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
- git_object_dir = gitenv(DB_ENVIRONMENT);
- if (!git_object_dir) {
- git_object_dir = xmalloc(strlen(git_dir) + 9);
- sprintf(git_object_dir, "%s/objects", git_dir);
- }
- git_refs_dir = xmalloc(strlen(git_dir) + 6);
- sprintf(git_refs_dir, "%s/refs", git_dir);
- git_index_file = gitenv(INDEX_ENVIRONMENT);
- if (!git_index_file) {
- git_index_file = xmalloc(strlen(git_dir) + 7);
- sprintf(git_index_file, "%s/index", git_dir);
- }
- git_graft_file = gitenv(GRAFT_ENVIRONMENT);
- if (!git_graft_file)
- git_graft_file = strdup(git_path("info/grafts"));
-}
-
-char *get_object_directory(void)
-{
- if (!git_object_dir)
- setup_git_env();
- return git_object_dir;
-}
-
-char *get_refs_directory(void)
+int adjust_shared_perm(const char *path)
{
- if (!git_refs_dir)
- setup_git_env();
- return git_refs_dir;
-}
-
-char *get_index_file(void)
-{
- if (!git_index_file)
- setup_git_env();
- return git_index_file;
-}
+ struct stat st;
+ int mode;
-char *get_graft_file(void)
-{
- if (!git_graft_file)
- setup_git_env();
- return git_graft_file;
+ 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 (mkdir(path, 0777) < 0)
- if (errno != EEXIST) {
+ if (!stat(path, &st)) {
+ /* path exists */
+ if (!S_ISDIR(st.st_mode)) {
*pos = '/';
- return -1;
+ return -3;
}
+ }
+ else if (mkdir(path, 0777)) {
+ *pos = '/';
+ return -1;
+ }
+ else if (adjust_shared_perm(path)) {
+ *pos = '/';
+ return -2;
+ }
*pos++ = '/';
}
return 0;
*buf++ = hex[val >> 4];
*buf++ = hex[val & 0xf];
}
+ *buf = '\0';
+
return buffer;
}
* 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 exactly in the same format as that environment
- * variable. Its base points at a statically allocated buffer that
+ * 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)
+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;
- do {
- for (cp = last; cp < ep && *cp != ':'; cp++)
+ 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);
- *alt_odb_tail = ent;
- alt_odb_tail = &(ent->next);
- ent->next = NULL;
- memcpy(ent->base, last, pfxlen);
+ 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] = ent->base[pfxlen + 3] = '/';
- ent->base[entlen-1] = 0;
+ 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 == ':')
+ while (cp < ep && *cp == sep)
cp++;
last = cp;
- } while (cp < ep);
+ }
}
void prepare_alt_odb(void)
{
char path[PATH_MAX];
- char *map, *ep;
+ char *map;
int fd;
struct stat st;
- char *alt = gitenv(ALTERNATE_DB_ENVIRONMENT) ? : "";
+ char *alt;
+
+ alt = getenv(ALTERNATE_DB_ENVIRONMENT);
+ if (!alt) alt = "";
- sprintf(path, "%s/info/alternates", get_object_directory());
if (alt_odb_tail)
return;
alt_odb_tail = &alt_odb_list;
- link_alt_odb_entries(alt, alt + strlen(alt));
+ 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 (map == MAP_FAILED)
return;
- /* Remove the trailing newline */
- for (ep = map + st.st_size - 1; map < ep && ep[-1] == '\n'; ep--)
- ;
- link_alt_odb_entries(map, ep);
+ link_alt_odb_entries(map, map + st.st_size, '\n',
+ get_object_directory());
munmap(map, st.st_size);
}
return 0;
}
-struct packed_git *add_packed_git(char *path, int path_len)
+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;
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 = sha1_pack_index_name(sha1);
+ char *path;
- if (check_packed_git_idx(path, &idx_size, &idx_map))
+ if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
return NULL;
path = sha1_pack_name(sha1);
packed_git = pack;
}
-static void prepare_packed_git_one(char *objdir)
+static void prepare_packed_git_one(char *objdir, int local)
{
char path[PATH_MAX];
int len;
sprintf(path, "%s/pack", objdir);
len = strlen(path);
dir = opendir(path);
- if (!dir)
+ 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);
/* we have .idx. Is it a file we can map? */
strcpy(path + len, de->d_name);
- p = add_packed_git(path, len + namelen);
+ p = add_packed_git(path, len + namelen, local);
if (!p)
continue;
p->next = packed_git;
if (run_once)
return;
- prepare_packed_git_one(get_object_directory());
+ prepare_packed_git_one(get_object_directory(), 1);
prepare_alt_odb();
for (alt = alt_odb_list; alt; alt = alt->next) {
- alt->name[0] = 0;
- prepare_packed_git_one(alt->base);
+ alt->name[-1] = 0;
+ prepare_packed_git_one(alt->base, 0);
+ alt->name[-1] = '/';
}
run_once = 1;
}
* the result size.
*/
data = delta_head;
- get_delta_hdr_size(&data); /* ignore base size */
+
+ /* ignore base size */
+ get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
/* Read the result size */
- result_size = get_delta_hdr_size(&data);
+ result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
*sizep = result_size;
}
return 0;
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,
strcpy(type, "tag");
break;
default:
- die("corrupted pack file");
+ die("corrupted pack file %s containing object of kind %d",
+ p->pack_name, kind);
}
*store_size = 0; /* notyet */
}
strcpy(type, "tag");
break;
default:
- die("corrupted pack file");
+ die("corrupted pack file %s containing object of kind %d",
+ p->pack_name, kind);
}
if (sizep)
*sizep = size;
retval = unpack_entry_gently(entry, type, sizep);
unuse_packed_git(p);
if (!retval)
- die("corrupted pack file");
+ die("corrupted pack file %s", p->pack_name);
return retval;
}
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;
char *filename;
static char tmpfile[PATH_MAX];
unsigned char hdr[50];
- int fd, hdrlen, ret;
+ int fd, hdrlen;
/* Normally if we have it in the pack then we do not bother writing
* it out into .git/objects/??/?{38} file.
}
if (errno != ENOENT) {
- fprintf(stderr, "sha1 file %s: %s", filename, strerror(errno));
+ fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno));
return -1;
}
fd = mkstemp(tmpfile);
if (fd < 0) {
- fprintf(stderr, "unable to create temporary sha1 filename %s: %s", tmpfile, strerror(errno));
+ fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
return -1;
}
close(fd);
free(compressed);
- ret = link(tmpfile, filename);
- if (ret < 0) {
- ret = errno;
-
- /*
- * 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.
- *
- * When this succeeds, we just return 0. We have nothing
- * left to unlink.
- */
- if (ret == EXDEV && !rename(tmpfile, filename))
- return 0;
- }
- unlink(tmpfile);
- if (ret) {
- if (ret != EEXIST) {
- fprintf(stderr, "unable to write sha1 filename %s: %s", filename, strerror(ret));
- return -1;
- }
- /* FIXME!!! Collision check here ? */
- }
-
- return 0;
+ return move_temp_to_file(tmpfile, filename);
}
int write_sha1_to_fd(int fd, const unsigned char *sha1)
size = write(fd, buf + posn, objsize - posn);
if (size <= 0) {
if (!size) {
- fprintf(stderr, "write closed");
+ fprintf(stderr, "write closed\n");
} else {
perror("write ");
}
int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
size_t bufsize, size_t *bufposn)
{
- char *filename = sha1_file_name(sha1);
-
+ char tmpfile[PATH_MAX];
int local;
z_stream stream;
unsigned char real_sha1[20];
int ret;
SHA_CTX c;
- local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
+ snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
+ local = mkstemp(tmpfile);
if (local < 0)
- return error("Couldn't open %s\n", filename);
+ return error("Couldn't open %s for %s",
+ tmpfile, sha1_to_hex(sha1));
memset(&stream, 0, sizeof(stream));
size = read(fd, buffer + *bufposn, bufsize - *bufposn);
if (size <= 0) {
close(local);
- unlink(filename);
+ unlink(tmpfile);
if (!size)
return error("Connection closed?");
perror("Reading from connection");
close(local);
SHA1_Final(real_sha1, &c);
if (ret != Z_STREAM_END) {
- unlink(filename);
+ unlink(tmpfile);
return error("File %s corrupted", sha1_to_hex(sha1));
}
if (memcmp(sha1, real_sha1, 20)) {
- unlink(filename);
- return error("File %s has bad hash\n", sha1_to_hex(sha1));
+ unlink(tmpfile);
+ return error("File %s has bad hash", sha1_to_hex(sha1));
}
-
- return 0;
+
+ return move_temp_to_file(tmpfile, sha1_file_name(sha1));
}
int has_pack_index(const unsigned char *sha1)
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";
+ 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;
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",
+ sha1, hdr, &hdrlen);
+ } else if (write_sha1_file(target, st->st_size, "blob", sha1))
+ return error("%s: failed to insert into database",
+ path);
+ free(target);
+ break;
+ default:
+ return error("%s: unsupported file type", path);
+ }
+ return 0;
+}