#include "tree.h"
#include "refs.h"
#include "pack-revindex.h"
+#include "sha1-lookup.h"
#ifndef O_NOATIME
#if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
return base;
}
-char *sha1_pack_name(const unsigned char *sha1)
+static char *sha1_get_pack_name(const unsigned char *sha1,
+ char **name, char **base, const char *which)
{
static const char hex[] = "0123456789abcdef";
- static char *name, *base, *buf;
+ char *buf;
int i;
- if (!base) {
+ 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;
+ *base = xmalloc(len + 60);
+ sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s",
+ sha1_file_directory, which);
+ *name = *base + len + 11;
}
- buf = name;
+ buf = *name;
for (i = 0; i < 20; i++) {
unsigned int val = *sha1++;
*buf++ = hex[val & 0xf];
}
- return base;
+ return *base;
}
-char *sha1_pack_index_name(const unsigned char *sha1)
+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.idx", sha1_file_directory);
- name = base + len + 11;
- }
+ static char *name, *base;
- buf = name;
+ return sha1_get_pack_name(sha1, &name, &base, "pack");
+}
- for (i = 0; i < 20; i++) {
- unsigned int val = *sha1++;
- *buf++ = hex[val >> 4];
- *buf++ = hex[val & 0xf];
- }
+char *sha1_pack_index_name(const unsigned char *sha1)
+{
+ static char *name, *base;
- return base;
+ return sha1_get_pack_name(sha1, &name, &base, "idx");
}
struct alternate_object_database *alt_odb_list;
munmap(map, mapsz);
}
+void add_to_alternates_file(const char *reference)
+{
+ struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
+ int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), 1);
+ char *alt = mkpath("%s/objects\n", reference);
+ write_or_die(fd, alt, strlen(alt));
+ if (commit_lock_file(lock))
+ die("could not close alternates file");
+ if (alt_odb_tail)
+ link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0);
+}
+
void prepare_alt_odb(void)
{
const char *alt;
{
const uint32_t *level1_ofs = p->index_data;
const unsigned char *index = p->index_data;
- unsigned hi, lo;
+ unsigned hi, lo, stride;
+ static int use_lookup = -1;
+ static int debug_lookup = -1;
+
+ if (debug_lookup < 0)
+ debug_lookup = !!getenv("GIT_DEBUG_LOOKUP");
if (!index) {
if (open_pack_index(p))
index += 4 * 256;
hi = ntohl(level1_ofs[*sha1]);
lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
+ if (p->index_version > 1) {
+ stride = 20;
+ } else {
+ stride = 24;
+ index += 4;
+ }
+
+ if (debug_lookup)
+ printf("%02x%02x%02x... lo %u hi %u nr %u\n",
+ sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects);
+
+ if (use_lookup < 0)
+ use_lookup = !!getenv("GIT_USE_LOOKUP");
+ if (use_lookup) {
+ int pos = sha1_entry_pos(index, stride, 0,
+ lo, hi, p->num_objects, sha1);
+ if (pos < 0)
+ return 0;
+ return nth_packed_object_offset(p, pos);
+ }
do {
unsigned mi = (lo + hi) / 2;
- unsigned x = (p->index_version > 1) ? (mi * 20) : (mi * 24 + 4);
- int cmp = hashcmp(index + x, sha1);
+ int cmp = hashcmp(index + mi * stride, sha1);
+
+ if (debug_lookup)
+ printf("lo %u hi %u rg %u mi %u\n",
+ lo, hi, hi - lo, mi);
if (!cmp)
return nth_packed_object_offset(p, mi);
if (cmp > 0)
return 0;
}
-int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
+static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
+ void *buf, unsigned long len, time_t mtime)
{
- int size, ret;
+ int fd, size, ret;
unsigned char *compressed;
z_stream stream;
- unsigned char sha1[20];
char *filename;
static char tmpfile[PATH_MAX];
- char hdr[32];
- int fd, hdrlen;
- /* Normally if we have it in the pack then we do not bother writing
- * it out into .git/objects/??/?{38} file.
- */
- write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
filename = sha1_file_name(sha1);
- if (returnsha1)
- hashcpy(returnsha1, sha1);
- if (has_sha1_file(sha1))
- return 0;
fd = open(filename, O_RDONLY);
if (fd >= 0) {
/*
die("unable to write sha1 file");
free(compressed);
+ if (mtime) {
+ struct utimbuf utb;
+ utb.actime = mtime;
+ utb.modtime = mtime;
+ if (utime(tmpfile, &utb) < 0)
+ warning("failed utime() on %s: %s",
+ tmpfile, strerror(errno));
+ }
+
return move_temp_to_file(tmpfile, filename);
}
+int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
+{
+ unsigned char sha1[20];
+ char hdr[32];
+ int hdrlen;
+
+ /* Normally if we have it in the pack then we do not bother writing
+ * it out into .git/objects/??/?{38} file.
+ */
+ write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
+ if (returnsha1)
+ hashcpy(returnsha1, sha1);
+ if (has_sha1_file(sha1))
+ return 0;
+ return write_loose_object(sha1, hdr, hdrlen, buf, len, 0);
+}
+
+int force_object_loose(const unsigned char *sha1, time_t mtime)
+{
+ struct stat st;
+ void *buf;
+ unsigned long len;
+ enum object_type type;
+ char hdr[32];
+ int hdrlen;
+
+ if (find_sha1_file(sha1, &st))
+ return 0;
+ buf = read_packed_sha1(sha1, &type, &len);
+ if (!buf)
+ return error("cannot read sha1_file for %s", sha1_to_hex(sha1));
+ hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
+ return write_loose_object(sha1, hdr, hdrlen, buf, len, mtime);
+}
+
/*
* We need to unpack and recompress the object for writing
* it out to a different file.
int read_pack_header(int fd, struct pack_header *header)
{
- char *c = (char*)header;
- ssize_t remaining = sizeof(struct pack_header);
- do {
- ssize_t r = xread(fd, c, remaining);
- if (r <= 0)
- /* "eof before pack header was fully read" */
- return PH_ERROR_EOF;
- remaining -= r;
- c += r;
- } while (remaining > 0);
+ if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header))
+ /* "eof before pack header was fully read" */
+ return PH_ERROR_EOF;
+
if (header->hdr_signature != htonl(PACK_SIGNATURE))
/* "protocol error (pack signature mismatch detected)" */
return PH_ERROR_PACK_SIGNATURE;