Make "convert-cache" able to handle the really old archive formats

This includes the old-style "flat tree" object, and the old broken
date format. Well, enough of the date format to convert the sparse
archive, at least.
This commit is contained in:
Linus Torvalds 2005-04-23 16:37:31 -07:00
parent 144bde78e9
commit bfac5d9429

View File

@ -1,3 +1,6 @@
#define _XOPEN_SOURCE /* glibc2 needs this */
#include <time.h>
#include <ctype.h>
#include "cache.h"
struct entry {
@ -46,11 +49,6 @@ static struct entry *lookup_entry(unsigned char *sha1)
return insert_new(sha1, low);
}
static void convert_blob(void *buffer, unsigned long size)
{
/* Nothing to do */
}
static void convert_binary_sha1(void *buffer)
{
struct entry *entry = convert_entry(buffer);
@ -68,8 +66,80 @@ static void convert_ascii_sha1(void *buffer)
memcpy(buffer, sha1_to_hex(entry->new_sha1), 40);
}
static void convert_tree(void *buffer, unsigned long size)
#define ORIG_OFFSET (40)
static int prepend_integer(char *buffer, unsigned val, int i)
{
buffer[--i] = '\0';
do {
buffer[--i] = '0' + (val % 10);
val /= 10;
} while (val);
return i;
}
static int write_subdirectory(void *buffer, unsigned long size, const char *base, int baselen, unsigned char *result_sha1)
{
char *new = malloc(size + ORIG_OFFSET);
unsigned long newlen = ORIG_OFFSET;
unsigned long used;
int i;
used = 0;
while (size) {
int len = 21 + strlen(buffer);
char *path = strchr(buffer, ' ');
unsigned char *sha1;
unsigned int mode;
char *slash, *origpath;
if (!path || sscanf(buffer, "%o", &mode) != 1)
die("bad tree conversion");
path++;
if (memcmp(path, base, baselen))
break;
origpath = path;
path += baselen;
slash = strchr(path, '/');
if (!slash) {
newlen += sprintf(new + newlen, "%o %s", mode, path);
new[newlen++] = '\0';
memcpy(new + newlen, buffer + len - 20, 20);
newlen += 20;
used += len;
size -= len;
buffer += len;
continue;
}
newlen += sprintf(new + newlen, "%o %.*s", S_IFDIR, slash - path, path);
new[newlen++] = 0;
sha1 = (unsigned char *)(new + newlen);
newlen += 20;
len = write_subdirectory(buffer, size, origpath, slash-origpath+1, sha1);
used += len;
size -= len;
buffer += len;
}
i = prepend_integer(new, newlen - ORIG_OFFSET, ORIG_OFFSET);
i -= 5;
memcpy(new + i, "tree ", 5);
write_sha1_file(new + i, newlen - i, result_sha1);
free(new);
return used;
}
static void convert_tree(void *buffer, unsigned long size, unsigned char *result_sha1)
{
void *orig_buffer = buffer;
unsigned long orig_size = size;
while (size) {
int len = 1+strlen(buffer);
@ -81,16 +151,140 @@ static void convert_tree(void *buffer, unsigned long size)
size -= len;
buffer += len;
}
write_subdirectory(orig_buffer, orig_size, "", 0, result_sha1);
}
static void convert_commit(void *buffer, unsigned long size)
static unsigned long parse_oldstyle_date(const char *buf)
{
char c, *p;
char buffer[100];
struct tm tm;
const char *formats[] = {
"%c",
"%a %b %d %T",
"%Z",
"%Y",
" %Y",
NULL
};
/* We only ever did two timezones in the bad old format .. */
const char *timezones[] = {
"PDT", "PST", NULL
};
const char **fmt = formats;
p = buffer;
while (isspace(c = *buf))
buf++;
while ((c = *buf++) != '\n')
*p++ = c;
*p++ = 0;
buf = buffer;
memset(&tm, 0, sizeof(tm));
do {
const char *next = strptime(buf, *fmt, &tm);
if (next) {
if (!*next)
return mktime(&tm);
buf = next;
} else {
const char **p = timezones;
while (isspace(*buf))
buf++;
while (*p) {
if (!memcmp(buf, *p, strlen(*p))) {
buf += strlen(*p);
break;
}
p++;
}
}
fmt++;
} while (*buf && *fmt);
printf("left: %s\n", buf);
return mktime(&tm);
}
static int convert_date_line(char *dst, void **buf, unsigned long *sp)
{
unsigned long size = *sp;
char *line = *buf;
char *next = strchr(line, '\n');
char *date = strchr(line, '>');
int len;
if (!next || !date)
die("missing or bad author/committer line %s", line);
next++; date += 2;
*buf = next;
*sp = size - (next - line);
len = date - line;
memcpy(dst, line, len);
dst += len;
/* Is it already in new format? */
if (isdigit(*date)) {
int datelen = next - date;
memcpy(dst, date, datelen);
printf("new format date '%.*s'?\n", datelen-1, date);
return len + datelen;
}
return len + sprintf(dst, "%lu -0700\n", parse_oldstyle_date(date));
}
static void convert_date(void *buffer, unsigned long size, unsigned char *result_sha1)
{
char *new = malloc(size + ORIG_OFFSET + 100);
unsigned long newlen = ORIG_OFFSET;
int i;
// "tree <sha1>\n"
memcpy(new + newlen, buffer, 46);
newlen += 46;
buffer += 46;
size -= 46;
// "parent <sha1>\n"
while (!memcmp(buffer, "parent ", 7)) {
memcpy(new + newlen, buffer, 48);
newlen += 48;
buffer += 48;
size -= 48;
}
// "author xyz <xyz> date"
newlen += convert_date_line(new + newlen, &buffer, &size);
// "committer xyz <xyz> date"
newlen += convert_date_line(new + newlen, &buffer, &size);
// Rest
memcpy(new + newlen, buffer, size);
newlen += size;
i = prepend_integer(new, newlen - ORIG_OFFSET, ORIG_OFFSET);
i -= 7;
memcpy(new + i, "commit ", 7);
write_sha1_file(new + i, newlen - i, result_sha1);
free(new);
}
static void convert_commit(void *buffer, unsigned long size, unsigned char *result_sha1)
{
void *orig_buffer = buffer;
unsigned long orig_size = size;
convert_ascii_sha1(buffer+5);
buffer += 46; /* "tree " + "hex sha1" + "\n" */
while (!memcmp(buffer, "parent ", 7)) {
convert_ascii_sha1(buffer+7);
buffer += 48;
}
convert_date(orig_buffer, orig_size, result_sha1);
}
static struct entry * convert_entry(unsigned char *sha1)
@ -110,15 +304,14 @@ static struct entry * convert_entry(unsigned char *sha1)
offset = sprintf(buffer, "%s %lu", type, size)+1;
memcpy(buffer + offset, data, size);
if (!strcmp(type, "blob"))
convert_blob(buffer + offset, size);
else if (!strcmp(type, "tree"))
convert_tree(buffer + offset, size);
if (!strcmp(type, "blob")) {
write_sha1_file(buffer, size + offset, entry->new_sha1);
} else if (!strcmp(type, "tree"))
convert_tree(buffer + offset, size, entry->new_sha1);
else if (!strcmp(type, "commit"))
convert_commit(buffer + offset, size);
convert_commit(buffer + offset, size, entry->new_sha1);
else
die("unknown object type '%s' in %s", type, sha1_to_hex(sha1));
write_sha1_file(buffer, size + offset, entry->new_sha1);
entry->converted = 1;
free(buffer);
return entry;