From: Linus Torvalds Date: Sat, 23 Apr 2005 23:37:31 +0000 (-0700) Subject: Make "convert-cache" able to handle the really old archive formats X-Git-Tag: v0.99~773 X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=bfac5d94291bdb951ae3e739598a32bf868ea806;p=git.git 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. --- diff --git a/convert-cache.c b/convert-cache.c index 97e995251..35191dffa 100644 --- a/convert-cache.c +++ b/convert-cache.c @@ -1,3 +1,6 @@ +#define _XOPEN_SOURCE /* glibc2 needs this */ +#include +#include #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 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_commit(void *buffer, unsigned long size) +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 \n" + memcpy(new + newlen, buffer, 46); + newlen += 46; + buffer += 46; + size -= 46; + + // "parent \n" + while (!memcmp(buffer, "parent ", 7)) { + memcpy(new + newlen, buffer, 48); + newlen += 48; + buffer += 48; + size -= 48; + } + + // "author xyz date" + newlen += convert_date_line(new + newlen, &buffer, &size); + // "committer 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;