1 #define _XOPEN_SOURCE /* glibc2 needs this */
7 unsigned char old_sha1[20];
8 unsigned char new_sha1[20];
12 #define MAXOBJECTS (1000000)
14 static struct entry *convert[MAXOBJECTS];
15 static int nr_convert;
17 static struct entry * convert_entry(unsigned char *sha1);
19 static struct entry *insert_new(unsigned char *sha1, int pos)
21 struct entry *new = xmalloc(sizeof(struct entry));
22 memset(new, 0, sizeof(*new));
23 memcpy(new->old_sha1, sha1, 20);
24 memmove(convert + pos + 1, convert + pos, (nr_convert - pos) * sizeof(struct entry *));
27 if (nr_convert == MAXOBJECTS)
28 die("you're kidding me - hit maximum object limit");
32 static struct entry *lookup_entry(unsigned char *sha1)
34 int low = 0, high = nr_convert;
37 int next = (low + high) / 2;
38 struct entry *n = convert[next];
39 int cmp = memcmp(sha1, n->old_sha1, 20);
48 return insert_new(sha1, low);
51 static void convert_binary_sha1(void *buffer)
53 struct entry *entry = convert_entry(buffer);
54 memcpy(buffer, entry->new_sha1, 20);
57 static void convert_ascii_sha1(void *buffer)
59 unsigned char sha1[20];
62 if (get_sha1_hex(buffer, sha1))
63 die("expected sha1, got '%s'", (char*) buffer);
64 entry = convert_entry(sha1);
65 memcpy(buffer, sha1_to_hex(entry->new_sha1), 40);
68 static unsigned int convert_mode(unsigned int mode)
72 newmode = mode & S_IFMT;
74 newmode |= (mode & 0100) ? 0755 : 0644;
78 static int write_subdirectory(void *buffer, unsigned long size, const char *base, int baselen, unsigned char *result_sha1)
80 char *new = xmalloc(size);
81 unsigned long newlen = 0;
86 int len = 21 + strlen(buffer);
87 char *path = strchr(buffer, ' ');
90 char *slash, *origpath;
92 if (!path || sscanf(buffer, "%o", &mode) != 1)
93 die("bad tree conversion");
94 mode = convert_mode(mode);
96 if (memcmp(path, base, baselen))
100 slash = strchr(path, '/');
102 newlen += sprintf(new + newlen, "%o %s", mode, path);
103 new[newlen++] = '\0';
104 memcpy(new + newlen, buffer + len - 20, 20);
113 newlen += sprintf(new + newlen, "%o %.*s", S_IFDIR, (int)(slash - path), path);
115 sha1 = (unsigned char *)(new + newlen);
118 len = write_subdirectory(buffer, size, origpath, slash-origpath+1, sha1);
125 write_sha1_file(new, newlen, "tree", result_sha1);
130 static void convert_tree(void *buffer, unsigned long size, unsigned char *result_sha1)
132 void *orig_buffer = buffer;
133 unsigned long orig_size = size;
136 int len = 1+strlen(buffer);
138 convert_binary_sha1(buffer + len);
142 die("corrupt tree object");
147 write_subdirectory(orig_buffer, orig_size, "", 0, result_sha1);
150 static unsigned long parse_oldstyle_date(const char *buf)
155 const char *formats[] = {
163 /* We only ever did two timezones in the bad old format .. */
164 const char *timezones[] = {
165 "PDT", "PST", "CEST", NULL
167 const char **fmt = formats;
170 while (isspace(c = *buf))
172 while ((c = *buf++) != '\n')
176 memset(&tm, 0, sizeof(tm));
178 const char *next = strptime(buf, *fmt, &tm);
184 const char **p = timezones;
185 while (isspace(*buf))
188 if (!memcmp(buf, *p, strlen(*p))) {
196 } while (*buf && *fmt);
197 printf("left: %s\n", buf);
201 static int convert_date_line(char *dst, void **buf, unsigned long *sp)
203 unsigned long size = *sp;
205 char *next = strchr(line, '\n');
206 char *date = strchr(line, '>');
210 die("missing or bad author/committer line %s", line);
214 *sp = size - (next - line);
217 memcpy(dst, line, len);
220 /* Is it already in new format? */
221 if (isdigit(*date)) {
222 int datelen = next - date;
223 memcpy(dst, date, datelen);
224 return len + datelen;
228 * Hacky hacky: one of the sparse old-style commits does not have
229 * any date at all, but we can fake it by using the committer date.
231 if (*date == '\n' && strchr(next, '>'))
232 date = strchr(next, '>')+2;
234 return len + sprintf(dst, "%lu -0700\n", parse_oldstyle_date(date));
237 static void convert_date(void *buffer, unsigned long size, unsigned char *result_sha1)
239 char *new = xmalloc(size + 100);
240 unsigned long newlen = 0;
243 memcpy(new + newlen, buffer, 46);
249 while (!memcmp(buffer, "parent ", 7)) {
250 memcpy(new + newlen, buffer, 48);
256 // "author xyz <xyz> date"
257 newlen += convert_date_line(new + newlen, &buffer, &size);
258 // "committer xyz <xyz> date"
259 newlen += convert_date_line(new + newlen, &buffer, &size);
262 memcpy(new + newlen, buffer, size);
265 write_sha1_file(new, newlen, "commit", result_sha1);
269 static void convert_commit(void *buffer, unsigned long size, unsigned char *result_sha1)
271 void *orig_buffer = buffer;
272 unsigned long orig_size = size;
274 if (memcmp(buffer, "tree ", 5))
275 die("Bad commit '%s'", (char*) buffer);
276 convert_ascii_sha1(buffer+5);
277 buffer += 46; /* "tree " + "hex sha1" + "\n" */
278 while (!memcmp(buffer, "parent ", 7)) {
279 convert_ascii_sha1(buffer+7);
282 convert_date(orig_buffer, orig_size, result_sha1);
285 static struct entry * convert_entry(unsigned char *sha1)
287 struct entry *entry = lookup_entry(sha1);
292 if (entry->converted)
294 data = read_sha1_file(sha1, type, &size);
296 die("unable to read object %s", sha1_to_hex(sha1));
298 buffer = xmalloc(size);
299 memcpy(buffer, data, size);
301 if (!strcmp(type, "blob")) {
302 write_sha1_file(buffer, size, "blob", entry->new_sha1);
303 } else if (!strcmp(type, "tree"))
304 convert_tree(buffer, size, entry->new_sha1);
305 else if (!strcmp(type, "commit"))
306 convert_commit(buffer, size, entry->new_sha1);
308 die("unknown object type '%s' in %s", type, sha1_to_hex(sha1));
309 entry->converted = 1;
315 int main(int argc, char **argv)
317 unsigned char sha1[20];
320 if (argc != 2 || get_sha1(argv[1], sha1))
321 usage("git-convert-cache <sha1>");
323 entry = convert_entry(sha1);
324 printf("new sha1: %s\n", sha1_to_hex(entry->new_sha1));