2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
8 static int check_valid_sha1(unsigned char *sha1)
10 char *filename = sha1_file_name(sha1);
13 /* If we were anal, we'd check that the sha1 of the contents actually matches */
14 ret = access(filename, R_OK);
20 static int prepend_integer(char *buffer, unsigned val, int i)
24 buffer[--i] = '0' + (val % 10);
30 #define ORIG_OFFSET (40) /* Enough space to add the header of "tree <size>\0" */
32 static int write_tree(struct cache_entry **cachep, int maxentries, const char *base, int baselen, unsigned char *returnsha1)
34 unsigned char subdir_sha1[20];
35 unsigned long size, offset;
39 /* Guess at some random initial size */
41 buffer = malloc(size);
46 struct cache_entry *ce = cachep[nr];
47 const char *pathname = ce->name, *filename, *dirname;
48 int pathlen = ce->namelen, entrylen;
52 /* Did we hit the end of the directory? Return how many we wrote */
53 if (baselen >= pathlen || memcmp(base, pathname, baselen))
59 /* Do we have _further_ subdirectories? */
60 filename = pathname + baselen;
61 dirname = strchr(filename, '/');
65 subdir_written = write_tree(cachep + nr, maxentries - nr, pathname, dirname-pathname+1, subdir_sha1);
66 fprintf(stderr, "Wrote %d entries from subdirectory '%.*s'\n",
67 subdir_written, dirname-pathname, pathname);
70 /* Now we need to write out the directory entry into this tree.. */
72 pathlen = dirname - pathname;
74 /* ..but the directory entry doesn't count towards the total count */
79 if (check_valid_sha1(sha1) < 0)
82 entrylen = pathlen - baselen;
83 if (offset + entrylen + 100 > size) {
84 size = alloc_nr(offset + entrylen + 100);
85 buffer = realloc(buffer, size);
87 offset += sprintf(buffer + offset, "%o %.*s", mode, entrylen, filename);
89 memcpy(buffer + offset, sha1, 20);
92 } while (nr < maxentries);
94 i = prepend_integer(buffer, offset - ORIG_OFFSET, ORIG_OFFSET);
96 memcpy(buffer+i, "tree ", 5);
101 write_sha1_file(buffer, offset, returnsha1);
105 int main(int argc, char **argv)
107 int entries = read_cache();
108 unsigned char sha1[20];
111 usage("no cache contents to write");
112 if (write_tree(active_cache, entries, "", 0, sha1) != entries)
113 usage("write-tree: internal error");
114 printf("%s\n", sha1_to_hex(sha1));