[PATCH] Port rev-tree to parsing functions
[alt-git.git] / write-tree.c
blob827809dbddbff6dd8cf842641f6db5ad2f3ae07a
1 /*
2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
5 */
6 #include "cache.h"
8 static int check_valid_sha1(unsigned char *sha1)
10 char *filename = sha1_file_name(sha1);
11 int ret;
13 /* If we were anal, we'd check that the sha1 of the contents actually matches */
14 ret = access(filename, R_OK);
15 if (ret)
16 perror(filename);
17 return ret;
20 static int prepend_integer(char *buffer, unsigned val, int i)
22 buffer[--i] = '\0';
23 do {
24 buffer[--i] = '0' + (val % 10);
25 val /= 10;
26 } while (val);
27 return i;
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;
36 char *buffer;
37 int i, nr;
39 /* Guess at some random initial size */
40 size = 8192;
41 buffer = malloc(size);
42 offset = ORIG_OFFSET;
44 nr = 0;
45 do {
46 struct cache_entry *ce = cachep[nr];
47 const char *pathname = ce->name, *filename, *dirname;
48 int pathlen = ce_namelen(ce), entrylen;
49 unsigned char *sha1;
50 unsigned int mode;
52 /* Did we hit the end of the directory? Return how many we wrote */
53 if (baselen >= pathlen || memcmp(base, pathname, baselen))
54 break;
56 sha1 = ce->sha1;
57 mode = ntohl(ce->ce_mode);
59 /* Do we have _further_ subdirectories? */
60 filename = pathname + baselen;
61 dirname = strchr(filename, '/');
62 if (dirname) {
63 int subdir_written;
65 subdir_written = write_tree(cachep + nr, maxentries - nr, pathname, dirname-pathname+1, subdir_sha1);
66 nr += subdir_written;
68 /* Now we need to write out the directory entry into this tree.. */
69 mode = S_IFDIR;
70 pathlen = dirname - pathname;
72 /* ..but the directory entry doesn't count towards the total count */
73 nr--;
74 sha1 = subdir_sha1;
77 if (check_valid_sha1(sha1) < 0)
78 exit(1);
80 entrylen = pathlen - baselen;
81 if (offset + entrylen + 100 > size) {
82 size = alloc_nr(offset + entrylen + 100);
83 buffer = realloc(buffer, size);
85 offset += sprintf(buffer + offset, "%o %.*s", mode, entrylen, filename);
86 buffer[offset++] = 0;
87 memcpy(buffer + offset, sha1, 20);
88 offset += 20;
89 nr++;
90 } while (nr < maxentries);
92 i = prepend_integer(buffer, offset - ORIG_OFFSET, ORIG_OFFSET);
93 i -= 5;
94 memcpy(buffer+i, "tree ", 5);
96 write_sha1_file(buffer + i, offset - i, returnsha1);
97 free(buffer);
98 return nr;
101 int main(int argc, char **argv)
103 int i, unmerged;
104 int entries = read_cache();
105 unsigned char sha1[20];
107 if (entries <= 0)
108 die("write-tree: no cache contents to write");
110 /* Verify that the tree is merged */
111 unmerged = 0;
112 for (i = 0; i < entries; i++) {
113 struct cache_entry *ce = active_cache[i];
114 if (ntohs(ce->ce_flags) & ~CE_NAMEMASK) {
115 if (++unmerged > 10) {
116 fprintf(stderr, "...\n");
117 break;
119 fprintf(stderr, "%s: unmerged (%s)\n", ce->name, sha1_to_hex(ce->sha1));
122 if (unmerged)
123 die("write-tree: not able to write tree");
125 /* Ok, write it out */
126 if (write_tree(active_cache, entries, "", 0, sha1) != entries)
127 die("write-tree: internal error");
128 printf("%s\n", sha1_to_hex(sha1));
129 return 0;