Fix up commit-tree/diff-tree user interface issues.
[git/git.git] / update-cache.c
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8bc9a0c7
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1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
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6#include "cache.h"
7
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8/*
9 * Default to not allowing changes to the list of files. The
10 * tool doesn't actually care, but this makes it harder to add
11 * files to the revision control by mistake by doing something
12 * like "update-cache *" and suddenly having all the object
13 * files be revision controlled.
14 */
15static int allow_add = 0, allow_remove = 0;
16
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17static int index_fd(const char *path, int namelen, struct cache_entry *ce, int fd, struct stat *st)
18{
19 z_stream stream;
20 int max_out_bytes = namelen + st->st_size + 200;
21 void *out = malloc(max_out_bytes);
22 void *metadata = malloc(namelen + 200);
23 void *in = mmap(NULL, st->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
24 SHA_CTX c;
25
26 close(fd);
27 if (!out || (int)(long)in == -1)
28 return -1;
29
30 memset(&stream, 0, sizeof(stream));
31 deflateInit(&stream, Z_BEST_COMPRESSION);
32
33 /*
34 * ASCII size + nul byte
35 */
36 stream.next_in = metadata;
37 stream.avail_in = 1+sprintf(metadata, "blob %lu", (unsigned long) st->st_size);
38 stream.next_out = out;
39 stream.avail_out = max_out_bytes;
40 while (deflate(&stream, 0) == Z_OK)
41 /* nothing */;
42
43 /*
44 * File content
45 */
46 stream.next_in = in;
47 stream.avail_in = st->st_size;
48 while (deflate(&stream, Z_FINISH) == Z_OK)
49 /*nothing */;
50
51 deflateEnd(&stream);
52
53 SHA1_Init(&c);
54 SHA1_Update(&c, out, stream.total_out);
55 SHA1_Final(ce->sha1, &c);
56
57 return write_sha1_buffer(ce->sha1, out, stream.total_out);
58}
59
60static int add_file_to_cache(char *path)
61{
62 int size, namelen;
63 struct cache_entry *ce;
64 struct stat st;
65 int fd;
66
67 fd = open(path, O_RDONLY);
68 if (fd < 0) {
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69 if (errno == ENOENT) {
70 if (allow_remove)
71 return remove_file_from_cache(path);
72 }
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73 return -1;
74 }
75 if (fstat(fd, &st) < 0) {
76 close(fd);
77 return -1;
78 }
79 namelen = strlen(path);
80 size = cache_entry_size(namelen);
81 ce = malloc(size);
82 memset(ce, 0, size);
83 memcpy(ce->name, path, namelen);
84 ce->ctime.sec = st.st_ctime;
85 ce->ctime.nsec = st.st_ctim.tv_nsec;
86 ce->mtime.sec = st.st_mtime;
87 ce->mtime.nsec = st.st_mtim.tv_nsec;
88 ce->st_dev = st.st_dev;
89 ce->st_ino = st.st_ino;
90 ce->st_mode = st.st_mode;
91 ce->st_uid = st.st_uid;
92 ce->st_gid = st.st_gid;
93 ce->st_size = st.st_size;
94 ce->namelen = namelen;
95
96 if (index_fd(path, namelen, ce, fd, &st) < 0)
97 return -1;
98
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99 return add_cache_entry(ce, allow_add);
100}
101
102static void refresh_entry(struct cache_entry *ce)
103{
104 /*
105 * This is really not the right way to do it, but
106 * add_file_to_cache() does do the right thing.
107 *
108 * We should really just update the cache
109 * entry in-place, I think. With this approach we
110 * end up allocating a new one, searching for where
111 * to insert it etc etc crud.
112 */
113 add_file_to_cache(ce->name);
114}
115
116static void refresh_cache(void)
117{
118 int i;
119
120 for (i = 0; i < active_nr; i++)
121 refresh_entry(active_cache[i]);
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122}
123
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124/*
125 * We fundamentally don't like some paths: we don't want
126 * dot or dot-dot anywhere, and in fact, we don't even want
127 * any other dot-files (.dircache or anything else). They
128 * are hidden, for chist sake.
129 *
130 * Also, we don't want double slashes or slashes at the
131 * end that can make pathnames ambiguous.
132 */
133static int verify_path(char *path)
134{
135 char c;
136
137 goto inside;
138 for (;;) {
139 if (!c)
140 return 1;
141 if (c == '/') {
142inside:
143 c = *path++;
144 if (c != '/' && c != '.' && c != '\0')
145 continue;
146 return 0;
147 }
148 c = *path++;
149 }
150}
151
152int main(int argc, char **argv)
153{
154 int i, newfd, entries;
121481ab 155 int allow_options = 1;
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156
157 entries = read_cache();
158 if (entries < 0) {
159 perror("cache corrupted");
160 return -1;
161 }
162
163 newfd = open(".dircache/index.lock", O_RDWR | O_CREAT | O_EXCL, 0600);
164 if (newfd < 0) {
165 perror("unable to create new cachefile");
166 return -1;
167 }
168 for (i = 1 ; i < argc; i++) {
169 char *path = argv[i];
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170
171 if (allow_options && *path == '-') {
172 if (!strcmp(path, "--")) {
173 allow_options = 0;
174 continue;
175 }
176 if (!strcmp(path, "--add")) {
177 allow_add = 1;
178 continue;
179 }
180 if (!strcmp(path, "--remove")) {
181 allow_remove = 1;
182 continue;
183 }
184 if (!strcmp(path, "--refresh")) {
185 refresh_cache();
186 continue;
187 }
188 usage("unknown option %s", path);
189 }
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190 if (!verify_path(path)) {
191 fprintf(stderr, "Ignoring path %s\n", argv[i]);
192 continue;
193 }
194 if (add_file_to_cache(path)) {
195 fprintf(stderr, "Unable to add %s to database\n", path);
196 goto out;
197 }
198 }
199 if (!write_cache(newfd, active_cache, active_nr) && !rename(".dircache/index.lock", ".dircache/index"))
200 return 0;
201out:
202 unlink(".dircache/index.lock");
19b2860c 203 return 0;
e83c5163 204}