update-cache.con commit Fix diff-tree recursion. (262e82b)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7
   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
  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) {
  69                if (errno == ENOENT) {
  70                        if (allow_remove)
  71                                return remove_file_from_cache(path);
  72                }
  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
  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]);
 122}
 123
 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;
 155        int allow_options = 1;
 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];
 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                }
 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");
 203        return 0;
 204}