Andrew's git - gitweb.git/blob

   1/*
   2 * Copyright (C) 2005 Junio C Hamano
   3 */
   4#include "cache.h"
   5#include "commit.h"
   6#include "fetch.h"
   7
   8static int use_link;
   9static int use_symlink;
  10static int use_filecopy = 1;
  11static int commits_on_stdin;
  12
  13static const char *path; /* "Remote" git repository */
  14
  15void prefetch(unsigned char *sha1)
  16{
  17}
  18
  19static struct packed_git *packs;
  20
  21static void setup_index(unsigned char *sha1)
  22{
  23        struct packed_git *new_pack;
  24        char filename[PATH_MAX];
  25        strcpy(filename, path);
  26        strcat(filename, "/objects/pack/pack-");
  27        strcat(filename, sha1_to_hex(sha1));
  28        strcat(filename, ".idx");
  29        new_pack = parse_pack_index_file(sha1, filename);
  30        new_pack->next = packs;
  31        packs = new_pack;
  32}
  33
  34static int setup_indices(void)
  35{
  36        DIR *dir;
  37        struct dirent *de;
  38        char filename[PATH_MAX];
  39        unsigned char sha1[20];
  40        sprintf(filename, "%s/objects/pack/", path);
  41        dir = opendir(filename);
  42        if (!dir)
  43                return -1;
  44        while ((de = readdir(dir)) != NULL) {
  45                int namelen = strlen(de->d_name);
  46                if (namelen != 50 ||
  47                    !has_extension(de->d_name, ".pack"))
  48                        continue;
  49                get_sha1_hex(de->d_name + 5, sha1);
  50                setup_index(sha1);
  51        }
  52        closedir(dir);
  53        return 0;
  54}
  55
  56static int copy_file(const char *source, char *dest, const char *hex,
  57                     int warn_if_not_exists)
  58{
  59        safe_create_leading_directories(dest);
  60        if (use_link) {
  61                if (!link(source, dest)) {
  62                        pull_say("link %s\n", hex);
  63                        return 0;
  64                }
  65                /* If we got ENOENT there is no point continuing. */
  66                if (errno == ENOENT) {
  67                        if (warn_if_not_exists)
  68                                fprintf(stderr, "does not exist %s\n", source);
  69                        return -1;
  70                }
  71        }
  72        if (use_symlink) {
  73                struct stat st;
  74                if (stat(source, &st)) {
  75                        if (!warn_if_not_exists && errno == ENOENT)
  76                                return -1;
  77                        fprintf(stderr, "cannot stat %s: %s\n", source,
  78                                strerror(errno));
  79                        return -1;
  80                }
  81                if (!symlink(source, dest)) {
  82                        pull_say("symlink %s\n", hex);
  83                        return 0;
  84                }
  85        }
  86        if (use_filecopy) {
  87                int ifd, ofd, status = 0;
  88
  89                ifd = open(source, O_RDONLY);
  90                if (ifd < 0) {
  91                        if (!warn_if_not_exists && errno == ENOENT)
  92                                return -1;
  93                        fprintf(stderr, "cannot open %s\n", source);
  94                        return -1;
  95                }
  96                ofd = open(dest, O_WRONLY | O_CREAT | O_EXCL, 0666);
  97                if (ofd < 0) {
  98                        fprintf(stderr, "cannot open %s\n", dest);
  99                        close(ifd);
 100                        return -1;
 101                }
 102                status = copy_fd(ifd, ofd);
 103                close(ofd);
 104                if (status)
 105                        fprintf(stderr, "cannot write %s\n", dest);
 106                else
 107                        pull_say("copy %s\n", hex);
 108                return status;
 109        }
 110        fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
 111        return -1;
 112}
 113
 114static int fetch_pack(const unsigned char *sha1)
 115{
 116        struct packed_git *target;
 117        char filename[PATH_MAX];
 118        if (setup_indices())
 119                return -1;
 120        target = find_sha1_pack(sha1, packs);
 121        if (!target)
 122                return error("Couldn't find %s: not separate or in any pack", 
 123                             sha1_to_hex(sha1));
 124        if (get_verbosely) {
 125                fprintf(stderr, "Getting pack %s\n",
 126                        sha1_to_hex(target->sha1));
 127                fprintf(stderr, " which contains %s\n",
 128                        sha1_to_hex(sha1));
 129        }
 130        sprintf(filename, "%s/objects/pack/pack-%s.pack", 
 131                path, sha1_to_hex(target->sha1));
 132        copy_file(filename, sha1_pack_name(target->sha1),
 133                  sha1_to_hex(target->sha1), 1);
 134        sprintf(filename, "%s/objects/pack/pack-%s.idx", 
 135                path, sha1_to_hex(target->sha1));
 136        copy_file(filename, sha1_pack_index_name(target->sha1),
 137                  sha1_to_hex(target->sha1), 1);
 138        install_packed_git(target);
 139        return 0;
 140}
 141
 142static int fetch_file(const unsigned char *sha1)
 143{
 144        static int object_name_start = -1;
 145        static char filename[PATH_MAX];
 146        char *hex = sha1_to_hex(sha1);
 147        char *dest_filename = sha1_file_name(sha1);
 148
 149        if (object_name_start < 0) {
 150                strcpy(filename, path); /* e.g. git.git */
 151                strcat(filename, "/objects/");
 152                object_name_start = strlen(filename);
 153        }
 154        filename[object_name_start+0] = hex[0];
 155        filename[object_name_start+1] = hex[1];
 156        filename[object_name_start+2] = '/';
 157        strcpy(filename + object_name_start + 3, hex + 2);
 158        return copy_file(filename, dest_filename, hex, 0);
 159}
 160
 161int fetch(unsigned char *sha1)
 162{
 163        if (has_sha1_file(sha1))
 164                return 0;
 165        else
 166                return fetch_file(sha1) && fetch_pack(sha1);
 167}
 168
 169int fetch_ref(char *ref, unsigned char *sha1)
 170{
 171        static int ref_name_start = -1;
 172        static char filename[PATH_MAX];
 173        static char hex[41];
 174        int ifd;
 175
 176        if (ref_name_start < 0) {
 177                sprintf(filename, "%s/refs/", path);
 178                ref_name_start = strlen(filename);
 179        }
 180        strcpy(filename + ref_name_start, ref);
 181        ifd = open(filename, O_RDONLY);
 182        if (ifd < 0) {
 183                close(ifd);
 184                fprintf(stderr, "cannot open %s\n", filename);
 185                return -1;
 186        }
 187        if (read(ifd, hex, 40) != 40 || get_sha1_hex(hex, sha1)) {
 188                close(ifd);
 189                fprintf(stderr, "cannot read from %s\n", filename);
 190                return -1;
 191        }
 192        close(ifd);
 193        pull_say("ref %s\n", sha1_to_hex(sha1));
 194        return 0;
 195}
 196
 197static const char local_pull_usage[] =
 198"git-local-fetch [-c] [-t] [-a] [-v] [-w filename] [--recover] [-l] [-s] [-n] [--stdin] commit-id path";
 199
 200/*
 201 * By default we only use file copy.
 202 * If -l is specified, a hard link is attempted.
 203 * If -s is specified, then a symlink is attempted.
 204 * If -n is _not_ specified, then a regular file-to-file copy is done.
 205 */
 206int main(int argc, const char **argv)
 207{
 208        int commits;
 209        const char **write_ref = NULL;
 210        char **commit_id;
 211        int arg = 1;
 212
 213        setup_ident();
 214        setup_git_directory();
 215        git_config(git_default_config);
 216
 217        while (arg < argc && argv[arg][0] == '-') {
 218                if (argv[arg][1] == 't')
 219                        get_tree = 1;
 220                else if (argv[arg][1] == 'c')
 221                        get_history = 1;
 222                else if (argv[arg][1] == 'a') {
 223                        get_all = 1;
 224                        get_tree = 1;
 225                        get_history = 1;
 226                }
 227                else if (argv[arg][1] == 'l')
 228                        use_link = 1;
 229                else if (argv[arg][1] == 's')
 230                        use_symlink = 1;
 231                else if (argv[arg][1] == 'n')
 232                        use_filecopy = 0;
 233                else if (argv[arg][1] == 'v')
 234                        get_verbosely = 1;
 235                else if (argv[arg][1] == 'w')
 236                        write_ref = &argv[++arg];
 237                else if (!strcmp(argv[arg], "--recover"))
 238                        get_recover = 1;
 239                else if (!strcmp(argv[arg], "--stdin"))
 240                        commits_on_stdin = 1;
 241                else
 242                        usage(local_pull_usage);
 243                arg++;
 244        }
 245        if (argc < arg + 2 - commits_on_stdin)
 246                usage(local_pull_usage);
 247        if (commits_on_stdin) {
 248                commits = pull_targets_stdin(&commit_id, &write_ref);
 249        } else {
 250                commit_id = (char **) &argv[arg++];
 251                commits = 1;
 252        }
 253        path = argv[arg];
 254
 255        if (pull(commits, commit_id, write_ref, path))
 256                return 1;
 257
 258        if (commits_on_stdin)
 259                pull_targets_free(commits, commit_id, write_ref);
 260
 261        return 0;
 262}