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