a83266ce2f3bd5b3ed8dae1e720825b9d9a4aadb
   1#include "cache.h"
   2
   3#include <sys/types.h>
   4#include <dirent.h>
   5
   6#include "commit.h"
   7#include "tree.h"
   8#include "blob.h"
   9
  10#define REACHABLE 0x0001
  11
  12static int show_tags = 0;
  13static int show_unreachable = 0;
  14static unsigned char head_sha1[20];
  15
  16static void check_connectivity(void)
  17{
  18        int i;
  19
  20        /* Look up all the requirements, warn about missing objects.. */
  21        for (i = 0; i < nr_objs; i++) {
  22                struct object *obj = objs[i];
  23
  24                if (show_unreachable && !(obj->flags & REACHABLE)) {
  25                        printf("unreachable %s %s\n", obj->type, sha1_to_hex(obj->sha1));
  26                        continue;
  27                }
  28
  29                if (!obj->parsed) {
  30                        printf("missing %s %s\n", obj->type, 
  31                               sha1_to_hex(obj->sha1));
  32                }
  33                if (!obj->used) {
  34                        printf("dangling %s %s\n", obj->type, 
  35                               sha1_to_hex(obj->sha1));
  36                }
  37        }
  38}
  39
  40static int fsck_tree(unsigned char *sha1, void *data, unsigned long size)
  41{
  42        struct tree *item = lookup_tree(sha1);
  43        if (parse_tree(item))
  44                return -1;
  45        if (item->has_full_path) {
  46                fprintf(stderr, "warning: fsck-cache: tree %s "
  47                        "has full pathnames in it\n", sha1_to_hex(sha1));
  48        }
  49        return 0;
  50}
  51
  52static int fsck_commit(unsigned char *sha1, void *data, unsigned long size)
  53{
  54        struct commit *commit = lookup_commit(sha1);
  55        if (parse_commit(commit))
  56                return -1;
  57        if (!commit->tree)
  58                return -1;
  59        if (!commit->parents)
  60                printf("root %s\n", sha1_to_hex(sha1));
  61        if (!commit->date)
  62                printf("bad commit date in %s\n", sha1_to_hex(sha1));
  63        return 0;
  64}
  65
  66static int fsck_blob(unsigned char *sha1, void *data, unsigned long size)
  67{
  68        struct blob *blob = lookup_blob(sha1);
  69        blob->object.parsed = 1;
  70        return 0;
  71}
  72
  73static int fsck_tag(unsigned char *sha1, void *data, unsigned long size)
  74{
  75        int typelen, taglen;
  76        unsigned char object[20];
  77        char object_hex[60];
  78        const char *type_line, *tag_line, *sig_line;
  79
  80        if (size < 64)
  81                return -1;
  82        if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
  83                return -1;
  84
  85        type_line = data + 48;
  86        if (memcmp("\ntype ", type_line-1, 6))
  87                return -1;
  88
  89        tag_line = strchr(type_line, '\n');
  90        if (!tag_line || memcmp("tag ", ++tag_line, 4))
  91                return -1;
  92
  93        sig_line = strchr(tag_line, '\n');
  94        if (!sig_line)
  95                return -1;
  96        sig_line++;
  97
  98        typelen = tag_line - type_line - strlen("type \n");
  99        if (typelen >= 20)
 100                return -1;
 101        taglen = sig_line - tag_line - strlen("tag \n");
 102
 103        if (!show_tags)
 104                return 0;
 105
 106        strcpy(object_hex, sha1_to_hex(object));
 107        printf("tagged %.*s %s (%.*s) in %s\n",
 108                typelen, type_line + 5,
 109                object_hex,
 110                taglen, tag_line + 4,
 111                sha1_to_hex(sha1));
 112        return 0;
 113}
 114
 115static int fsck_entry(unsigned char *sha1, char *tag, void *data, 
 116                      unsigned long size)
 117{
 118        if (!strcmp(tag, "blob")) {
 119                if (fsck_blob(sha1, data, size) < 0)
 120                        return -1;
 121        } else if (!strcmp(tag, "tree")) {
 122                if (fsck_tree(sha1, data, size) < 0)
 123                        return -1;
 124        } else if (!strcmp(tag, "commit")) {
 125                if (fsck_commit(sha1, data, size) < 0)
 126                        return -1;
 127        } else if (!strcmp(tag, "tag")) {
 128                if (fsck_tag(sha1, data, size) < 0)
 129                        return -1;
 130        } else
 131                return -1;
 132        return 0;
 133}
 134
 135static int fsck_name(char *hex)
 136{
 137        unsigned char sha1[20];
 138        if (!get_sha1_hex(hex, sha1)) {
 139                unsigned long mapsize;
 140                void *map = map_sha1_file(sha1, &mapsize);
 141                if (map) {
 142                        char type[100];
 143                        unsigned long size;
 144                        void *buffer = unpack_sha1_file(map, mapsize, type, &size);
 145                        if (!buffer)
 146                                return -1;
 147                        if (check_sha1_signature(sha1, buffer, size, type) < 0)
 148                                printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
 149                        munmap(map, mapsize);
 150                        if (!fsck_entry(sha1, type, buffer, size))
 151                                return 0;
 152                }
 153        }
 154        return -1;
 155}
 156
 157static int fsck_dir(int i, char *path)
 158{
 159        DIR *dir = opendir(path);
 160        struct dirent *de;
 161
 162        if (!dir) {
 163                return error("missing sha1 directory '%s'", path);
 164        }
 165
 166        while ((de = readdir(dir)) != NULL) {
 167                char name[100];
 168                int len = strlen(de->d_name);
 169
 170                switch (len) {
 171                case 2:
 172                        if (de->d_name[1] != '.')
 173                                break;
 174                case 1:
 175                        if (de->d_name[0] != '.')
 176                                break;
 177                        continue;
 178                case 38:
 179                        sprintf(name, "%02x", i);
 180                        memcpy(name+2, de->d_name, len+1);
 181                        if (!fsck_name(name))
 182                                continue;
 183                }
 184                fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 185        }
 186        closedir(dir);
 187        return 0;
 188}
 189
 190int main(int argc, char **argv)
 191{
 192        int i, heads;
 193        char *sha1_dir;
 194
 195        for (i = 1; i < argc; i++) {
 196                const char *arg = argv[i];
 197
 198                if (!strcmp(arg, "--unreachable")) {
 199                        show_unreachable = 1;
 200                        continue;
 201                }
 202                if (!strcmp(arg, "--tags")) {
 203                        show_tags = 1;
 204                        continue;
 205                }
 206                if (*arg == '-')
 207                        usage("fsck-cache [--tags] [[--unreachable] <head-sha1>*]");
 208        }
 209
 210        sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
 211        for (i = 0; i < 256; i++) {
 212                static char dir[4096];
 213                sprintf(dir, "%s/%02x", sha1_dir, i);
 214                fsck_dir(i, dir);
 215        }
 216
 217        heads = 0;
 218        for (i = 1; i < argc; i++) {
 219                const char *arg = argv[i]; 
 220
 221                if (*arg == '-')
 222                        continue;
 223
 224                if (!get_sha1_hex(arg, head_sha1)) {
 225                        struct object *obj = &lookup_commit(head_sha1)->object;
 226                        obj->used = 1;
 227                        mark_reachable(obj, REACHABLE);
 228                        heads++;
 229                        continue;
 230                }
 231                error("expected sha1, got %s", arg);
 232        }
 233
 234        if (!heads) {
 235                if (show_unreachable) {
 236                        fprintf(stderr, "unable to do reachability without a head\n");
 237                        show_unreachable = 0; 
 238                }
 239                fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
 240        }
 241
 242        check_connectivity();
 243        return 0;
 244}