Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2
   3const char *prefix_path(const char *prefix, int len, const char *path)
   4{
   5        const char *orig = path;
   6        for (;;) {
   7                char c;
   8                if (*path != '.')
   9                        break;
  10                c = path[1];
  11                /* "." */
  12                if (!c) {
  13                        path++;
  14                        break;
  15                }
  16                /* "./" */
  17                if (c == '/') {
  18                        path += 2;
  19                        continue;
  20                }
  21                if (c != '.')
  22                        break;
  23                c = path[2];
  24                if (!c)
  25                        path += 2;
  26                else if (c == '/')
  27                        path += 3;
  28                else
  29                        break;
  30                /* ".." and "../" */
  31                /* Remove last component of the prefix */
  32                do {
  33                        if (!len)
  34                                die("'%s' is outside repository", orig);
  35                        len--;
  36                } while (len && prefix[len-1] != '/');
  37                continue;
  38        }
  39        if (len) {
  40                int speclen = strlen(path);
  41                char *n = xmalloc(speclen + len + 1);
  42        
  43                memcpy(n, prefix, len);
  44                memcpy(n + len, path, speclen+1);
  45                path = n;
  46        }
  47        return path;
  48}
  49
  50/* 
  51 * Unlike prefix_path, this should be used if the named file does
  52 * not have to interact with index entry; i.e. name of a random file
  53 * on the filesystem.
  54 */
  55const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
  56{
  57        static char path[PATH_MAX];
  58        if (!pfx || !*pfx || arg[0] == '/')
  59                return arg;
  60        memcpy(path, pfx, pfx_len);
  61        strcpy(path + pfx_len, arg);
  62        return path;
  63}
  64
  65/*
  66 * Verify a filename that we got as an argument for a pathspec
  67 * entry. Note that a filename that begins with "-" never verifies
  68 * as true, because even if such a filename were to exist, we want
  69 * it to be preceded by the "--" marker (or we want the user to
  70 * use a format like "./-filename")
  71 */
  72void verify_filename(const char *prefix, const char *arg)
  73{
  74        const char *name;
  75        struct stat st;
  76
  77        if (*arg == '-')
  78                die("bad flag '%s' used after filename", arg);
  79        name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
  80        if (!lstat(name, &st))
  81                return;
  82        if (errno == ENOENT)
  83                die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
  84                    "Use '--' to separate paths from revisions", arg);
  85        die("'%s': %s", arg, strerror(errno));
  86}
  87
  88/*
  89 * Opposite of the above: the command line did not have -- marker
  90 * and we parsed the arg as a refname.  It should not be interpretable
  91 * as a filename.
  92 */
  93void verify_non_filename(const char *prefix, const char *arg)
  94{
  95        const char *name;
  96        struct stat st;
  97
  98        if (is_inside_git_dir())
  99                return;
 100        if (*arg == '-')
 101                return; /* flag */
 102        name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
 103        if (!lstat(name, &st))
 104                die("ambiguous argument '%s': both revision and filename\n"
 105                    "Use '--' to separate filenames from revisions", arg);
 106        if (errno != ENOENT)
 107                die("'%s': %s", arg, strerror(errno));
 108}
 109
 110const char **get_pathspec(const char *prefix, const char **pathspec)
 111{
 112        const char *entry = *pathspec;
 113        const char **p;
 114        int prefixlen;
 115
 116        if (!prefix && !entry)
 117                return NULL;
 118
 119        if (!entry) {
 120                static const char *spec[2];
 121                spec[0] = prefix;
 122                spec[1] = NULL;
 123                return spec;
 124        }
 125
 126        /* Otherwise we have to re-write the entries.. */
 127        p = pathspec;
 128        prefixlen = prefix ? strlen(prefix) : 0;
 129        do {
 130                *p = prefix_path(prefix, prefixlen, entry);
 131        } while ((entry = *++p) != NULL);
 132        return (const char **) pathspec;
 133}
 134
 135/*
 136 * Test if it looks like we're at a git directory.
 137 * We want to see:
 138 *
 139 *  - either a objects/ directory _or_ the proper
 140 *    GIT_OBJECT_DIRECTORY environment variable
 141 *  - a refs/ directory
 142 *  - either a HEAD symlink or a HEAD file that is formatted as
 143 *    a proper "ref:", or a regular file HEAD that has a properly
 144 *    formatted sha1 object name.
 145 */
 146static int is_git_directory(const char *suspect)
 147{
 148        char path[PATH_MAX];
 149        size_t len = strlen(suspect);
 150
 151        strcpy(path, suspect);
 152        if (getenv(DB_ENVIRONMENT)) {
 153                if (access(getenv(DB_ENVIRONMENT), X_OK))
 154                        return 0;
 155        }
 156        else {
 157                strcpy(path + len, "/objects");
 158                if (access(path, X_OK))
 159                        return 0;
 160        }
 161
 162        strcpy(path + len, "/refs");
 163        if (access(path, X_OK))
 164                return 0;
 165
 166        strcpy(path + len, "/HEAD");
 167        if (validate_headref(path))
 168                return 0;
 169
 170        return 1;
 171}
 172
 173static int inside_git_dir = -1;
 174
 175int is_inside_git_dir(void)
 176{
 177        if (inside_git_dir < 0) {
 178                char buffer[1024];
 179
 180                if (is_bare_repository())
 181                        return (inside_git_dir = 1);
 182                if (getcwd(buffer, sizeof(buffer))) {
 183                        const char *git_dir = get_git_dir(), *cwd = buffer;
 184                        while (*git_dir && *git_dir == *cwd) {
 185                                git_dir++;
 186                                cwd++;
 187                        }
 188                        inside_git_dir = !*git_dir;
 189                } else
 190                        inside_git_dir = 0;
 191        }
 192        return inside_git_dir;
 193}
 194
 195const char *setup_git_directory_gently(int *nongit_ok)
 196{
 197        static char cwd[PATH_MAX+1];
 198        const char *gitdirenv;
 199        int len, offset;
 200
 201        /*
 202         * If GIT_DIR is set explicitly, we're not going
 203         * to do any discovery, but we still do repository
 204         * validation.
 205         */
 206        gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
 207        if (gitdirenv) {
 208                if (PATH_MAX - 40 < strlen(gitdirenv))
 209                        die("'$%s' too big", GIT_DIR_ENVIRONMENT);
 210                if (is_git_directory(gitdirenv))
 211                        return NULL;
 212                if (nongit_ok) {
 213                        *nongit_ok = 1;
 214                        return NULL;
 215                }
 216                die("Not a git repository: '%s'", gitdirenv);
 217        }
 218
 219        if (!getcwd(cwd, sizeof(cwd)-1) || cwd[0] != '/')
 220                die("Unable to read current working directory");
 221
 222        offset = len = strlen(cwd);
 223        for (;;) {
 224                if (is_git_directory(".git"))
 225                        break;
 226                chdir("..");
 227                do {
 228                        if (!offset) {
 229                                if (is_git_directory(cwd)) {
 230                                        if (chdir(cwd))
 231                                                die("Cannot come back to cwd");
 232                                        setenv(GIT_DIR_ENVIRONMENT, cwd, 1);
 233                                        inside_git_dir = 1;
 234                                        return NULL;
 235                                }
 236                                if (nongit_ok) {
 237                                        if (chdir(cwd))
 238                                                die("Cannot come back to cwd");
 239                                        *nongit_ok = 1;
 240                                        return NULL;
 241                                }
 242                                die("Not a git repository");
 243                        }
 244                } while (cwd[--offset] != '/');
 245        }
 246
 247        if (offset == len)
 248                return NULL;
 249
 250        /* Make "offset" point to past the '/', and add a '/' at the end */
 251        offset++;
 252        cwd[len++] = '/';
 253        cwd[len] = 0;
 254        inside_git_dir = !prefixcmp(cwd + offset, ".git/");
 255        return cwd + offset;
 256}
 257
 258int git_config_perm(const char *var, const char *value)
 259{
 260        if (value) {
 261                if (!strcmp(value, "umask"))
 262                        return PERM_UMASK;
 263                if (!strcmp(value, "group"))
 264                        return PERM_GROUP;
 265                if (!strcmp(value, "all") ||
 266                    !strcmp(value, "world") ||
 267                    !strcmp(value, "everybody"))
 268                        return PERM_EVERYBODY;
 269        }
 270        return git_config_bool(var, value);
 271}
 272
 273int check_repository_format_version(const char *var, const char *value)
 274{
 275       if (strcmp(var, "core.repositoryformatversion") == 0)
 276               repository_format_version = git_config_int(var, value);
 277        else if (strcmp(var, "core.sharedrepository") == 0)
 278                shared_repository = git_config_perm(var, value);
 279       return 0;
 280}
 281
 282int check_repository_format(void)
 283{
 284        git_config(check_repository_format_version);
 285        if (GIT_REPO_VERSION < repository_format_version)
 286                die ("Expected git repo version <= %d, found %d",
 287                     GIT_REPO_VERSION, repository_format_version);
 288        return 0;
 289}
 290
 291const char *setup_git_directory(void)
 292{
 293        const char *retval = setup_git_directory_gently(NULL);
 294        check_repository_format();
 295        return retval;
 296}