diff options
Diffstat (limited to 'setup.c')
| -rw-r--r-- | setup.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/setup.c b/setup.c new file mode 100644 index 0000000000..fe7f884696 --- /dev/null +++ b/setup.c @@ -0,0 +1,245 @@ +#include "cache.h" + +const char *prefix_path(const char *prefix, int len, const char *path) +{ + const char *orig = path; + for (;;) { + char c; + if (*path != '.') + break; + c = path[1]; + /* "." */ + if (!c) { + path++; + break; + } + /* "./" */ + if (c == '/') { + path += 2; + continue; + } + if (c != '.') + break; + c = path[2]; + if (!c) + path += 2; + else if (c == '/') + path += 3; + else + break; + /* ".." and "../" */ + /* Remove last component of the prefix */ + do { + if (!len) + die("'%s' is outside repository", orig); + len--; + } while (len && prefix[len-1] != '/'); + continue; + } + if (len) { + int speclen = strlen(path); + char *n = xmalloc(speclen + len + 1); + + memcpy(n, prefix, len); + memcpy(n + len, path, speclen+1); + path = n; + } + return path; +} + +/* + * Unlike prefix_path, this should be used if the named file does + * not have to interact with index entry; i.e. name of a random file + * on the filesystem. + */ +const char *prefix_filename(const char *pfx, int pfx_len, const char *arg) +{ + static char path[PATH_MAX]; + if (!pfx || !*pfx || arg[0] == '/') + return arg; + memcpy(path, pfx, pfx_len); + strcpy(path + pfx_len, arg); + return path; +} + +/* + * Verify a filename that we got as an argument for a pathspec + * entry. Note that a filename that begins with "-" never verifies + * as true, because even if such a filename were to exist, we want + * it to be preceded by the "--" marker (or we want the user to + * use a format like "./-filename") + */ +void verify_filename(const char *prefix, const char *arg) +{ + const char *name; + struct stat st; + + if (*arg == '-') + die("bad flag '%s' used after filename", arg); + name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg; + if (!lstat(name, &st)) + return; + if (errno == ENOENT) + die("ambiguous argument '%s': unknown revision or path not in the working tree.\n" + "Use '--' to separate paths from revisions", arg); + die("'%s': %s", arg, strerror(errno)); +} + +/* + * Opposite of the above: the command line did not have -- marker + * and we parsed the arg as a refname. It should not be interpretable + * as a filename. + */ +void verify_non_filename(const char *prefix, const char *arg) +{ + const char *name; + struct stat st; + + if (*arg == '-') + return; /* flag */ + name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg; + if (!lstat(name, &st)) + die("ambiguous argument '%s': both revision and filename\n" + "Use '--' to separate filenames from revisions", arg); + if (errno != ENOENT) + die("'%s': %s", arg, strerror(errno)); +} + +const char **get_pathspec(const char *prefix, const char **pathspec) +{ + const char *entry = *pathspec; + const char **p; + int prefixlen; + + if (!prefix && !entry) + return NULL; + + if (!entry) { + static const char *spec[2]; + spec[0] = prefix; + spec[1] = NULL; + return spec; + } + + /* Otherwise we have to re-write the entries.. */ + p = pathspec; + prefixlen = prefix ? strlen(prefix) : 0; + do { + *p = prefix_path(prefix, prefixlen, entry); + } while ((entry = *++p) != NULL); + return (const char **) pathspec; +} + +/* + * Test if it looks like we're at the top level git directory. + * We want to see: + * + * - either a .git/objects/ directory _or_ the proper + * GIT_OBJECT_DIRECTORY environment variable + * - a refs/ directory under ".git" + * - either a HEAD symlink or a HEAD file that is formatted as + * a proper "ref:". + */ +static int is_toplevel_directory(void) +{ + if (access(".git/refs/", X_OK) || + access(getenv(DB_ENVIRONMENT) ? + getenv(DB_ENVIRONMENT) : ".git/objects/", X_OK) || + validate_symref(".git/HEAD")) + return 0; + return 1; +} + +const char *setup_git_directory_gently(int *nongit_ok) +{ + static char cwd[PATH_MAX+1]; + int len, offset; + + /* + * If GIT_DIR is set explicitly, we're not going + * to do any discovery, but we still do repository + * validation. + */ + if (getenv(GIT_DIR_ENVIRONMENT)) { + char path[PATH_MAX]; + int len = strlen(getenv(GIT_DIR_ENVIRONMENT)); + if (sizeof(path) - 40 < len) + die("'$%s' too big", GIT_DIR_ENVIRONMENT); + memcpy(path, getenv(GIT_DIR_ENVIRONMENT), len); + + strcpy(path + len, "/refs"); + if (access(path, X_OK)) + goto bad_dir_environ; + strcpy(path + len, "/HEAD"); + if (validate_symref(path)) + goto bad_dir_environ; + if (getenv(DB_ENVIRONMENT)) { + if (access(getenv(DB_ENVIRONMENT), X_OK)) + goto bad_dir_environ; + } + else { + strcpy(path + len, "/objects"); + if (access(path, X_OK)) + goto bad_dir_environ; + } + return NULL; + bad_dir_environ: + path[len] = 0; + die("Not a git repository: '%s'", path); + } + + if (!getcwd(cwd, sizeof(cwd)) || cwd[0] != '/') + die("Unable to read current working directory"); + + offset = len = strlen(cwd); + for (;;) { + if (is_toplevel_directory()) + break; + chdir(".."); + do { + if (!offset) { + if (nongit_ok) { + if (chdir(cwd)) + die("Cannot come back to cwd"); + *nongit_ok = 1; + return NULL; + } + die("Not a git repository"); + } + } while (cwd[--offset] != '/'); + } + + if (offset == len) + return NULL; + + /* Make "offset" point to past the '/', and add a '/' at the end */ + offset++; + cwd[len++] = '/'; + cwd[len] = 0; + return cwd + offset; +} + +int check_repository_format_version(const char *var, const char *value) +{ + if (strcmp(var, "core.repositoryformatversion") == 0) + repository_format_version = git_config_int(var, value); + else if (strcmp(var, "core.sharedrepository") == 0) + shared_repository = git_config_bool(var, value); + return 0; +} + +int check_repository_format(void) +{ + git_config(check_repository_format_version); + if (GIT_REPO_VERSION < repository_format_version) + die ("Expected git repo version <= %d, found %d", + GIT_REPO_VERSION, repository_format_version); + return 0; +} + +const char *setup_git_directory(void) +{ + const char *retval = setup_git_directory_gently(NULL); + check_repository_format(); + return retval; +} |