/* * GIT - The information manager from hell * * Copyright (C) Linus Torvalds, 2005 * Copyright (C) Johannes Schindelin, 2005 * */ #include "cache.h" #include <regex.h> #define MAXNAME (256) static FILE *config_file; static const char *config_file_name; static int config_linenr; static int get_next_char(void) { int c; FILE *f; c = '\n'; if ((f = config_file) != NULL) { c = fgetc(f); if (c == '\r') { /* DOS like systems */ c = fgetc(f); if (c != '\n') { ungetc(c, f); c = '\r'; } } if (c == '\n') config_linenr++; if (c == EOF) { config_file = NULL; c = '\n'; } } return c; } static char *parse_value(void) { static char value[1024]; int quote = 0, comment = 0, len = 0, space = 0; for (;;) { int c = get_next_char(); if (len >= sizeof(value)) return NULL; if (c == '\n') { if (quote) return NULL; value[len] = 0; return value; } if (comment) continue; if (isspace(c) && !quote) { space = 1; continue; } if (!quote) { if (c == ';' || c == '#') { comment = 1; continue; } } if (space) { if (len) value[len++] = ' '; space = 0; } if (c == '\\') { c = get_next_char(); switch (c) { case '\n': continue; case 't': c = '\t'; break; case 'b': c = '\b'; break; case 'n': c = '\n'; break; /* Some characters escape as themselves */ case '\\': case '"': break; /* Reject unknown escape sequences */ default: return NULL; } value[len++] = c; continue; } if (c == '"') { quote = 1-quote; continue; } value[len++] = c; } } static int get_value(config_fn_t fn, char *name, unsigned int len) { int c; char *value; /* Get the full name */ for (;;) { c = get_next_char(); if (c == EOF) break; if (!isalnum(c)) break; name[len++] = tolower(c); if (len >= MAXNAME) return -1; } name[len] = 0; while (c == ' ' || c == '\t') c = get_next_char(); value = NULL; if (c != '\n') { if (c != '=') return -1; value = parse_value(); if (!value) return -1; } return fn(name, value); } static int get_extended_base_var(char *name, int baselen, int c) { do { if (c == '\n') return -1; c = get_next_char(); } while (isspace(c)); /* We require the format to be '[base "extension"]' */ if (c != '"') return -1; name[baselen++] = '.'; for (;;) { int c = get_next_char(); if (c == '\n') return -1; if (c == '"') break; if (c == '\\') { c = get_next_char(); if (c == '\n') return -1; } name[baselen++] = c; if (baselen > MAXNAME / 2) return -1; } /* Final ']' */ if (get_next_char() != ']') return -1; return baselen; } static int get_base_var(char *name) { int baselen = 0; for (;;) { int c = get_next_char(); if (c == EOF) return -1; if (c == ']') return baselen; if (isspace(c)) return get_extended_base_var(name, baselen, c); if (!isalnum(c) && c != '.') return -1; if (baselen > MAXNAME / 2) return -1; name[baselen++] = tolower(c); } } static int git_parse_file(config_fn_t fn) { int comment = 0; int baselen = 0; static char var[MAXNAME]; for (;;) { int c = get_next_char(); if (c == '\n') { /* EOF? */ if (!config_file) return 0; comment = 0; continue; } if (comment || isspace(c)) continue; if (c == '#' || c == ';') { comment = 1; continue; } if (c == '[') { baselen = get_base_var(var); if (baselen <= 0) break; var[baselen++] = '.'; var[baselen] = 0; continue; } if (!isalpha(c)) break; var[baselen] = tolower(c); if (get_value(fn, var, baselen+1) < 0) break; } die("bad config file line %d in %s", config_linenr, config_file_name); } int git_config_int(const char *name, const char *value) { if (value && *value) { char *end; int val = strtol(value, &end, 0); if (!*end) return val; } die("bad config value for '%s' in %s", name, config_file_name); } int git_config_bool(const char *name, const char *value) { if (!value) return 1; if (!*value) return 0; if (!strcasecmp(value, "true")) return 1; if (!strcasecmp(value, "false")) return 0; return git_config_int(name, value) != 0; } int git_default_config(const char *var, const char *value) { /* This needs a better name */ if (!strcmp(var, "core.filemode")) { trust_executable_bit = git_config_bool(var, value); return 0; } if (!strcmp(var, "core.ignorestat")) { assume_unchanged = git_config_bool(var, value); return 0; } if (!strcmp(var, "core.prefersymlinkrefs")) { prefer_symlink_refs = git_config_bool(var, value); return 0; } if (!strcmp(var, "core.logallrefupdates")) { log_all_ref_updates = git_config_bool(var, value); return 0; } if (!strcmp(var, "core.warnambiguousrefs")) { warn_ambiguous_refs = git_config_bool(var, value); return 0; } if (!strcmp(var, "user.name")) { strlcpy(git_default_name, value, sizeof(git_default_name)); return 0; } if (!strcmp(var, "user.email")) { strlcpy(git_default_email, value, sizeof(git_default_email)); return 0; } if (!strcmp(var, "i18n.commitencoding")) { strlcpy(git_commit_encoding, value, sizeof(git_commit_encoding)); return 0; } /* Add other config variables here and to Documentation/config.txt. */ return 0; } int git_config_from_file(config_fn_t fn, const char *filename) { int ret; FILE *f = fopen(filename, "r"); ret = -1; if (f) { config_file = f; config_file_name = filename; config_linenr = 1; ret = git_parse_file(fn); fclose(f); config_file_name = NULL; } return ret; } int git_config(config_fn_t fn) { int ret = 0; char *repo_config = NULL; const char *home = NULL, *filename; /* $GIT_CONFIG makes git read _only_ the given config file, * $GIT_CONFIG_LOCAL will make it process it in addition to the * global config file, the same way it would the per-repository * config file otherwise. */ filename = getenv("GIT_CONFIG"); if (!filename) { home = getenv("HOME"); filename = getenv("GIT_CONFIG_LOCAL"); if (!filename) filename = repo_config = strdup(git_path("config")); } if (home) { char *user_config = strdup(mkpath("%s/.gitconfig", home)); if (!access(user_config, R_OK)) ret = git_config_from_file(fn, user_config); free(user_config); } ret += git_config_from_file(fn, filename); if (repo_config) free(repo_config); return ret; } /* * Find all the stuff for git_config_set() below. */ #define MAX_MATCHES 512 static struct { int baselen; char* key; int do_not_match; regex_t* value_regex; int multi_replace; off_t offset[MAX_MATCHES]; enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state; int seen; } store; static int matches(const char* key, const char* value) { return !strcmp(key, store.key) && (store.value_regex == NULL || (store.do_not_match ^ !regexec(store.value_regex, value, 0, NULL, 0))); } static int store_aux(const char* key, const char* value) { switch (store.state) { case KEY_SEEN: if (matches(key, value)) { if (store.seen == 1 && store.multi_replace == 0) { fprintf(stderr, "Warning: %s has multiple values\n", key); } else if (store.seen >= MAX_MATCHES) { fprintf(stderr, "Too many matches\n"); return 1; } store.offset[store.seen] = ftell(config_file); store.seen++; } break; case SECTION_SEEN: if (strncmp(key, store.key, store.baselen+1)) { store.state = SECTION_END_SEEN; break; } else /* do not increment matches: this is no match */ store.offset[store.seen] = ftell(config_file); /* fallthru */ case SECTION_END_SEEN: case START: if (matches(key, value)) { store.offset[store.seen] = ftell(config_file); store.state = KEY_SEEN; store.seen++; } else { if (strrchr(key, '.') - key == store.baselen && !strncmp(key, store.key, store.baselen)) { store.state = SECTION_SEEN; store.offset[store.seen] = ftell(config_file); } } } return 0; } static void store_write_section(int fd, const char* key) { const char *dot = strchr(key, '.'); int len1 = store.baselen, len2 = -1; dot = strchr(key, '.'); if (dot) { int dotlen = dot - key; if (dotlen < len1) { len2 = len1 - dotlen - 1; len1 = dotlen; } } write(fd, "[", 1); write(fd, key, len1); if (len2 >= 0) { write(fd, " \"", 2); while (--len2 >= 0) { unsigned char c = *++dot; if (c == '"') write(fd, "\\", 1); write(fd, &c, 1); } write(fd, "\"", 1); } write(fd, "]\n", 2); } static void store_write_pair(int fd, const char* key, const char* value) { int i; write(fd, "\t", 1); write(fd, key+store.baselen+1, strlen(key+store.baselen+1)); write(fd, " = ", 3); for (i = 0; value[i]; i++) switch (value[i]) { case '\n': write(fd, "\\n", 2); break; case '\t': write(fd, "\\t", 2); break; case '"': case '\\': write(fd, "\\", 1); default: write(fd, value+i, 1); } write(fd, "\n", 1); } static int find_beginning_of_line(const char* contents, int size, int offset_, int* found_bracket) { int equal_offset = size, bracket_offset = size; int offset; for (offset = offset_-2; offset > 0 && contents[offset] != '\n'; offset--) switch (contents[offset]) { case '=': equal_offset = offset; break; case ']': bracket_offset = offset; break; } if (bracket_offset < equal_offset) { *found_bracket = 1; offset = bracket_offset+1; } else offset++; return offset; } int git_config_set(const char* key, const char* value) { return git_config_set_multivar(key, value, NULL, 0); } /* * If value==NULL, unset in (remove from) config, * if value_regex!=NULL, disregard key/value pairs where value does not match. * if multi_replace==0, nothing, or only one matching key/value is replaced, * else all matching key/values (regardless how many) are removed, * before the new pair is written. * * Returns 0 on success. * * This function does this: * * - it locks the config file by creating ".git/config.lock" * * - it then parses the config using store_aux() as validator to find * the position on the key/value pair to replace. If it is to be unset, * it must be found exactly once. * * - the config file is mmap()ed and the part before the match (if any) is * written to the lock file, then the changed part and the rest. * * - the config file is removed and the lock file rename()d to it. * */ int git_config_set_multivar(const char* key, const char* value, const char* value_regex, int multi_replace) { int i, dot; int fd = -1, in_fd; int ret; char* config_filename; char* lock_file; const char* last_dot = strrchr(key, '.'); config_filename = getenv("GIT_CONFIG"); if (!config_filename) { config_filename = getenv("GIT_CONFIG_LOCAL"); if (!config_filename) config_filename = git_path("config"); } config_filename = strdup(config_filename); lock_file = strdup(mkpath("%s.lock", config_filename)); /* * Since "key" actually contains the section name and the real * key name separated by a dot, we have to know where the dot is. */ if (last_dot == NULL) { fprintf(stderr, "key does not contain a section: %s\n", key); ret = 2; goto out_free; } store.baselen = last_dot - key; store.multi_replace = multi_replace; /* * Validate the key and while at it, lower case it for matching. */ store.key = (char*)malloc(strlen(key)+1); dot = 0; for (i = 0; key[i]; i++) { unsigned char c = key[i]; if (c == '.') dot = 1; /* Leave the extended basename untouched.. */ if (!dot || i > store.baselen) { if (!isalnum(c) || (i == store.baselen+1 && !isalpha(c))) { fprintf(stderr, "invalid key: %s\n", key); free(store.key); ret = 1; goto out_free; } c = tolower(c); } store.key[i] = c; } store.key[i] = 0; /* * The lock_file serves a purpose in addition to locking: the new * contents of .git/config will be written into it. */ fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666); if (fd < 0 || adjust_shared_perm(lock_file)) { fprintf(stderr, "could not lock config file\n"); free(store.key); ret = -1; goto out_free; } /* * If .git/config does not exist yet, write a minimal version. */ in_fd = open(config_filename, O_RDONLY); if ( in_fd < 0 ) { free(store.key); if ( ENOENT != errno ) { error("opening %s: %s", config_filename, strerror(errno)); ret = 3; /* same as "invalid config file" */ goto out_free; } /* if nothing to unset, error out */ if (value == NULL) { ret = 5; goto out_free; } store.key = (char*)key; store_write_section(fd, key); store_write_pair(fd, key, value); } else{ struct stat st; char* contents; int i, copy_begin, copy_end, new_line = 0; if (value_regex == NULL) store.value_regex = NULL; else { if (value_regex[0] == '!') { store.do_not_match = 1; value_regex++; } else store.do_not_match = 0; store.value_regex = (regex_t*)malloc(sizeof(regex_t)); if (regcomp(store.value_regex, value_regex, REG_EXTENDED)) { fprintf(stderr, "Invalid pattern: %s\n", value_regex); free(store.value_regex); ret = 6; goto out_free; } } store.offset[0] = 0; store.state = START; store.seen = 0; /* * After this, store.offset will contain the *end* offset * of the last match, or remain at 0 if no match was found. * As a side effect, we make sure to transform only a valid * existing config file. */ if (git_config_from_file(store_aux, config_filename)) { fprintf(stderr, "invalid config file\n"); free(store.key); if (store.value_regex != NULL) { regfree(store.value_regex); free(store.value_regex); } ret = 3; goto out_free; } free(store.key); if (store.value_regex != NULL) { regfree(store.value_regex); free(store.value_regex); } /* if nothing to unset, or too many matches, error out */ if ((store.seen == 0 && value == NULL) || (store.seen > 1 && multi_replace == 0)) { ret = 5; goto out_free; } fstat(in_fd, &st); contents = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, in_fd, 0); close(in_fd); if (store.seen == 0) store.seen = 1; for (i = 0, copy_begin = 0; i < store.seen; i++) { if (store.offset[i] == 0) { store.offset[i] = copy_end = st.st_size; } else if (store.state != KEY_SEEN) { copy_end = store.offset[i]; } else copy_end = find_beginning_of_line( contents, st.st_size, store.offset[i]-2, &new_line); /* write the first part of the config */ if (copy_end > copy_begin) { write(fd, contents + copy_begin, copy_end - copy_begin); if (new_line) write(fd, "\n", 1); } copy_begin = store.offset[i]; } /* write the pair (value == NULL means unset) */ if (value != NULL) { if (store.state == START) store_write_section(fd, key); store_write_pair(fd, key, value); } /* write the rest of the config */ if (copy_begin < st.st_size) write(fd, contents + copy_begin, st.st_size - copy_begin); munmap(contents, st.st_size); unlink(config_filename); } if (rename(lock_file, config_filename) < 0) { fprintf(stderr, "Could not rename the lock file?\n"); ret = 4; goto out_free; } ret = 0; out_free: if (0 <= fd) close(fd); if (config_filename) free(config_filename); if (lock_file) { unlink(lock_file); free(lock_file); } return ret; }