diff options
Diffstat (limited to 'config.c')
| -rw-r--r-- | config.c | 925 |
1 files changed, 925 insertions, 0 deletions
diff --git a/config.c b/config.c new file mode 100644 index 0000000000..c938aa0b15 --- /dev/null +++ b/config.c @@ -0,0 +1,925 @@ +/* + * GIT - The information manager from hell + * + * Copyright (C) Linus Torvalds, 2005 + * Copyright (C) Johannes Schindelin, 2005 + * + */ +#include "cache.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 inline int iskeychar(int c) +{ + return isalnum(c) || 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 (!iskeychar(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 (!iskeychar(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; + if (!strcasecmp(end, "k")) + return val * 1024; + if (!strcasecmp(end, "m")) + return val * 1024 * 1024; + if (!strcasecmp(end, "g")) + return val * 1024 * 1024 * 1024; + } + 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") || !strcasecmp(value, "yes")) + return 1; + if (!strcasecmp(value, "false") || !strcasecmp(value, "no")) + 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.bare")) { + is_bare_repository_cfg = 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, "core.legacyheaders")) { + use_legacy_headers = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "core.compression")) { + int level = git_config_int(var, value); + if (level == -1) + level = Z_DEFAULT_COMPRESSION; + else if (level < 0 || level > Z_BEST_COMPRESSION) + die("bad zlib compression level %d", level); + zlib_compression_level = level; + return 0; + } + + if (!strcmp(var, "core.packedgitwindowsize")) { + int pgsz_x2 = getpagesize() * 2; + packed_git_window_size = git_config_int(var, value); + + /* This value must be multiple of (pagesize * 2) */ + packed_git_window_size /= pgsz_x2; + if (packed_git_window_size < 1) + packed_git_window_size = 1; + packed_git_window_size *= pgsz_x2; + return 0; + } + + if (!strcmp(var, "core.packedgitlimit")) { + packed_git_limit = git_config_int(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")) { + git_commit_encoding = strdup(value); + return 0; + } + + if (!strcmp(var, "i18n.logoutputencoding")) { + git_log_output_encoding = strdup(value); + return 0; + } + + + if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) { + pager_use_color = git_config_bool(var,value); + 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(CONFIG_ENVIRONMENT); + if (!filename) { + home = getenv("HOME"); + filename = getenv(CONFIG_LOCAL_ENVIRONMENT); + if (!filename) + filename = repo_config = xstrdup(git_path("config")); + } + + if (home) { + char *user_config = xstrdup(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); + 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 int write_error() +{ + fprintf(stderr, "Failed to write new configuration file\n"); + + /* Same error code as "failed to rename". */ + return 4; +} + +static int 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; + } + } + + if (write_in_full(fd, "[", 1) != 1 || + write_in_full(fd, key, len1) != len1) + return 0; + if (len2 >= 0) { + if (write_in_full(fd, " \"", 2) != 2) + return 0; + while (--len2 >= 0) { + unsigned char c = *++dot; + if (c == '"') + if (write_in_full(fd, "\\", 1) != 1) + return 0; + if (write_in_full(fd, &c, 1) != 1) + return 0; + } + if (write_in_full(fd, "\"", 1) != 1) + return 0; + } + if (write_in_full(fd, "]\n", 2) != 2) + return 0; + + return 1; +} + +static int store_write_pair(int fd, const char* key, const char* value) +{ + int i; + int length = strlen(key+store.baselen+1); + int quote = 0; + + /* Check to see if the value needs to be quoted. */ + if (value[0] == ' ') + quote = 1; + for (i = 0; value[i]; i++) + if (value[i] == ';' || value[i] == '#') + quote = 1; + if (value[i-1] == ' ') + quote = 1; + + if (write_in_full(fd, "\t", 1) != 1 || + write_in_full(fd, key+store.baselen+1, length) != length || + write_in_full(fd, " = ", 3) != 3) + return 0; + if (quote && write_in_full(fd, "\"", 1) != 1) + return 0; + for (i = 0; value[i]; i++) + switch (value[i]) { + case '\n': + if (write_in_full(fd, "\\n", 2) != 2) + return 0; + break; + case '\t': + if (write_in_full(fd, "\\t", 2) != 2) + return 0; + break; + case '"': + case '\\': + if (write_in_full(fd, "\\", 1) != 1) + return 0; + default: + if (write_in_full(fd, value+i, 1) != 1) + return 0; + break; + } + if (quote && write_in_full(fd, "\"", 1) != 1) + return 0; + if (write_in_full(fd, "\n", 1) != 1) + return 0; + return 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(CONFIG_ENVIRONMENT); + if (!config_filename) { + config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT); + if (!config_filename) + config_filename = git_path("config"); + } + config_filename = xstrdup(config_filename); + lock_file = xstrdup(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 = xmalloc(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 (!iskeychar(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); + } else if (c == '\n') { + fprintf(stderr, "invalid key (newline): %s\n", key); + free(store.key); + ret = 1; + goto out_free; + } + 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; + if (!store_write_section(fd, key) || + !store_write_pair(fd, key, value)) + goto write_err_out; + } 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*)xmalloc(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 = xmmap(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) { + if (write_in_full(fd, contents + copy_begin, + copy_end - copy_begin) < + copy_end - copy_begin) + goto write_err_out; + if (new_line && + write_in_full(fd, "\n", 1) != 1) + goto write_err_out; + } + copy_begin = store.offset[i]; + } + + /* write the pair (value == NULL means unset) */ + if (value != NULL) { + if (store.state == START) { + if (!store_write_section(fd, key)) + goto write_err_out; + } + if (!store_write_pair(fd, key, value)) + goto write_err_out; + } + + /* write the rest of the config */ + if (copy_begin < st.st_size) + if (write_in_full(fd, contents + copy_begin, + st.st_size - copy_begin) < + st.st_size - copy_begin) + goto write_err_out; + + 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); + free(config_filename); + if (lock_file) { + unlink(lock_file); + free(lock_file); + } + return ret; + +write_err_out: + ret = write_error(); + goto out_free; + +} + +int git_config_rename_section(const char *old_name, const char *new_name) +{ + int ret = 0; + char *config_filename; + struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1); + int out_fd; + char buf[1024]; + + config_filename = getenv(CONFIG_ENVIRONMENT); + if (!config_filename) { + config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT); + if (!config_filename) + config_filename = git_path("config"); + } + config_filename = xstrdup(config_filename); + out_fd = hold_lock_file_for_update(lock, config_filename, 0); + if (out_fd < 0) { + ret = error("Could not lock config file!"); + goto out; + } + + if (!(config_file = fopen(config_filename, "rb"))) { + ret = error("Could not open config file!"); + goto out; + } + + while (fgets(buf, sizeof(buf), config_file)) { + int i; + int length; + for (i = 0; buf[i] && isspace(buf[i]); i++) + ; /* do nothing */ + if (buf[i] == '[') { + /* it's a section */ + int j = 0, dot = 0; + for (i++; buf[i] && buf[i] != ']'; i++) { + if (!dot && isspace(buf[i])) { + dot = 1; + if (old_name[j++] != '.') + break; + for (i++; isspace(buf[i]); i++) + ; /* do nothing */ + if (buf[i] != '"') + break; + continue; + } + if (buf[i] == '\\' && dot) + i++; + else if (buf[i] == '"' && dot) { + for (i++; isspace(buf[i]); i++) + ; /* do_nothing */ + break; + } + if (buf[i] != old_name[j++]) + break; + } + if (buf[i] == ']' && old_name[j] == 0) { + /* old_name matches */ + ret++; + store.baselen = strlen(new_name); + if (!store_write_section(out_fd, new_name)) { + ret = write_error(); + goto out; + } + continue; + } + } + length = strlen(buf); + if (write_in_full(out_fd, buf, length) != length) { + ret = write_error(); + goto out; + } + } + fclose(config_file); + if (close(out_fd) || commit_lock_file(lock) < 0) + ret = error("Cannot commit config file!"); + out: + free(config_filename); + return ret; +} + |