diff options
Diffstat (limited to 'config.c')
-rw-r--r-- | config.c | 1316 |
1 files changed, 1316 insertions, 0 deletions
diff --git a/config.c b/config.c new file mode 100644 index 0000000000..37385ce9d3 --- /dev/null +++ b/config.c @@ -0,0 +1,1316 @@ +/* + * GIT - The information manager from hell + * + * Copyright (C) Linus Torvalds, 2005 + * Copyright (C) Johannes Schindelin, 2005 + * + */ +#include "cache.h" +#include "exec_cmd.h" + +#define MAXNAME (256) + +static FILE *config_file; +static const char *config_file_name; +static int config_linenr; +static int config_file_eof; +static int zlib_compression_seen; + +const char *config_exclusive_filename = NULL; + +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_eof = 1; + 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) - 1) + return NULL; + if (c == '\n') { + if (quote) + return NULL; + value[len] = 0; + return value; + } + if (comment) + continue; + if (isspace(c) && !quote) { + if (len) + space++; + continue; + } + if (!quote) { + if (c == ';' || c == '#') { + comment = 1; + continue; + } + } + for (; space; space--) + value[len++] = ' '; + 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, void *data, char *name, unsigned int len) +{ + int c; + char *value; + + /* Get the full name */ + for (;;) { + c = get_next_char(); + if (config_file_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, data); +} + +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 (config_file_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, void *data) +{ + int comment = 0; + int baselen = 0; + static char var[MAXNAME]; + + /* U+FEFF Byte Order Mark in UTF8 */ + static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf"; + const unsigned char *bomptr = utf8_bom; + + for (;;) { + int c = get_next_char(); + if (bomptr && *bomptr) { + /* We are at the file beginning; skip UTF8-encoded BOM + * if present. Sane editors won't put this in on their + * own, but e.g. Windows Notepad will do it happily. */ + if ((unsigned char) c == *bomptr) { + bomptr++; + continue; + } else { + /* Do not tolerate partial BOM. */ + if (bomptr != utf8_bom) + break; + /* No BOM at file beginning. Cool. */ + bomptr = NULL; + } + } + if (c == '\n') { + if (config_file_eof) + 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, data, var, baselen+1) < 0) + break; + } + die("bad config file line %d in %s", config_linenr, config_file_name); +} + +static int parse_unit_factor(const char *end, unsigned long *val) +{ + if (!*end) + return 1; + else if (!strcasecmp(end, "k")) { + *val *= 1024; + return 1; + } + else if (!strcasecmp(end, "m")) { + *val *= 1024 * 1024; + return 1; + } + else if (!strcasecmp(end, "g")) { + *val *= 1024 * 1024 * 1024; + return 1; + } + return 0; +} + +static int git_parse_long(const char *value, long *ret) +{ + if (value && *value) { + char *end; + long val = strtol(value, &end, 0); + unsigned long factor = 1; + if (!parse_unit_factor(end, &factor)) + return 0; + *ret = val * factor; + return 1; + } + return 0; +} + +int git_parse_ulong(const char *value, unsigned long *ret) +{ + if (value && *value) { + char *end; + unsigned long val = strtoul(value, &end, 0); + if (!parse_unit_factor(end, &val)) + return 0; + *ret = val; + return 1; + } + return 0; +} + +static void die_bad_config(const char *name) +{ + if (config_file_name) + die("bad config value for '%s' in %s", name, config_file_name); + die("bad config value for '%s'", name); +} + +int git_config_int(const char *name, const char *value) +{ + long ret = 0; + if (!git_parse_long(value, &ret)) + die_bad_config(name); + return ret; +} + +unsigned long git_config_ulong(const char *name, const char *value) +{ + unsigned long ret; + if (!git_parse_ulong(value, &ret)) + die_bad_config(name); + return ret; +} + +int git_config_bool_or_int(const char *name, const char *value, int *is_bool) +{ + *is_bool = 1; + if (!value) + return 1; + if (!*value) + return 0; + if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on")) + return 1; + if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off")) + return 0; + *is_bool = 0; + return git_config_int(name, value); +} + +int git_config_bool(const char *name, const char *value) +{ + int discard; + return !!git_config_bool_or_int(name, value, &discard); +} + +int git_config_string(const char **dest, const char *var, const char *value) +{ + if (!value) + return config_error_nonbool(var); + *dest = xstrdup(value); + return 0; +} + +int git_config_pathname(const char **dest, const char *var, const char *value) +{ + if (!value) + return config_error_nonbool(var); + *dest = expand_user_path(value); + if (!*dest) + die("Failed to expand user dir in: '%s'", value); + return 0; +} + +static int git_default_core_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.trustctime")) { + trust_ctime = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "core.quotepath")) { + quote_path_fully = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "core.symlinks")) { + has_symlinks = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "core.ignorecase")) { + ignore_case = 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.loosecompression")) { + 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; + zlib_compression_seen = 1; + 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); + core_compression_level = level; + core_compression_seen = 1; + if (!zlib_compression_seen) + 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, "core.deltabasecachelimit")) { + delta_base_cache_limit = git_config_int(var, value); + return 0; + } + + if (!strcmp(var, "core.autocrlf")) { + if (value && !strcasecmp(value, "input")) { + auto_crlf = -1; + return 0; + } + auto_crlf = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "core.safecrlf")) { + if (value && !strcasecmp(value, "warn")) { + safe_crlf = SAFE_CRLF_WARN; + return 0; + } + safe_crlf = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "core.notesref")) { + notes_ref_name = xstrdup(value); + return 0; + } + + if (!strcmp(var, "core.pager")) + return git_config_string(&pager_program, var, value); + + if (!strcmp(var, "core.editor")) + return git_config_string(&editor_program, var, value); + + if (!strcmp(var, "core.excludesfile")) + return git_config_pathname(&excludes_file, var, value); + + if (!strcmp(var, "core.whitespace")) { + if (!value) + return config_error_nonbool(var); + whitespace_rule_cfg = parse_whitespace_rule(value); + return 0; + } + + if (!strcmp(var, "core.fsyncobjectfiles")) { + fsync_object_files = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "core.preloadindex")) { + core_preload_index = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "core.createobject")) { + if (!strcmp(value, "rename")) + object_creation_mode = OBJECT_CREATION_USES_RENAMES; + else if (!strcmp(value, "link")) + object_creation_mode = OBJECT_CREATION_USES_HARDLINKS; + else + die("Invalid mode for object creation: %s", value); + return 0; + } + + /* Add other config variables here and to Documentation/config.txt. */ + return 0; +} + +static int git_default_user_config(const char *var, const char *value) +{ + if (!strcmp(var, "user.name")) { + if (!value) + return config_error_nonbool(var); + strlcpy(git_default_name, value, sizeof(git_default_name)); + if (git_default_email[0]) + user_ident_explicitly_given = 1; + return 0; + } + + if (!strcmp(var, "user.email")) { + if (!value) + return config_error_nonbool(var); + strlcpy(git_default_email, value, sizeof(git_default_email)); + if (git_default_name[0]) + user_ident_explicitly_given = 1; + return 0; + } + + /* Add other config variables here and to Documentation/config.txt. */ + return 0; +} + +static int git_default_i18n_config(const char *var, const char *value) +{ + if (!strcmp(var, "i18n.commitencoding")) + return git_config_string(&git_commit_encoding, var, value); + + if (!strcmp(var, "i18n.logoutputencoding")) + return git_config_string(&git_log_output_encoding, var, value); + + /* Add other config variables here and to Documentation/config.txt. */ + return 0; +} + +static int git_default_branch_config(const char *var, const char *value) +{ + if (!strcmp(var, "branch.autosetupmerge")) { + if (value && !strcasecmp(value, "always")) { + git_branch_track = BRANCH_TRACK_ALWAYS; + return 0; + } + git_branch_track = git_config_bool(var, value); + return 0; + } + if (!strcmp(var, "branch.autosetuprebase")) { + if (!value) + return config_error_nonbool(var); + else if (!strcmp(value, "never")) + autorebase = AUTOREBASE_NEVER; + else if (!strcmp(value, "local")) + autorebase = AUTOREBASE_LOCAL; + else if (!strcmp(value, "remote")) + autorebase = AUTOREBASE_REMOTE; + else if (!strcmp(value, "always")) + autorebase = AUTOREBASE_ALWAYS; + else + return error("Malformed value for %s", var); + return 0; + } + + /* Add other config variables here and to Documentation/config.txt. */ + return 0; +} + +static int git_default_push_config(const char *var, const char *value) +{ + if (!strcmp(var, "push.default")) { + if (!value) + return config_error_nonbool(var); + else if (!strcmp(value, "nothing")) + push_default = PUSH_DEFAULT_NOTHING; + else if (!strcmp(value, "matching")) + push_default = PUSH_DEFAULT_MATCHING; + else if (!strcmp(value, "tracking")) + push_default = PUSH_DEFAULT_TRACKING; + else if (!strcmp(value, "current")) + push_default = PUSH_DEFAULT_CURRENT; + else { + error("Malformed value for %s: %s", var, value); + return error("Must be one of nothing, matching, " + "tracking or current."); + } + return 0; + } + + /* Add other config variables here and to Documentation/config.txt. */ + return 0; +} + +static int git_default_mailmap_config(const char *var, const char *value) +{ + if (!strcmp(var, "mailmap.file")) + return git_config_string(&git_mailmap_file, var, value); + + /* Add other config variables here and to Documentation/config.txt. */ + return 0; +} + +int git_default_config(const char *var, const char *value, void *dummy) +{ + if (!prefixcmp(var, "core.")) + return git_default_core_config(var, value); + + if (!prefixcmp(var, "user.")) + return git_default_user_config(var, value); + + if (!prefixcmp(var, "i18n.")) + return git_default_i18n_config(var, value); + + if (!prefixcmp(var, "branch.")) + return git_default_branch_config(var, value); + + if (!prefixcmp(var, "push.")) + return git_default_push_config(var, value); + + if (!prefixcmp(var, "mailmap.")) + return git_default_mailmap_config(var, value); + + if (!prefixcmp(var, "advice.")) + return git_default_advice_config(var, value); + + 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, void *data) +{ + int ret; + FILE *f = fopen(filename, "r"); + + ret = -1; + if (f) { + config_file = f; + config_file_name = filename; + config_linenr = 1; + config_file_eof = 0; + ret = git_parse_file(fn, data); + fclose(f); + config_file_name = NULL; + } + return ret; +} + +const char *git_etc_gitconfig(void) +{ + static const char *system_wide; + if (!system_wide) + system_wide = system_path(ETC_GITCONFIG); + return system_wide; +} + +static int git_env_bool(const char *k, int def) +{ + const char *v = getenv(k); + return v ? git_config_bool(k, v) : def; +} + +int git_config_system(void) +{ + return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0); +} + +int git_config_global(void) +{ + return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0); +} + +int git_config(config_fn_t fn, void *data) +{ + int ret = 0, found = 0; + char *repo_config = NULL; + const char *home = NULL; + + /* Setting $GIT_CONFIG makes git read _only_ the given config file. */ + if (config_exclusive_filename) + return git_config_from_file(fn, config_exclusive_filename, data); + if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) { + ret += git_config_from_file(fn, git_etc_gitconfig(), + data); + found += 1; + } + + home = getenv("HOME"); + if (git_config_global() && home) { + char *user_config = xstrdup(mkpath("%s/.gitconfig", home)); + if (!access(user_config, R_OK)) { + ret += git_config_from_file(fn, user_config, data); + found += 1; + } + free(user_config); + } + + repo_config = git_pathdup("config"); + if (!access(repo_config, R_OK)) { + ret += git_config_from_file(fn, repo_config, data); + found += 1; + } + free(repo_config); + if (found == 0) + return -1; + 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; + size_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, void *cb) +{ + const char *ep; + size_t section_len; + + switch (store.state) { + case KEY_SEEN: + if (matches(key, value)) { + if (store.seen == 1 && store.multi_replace == 0) { + warning("%s has multiple values", key); + } else if (store.seen >= MAX_MATCHES) { + error("too many matches for %s", key); + return 1; + } + + store.offset[store.seen] = ftell(config_file); + store.seen++; + } + break; + case SECTION_SEEN: + /* + * What we are looking for is in store.key (both + * section and var), and its section part is baselen + * long. We found key (again, both section and var). + * We would want to know if this key is in the same + * section as what we are looking for. We already + * know we are in the same section as what should + * hold store.key. + */ + ep = strrchr(key, '.'); + section_len = ep - key; + + if ((section_len != store.baselen) || + memcmp(key, store.key, section_len+1)) { + store.state = SECTION_END_SEEN; + break; + } + + /* + * Do not increment matches: this is no match, but we + * just made sure we are in the desired section. + */ + 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(const char *filename) +{ + error("failed to write new configuration file %s", filename); + + /* Same error code as "failed to rename". */ + return 4; +} + +static int store_write_section(int fd, const char *key) +{ + const char *dot; + int i, success; + struct strbuf sb = STRBUF_INIT; + + dot = memchr(key, '.', store.baselen); + if (dot) { + strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key); + for (i = dot - key + 1; i < store.baselen; i++) { + if (key[i] == '"' || key[i] == '\\') + strbuf_addch(&sb, '\\'); + strbuf_addch(&sb, key[i]); + } + strbuf_addstr(&sb, "\"]\n"); + } else { + strbuf_addf(&sb, "[%.*s]\n", store.baselen, key); + } + + success = write_in_full(fd, sb.buf, sb.len) == sb.len; + strbuf_release(&sb); + + return success; +} + +static int store_write_pair(int fd, const char *key, const char *value) +{ + int i, success; + int length = strlen(key + store.baselen + 1); + const char *quote = ""; + struct strbuf sb = STRBUF_INIT; + + /* + * Check to see if the value needs to be surrounded with a dq pair. + * Note that problematic characters are always backslash-quoted; this + * check is about not losing leading or trailing SP and strings that + * follow beginning-of-comment characters (i.e. ';' and '#') by the + * configuration parser. + */ + if (value[0] == ' ') + quote = "\""; + for (i = 0; value[i]; i++) + if (value[i] == ';' || value[i] == '#') + quote = "\""; + if (i && value[i - 1] == ' ') + quote = "\""; + + strbuf_addf(&sb, "\t%.*s = %s", + length, key + store.baselen + 1, quote); + + for (i = 0; value[i]; i++) + switch (value[i]) { + case '\n': + strbuf_addstr(&sb, "\\n"); + break; + case '\t': + strbuf_addstr(&sb, "\\t"); + break; + case '"': + case '\\': + strbuf_addch(&sb, '\\'); + default: + strbuf_addch(&sb, value[i]); + break; + } + strbuf_addf(&sb, "%s\n", quote); + + success = write_in_full(fd, sb.buf, sb.len) == sb.len; + strbuf_release(&sb); + + return success; +} + +static ssize_t find_beginning_of_line(const char *contents, size_t size, + size_t offset_, int *found_bracket) +{ + size_t equal_offset = size, bracket_offset = size; + ssize_t offset; + +contline: + for (offset = offset_-2; offset > 0 + && contents[offset] != '\n'; offset--) + switch (contents[offset]) { + case '=': equal_offset = offset; break; + case ']': bracket_offset = offset; break; + } + if (offset > 0 && contents[offset-1] == '\\') { + offset_ = offset; + goto contline; + } + 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; + struct lock_file *lock = NULL; + const char *last_dot = strrchr(key, '.'); + + if (config_exclusive_filename) + config_filename = xstrdup(config_exclusive_filename); + else + config_filename = git_pathdup("config"); + + /* + * 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) { + error("key does not contain a section: %s", 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))) { + error("invalid key: %s", key); + free(store.key); + ret = 1; + goto out_free; + } + c = tolower(c); + } else if (c == '\n') { + error("invalid key (newline): %s", key); + free(store.key); + ret = 1; + goto out_free; + } + store.key[i] = c; + } + store.key[i] = 0; + + /* + * The lock serves a purpose in addition to locking: the new + * contents of .git/config will be written into it. + */ + lock = xcalloc(sizeof(struct lock_file), 1); + fd = hold_lock_file_for_update(lock, config_filename, 0); + if (fd < 0) { + error("could not lock config file %s: %s", config_filename, strerror(errno)); + 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; + size_t contents_sz, copy_begin, copy_end; + int i, 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)) { + error("invalid pattern: %s", 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, NULL)) { + error("invalid config file %s", config_filename); + 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_sz = xsize_t(st.st_size); + contents = xmmap(NULL, contents_sz, 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 = contents_sz; + } else if (store.state != KEY_SEEN) { + copy_end = store.offset[i]; + } else + copy_end = find_beginning_of_line( + contents, contents_sz, + store.offset[i]-2, &new_line); + + if (copy_end > 0 && contents[copy_end-1] != '\n') + new_line = 1; + + /* 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_str_in_full(fd, "\n") != 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 < contents_sz) + if (write_in_full(fd, contents + copy_begin, + contents_sz - copy_begin) < + contents_sz - copy_begin) + goto write_err_out; + + munmap(contents, contents_sz); + } + + if (commit_lock_file(lock) < 0) { + error("could not commit config file %s", config_filename); + ret = 4; + goto out_free; + } + + /* + * lock is committed, so don't try to roll it back below. + * NOTE: Since lockfile.c keeps a linked list of all created + * lock_file structures, it isn't safe to free(lock). It's + * better to just leave it hanging around. + */ + lock = NULL; + ret = 0; + +out_free: + if (lock) + rollback_lock_file(lock); + free(config_filename); + return ret; + +write_err_out: + ret = write_error(lock->filename); + goto out_free; + +} + +static int section_name_match (const char *buf, const char *name) +{ + int i = 0, j = 0, dot = 0; + if (buf[i] != '[') + return 0; + for (i = 1; buf[i] && buf[i] != ']'; i++) { + if (!dot && isspace(buf[i])) { + dot = 1; + if (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] != name[j++]) + break; + } + if (buf[i] == ']' && name[j] == 0) { + /* + * We match, now just find the right length offset by + * gobbling up any whitespace after it, as well + */ + i++; + for (; buf[i] && isspace(buf[i]); i++) + ; /* do nothing */ + return i; + } + return 0; +} + +/* if new_name == NULL, the section is removed instead */ +int git_config_rename_section(const char *old_name, const char *new_name) +{ + int ret = 0, remove = 0; + char *config_filename; + struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1); + int out_fd; + char buf[1024]; + + if (config_exclusive_filename) + config_filename = xstrdup(config_exclusive_filename); + else + config_filename = git_pathdup("config"); + out_fd = hold_lock_file_for_update(lock, config_filename, 0); + if (out_fd < 0) { + ret = error("could not lock config file %s", config_filename); + goto out; + } + + if (!(config_file = fopen(config_filename, "rb"))) { + /* no config file means nothing to rename, no error */ + goto unlock_and_out; + } + + while (fgets(buf, sizeof(buf), config_file)) { + int i; + int length; + char *output = buf; + for (i = 0; buf[i] && isspace(buf[i]); i++) + ; /* do nothing */ + if (buf[i] == '[') { + /* it's a section */ + int offset = section_name_match(&buf[i], old_name); + if (offset > 0) { + ret++; + if (new_name == NULL) { + remove = 1; + continue; + } + store.baselen = strlen(new_name); + if (!store_write_section(out_fd, new_name)) { + ret = write_error(lock->filename); + goto out; + } + /* + * We wrote out the new section, with + * a newline, now skip the old + * section's length + */ + output += offset + i; + if (strlen(output) > 0) { + /* + * More content means there's + * a declaration to put on the + * next line; indent with a + * tab + */ + output -= 1; + output[0] = '\t'; + } + } + remove = 0; + } + if (remove) + continue; + length = strlen(output); + if (write_in_full(out_fd, output, length) != length) { + ret = write_error(lock->filename); + goto out; + } + } + fclose(config_file); + unlock_and_out: + if (commit_lock_file(lock) < 0) + ret = error("could not commit config file %s", config_filename); + out: + free(config_filename); + return ret; +} + +/* + * Call this to report error for your variable that should not + * get a boolean value (i.e. "[my] var" means "true"). + */ +int config_error_nonbool(const char *var) +{ + return error("Missing value for '%s'", var); +} |