/* * 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;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)) 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 (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);}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){ int comment = 0; int baselen = 0; static char var[MAXNAME]; for (;;) { int c = get_next_char(); 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, 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;}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; 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(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_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_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.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.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, "user.name")) { if (!value) return config_error_nonbool(var); strlcpy(git_default_name, value, sizeof(git_default_name)); return 0; } if (!strcmp(var, "user.email")) { if (!value) return config_error_nonbool(var); strlcpy(git_default_email, value, sizeof(git_default_email)); return 0; } 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); if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) { pager_use_color = git_config_bool(var,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_string(&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; } /* 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; config_file_eof = 0; ret = git_parse_file(fn); fclose(f); config_file_name = NULL; } return ret;}const char *git_etc_gitconfig(void){ static const char *system_wide; if (!system_wide) { system_wide = ETC_GITCONFIG; if (!is_absolute_path(system_wide)) { /* interpret path relative to exec-dir */ struct strbuf d = STRBUF_INIT; strbuf_addf(&d, "%s/%s", git_exec_path(), system_wide); system_wide = strbuf_detach(&d, NULL); } } return system_wide;}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){ 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) { if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) ret += git_config_from_file(fn, git_etc_gitconfig()); home = getenv("HOME"); filename = getenv(CONFIG_LOCAL_ENVIRONMENT); if (!filename) filename = repo_config = xstrdup(git_path("config")); } 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); 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 512static 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){ 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) { 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: /* * 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(void){ 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; int i, success; struct strbuf sb; strbuf_init(&sb, 0); 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] == '"') 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; /* * 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_init(&sb, 0); 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, '.'); 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); /* * 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 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) { 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; 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)) { 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_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_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 < 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) { fprintf(stderr, "Cannot commit config file!\n"); 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(); goto out_free;}static int section_name_match (const char *buf, const char *name){ int i = 0, j = 0, dot = 0; for (; 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; } return (buf[i] == ']' && name[j] == 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]; 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"))) { /* no config file means nothing to rename, no error */ goto unlock_and_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 */ if (section_name_match (&buf[i+1], old_name)) { ret++; if (new_name == NULL) { remove = 1; continue; } store.baselen = strlen(new_name); if (!store_write_section(out_fd, new_name)) { ret = write_error(); goto out; } continue; } remove = 0; } if (remove) continue; length = strlen(buf); if (write_in_full(out_fd, buf, length) != length) { ret = write_error(); goto out; } } fclose(config_file); unlock_and_out: if (commit_lock_file(lock) < 0) ret = error("Cannot commit config file!"); 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);}