| /* |
| * 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 (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; |
| } |
| if (!quote) { |
| if (c == ';' || c == '#') { |
| comment = 1; |
| 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_base_var(char *name) |
| { |
| int baselen = 0; |
| |
| for (;;) { |
| int c = get_next_char(); |
| if (c == EOF) |
| return -1; |
| if (c == ']') |
| return baselen; |
| 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.symrefsonly")) { |
| only_use_symrefs = git_config_bool(var, value); |
| return 0; |
| } |
| |
| if (!strcmp(var, "user.name")) { |
| strncpy(git_default_name, value, sizeof(git_default_name)); |
| return 0; |
| } |
| |
| if (!strcmp(var, "user.email")) { |
| strncpy(git_default_email, value, sizeof(git_default_email)); |
| return 0; |
| } |
| |
| if (!strcmp(var, "i18n.commitencoding")) { |
| strncpy(git_commit_encoding, value, sizeof(git_commit_encoding)); |
| return 0; |
| } |
| |
| /* Add other config variables here.. */ |
| 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) |
| { |
| return git_config_from_file(fn, git_path("config")); |
| } |
| |
| /* |
| * 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(!strncmp(key, store.key, store.baselen)) |
| store.state = SECTION_SEEN; |
| } |
| return 0; |
| } |
| |
| static void store_write_section(int fd, const char* key) |
| { |
| write(fd, "[", 1); |
| write(fd, key, store.baselen); |
| 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; |
| struct stat st; |
| int fd; |
| char* config_filename = strdup(git_path("config")); |
| char* lock_file = strdup(git_path("config.lock")); |
| const char* last_dot = strrchr(key, '.'); |
| |
| /* |
| * 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); |
| return 2; |
| } |
| 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); |
| for (i = 0; key[i]; i++) |
| if (i != store.baselen && |
| ((!isalnum(key[i]) && key[i] != '.') || |
| (i == store.baselen+1 && !isalpha(key[i])))) { |
| fprintf(stderr, "invalid key: %s\n", key); |
| free(store.key); |
| return 1; |
| } else |
| store.key[i] = tolower(key[i]); |
| 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) { |
| fprintf(stderr, "could not lock config file\n"); |
| free(store.key); |
| return -1; |
| } |
| |
| /* |
| * If .git/config does not exist yet, write a minimal version. |
| */ |
| if (stat(config_filename, &st)) { |
| static const char contents[] = |
| "#\n" |
| "# This is the config file\n" |
| "#\n" |
| "\n"; |
| |
| free(store.key); |
| |
| /* if nothing to unset, error out */ |
| if (value == NULL) { |
| close(fd); |
| unlink(lock_file); |
| return 5; |
| } |
| |
| store.key = (char*)key; |
| |
| write(fd, contents, sizeof(contents)-1); |
| store_write_section(fd, key); |
| store_write_pair(fd, key, value); |
| } else{ |
| int in_fd; |
| 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", |
| value_regex); |
| free(store.value_regex); |
| return 6; |
| } |
| } |
| |
| 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(store_aux)) { |
| fprintf(stderr, "invalid config file\n"); |
| free(store.key); |
| if (store.value_regex != NULL) { |
| regfree(store.value_regex); |
| free(store.value_regex); |
| } |
| return 3; |
| } |
| |
| 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)) { |
| close(fd); |
| unlink(lock_file); |
| return 5; |
| } |
| |
| in_fd = open(config_filename, O_RDONLY, 0666); |
| 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); |
| } |
| |
| close(fd); |
| |
| if (rename(lock_file, config_filename) < 0) { |
| fprintf(stderr, "Could not rename the lock file?\n"); |
| return 4; |
| } |
| |
| return 0; |
| } |
| |
| |