зеркало из https://github.com/microsoft/git.git
924 строки
20 KiB
C
924 строки
20 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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* Copyright (C) Johannes Schindelin, 2005
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*
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*/
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#include "cache.h"
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#define MAXNAME (256)
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static FILE *config_file;
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static const char *config_file_name;
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static int config_linenr;
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static int get_next_char(void)
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{
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int c;
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FILE *f;
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c = '\n';
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if ((f = config_file) != NULL) {
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c = fgetc(f);
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if (c == '\r') {
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/* DOS like systems */
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c = fgetc(f);
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if (c != '\n') {
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ungetc(c, f);
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c = '\r';
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}
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}
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if (c == '\n')
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config_linenr++;
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if (c == EOF) {
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config_file = NULL;
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c = '\n';
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}
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}
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return c;
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}
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static char *parse_value(void)
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{
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static char value[1024];
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int quote = 0, comment = 0, len = 0, space = 0;
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for (;;) {
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int c = get_next_char();
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if (len >= sizeof(value))
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return NULL;
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if (c == '\n') {
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if (quote)
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return NULL;
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value[len] = 0;
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return value;
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}
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if (comment)
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continue;
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if (isspace(c) && !quote) {
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space = 1;
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continue;
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}
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if (!quote) {
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if (c == ';' || c == '#') {
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comment = 1;
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continue;
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}
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}
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if (space) {
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if (len)
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value[len++] = ' ';
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space = 0;
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}
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if (c == '\\') {
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c = get_next_char();
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switch (c) {
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case '\n':
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continue;
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case 't':
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c = '\t';
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break;
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case 'b':
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c = '\b';
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break;
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case 'n':
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c = '\n';
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break;
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/* Some characters escape as themselves */
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case '\\': case '"':
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break;
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/* Reject unknown escape sequences */
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default:
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return NULL;
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}
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value[len++] = c;
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continue;
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}
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if (c == '"') {
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quote = 1-quote;
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continue;
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}
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value[len++] = c;
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}
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}
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static inline int iskeychar(int c)
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{
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return isalnum(c) || c == '-';
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}
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static int get_value(config_fn_t fn, char *name, unsigned int len)
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{
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int c;
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char *value;
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/* Get the full name */
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for (;;) {
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c = get_next_char();
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if (c == EOF)
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break;
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if (!iskeychar(c))
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break;
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name[len++] = tolower(c);
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if (len >= MAXNAME)
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return -1;
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}
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name[len] = 0;
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while (c == ' ' || c == '\t')
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c = get_next_char();
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value = NULL;
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if (c != '\n') {
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if (c != '=')
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return -1;
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value = parse_value();
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if (!value)
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return -1;
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}
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return fn(name, value);
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}
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static int get_extended_base_var(char *name, int baselen, int c)
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{
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do {
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if (c == '\n')
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return -1;
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c = get_next_char();
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} while (isspace(c));
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/* We require the format to be '[base "extension"]' */
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if (c != '"')
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return -1;
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name[baselen++] = '.';
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for (;;) {
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int c = get_next_char();
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if (c == '\n')
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return -1;
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if (c == '"')
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break;
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if (c == '\\') {
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c = get_next_char();
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if (c == '\n')
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return -1;
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}
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name[baselen++] = c;
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if (baselen > MAXNAME / 2)
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return -1;
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}
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/* Final ']' */
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if (get_next_char() != ']')
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return -1;
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return baselen;
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}
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static int get_base_var(char *name)
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{
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int baselen = 0;
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for (;;) {
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int c = get_next_char();
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if (c == EOF)
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return -1;
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if (c == ']')
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return baselen;
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if (isspace(c))
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return get_extended_base_var(name, baselen, c);
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if (!iskeychar(c) && c != '.')
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return -1;
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if (baselen > MAXNAME / 2)
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return -1;
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name[baselen++] = tolower(c);
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}
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}
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static int git_parse_file(config_fn_t fn)
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{
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int comment = 0;
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int baselen = 0;
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static char var[MAXNAME];
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for (;;) {
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int c = get_next_char();
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if (c == '\n') {
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/* EOF? */
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if (!config_file)
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return 0;
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comment = 0;
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continue;
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}
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if (comment || isspace(c))
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continue;
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if (c == '#' || c == ';') {
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comment = 1;
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continue;
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}
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if (c == '[') {
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baselen = get_base_var(var);
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if (baselen <= 0)
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break;
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var[baselen++] = '.';
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var[baselen] = 0;
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continue;
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}
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if (!isalpha(c))
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break;
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var[baselen] = tolower(c);
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if (get_value(fn, var, baselen+1) < 0)
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break;
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}
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die("bad config file line %d in %s", config_linenr, config_file_name);
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}
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int git_config_int(const char *name, const char *value)
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{
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if (value && *value) {
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char *end;
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int val = strtol(value, &end, 0);
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if (!*end)
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return val;
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if (!strcasecmp(end, "k"))
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return val * 1024;
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if (!strcasecmp(end, "m"))
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return val * 1024 * 1024;
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if (!strcasecmp(end, "g"))
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return val * 1024 * 1024 * 1024;
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}
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die("bad config value for '%s' in %s", name, config_file_name);
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}
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int git_config_bool(const char *name, const char *value)
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{
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if (!value)
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return 1;
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if (!*value)
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return 0;
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if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
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return 1;
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if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
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return 0;
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return git_config_int(name, value) != 0;
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}
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int git_default_config(const char *var, const char *value)
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{
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/* This needs a better name */
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if (!strcmp(var, "core.filemode")) {
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trust_executable_bit = git_config_bool(var, value);
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return 0;
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}
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if (!strcmp(var, "core.bare")) {
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is_bare_repository_cfg = git_config_bool(var, value);
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return 0;
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}
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if (!strcmp(var, "core.ignorestat")) {
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assume_unchanged = git_config_bool(var, value);
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return 0;
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}
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if (!strcmp(var, "core.prefersymlinkrefs")) {
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prefer_symlink_refs = git_config_bool(var, value);
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return 0;
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}
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if (!strcmp(var, "core.logallrefupdates")) {
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log_all_ref_updates = git_config_bool(var, value);
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return 0;
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}
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if (!strcmp(var, "core.warnambiguousrefs")) {
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warn_ambiguous_refs = git_config_bool(var, value);
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return 0;
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}
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if (!strcmp(var, "core.legacyheaders")) {
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use_legacy_headers = git_config_bool(var, value);
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return 0;
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}
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if (!strcmp(var, "core.compression")) {
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int level = git_config_int(var, value);
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if (level == -1)
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level = Z_DEFAULT_COMPRESSION;
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else if (level < 0 || level > Z_BEST_COMPRESSION)
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die("bad zlib compression level %d", level);
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zlib_compression_level = level;
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return 0;
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}
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if (!strcmp(var, "core.packedgitwindowsize")) {
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int pgsz = getpagesize();
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packed_git_window_size = git_config_int(var, value);
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packed_git_window_size /= pgsz;
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if (packed_git_window_size < 2)
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packed_git_window_size = 2;
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packed_git_window_size *= pgsz;
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return 0;
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}
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if (!strcmp(var, "core.packedgitlimit")) {
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packed_git_limit = git_config_int(var, value);
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return 0;
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}
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if (!strcmp(var, "user.name")) {
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strlcpy(git_default_name, value, sizeof(git_default_name));
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return 0;
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}
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if (!strcmp(var, "user.email")) {
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strlcpy(git_default_email, value, sizeof(git_default_email));
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return 0;
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}
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if (!strcmp(var, "i18n.commitencoding")) {
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git_commit_encoding = strdup(value);
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return 0;
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}
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if (!strcmp(var, "i18n.logoutputencoding")) {
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git_log_output_encoding = strdup(value);
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return 0;
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}
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if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
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pager_use_color = git_config_bool(var,value);
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return 0;
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}
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/* Add other config variables here and to Documentation/config.txt. */
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return 0;
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}
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int git_config_from_file(config_fn_t fn, const char *filename)
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{
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int ret;
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FILE *f = fopen(filename, "r");
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ret = -1;
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if (f) {
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config_file = f;
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config_file_name = filename;
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config_linenr = 1;
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ret = git_parse_file(fn);
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fclose(f);
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config_file_name = NULL;
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}
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return ret;
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}
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int git_config(config_fn_t fn)
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{
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int ret = 0;
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char *repo_config = NULL;
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const char *home = NULL, *filename;
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/* $GIT_CONFIG makes git read _only_ the given config file,
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* $GIT_CONFIG_LOCAL will make it process it in addition to the
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* global config file, the same way it would the per-repository
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* config file otherwise. */
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filename = getenv(CONFIG_ENVIRONMENT);
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if (!filename) {
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home = getenv("HOME");
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filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
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if (!filename)
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filename = repo_config = xstrdup(git_path("config"));
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}
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if (home) {
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char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
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if (!access(user_config, R_OK))
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ret = git_config_from_file(fn, user_config);
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free(user_config);
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}
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ret += git_config_from_file(fn, filename);
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free(repo_config);
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return ret;
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}
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/*
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* Find all the stuff for git_config_set() below.
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*/
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#define MAX_MATCHES 512
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static struct {
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int baselen;
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char* key;
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int do_not_match;
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regex_t* value_regex;
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int multi_replace;
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off_t offset[MAX_MATCHES];
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enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
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int seen;
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} store;
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static int matches(const char* key, const char* value)
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{
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return !strcmp(key, store.key) &&
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(store.value_regex == NULL ||
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(store.do_not_match ^
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!regexec(store.value_regex, value, 0, NULL, 0)));
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}
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static int store_aux(const char* key, const char* value)
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{
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switch (store.state) {
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case KEY_SEEN:
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if (matches(key, value)) {
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if (store.seen == 1 && store.multi_replace == 0) {
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fprintf(stderr,
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"Warning: %s has multiple values\n",
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key);
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} else if (store.seen >= MAX_MATCHES) {
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fprintf(stderr, "Too many matches\n");
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return 1;
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}
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store.offset[store.seen] = ftell(config_file);
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store.seen++;
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}
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break;
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case SECTION_SEEN:
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if (strncmp(key, store.key, store.baselen+1)) {
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store.state = SECTION_END_SEEN;
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break;
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} else
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/* do not increment matches: this is no match */
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store.offset[store.seen] = ftell(config_file);
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/* fallthru */
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case SECTION_END_SEEN:
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case START:
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if (matches(key, value)) {
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store.offset[store.seen] = ftell(config_file);
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store.state = KEY_SEEN;
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store.seen++;
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} else {
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if (strrchr(key, '.') - key == store.baselen &&
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!strncmp(key, store.key, store.baselen)) {
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store.state = SECTION_SEEN;
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store.offset[store.seen] = ftell(config_file);
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}
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}
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}
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return 0;
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}
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static int write_error()
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{
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fprintf(stderr, "Failed to write new configuration file\n");
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/* Same error code as "failed to rename". */
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return 4;
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}
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static int store_write_section(int fd, const char* key)
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{
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const char *dot = strchr(key, '.');
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int len1 = store.baselen, len2 = -1;
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dot = strchr(key, '.');
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if (dot) {
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int dotlen = dot - key;
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if (dotlen < len1) {
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len2 = len1 - dotlen - 1;
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len1 = dotlen;
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}
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}
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if (write_in_full(fd, "[", 1) != 1 ||
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write_in_full(fd, key, len1) != len1)
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return 0;
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if (len2 >= 0) {
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if (write_in_full(fd, " \"", 2) != 2)
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return 0;
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while (--len2 >= 0) {
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unsigned char c = *++dot;
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if (c == '"')
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if (write_in_full(fd, "\\", 1) != 1)
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return 0;
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if (write_in_full(fd, &c, 1) != 1)
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return 0;
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}
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if (write_in_full(fd, "\"", 1) != 1)
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return 0;
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}
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if (write_in_full(fd, "]\n", 2) != 2)
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return 0;
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return 1;
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}
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static int store_write_pair(int fd, const char* key, const char* value)
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{
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int i;
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int length = strlen(key+store.baselen+1);
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int quote = 0;
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/* Check to see if the value needs to be quoted. */
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if (value[0] == ' ')
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quote = 1;
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for (i = 0; value[i]; i++)
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if (value[i] == ';' || value[i] == '#')
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quote = 1;
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if (value[i-1] == ' ')
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quote = 1;
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if (write_in_full(fd, "\t", 1) != 1 ||
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write_in_full(fd, key+store.baselen+1, length) != length ||
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write_in_full(fd, " = ", 3) != 3)
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return 0;
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if (quote && write_in_full(fd, "\"", 1) != 1)
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return 0;
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for (i = 0; value[i]; i++)
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switch (value[i]) {
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case '\n':
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if (write_in_full(fd, "\\n", 2) != 2)
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return 0;
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break;
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case '\t':
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if (write_in_full(fd, "\\t", 2) != 2)
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return 0;
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break;
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case '"':
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case '\\':
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if (write_in_full(fd, "\\", 1) != 1)
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return 0;
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default:
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if (write_in_full(fd, value+i, 1) != 1)
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return 0;
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break;
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}
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if (quote && write_in_full(fd, "\"", 1) != 1)
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return 0;
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if (write_in_full(fd, "\n", 1) != 1)
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return 0;
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return 1;
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}
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static int find_beginning_of_line(const char* contents, int size,
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int offset_, int* found_bracket)
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{
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int equal_offset = size, bracket_offset = size;
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int offset;
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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 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;
|
|
}
|
|
|