880 lines
19 KiB
C
880 lines
19 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 "util.h"
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#include "cache.h"
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#include "exec_cmd.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 config_file_eof;
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const char *config_exclusive_filename = NULL;
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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_eof = 1;
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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, space = 0;
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size_t len = 0;
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for (;;) {
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int c = get_next_char();
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if (len >= sizeof(value) - 1)
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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, void *data, 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 (config_file_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, data);
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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 ch = get_next_char();
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if (ch == '\n')
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return -1;
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if (ch == '"')
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break;
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if (ch == '\\') {
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ch = get_next_char();
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if (ch == '\n')
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return -1;
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}
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name[baselen++] = ch;
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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 (config_file_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 perf_parse_file(config_fn_t fn, void *data)
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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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/* U+FEFF Byte Order Mark in UTF8 */
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static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
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const unsigned char *bomptr = utf8_bom;
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for (;;) {
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int c = get_next_char();
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if (bomptr && *bomptr) {
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/* We are at the file beginning; skip UTF8-encoded BOM
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* if present. Sane editors won't put this in on their
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* own, but e.g. Windows Notepad will do it happily. */
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if ((unsigned char) c == *bomptr) {
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bomptr++;
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continue;
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} else {
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/* Do not tolerate partial BOM. */
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if (bomptr != utf8_bom)
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break;
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/* No BOM at file beginning. Cool. */
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bomptr = NULL;
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}
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}
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if (c == '\n') {
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if (config_file_eof)
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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, data, 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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static int parse_unit_factor(const char *end, unsigned long *val)
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{
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if (!*end)
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return 1;
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else if (!strcasecmp(end, "k")) {
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*val *= 1024;
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return 1;
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}
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else if (!strcasecmp(end, "m")) {
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*val *= 1024 * 1024;
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return 1;
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}
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else if (!strcasecmp(end, "g")) {
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*val *= 1024 * 1024 * 1024;
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return 1;
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}
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return 0;
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}
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static int perf_parse_long(const char *value, long *ret)
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{
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if (value && *value) {
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char *end;
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long val = strtol(value, &end, 0);
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unsigned long factor = 1;
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if (!parse_unit_factor(end, &factor))
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return 0;
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*ret = val * factor;
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return 1;
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}
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return 0;
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}
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int perf_parse_ulong(const char *value, unsigned long *ret)
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{
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if (value && *value) {
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char *end;
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unsigned long val = strtoul(value, &end, 0);
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if (!parse_unit_factor(end, &val))
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return 0;
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*ret = val;
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return 1;
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}
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return 0;
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}
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static void die_bad_config(const char *name)
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{
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if (config_file_name)
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die("bad config value for '%s' in %s", name, config_file_name);
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die("bad config value for '%s'", name);
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}
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int perf_config_int(const char *name, const char *value)
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{
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long ret = 0;
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if (!perf_parse_long(value, &ret))
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die_bad_config(name);
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return ret;
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}
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unsigned long perf_config_ulong(const char *name, const char *value)
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{
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unsigned long ret;
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if (!perf_parse_ulong(value, &ret))
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die_bad_config(name);
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return ret;
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}
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int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
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{
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*is_bool = 1;
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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") || !strcasecmp(value, "on"))
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return 1;
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if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
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return 0;
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*is_bool = 0;
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return perf_config_int(name, value);
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}
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int perf_config_bool(const char *name, const char *value)
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{
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int discard;
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return !!perf_config_bool_or_int(name, value, &discard);
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}
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int perf_config_string(const char **dest, const char *var, const char *value)
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{
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if (!value)
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return config_error_nonbool(var);
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*dest = strdup(value);
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return 0;
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}
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static int perf_default_core_config(const char *var __used, const char *value __used)
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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 perf_default_config(const char *var, const char *value, void *dummy __used)
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{
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if (!prefixcmp(var, "core."))
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return perf_default_core_config(var, value);
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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 perf_config_from_file(config_fn_t fn, const char *filename, void *data)
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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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config_file_eof = 0;
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ret = perf_parse_file(fn, data);
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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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const char *perf_etc_perfconfig(void)
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{
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static const char *system_wide;
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if (!system_wide)
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system_wide = system_path(ETC_PERFCONFIG);
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return system_wide;
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}
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static int perf_env_bool(const char *k, int def)
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{
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const char *v = getenv(k);
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return v ? perf_config_bool(k, v) : def;
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}
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int perf_config_system(void)
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{
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return !perf_env_bool("PERF_CONFIG_NOSYSTEM", 0);
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}
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int perf_config_global(void)
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{
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return !perf_env_bool("PERF_CONFIG_NOGLOBAL", 0);
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}
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int perf_config(config_fn_t fn, void *data)
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{
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int ret = 0, found = 0;
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char *repo_config = NULL;
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const char *home = NULL;
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/* Setting $PERF_CONFIG makes perf read _only_ the given config file. */
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if (config_exclusive_filename)
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return perf_config_from_file(fn, config_exclusive_filename, data);
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if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK)) {
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ret += perf_config_from_file(fn, perf_etc_perfconfig(),
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data);
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found += 1;
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}
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home = getenv("HOME");
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if (perf_config_global() && home) {
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char *user_config = strdup(mkpath("%s/.perfconfig", home));
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if (!access(user_config, R_OK)) {
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ret += perf_config_from_file(fn, user_config, data);
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found += 1;
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}
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free(user_config);
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}
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repo_config = perf_pathdup("config");
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if (!access(repo_config, R_OK)) {
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ret += perf_config_from_file(fn, repo_config, data);
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found += 1;
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}
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free(repo_config);
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if (found == 0)
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return -1;
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return ret;
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}
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/*
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* Find all the stuff for perf_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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size_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, void *cb __used)
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{
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int section_len;
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const char *ep;
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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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warning("%s has multiple values", key);
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} else if (store.seen >= MAX_MATCHES) {
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error("too many matches for %s", key);
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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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/*
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* What we are looking for is in store.key (both
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* section and var), and its section part is baselen
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* long. We found key (again, both section and var).
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* We would want to know if this key is in the same
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* section as what we are looking for. We already
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* know we are in the same section as what should
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* hold store.key.
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*/
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ep = strrchr(key, '.');
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section_len = ep - key;
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if ((section_len != store.baselen) ||
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memcmp(key, store.key, section_len+1)) {
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store.state = SECTION_END_SEEN;
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break;
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}
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/*
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* Do not increment matches: this is no match, but we
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* just made sure we are in the desired section.
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*/
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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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default:
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break;
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}
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return 0;
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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;
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int i, success;
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struct strbuf sb = STRBUF_INIT;
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dot = memchr(key, '.', store.baselen);
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if (dot) {
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strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
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for (i = dot - key + 1; i < store.baselen; i++) {
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if (key[i] == '"' || key[i] == '\\')
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strbuf_addch(&sb, '\\');
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strbuf_addch(&sb, key[i]);
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}
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strbuf_addstr(&sb, "\"]\n");
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} else {
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strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
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}
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success = (write_in_full(fd, sb.buf, sb.len) == (ssize_t)sb.len);
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strbuf_release(&sb);
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return success;
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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, success;
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int length = strlen(key + store.baselen + 1);
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const char *quote = "";
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struct strbuf sb = STRBUF_INIT;
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/*
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* Check to see if the value needs to be surrounded with a dq pair.
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* Note that problematic characters are always backslash-quoted; this
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* 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) == (ssize_t)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;
|
|
default: 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 perf_config_set(const char* key, const char* value)
|
|
{
|
|
return perf_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 ".perf/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 perf_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 = 0;
|
|
char* config_filename;
|
|
const char* last_dot = strrchr(key, '.');
|
|
|
|
if (config_exclusive_filename)
|
|
config_filename = strdup(config_exclusive_filename);
|
|
else
|
|
config_filename = perf_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 = malloc(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;
|
|
|
|
/*
|
|
* If .perf/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;
|
|
ssize_t contents_sz, copy_begin, copy_end;
|
|
int 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)) {
|
|
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 (perf_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 = mmap(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);
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
out_free:
|
|
free(config_filename);
|
|
return ret;
|
|
|
|
write_err_out:
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|