4f629539cd
This makes init-db repository version aware. It checks if an existing config file says the repository being reinitialized is of a wrong version and aborts before doing further harm. When copying the templates, it makes sure the they are of the right repository format version. Otherwise the templates are ignored with an warning message. It copies the templates before creating the HEAD, and if the config file is copied from the template directory, reads it, primarily to pick up the value of core.symrefsonly. It changes the way the result of the filemode reliability test is written to the configuration file using git_config_set(). The test is done even if the config file was copied from the templates. And finally, our own repository format version is written to the config file. Signed-off-by: Junio C Hamano <junkio@cox.net>
589 lines
12 KiB
C
589 lines
12 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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#include <regex.h>
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#define MAXNAME (256)
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static FILE *config_file;
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static 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 (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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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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value[len++] = c;
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}
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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 (!isalnum(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_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 (!isalnum(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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}
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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"))
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return 1;
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if (!strcasecmp(value, "false"))
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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.symrefsonly")) {
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only_use_symrefs = git_config_bool(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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strncpy(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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strncpy(git_default_email, value, sizeof(git_default_email));
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return 0;
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}
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/* Add other config variables here.. */
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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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return git_config_from_file(fn, git_path("config"));
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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 if(!strncmp(key, store.key, store.baselen))
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store.state = SECTION_SEEN;
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}
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return 0;
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}
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static void store_write_section(int fd, const char* key)
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{
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write(fd, "[", 1);
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write(fd, key, store.baselen);
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write(fd, "]\n", 2);
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}
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static void 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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write(fd, "\t", 1);
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write(fd, key+store.baselen+1,
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strlen(key+store.baselen+1));
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write(fd, " = ", 3);
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for (i = 0; value[i]; i++)
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switch (value[i]) {
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case '\n': write(fd, "\\n", 2); break;
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case '\t': write(fd, "\\t", 2); break;
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case '"': case '\\': write(fd, "\\", 1);
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default: write(fd, value+i, 1);
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}
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write(fd, "\n", 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
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&& contents[offset] != '\n'; offset--)
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switch (contents[offset]) {
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case '=': equal_offset = offset; break;
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case ']': bracket_offset = offset; break;
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}
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if (bracket_offset < equal_offset) {
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*found_bracket = 1;
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offset = bracket_offset+1;
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} else
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offset++;
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return offset;
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}
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int git_config_set(const char* key, const char* value)
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{
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return git_config_set_multivar(key, value, NULL, 0);
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}
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/*
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* If value==NULL, unset in (remove from) config,
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* if value_regex!=NULL, disregard key/value pairs where value does not match.
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* if multi_replace==0, nothing, or only one matching key/value is replaced,
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* else all matching key/values (regardless how many) are removed,
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* before the new pair is written.
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*
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* Returns 0 on success.
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*
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* This function does this:
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*
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* - it locks the config file by creating ".git/config.lock"
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*
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* - it then parses the config using store_aux() as validator to find
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* the position on the key/value pair to replace. If it is to be unset,
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* it must be found exactly once.
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*
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* - the config file is mmap()ed and the part before the match (if any) is
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* written to the lock file, then the changed part and the rest.
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*
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* - the config file is removed and the lock file rename()d to it.
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*
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*/
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int git_config_set_multivar(const char* key, const char* value,
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const char* value_regex, int multi_replace)
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{
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int i;
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struct stat st;
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int fd;
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char* config_filename = strdup(git_path("config"));
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char* lock_file = strdup(git_path("config.lock"));
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const char* last_dot = strrchr(key, '.');
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/*
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* Since "key" actually contains the section name and the real
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* key name separated by a dot, we have to know where the dot is.
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*/
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if (last_dot == NULL) {
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fprintf(stderr, "key does not contain a section: %s\n", key);
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return 2;
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}
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store.baselen = last_dot - key;
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store.multi_replace = multi_replace;
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/*
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* Validate the key and while at it, lower case it for matching.
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*/
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store.key = (char*)malloc(strlen(key)+1);
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for (i = 0; key[i]; i++)
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if (i != store.baselen &&
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((!isalnum(key[i]) && key[i] != '.') ||
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(i == store.baselen+1 && !isalpha(key[i])))) {
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fprintf(stderr, "invalid key: %s\n", key);
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free(store.key);
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return 1;
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} else
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store.key[i] = tolower(key[i]);
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store.key[i] = 0;
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/*
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* The lock_file serves a purpose in addition to locking: the new
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* contents of .git/config will be written into it.
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*/
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fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
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if (fd < 0) {
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fprintf(stderr, "could not lock config file\n");
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free(store.key);
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return -1;
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}
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/*
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* If .git/config does not exist yet, write a minimal version.
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*/
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if (stat(config_filename, &st)) {
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static const char contents[] =
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"#\n"
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"# This is the config file\n"
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"#\n"
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"\n";
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free(store.key);
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/* if nothing to unset, error out */
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if (value == NULL) {
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close(fd);
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unlink(lock_file);
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return 5;
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}
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store.key = (char*)key;
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write(fd, contents, sizeof(contents)-1);
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store_write_section(fd, key);
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store_write_pair(fd, key, value);
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} else{
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int in_fd;
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char* contents;
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int i, copy_begin, copy_end, new_line = 0;
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if (value_regex == NULL)
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store.value_regex = NULL;
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else {
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if (value_regex[0] == '!') {
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store.do_not_match = 1;
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value_regex++;
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} else
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store.do_not_match = 0;
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store.value_regex = (regex_t*)malloc(sizeof(regex_t));
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if (regcomp(store.value_regex, value_regex,
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REG_EXTENDED)) {
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fprintf(stderr, "Invalid pattern: %s",
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value_regex);
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free(store.value_regex);
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return 6;
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}
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}
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store.offset[0] = 0;
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store.state = START;
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store.seen = 0;
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/*
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* After this, store.offset will contain the *end* offset
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* of the last match, or remain at 0 if no match was found.
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* As a side effect, we make sure to transform only a valid
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* existing config file.
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*/
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if (git_config(store_aux)) {
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fprintf(stderr, "invalid config file\n");
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free(store.key);
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if (store.value_regex != NULL) {
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regfree(store.value_regex);
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free(store.value_regex);
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}
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return 3;
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}
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free(store.key);
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if (store.value_regex != NULL) {
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regfree(store.value_regex);
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free(store.value_regex);
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}
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/* if nothing to unset, or too many matches, error out */
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if ((store.seen == 0 && value == NULL) ||
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(store.seen > 1 && multi_replace == 0)) {
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close(fd);
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unlink(lock_file);
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return 5;
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}
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in_fd = open(config_filename, O_RDONLY, 0666);
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contents = mmap(NULL, st.st_size, PROT_READ,
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MAP_PRIVATE, in_fd, 0);
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close(in_fd);
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if (store.seen == 0)
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store.seen = 1;
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for (i = 0, copy_begin = 0; i < store.seen; i++) {
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if (store.offset[i] == 0) {
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store.offset[i] = copy_end = st.st_size;
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} else if (store.state != KEY_SEEN) {
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copy_end = store.offset[i];
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} else
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copy_end = find_beginning_of_line(
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contents, st.st_size,
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store.offset[i]-2, &new_line);
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/* write the first part of the config */
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if (copy_end > copy_begin) {
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write(fd, contents + copy_begin,
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copy_end - copy_begin);
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if (new_line)
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write(fd, "\n", 1);
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}
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|
copy_begin = store.offset[i];
|
|
}
|
|
|
|
/* write the pair (value == NULL means unset) */
|
|
if (value != NULL) {
|
|
if (store.state == START)
|
|
store_write_section(fd, key);
|
|
store_write_pair(fd, key, value);
|
|
}
|
|
|
|
/* write the rest of the config */
|
|
if (copy_begin < st.st_size)
|
|
write(fd, contents + copy_begin,
|
|
st.st_size - copy_begin);
|
|
|
|
munmap(contents, st.st_size);
|
|
unlink(config_filename);
|
|
}
|
|
|
|
close(fd);
|
|
|
|
if (rename(lock_file, config_filename) < 0) {
|
|
fprintf(stderr, "Could not rename the lock file?\n");
|
|
return 4;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|