зеркало из https://github.com/microsoft/git.git
727 строки
15 KiB
C
727 строки
15 KiB
C
/*
|
|
* GIT - The information manager from hell
|
|
*
|
|
* Copyright (C) Linus Torvalds, 2005
|
|
* Copyright (C) Johannes Schindelin, 2005
|
|
*
|
|
*/
|
|
#include "cache.h"
|
|
#include <regex.h>
|
|
|
|
#define MAXNAME (256)
|
|
|
|
static FILE *config_file;
|
|
static const char *config_file_name;
|
|
static int config_linenr;
|
|
static int get_next_char(void)
|
|
{
|
|
int c;
|
|
FILE *f;
|
|
|
|
c = '\n';
|
|
if ((f = config_file) != NULL) {
|
|
c = fgetc(f);
|
|
if (c == '\r') {
|
|
/* DOS like systems */
|
|
c = fgetc(f);
|
|
if (c != '\n') {
|
|
ungetc(c, f);
|
|
c = '\r';
|
|
}
|
|
}
|
|
if (c == '\n')
|
|
config_linenr++;
|
|
if (c == EOF) {
|
|
config_file = NULL;
|
|
c = '\n';
|
|
}
|
|
}
|
|
return c;
|
|
}
|
|
|
|
static char *parse_value(void)
|
|
{
|
|
static char value[1024];
|
|
int quote = 0, comment = 0, len = 0, space = 0;
|
|
|
|
for (;;) {
|
|
int c = get_next_char();
|
|
if (len >= sizeof(value))
|
|
return NULL;
|
|
if (c == '\n') {
|
|
if (quote)
|
|
return NULL;
|
|
value[len] = 0;
|
|
return value;
|
|
}
|
|
if (comment)
|
|
continue;
|
|
if (isspace(c) && !quote) {
|
|
space = 1;
|
|
continue;
|
|
}
|
|
if (!quote) {
|
|
if (c == ';' || c == '#') {
|
|
comment = 1;
|
|
continue;
|
|
}
|
|
}
|
|
if (space) {
|
|
if (len)
|
|
value[len++] = ' ';
|
|
space = 0;
|
|
}
|
|
if (c == '\\') {
|
|
c = get_next_char();
|
|
switch (c) {
|
|
case '\n':
|
|
continue;
|
|
case 't':
|
|
c = '\t';
|
|
break;
|
|
case 'b':
|
|
c = '\b';
|
|
break;
|
|
case 'n':
|
|
c = '\n';
|
|
break;
|
|
/* Some characters escape as themselves */
|
|
case '\\': case '"':
|
|
break;
|
|
/* Reject unknown escape sequences */
|
|
default:
|
|
return NULL;
|
|
}
|
|
value[len++] = c;
|
|
continue;
|
|
}
|
|
if (c == '"') {
|
|
quote = 1-quote;
|
|
continue;
|
|
}
|
|
value[len++] = c;
|
|
}
|
|
}
|
|
|
|
static int get_value(config_fn_t fn, char *name, unsigned int len)
|
|
{
|
|
int c;
|
|
char *value;
|
|
|
|
/* Get the full name */
|
|
for (;;) {
|
|
c = get_next_char();
|
|
if (c == EOF)
|
|
break;
|
|
if (!isalnum(c))
|
|
break;
|
|
name[len++] = tolower(c);
|
|
if (len >= MAXNAME)
|
|
return -1;
|
|
}
|
|
name[len] = 0;
|
|
while (c == ' ' || c == '\t')
|
|
c = get_next_char();
|
|
|
|
value = NULL;
|
|
if (c != '\n') {
|
|
if (c != '=')
|
|
return -1;
|
|
value = parse_value();
|
|
if (!value)
|
|
return -1;
|
|
}
|
|
return fn(name, value);
|
|
}
|
|
|
|
static int get_extended_base_var(char *name, int baselen, int c)
|
|
{
|
|
do {
|
|
if (c == '\n')
|
|
return -1;
|
|
c = get_next_char();
|
|
} while (isspace(c));
|
|
|
|
/* We require the format to be '[base "extension"]' */
|
|
if (c != '"')
|
|
return -1;
|
|
name[baselen++] = '.';
|
|
|
|
for (;;) {
|
|
int c = get_next_char();
|
|
if (c == '\n')
|
|
return -1;
|
|
if (c == '"')
|
|
break;
|
|
if (c == '\\') {
|
|
c = get_next_char();
|
|
if (c == '\n')
|
|
return -1;
|
|
}
|
|
name[baselen++] = c;
|
|
if (baselen > MAXNAME / 2)
|
|
return -1;
|
|
}
|
|
|
|
/* Final ']' */
|
|
if (get_next_char() != ']')
|
|
return -1;
|
|
return baselen;
|
|
}
|
|
|
|
static int get_base_var(char *name)
|
|
{
|
|
int baselen = 0;
|
|
|
|
for (;;) {
|
|
int c = get_next_char();
|
|
if (c == EOF)
|
|
return -1;
|
|
if (c == ']')
|
|
return baselen;
|
|
if (isspace(c))
|
|
return get_extended_base_var(name, baselen, c);
|
|
if (!isalnum(c) && c != '.')
|
|
return -1;
|
|
if (baselen > MAXNAME / 2)
|
|
return -1;
|
|
name[baselen++] = tolower(c);
|
|
}
|
|
}
|
|
|
|
static int git_parse_file(config_fn_t fn)
|
|
{
|
|
int comment = 0;
|
|
int baselen = 0;
|
|
static char var[MAXNAME];
|
|
|
|
for (;;) {
|
|
int c = get_next_char();
|
|
if (c == '\n') {
|
|
/* EOF? */
|
|
if (!config_file)
|
|
return 0;
|
|
comment = 0;
|
|
continue;
|
|
}
|
|
if (comment || isspace(c))
|
|
continue;
|
|
if (c == '#' || c == ';') {
|
|
comment = 1;
|
|
continue;
|
|
}
|
|
if (c == '[') {
|
|
baselen = get_base_var(var);
|
|
if (baselen <= 0)
|
|
break;
|
|
var[baselen++] = '.';
|
|
var[baselen] = 0;
|
|
continue;
|
|
}
|
|
if (!isalpha(c))
|
|
break;
|
|
var[baselen] = tolower(c);
|
|
if (get_value(fn, var, baselen+1) < 0)
|
|
break;
|
|
}
|
|
die("bad config file line %d in %s", config_linenr, config_file_name);
|
|
}
|
|
|
|
int git_config_int(const char *name, const char *value)
|
|
{
|
|
if (value && *value) {
|
|
char *end;
|
|
int val = strtol(value, &end, 0);
|
|
if (!*end)
|
|
return val;
|
|
}
|
|
die("bad config value for '%s' in %s", name, config_file_name);
|
|
}
|
|
|
|
int git_config_bool(const char *name, const char *value)
|
|
{
|
|
if (!value)
|
|
return 1;
|
|
if (!*value)
|
|
return 0;
|
|
if (!strcasecmp(value, "true"))
|
|
return 1;
|
|
if (!strcasecmp(value, "false"))
|
|
return 0;
|
|
return git_config_int(name, value) != 0;
|
|
}
|
|
|
|
int git_default_config(const char *var, const char *value)
|
|
{
|
|
/* This needs a better name */
|
|
if (!strcmp(var, "core.filemode")) {
|
|
trust_executable_bit = git_config_bool(var, value);
|
|
return 0;
|
|
}
|
|
|
|
if (!strcmp(var, "core.ignorestat")) {
|
|
assume_unchanged = git_config_bool(var, value);
|
|
return 0;
|
|
}
|
|
|
|
if (!strcmp(var, "core.prefersymlinkrefs")) {
|
|
prefer_symlink_refs = git_config_bool(var, value);
|
|
return 0;
|
|
}
|
|
|
|
if (!strcmp(var, "core.logallrefupdates")) {
|
|
log_all_ref_updates = git_config_bool(var, value);
|
|
return 0;
|
|
}
|
|
|
|
if (!strcmp(var, "core.warnambiguousrefs")) {
|
|
warn_ambiguous_refs = git_config_bool(var, value);
|
|
return 0;
|
|
}
|
|
|
|
if (!strcmp(var, "user.name")) {
|
|
strlcpy(git_default_name, value, sizeof(git_default_name));
|
|
return 0;
|
|
}
|
|
|
|
if (!strcmp(var, "user.email")) {
|
|
strlcpy(git_default_email, value, sizeof(git_default_email));
|
|
return 0;
|
|
}
|
|
|
|
if (!strcmp(var, "i18n.commitencoding")) {
|
|
strlcpy(git_commit_encoding, value, sizeof(git_commit_encoding));
|
|
return 0;
|
|
}
|
|
|
|
/* Add other config variables here and to Documentation/config.txt. */
|
|
return 0;
|
|
}
|
|
|
|
int git_config_from_file(config_fn_t fn, const char *filename)
|
|
{
|
|
int ret;
|
|
FILE *f = fopen(filename, "r");
|
|
|
|
ret = -1;
|
|
if (f) {
|
|
config_file = f;
|
|
config_file_name = filename;
|
|
config_linenr = 1;
|
|
ret = git_parse_file(fn);
|
|
fclose(f);
|
|
config_file_name = NULL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int git_config(config_fn_t fn)
|
|
{
|
|
int ret = 0;
|
|
char *repo_config = NULL;
|
|
const char *home = NULL, *filename;
|
|
|
|
/* $GIT_CONFIG makes git read _only_ the given config file,
|
|
* $GIT_CONFIG_LOCAL will make it process it in addition to the
|
|
* global config file, the same way it would the per-repository
|
|
* config file otherwise. */
|
|
filename = getenv("GIT_CONFIG");
|
|
if (!filename) {
|
|
home = getenv("HOME");
|
|
filename = getenv("GIT_CONFIG_LOCAL");
|
|
if (!filename)
|
|
filename = repo_config = strdup(git_path("config"));
|
|
}
|
|
|
|
if (home) {
|
|
char *user_config = strdup(mkpath("%s/.gitconfig", home));
|
|
if (!access(user_config, R_OK))
|
|
ret = git_config_from_file(fn, user_config);
|
|
free(user_config);
|
|
}
|
|
|
|
ret += git_config_from_file(fn, filename);
|
|
if (repo_config)
|
|
free(repo_config);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Find all the stuff for git_config_set() below.
|
|
*/
|
|
|
|
#define MAX_MATCHES 512
|
|
|
|
static struct {
|
|
int baselen;
|
|
char* key;
|
|
int do_not_match;
|
|
regex_t* value_regex;
|
|
int multi_replace;
|
|
off_t offset[MAX_MATCHES];
|
|
enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
|
|
int seen;
|
|
} store;
|
|
|
|
static int matches(const char* key, const char* value)
|
|
{
|
|
return !strcmp(key, store.key) &&
|
|
(store.value_regex == NULL ||
|
|
(store.do_not_match ^
|
|
!regexec(store.value_regex, value, 0, NULL, 0)));
|
|
}
|
|
|
|
static int store_aux(const char* key, const char* value)
|
|
{
|
|
switch (store.state) {
|
|
case KEY_SEEN:
|
|
if (matches(key, value)) {
|
|
if (store.seen == 1 && store.multi_replace == 0) {
|
|
fprintf(stderr,
|
|
"Warning: %s has multiple values\n",
|
|
key);
|
|
} else if (store.seen >= MAX_MATCHES) {
|
|
fprintf(stderr, "Too many matches\n");
|
|
return 1;
|
|
}
|
|
|
|
store.offset[store.seen] = ftell(config_file);
|
|
store.seen++;
|
|
}
|
|
break;
|
|
case SECTION_SEEN:
|
|
if (strncmp(key, store.key, store.baselen+1)) {
|
|
store.state = SECTION_END_SEEN;
|
|
break;
|
|
} else
|
|
/* do not increment matches: this is no match */
|
|
store.offset[store.seen] = ftell(config_file);
|
|
/* fallthru */
|
|
case SECTION_END_SEEN:
|
|
case START:
|
|
if (matches(key, value)) {
|
|
store.offset[store.seen] = ftell(config_file);
|
|
store.state = KEY_SEEN;
|
|
store.seen++;
|
|
} else {
|
|
if (strrchr(key, '.') - key == store.baselen &&
|
|
!strncmp(key, store.key, store.baselen)) {
|
|
store.state = SECTION_SEEN;
|
|
store.offset[store.seen] = ftell(config_file);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void store_write_section(int fd, const char* key)
|
|
{
|
|
const char *dot = strchr(key, '.');
|
|
int len1 = store.baselen, len2 = -1;
|
|
|
|
dot = strchr(key, '.');
|
|
if (dot) {
|
|
int dotlen = dot - key;
|
|
if (dotlen < len1) {
|
|
len2 = len1 - dotlen - 1;
|
|
len1 = dotlen;
|
|
}
|
|
}
|
|
|
|
write(fd, "[", 1);
|
|
write(fd, key, len1);
|
|
if (len2 >= 0) {
|
|
write(fd, " \"", 2);
|
|
while (--len2 >= 0) {
|
|
unsigned char c = *++dot;
|
|
if (c == '"')
|
|
write(fd, "\\", 1);
|
|
write(fd, &c, 1);
|
|
}
|
|
write(fd, "\"", 1);
|
|
}
|
|
write(fd, "]\n", 2);
|
|
}
|
|
|
|
static void store_write_pair(int fd, const char* key, const char* value)
|
|
{
|
|
int i;
|
|
|
|
write(fd, "\t", 1);
|
|
write(fd, key+store.baselen+1,
|
|
strlen(key+store.baselen+1));
|
|
write(fd, " = ", 3);
|
|
for (i = 0; value[i]; i++)
|
|
switch (value[i]) {
|
|
case '\n': write(fd, "\\n", 2); break;
|
|
case '\t': write(fd, "\\t", 2); break;
|
|
case '"': case '\\': write(fd, "\\", 1);
|
|
default: write(fd, value+i, 1);
|
|
}
|
|
write(fd, "\n", 1);
|
|
}
|
|
|
|
static int find_beginning_of_line(const char* contents, int size,
|
|
int offset_, int* found_bracket)
|
|
{
|
|
int equal_offset = size, bracket_offset = size;
|
|
int offset;
|
|
|
|
for (offset = offset_-2; offset > 0
|
|
&& contents[offset] != '\n'; offset--)
|
|
switch (contents[offset]) {
|
|
case '=': equal_offset = offset; break;
|
|
case ']': bracket_offset = offset; break;
|
|
}
|
|
if (bracket_offset < equal_offset) {
|
|
*found_bracket = 1;
|
|
offset = bracket_offset+1;
|
|
} else
|
|
offset++;
|
|
|
|
return offset;
|
|
}
|
|
|
|
int git_config_set(const char* key, const char* value)
|
|
{
|
|
return git_config_set_multivar(key, value, NULL, 0);
|
|
}
|
|
|
|
/*
|
|
* If value==NULL, unset in (remove from) config,
|
|
* if value_regex!=NULL, disregard key/value pairs where value does not match.
|
|
* if multi_replace==0, nothing, or only one matching key/value is replaced,
|
|
* else all matching key/values (regardless how many) are removed,
|
|
* before the new pair is written.
|
|
*
|
|
* Returns 0 on success.
|
|
*
|
|
* This function does this:
|
|
*
|
|
* - it locks the config file by creating ".git/config.lock"
|
|
*
|
|
* - it then parses the config using store_aux() as validator to find
|
|
* the position on the key/value pair to replace. If it is to be unset,
|
|
* it must be found exactly once.
|
|
*
|
|
* - the config file is mmap()ed and the part before the match (if any) is
|
|
* written to the lock file, then the changed part and the rest.
|
|
*
|
|
* - the config file is removed and the lock file rename()d to it.
|
|
*
|
|
*/
|
|
int git_config_set_multivar(const char* key, const char* value,
|
|
const char* value_regex, int multi_replace)
|
|
{
|
|
int i, dot;
|
|
int fd = -1, in_fd;
|
|
int ret;
|
|
char* config_filename;
|
|
char* lock_file;
|
|
const char* last_dot = strrchr(key, '.');
|
|
|
|
config_filename = getenv("GIT_CONFIG");
|
|
if (!config_filename) {
|
|
config_filename = getenv("GIT_CONFIG_LOCAL");
|
|
if (!config_filename)
|
|
config_filename = git_path("config");
|
|
}
|
|
config_filename = strdup(config_filename);
|
|
lock_file = strdup(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 = (char*)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 (!isalnum(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);
|
|
}
|
|
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;
|
|
store_write_section(fd, key);
|
|
store_write_pair(fd, key, value);
|
|
} 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*)malloc(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 = mmap(NULL, st.st_size, PROT_READ,
|
|
MAP_PRIVATE, in_fd, 0);
|
|
close(in_fd);
|
|
|
|
if (store.seen == 0)
|
|
store.seen = 1;
|
|
|
|
for (i = 0, copy_begin = 0; i < store.seen; i++) {
|
|
if (store.offset[i] == 0) {
|
|
store.offset[i] = copy_end = st.st_size;
|
|
} else if (store.state != KEY_SEEN) {
|
|
copy_end = store.offset[i];
|
|
} else
|
|
copy_end = find_beginning_of_line(
|
|
contents, st.st_size,
|
|
store.offset[i]-2, &new_line);
|
|
|
|
/* write the first part of the config */
|
|
if (copy_end > copy_begin) {
|
|
write(fd, contents + copy_begin,
|
|
copy_end - copy_begin);
|
|
if (new_line)
|
|
write(fd, "\n", 1);
|
|
}
|
|
copy_begin = store.offset[i];
|
|
}
|
|
|
|
/* write the pair (value == NULL means unset) */
|
|
if (value != NULL) {
|
|
if (store.state == START)
|
|
store_write_section(fd, key);
|
|
store_write_pair(fd, key, value);
|
|
}
|
|
|
|
/* write the rest of the config */
|
|
if (copy_begin < st.st_size)
|
|
write(fd, contents + copy_begin,
|
|
st.st_size - copy_begin);
|
|
|
|
munmap(contents, st.st_size);
|
|
unlink(config_filename);
|
|
}
|
|
|
|
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);
|
|
if (config_filename)
|
|
free(config_filename);
|
|
if (lock_file) {
|
|
unlink(lock_file);
|
|
free(lock_file);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|