git/config.c at master · AdminYF/git

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* GIT - The information manager from hell

* Copyright (C) Linus Torvalds, 2005

* Copyright (C) Johannes Schindelin, 2005

#include "cache.h"

#include "lockfile.h"

#include "exec_cmd.h"

#include "strbuf.h"

#include "quote.h"

#include "hashmap.h"

#include "string-list.h"

#include "utf8.h"

struct config_source {

struct config_source *prev;

union {

FILE *file;

struct config_buf {

const char *buf;

size_t len;

size_t pos;

} buf;

} u;

enum config_origin_type origin_type;

const char *name;

const char *path;

int die_on_error;

int linenr;

int eof;

struct strbuf value;

struct strbuf var;

int (*do_fgetc)(struct config_source *c);

int (*do_ungetc)(int c, struct config_source *conf);

long (*do_ftell)(struct config_source *c);

};

* These variables record the "current" config source, which

* can be accessed by parsing callbacks.

* The "cf" variable will be non-NULL only when we are actually parsing a real

* config source (file, blob, cmdline, etc).

* The "current_config_kvi" variable will be non-NULL only when we are feeding

* cached config from a configset into a callback.

* They should generally never be non-NULL at the same time. If they are both

* NULL, then we aren't parsing anything (and depending on the function looking

* at the variables, it's either a bug for it to be called in the first place,

* or it's a function which can be reused for non-config purposes, and should

* fall back to some sane behavior).

static struct config_source *cf;

static struct key_value_info *current_config_kvi;

* Similar to the variables above, this gives access to the "scope" of the

* current value (repo, global, etc). For cached values, it can be found via

* the current_config_kvi as above. During parsing, the current value can be

* found in this variable. It's not part of "cf" because it transcends a single

* file (i.e., a file included from .git/config is still in "repo" scope).

static enum config_scope current_parsing_scope;

static int zlib_compression_seen;

* Default config_set that contains key-value pairs from the usual set of config

* config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG

* config file and the global /etc/gitconfig)

static struct config_set the_config_set;

static int config_file_fgetc(struct config_source *conf)

{

return getc_unlocked(conf->u.file);

}

static int config_file_ungetc(int c, struct config_source *conf)

{

return ungetc(c, conf->u.file);

}

static long config_file_ftell(struct config_source *conf)

{

return ftell(conf->u.file);

}

static int config_buf_fgetc(struct config_source *conf)

{

if (conf->u.buf.pos < conf->u.buf.len)

return conf->u.buf.buf[conf->u.buf.pos++];

return EOF;

}

static int config_buf_ungetc(int c, struct config_source *conf)

{

if (conf->u.buf.pos > 0) {

conf->u.buf.pos--;

if (conf->u.buf.buf[conf->u.buf.pos] != c)

die("BUG: config_buf can only ungetc the same character");

return c;

}

return EOF;

}

static long config_buf_ftell(struct config_source *conf)

{

return conf->u.buf.pos;

}

#define MAX_INCLUDE_DEPTH 10

static const char include_depth_advice[] =

"exceeded maximum include depth (%d) while including\n"

" %s\n"

"from\n"

" %s\n"

"Do you have circular includes?";

static int handle_path_include(const char *path, struct config_include_data *inc)

{

int ret = 0;

struct strbuf buf = STRBUF_INIT;

char *expanded;

if (!path)

return config_error_nonbool("include.path");

expanded = expand_user_path(path);

if (!expanded)

return error("could not expand include path '%s'", path);

path = expanded;

* Use an absolute path as-is, but interpret relative paths

* based on the including config file.

if (!is_absolute_path(path)) {

char *slash;

if (!cf || !cf->path)

return error("relative config includes must come from files");

slash = find_last_dir_sep(cf->path);

if (slash)

strbuf_add(&buf, cf->path, slash - cf->path + 1);

strbuf_addstr(&buf, path);

path = buf.buf;

}

if (!access_or_die(path, R_OK, 0)) {

if (++inc->depth > MAX_INCLUDE_DEPTH)

die(include_depth_advice, MAX_INCLUDE_DEPTH, path,

!cf ? "<unknown>" :

cf->name ? cf->name :

"the command line");

ret = git_config_from_file(git_config_include, path, inc);

inc->depth--;

}

strbuf_release(&buf);

free(expanded);

return ret;

}

int git_config_include(const char *var, const char *value, void *data)

{

struct config_include_data *inc = data;

int ret;

* Pass along all values, including "include" directives; this makes it

* possible to query information on the includes themselves.

ret = inc->fn(var, value, inc->data);

if (ret < 0)

return ret;

if (!strcmp(var, "include.path"))

ret = handle_path_include(value, inc);

return ret;

}

void git_config_push_parameter(const char *text)

{

struct strbuf env = STRBUF_INIT;

const char *old = getenv(CONFIG_DATA_ENVIRONMENT);

if (old && *old) {

strbuf_addstr(&env, old);

strbuf_addch(&env, ' ');

}

sq_quote_buf(&env, text);

setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);

strbuf_release(&env);

}

int git_config_parse_parameter(const char *text,

config_fn_t fn, void *data)

{

const char *value;

struct strbuf **pair;

pair = strbuf_split_str(text, '=', 2);

if (!pair[0])

return error("bogus config parameter: %s", text);

if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {

strbuf_setlen(pair[0], pair[0]->len - 1);

value = pair[1] ? pair[1]->buf : "";

} else {

value = NULL;

}

strbuf_trim(pair[0]);

if (!pair[0]->len) {

strbuf_list_free(pair);

return error("bogus config parameter: %s", text);

}

strbuf_tolower(pair[0]);

if (fn(pair[0]->buf, value, data) < 0) {

strbuf_list_free(pair);

return -1;

}

strbuf_list_free(pair);

return 0;

}

int git_config_from_parameters(config_fn_t fn, void *data)

{

const char *env = getenv(CONFIG_DATA_ENVIRONMENT);

int ret = 0;

char *envw;

const char **argv = NULL;

int nr = 0, alloc = 0;

int i;

struct config_source source;

if (!env)

return 0;

memset(&source, 0, sizeof(source));

source.prev = cf;

source.origin_type = CONFIG_ORIGIN_CMDLINE;

cf = &source;

/* sq_dequote will write over it */

envw = xstrdup(env);

if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {

ret = error("bogus format in " CONFIG_DATA_ENVIRONMENT);

goto out;

}

for (i = 0; i < nr; i++) {

if (git_config_parse_parameter(argv[i], fn, data) < 0) {

ret = -1;

goto out;

}

out:

free(argv);

free(envw);

cf = source.prev;

return ret;

}

static int get_next_char(void)

{

int c = cf->do_fgetc(cf);

if (c == '\r') {

/* DOS like systems */

c = cf->do_fgetc(cf);

if (c != '\n') {

if (c != EOF)

cf->do_ungetc(c, cf);

c = '\r';

}

if (c == '\n')

cf->linenr++;

if (c == EOF) {

cf->eof = 1;

cf->linenr++;

c = '\n';

}

return c;

}

static char *parse_value(void)

{

int quote = 0, comment = 0, space = 0;

strbuf_reset(&cf->value);

for (;;) {

int c = get_next_char();

if (c == '\n') {

if (quote) {

cf->linenr--;

return NULL;

}

return cf->value.buf;

}

if (comment)

continue;

if (isspace(c) && !quote) {

if (cf->value.len)

space++;

continue;

}

if (!quote) {

if (c == ';' || c == '#') {

comment = 1;

continue;

}

for (; space; space--)

strbuf_addch(&cf->value, ' ');

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;

}

strbuf_addch(&cf->value, c);

continue;

}

if (c == '"') {

quote = 1-quote;

continue;

}

strbuf_addch(&cf->value, c);

}

static inline int iskeychar(int c)

{

return isalnum(c) || c == '-';

}

static int get_value(config_fn_t fn, void *data, struct strbuf *name)

{

int c;

char *value;

int ret;

/* Get the full name */

for (;;) {

c = get_next_char();

if (cf->eof)

break;

if (!iskeychar(c))

break;

strbuf_addch(name, tolower(c));

}

while (c == ' ' || c == '\t')

c = get_next_char();

value = NULL;

if (c != '\n') {

if (c != '=')

return -1;

value = parse_value();

if (!value)

return -1;

}

* We already consumed the \n, but we need linenr to point to

* the line we just parsed during the call to fn to get

* accurate line number in error messages.

cf->linenr--;

ret = fn(name->buf, value, data);

cf->linenr++;

return ret;

}

static int get_extended_base_var(struct strbuf *name, int c)

{

do {

if (c == '\n')

goto error_incomplete_line;

c = get_next_char();

} while (isspace(c));

/* We require the format to be '[base "extension"]' */

if (c != '"')

return -1;

strbuf_addch(name, '.');

for (;;) {

int c = get_next_char();

if (c == '\n')

goto error_incomplete_line;

if (c == '"')

break;

if (c == '\\') {

c = get_next_char();

if (c == '\n')

goto error_incomplete_line;

}

strbuf_addch(name, c);

}

/* Final ']' */

if (get_next_char() != ']')

return -1;

return 0;

error_incomplete_line:

cf->linenr--;

return -1;

}

static int get_base_var(struct strbuf *name)

{

for (;;) {

int c = get_next_char();

if (cf->eof)

return -1;

if (c == ']')

return 0;

if (isspace(c))

return get_extended_base_var(name, c);

if (!iskeychar(c) && c != '.')

return -1;

strbuf_addch(name, tolower(c));

}

static int git_parse_source(config_fn_t fn, void *data)

{

int comment = 0;

int baselen = 0;

struct strbuf *var = &cf->var;

int error_return = 0;

char *error_msg = NULL;

/* U+FEFF Byte Order Mark in UTF8 */

const char *bomptr = utf8_bom;

for (;;) {

int c = get_next_char();

if (bomptr && *bomptr) {

/* We are at the file beginning; skip UTF8-encoded BOM

* if present. Sane editors won't put this in on their

* own, but e.g. Windows Notepad will do it happily. */

if (c == (*bomptr & 0377)) {

bomptr++;

continue;

} else {

/* Do not tolerate partial BOM. */

if (bomptr != utf8_bom)

break;

/* No BOM at file beginning. Cool. */

bomptr = NULL;

}

if (c == '\n') {

if (cf->eof)

return 0;

comment = 0;

continue;

}

if (comment || isspace(c))

continue;

if (c == '#' || c == ';') {

comment = 1;

continue;

}

if (c == '[') {

/* Reset prior to determining a new stem */

strbuf_reset(var);

if (get_base_var(var) < 0 || var->len < 1)

break;

strbuf_addch(var, '.');

baselen = var->len;

continue;

}

if (!isalpha(c))

break;

* Truncate the var name back to the section header

* stem prior to grabbing the suffix part of the name

* and the value.

strbuf_setlen(var, baselen);

strbuf_addch(var, tolower(c));

if (get_value(fn, data, var) < 0)

break;

}

switch (cf->origin_type) {

case CONFIG_ORIGIN_BLOB:

error_msg = xstrfmt(_("bad config line %d in blob %s"),

cf->linenr, cf->name);

break;

case CONFIG_ORIGIN_FILE:

error_msg = xstrfmt(_("bad config line %d in file %s"),

cf->linenr, cf->name);

break;

case CONFIG_ORIGIN_STDIN:

error_msg = xstrfmt(_("bad config line %d in standard input"),

cf->linenr);

break;

case CONFIG_ORIGIN_SUBMODULE_BLOB:

error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),

cf->linenr, cf->name);

break;

case CONFIG_ORIGIN_CMDLINE:

error_msg = xstrfmt(_("bad config line %d in command line %s"),

cf->linenr, cf->name);

break;

default:

error_msg = xstrfmt(_("bad config line %d in %s"),

cf->linenr, cf->name);

}

if (cf->die_on_error)

die("%s", error_msg);

else

error_return = error("%s", error_msg);

free(error_msg);

return error_return;

}

static int parse_unit_factor(const char *end, uintmax_t *val)

{

if (!*end)

return 1;

else if (!strcasecmp(end, "k")) {

*val *= 1024;

return 1;

}

else if (!strcasecmp(end, "m")) {

*val *= 1024 * 1024;

return 1;

}

else if (!strcasecmp(end, "g")) {

*val *= 1024 * 1024 * 1024;

return 1;

}

return 0;

}

static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)

{

if (value && *value) {

char *end;

intmax_t val;

uintmax_t uval;

uintmax_t factor = 1;

errno = 0;

val = strtoimax(value, &end, 0);

if (errno == ERANGE)

return 0;

if (!parse_unit_factor(end, &factor)) {

errno = EINVAL;

return 0;

}

uval = labs(val);

uval *= factor;

if (uval > max || labs(val) > uval) {

errno = ERANGE;

return 0;

}

val *= factor;

*ret = val;

return 1;

}

errno = EINVAL;

return 0;

}

static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)

{

if (value && *value) {

char *end;

uintmax_t val;

uintmax_t oldval;

errno = 0;

val = strtoumax(value, &end, 0);

if (errno == ERANGE)

return 0;

oldval = val;

if (!parse_unit_factor(end, &val)) {

errno = EINVAL;

return 0;

}

if (val > max || oldval > val) {

errno = ERANGE;

return 0;

}

*ret = val;

return 1;

}

errno = EINVAL;

return 0;

}

static int git_parse_int(const char *value, int *ret)

{

intmax_t tmp;

if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))

return 0;

*ret = tmp;

return 1;

}

static int git_parse_int64(const char *value, int64_t *ret)

{

intmax_t tmp;

if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))

return 0;

*ret = tmp;

return 1;

}

int git_parse_ulong(const char *value, unsigned long *ret)

{

uintmax_t tmp;

if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))

return 0;

*ret = tmp;

return 1;

}

NORETURN

static void die_bad_number(const char *name, const char *value)

{

const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");

if (!value)

value = "";

if (!(cf && cf->name))

die(_("bad numeric config value '%s' for '%s': %s"),

value, name, error_type);

switch (cf->origin_type) {

case CONFIG_ORIGIN_BLOB:

die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),