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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
* Copyright (C) Johannes Schindelin, 2005
*
*/
#include "cache.h"
#include "exec_cmd.h"
#include "strbuf.h"
#include "quote.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;
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);
};

static struct config_source *cf;

static int zlib_compression_seen;

static int config_file_fgetc(struct config_source *conf)
{
return fgetc(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)
return conf->u.buf.buf[--conf->u.buf.pos];

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 && 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;
const char *type;
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;

type = skip_prefix(var, "include.");
if (!type)
return ret;

if (!strcmp(type, "path"))
ret = handle_path_include(value, inc);
return ret;
}

static void lowercase(char *p)
{
for (; *p; p++)
*p = tolower(*p);
}

void git_config_push_parameter(const char *text)
{
struct strbuf env = STRBUF_INIT;
const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
if (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)
{
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);
strbuf_trim(pair[0]);
if (!pair[0]->len) {
strbuf_list_free(pair);
return error("bogus config parameter: %s", text);
}
lowercase(pair[0]->buf);
if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, 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);
char *envw;
const char **argv = NULL;
int nr = 0, alloc = 0;
int i;

if (!env)
return 0;
/* sq_dequote will write over it */
envw = xstrdup(env);

if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
free(envw);
return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
}

for (i = 0; i < nr; i++) {
if (git_config_parse_parameter(argv[i], fn, data) < 0) {
free(argv);
free(envw);
return -1;
}
}

free(argv);
free(envw);
return nr > 0;
}

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') {
cf->do_ungetc(c, cf);
c = '\r';
}
}
if (c == '\n')
cf->linenr++;
if (c == EOF) {
cf->eof = 1;
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;

/* 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;
}
return fn(name->buf, value, data);
}

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;

/* U+FEFF Byte Order Mark in UTF8 */
static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
const unsigned 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 ((unsigned char) c == *bomptr) {
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;
}
if (cf->die_on_error)
die("bad config file line %d in %s", cf->linenr, cf->name);
else
return error("bad config file line %d in %s", cf->linenr, cf->name);
}

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 = abs(val);
uval *= factor;
if (uval > max || abs(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 *reason = errno == ERANGE ?
"out of range" :
"invalid unit";
if (!value)
value = "";

if (cf && cf->name)
die("bad numeric config value '%s' for '%s' in %s: %s",
value, name, cf->name, reason);
die("bad numeric config value '%s' for '%s': %s", value, name, reason);
}

int git_config_int(const char *name, const char *value)
{
int ret;
if (!git_parse_int(value, &ret))
die_bad_number(name, value);
return ret;
}

int64_t git_config_int64(const char *name, const char *value)
{
int64_t ret;
if (!git_parse_int64(value, &ret))
die_bad_number(name, value);
return ret;
}

unsigned long git_config_ulong(const char *name, const char *value)
{
unsigned long ret;
if (!git_parse_ulong(value, &ret))
die_bad_number(name, value);
return ret;
}

static int git_config_maybe_bool_text(const char *name, const char *value)
{
if (!value)
return 1;
if (!*value)
return 0;
if (!strcasecmp(value, "true")
|| !strcasecmp(value, "yes")
|| !strcasecmp(value, "on"))
return 1;
if (!strcasecmp(value, "false")
|| !strcasecmp(value, "no")
|| !strcasecmp(value, "off"))
return 0;
return -1;
}

int git_config_maybe_bool(const char *name, const char *value)
{
int v = git_config_maybe_bool_text(name, value);
if (0 <= v)
return v;
if (git_parse_int(value, &v))
return !!v;
return -1;
}

int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
{
int v = git_config_maybe_bool_text(name, value);
if (0 <= v) {
*is_bool = 1;
return v;
}
*is_bool = 0;
return git_config_int(name, value);
}

int git_config_bool(const char *name, const char *value)
{
int discard;
return !!git_config_bool_or_int(name, value, &discard);
}

int git_config_string(const char **dest, const char *var, const char *value)
{
if (!value)
return config_error_nonbool(var);
*dest = xstrdup(value);
return 0;
}

int git_config_pathname(const char **dest, const char *var, const char *value)
{
if (!value)
return config_error_nonbool(var);
*dest = expand_user_path(value);
if (!*dest)
die("Failed to expand user dir in: '%s'", value);
return 0;
}

static int git_default_core_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.trustctime")) {
trust_ctime = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "core.checkstat")) {
if (!strcasecmp(value, "default"))
check_stat = 1;
else if (!strcasecmp(value, "minimal"))
check_stat = 0;
}

if (!strcmp(var, "core.quotepath")) {
quote_path_fully = git_config_bool(var, value);
return 0;
}

if (!strcmp(var, "core.symlinks")) {
has_symlinks = git_config_bool(var, value);
return 0;
}

if (!strcmp(var, "core.ignorecase")) {
ignore_case = git_config_bool(var, value);
return 0;
}

if (!strcmp(var, "core.attributesfile"))
return git_config_pathname(&git_attributes_file, var, value);

if (!strcmp(var, "core.bare")) {
is_bare_repository_cfg = 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, "core.abbrev")) {
int abbrev = git_config_int(var, value);
if (abbrev < minimum_abbrev || abbrev > 40)
return -1;
default_abbrev = abbrev;
return 0;
}

if (!strcmp(var, "core.loosecompression")) {
int level = git_config_int(var, value);
if (level == -1)
level = Z_DEFAULT_COMPRESSION;
else if (level < 0 || level > Z_BEST_COMPRESSION)
die("bad zlib compression level %d", level);
zlib_compression_level = level;
zlib_compression_seen = 1;
return 0;
}

if (!strcmp(var, "core.compression")) {
int level = git_config_int(var, value);
if (level == -1)
level = Z_DEFAULT_COMPRESSION;
else if (level < 0 || level > Z_BEST_COMPRESSION)
die("bad zlib compression level %d", level);
core_compression_level = level;
core_compression_seen = 1;
if (!zlib_compression_seen)
zlib_compression_level = level;
return 0;
}

if (!strcmp(var, "core.packedgitwindowsize")) {
int pgsz_x2 = getpagesize() * 2;
packed_git_window_size = git_config_ulong(var, value);

/* This value must be multiple of (pagesize * 2) */
packed_git_window_size /= pgsz_x2;
if (packed_git_window_size < 1)
packed_git_window_size = 1;
packed_git_window_size *= pgsz_x2;
return 0;
}

if (!strcmp(var, "core.bigfilethreshold")) {
big_file_threshold = git_config_ulong(var, value);
return 0;
}

if (!strcmp(var, "core.packedgitlimit")) {
packed_git_limit = git_config_ulong(var, value);
return 0;
}

if (!strcmp(var, "core.deltabasecachelimit")) {
delta_base_cache_limit = git_config_ulong(var, value);
return 0;
}

if (!strcmp(var, "core.autocrlf")) {
if (value && !strcasecmp(value, "input")) {
if (core_eol == EOL_CRLF)
return error("core.autocrlf=input conflicts with core.eol=crlf");
auto_crlf = AUTO_CRLF_INPUT;
return 0;
}
auto_crlf = git_config_bool(var, value);
return 0;
}

if (!strcmp(var, "core.safecrlf")) {
if (value && !strcasecmp(value, "warn")) {
safe_crlf = SAFE_CRLF_WARN;
return 0;
}
safe_crlf = git_config_bool(var, value);
return 0;
}

if (!strcmp(var, "core.eol")) {
if (value && !strcasecmp(value, "lf"))
core_eol = EOL_LF;
else if (value && !strcasecmp(value, "crlf"))
core_eol = EOL_CRLF;
else if (value && !strcasecmp(value, "native"))
core_eol = EOL_NATIVE;
else
core_eol = EOL_UNSET;
if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
return error("core.autocrlf=input conflicts with core.eol=crlf");
return 0;
}

if (!strcmp(var, "core.notesref")) {
notes_ref_name = xstrdup(value);
return 0;
}

if (!strcmp(var, "core.pager"))
return git_config_string(&pager_program, var, value);

if (!strcmp(var, "core.editor"))
return git_config_string(&editor_program, var, value);

if (!strcmp(var, "core.commentchar")) {
const char *comment;
int ret = git_config_string(&comment, var, value);
if (!ret)
comment_line_char = comment[0];
return ret;
}

if (!strcmp(var, "core.askpass"))
return git_config_string(&askpass_program, var, value);

if (!strcmp(var, "core.excludesfile"))
return git_config_pathname(&excludes_file, var, value);

if (!strcmp(var, "core.whitespace")) {
if (!value)
return config_error_nonbool(var);
whitespace_rule_cfg = parse_whitespace_rule(value);
return 0;
}

if (!strcmp(var, "core.fsyncobjectfiles")) {
fsync_object_files = git_config_bool(var, value);
return 0;
}

if (!strcmp(var, "core.preloadindex")) {
core_preload_index = git_config_bool(var, value);
return 0;
}

if (!strcmp(var, "core.createobject")) {
if (!strcmp(value, "rename"))
object_creation_mode = OBJECT_CREATION_USES_RENAMES;
else if (!strcmp(value, "link"))
object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
else
die("Invalid mode for object creation: %s", value);
return 0;
}

if (!strcmp(var, "core.sparsecheckout")) {
core_apply_sparse_checkout = git_config_bool(var, value);
return 0;
}

if (!strcmp(var, "core.precomposeunicode")) {
precomposed_unicode = git_config_bool(var, value);
return 0;
}

/* Add other config variables here and to Documentation/config.txt. */
return 0;
}

static int git_default_i18n_config(const char *var, const char *value)
{
if (!strcmp(var, "i18n.commitencoding"))
return git_config_string(&git_commit_encoding, var, value);

if (!strcmp(var, "i18n.logoutputencoding"))
return git_config_string(&git_log_output_encoding, var, value);

/* Add other config variables here and to Documentation/config.txt. */
return 0;
}

static int git_default_branch_config(const char *var, const char *value)
{
if (!strcmp(var, "branch.autosetupmerge")) {
if (value && !strcasecmp(value, "always")) {
git_branch_track = BRANCH_TRACK_ALWAYS;
return 0;
}
git_branch_track = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "branch.autosetuprebase")) {
if (!value)
return config_error_nonbool(var);
else if (!strcmp(value, "never"))
autorebase = AUTOREBASE_NEVER;
else if (!strcmp(value, "local"))
autorebase = AUTOREBASE_LOCAL;
else if (!strcmp(value, "remote"))
autorebase = AUTOREBASE_REMOTE;
else if (!strcmp(value, "always"))
autorebase = AUTOREBASE_ALWAYS;
else
return error("Malformed value for %s", var);
return 0;
}

/* Add other config variables here and to Documentation/config.txt. */
return 0;
}

static int git_default_push_config(const char *var, const char *value)
{
if (!strcmp(var, "push.default")) {
if (!value)
return config_error_nonbool(var);
else if (!strcmp(value, "nothing"))
push_default = PUSH_DEFAULT_NOTHING;
else if (!strcmp(value, "matching"))
push_default = PUSH_DEFAULT_MATCHING;
else if (!strcmp(value, "simple"))
push_default = PUSH_DEFAULT_SIMPLE;
else if (!strcmp(value, "upstream"))
push_default = PUSH_DEFAULT_UPSTREAM;
else if (!strcmp(value, "tracking")) /* deprecated */
push_default = PUSH_DEFAULT_UPSTREAM;
else if (!strcmp(value, "current"))
push_default = PUSH_DEFAULT_CURRENT;
else {
error("Malformed value for %s: %s", var, value);
return error("Must be one of nothing, matching, simple, "
"upstream or current.");
}
return 0;
}

/* Add other config variables here and to Documentation/config.txt. */
return 0;
}

static int git_default_mailmap_config(const char *var, const char *value)
{
if (!strcmp(var, "mailmap.file"))
return git_config_string(&git_mailmap_file, var, value);
if (!strcmp(var, "mailmap.blob"))
return git_config_string(&git_mailmap_blob, var, value);

/* Add other config variables here and to Documentation/config.txt. */
return 0;
}

int git_default_config(const char *var, const char *value, void *dummy)
{
if (starts_with(var, "core."))
return git_default_core_config(var, value);

if (starts_with(var, "user."))
return git_ident_config(var, value, dummy);

if (starts_with(var, "i18n."))
return git_default_i18n_config(var, value);

if (starts_with(var, "branch."))
return git_default_branch_config(var, value);

if (starts_with(var, "push."))
return git_default_push_config(var, value);

if (starts_with(var, "mailmap."))
return git_default_mailmap_config(var, value);

if (starts_with(var, "advice."))
return git_default_advice_config(var, value);

if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
pager_use_color = git_config_bool(var,value);
return 0;
}

if (!strcmp(var, "pack.packsizelimit")) {
pack_size_limit_cfg = git_config_ulong(var, value);
return 0;
}
/* Add other config variables here and to Documentation/config.txt. */
return 0;
}

/*
* All source specific fields in the union, die_on_error, name and the callbacks
* fgetc, ungetc, ftell of top need to be initialized before calling
* this function.
*/
static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
{
int ret;

/* push config-file parsing state stack */
top->prev = cf;
top->linenr = 1;
top->eof = 0;
strbuf_init(&top->value, 1024);
strbuf_init(&top->var, 1024);
cf = top;

ret = git_parse_source(fn, data);

/* pop config-file parsing state stack */
strbuf_release(&top->value);
strbuf_release(&top->var);
cf = top->prev;

return ret;
}

static int do_config_from_file(config_fn_t fn,
const char *name, const char *path, FILE *f, void *data)
{
struct config_source top;

top.u.file = f;
top.name = name;
top.path = path;
top.die_on_error = 1;
top.do_fgetc = config_file_fgetc;
top.do_ungetc = config_file_ungetc;
top.do_ftell = config_file_ftell;

return do_config_from(&top, fn, data);
}

static int git_config_from_stdin(config_fn_t fn, void *data)
{
return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
}

int git_config_from_file(config_fn_t fn, const char *filename, void *data)
{
int ret = -1;
FILE *f;

f = fopen(filename, "r");
if (f) {
ret = do_config_from_file(fn, filename, filename, f, data);
fclose(f);
}
return ret;
}

int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
size_t len, void *data)
{
struct config_source top;

top.u.buf.buf = buf;
top.u.buf.len = len;
top.u.buf.pos = 0;
top.name = name;
top.path = NULL;
top.die_on_error = 0;
top.do_fgetc = config_buf_fgetc;
top.do_ungetc = config_buf_ungetc;
top.do_ftell = config_buf_ftell;

return do_config_from(&top, fn, data);
}

static int git_config_from_blob_sha1(config_fn_t fn,
const char *name,
const unsigned char *sha1,
void *data)
{
enum object_type type;
char *buf;
unsigned long size;
int ret;

buf = read_sha1_file(sha1, &type, &size);
if (!buf)
return error("unable to load config blob object '%s'", name);
if (type != OBJ_BLOB) {
free(buf);
return error("reference '%s' does not point to a blob", name);
}

ret = git_config_from_buf(fn, name, buf, size, data);
free(buf);

return ret;
}

static int git_config_from_blob_ref(config_fn_t fn,
const char *name,
void *data)
{
unsigned char sha1[20];

if (get_sha1(name, sha1) < 0)
return error("unable to resolve config blob '%s'", name);
return git_config_from_blob_sha1(fn, name, sha1, data);
}

const char *git_etc_gitconfig(void)
{
static const char *system_wide;
if (!system_wide)
system_wide = system_path(ETC_GITCONFIG);
return system_wide;
}

int git_env_bool(const char *k, int def)
{
const char *v = getenv(k);
return v ? git_config_bool(k, v) : def;
}

int git_config_system(void)
{
return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
}

int git_config_early(config_fn_t fn, void *data, const char *repo_config)
{
int ret = 0, found = 0;
char *xdg_config = NULL;
char *user_config = NULL;

home_config_paths(&user_config, &xdg_config, "config");

if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
ret += git_config_from_file(fn, git_etc_gitconfig(),
data);
found += 1;
}

if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
ret += git_config_from_file(fn, xdg_config, data);
found += 1;
}

if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
ret += git_config_from_file(fn, user_config, data);
found += 1;
}

if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
ret += git_config_from_file(fn, repo_config, data);
found += 1;
}

switch (git_config_from_parameters(fn, data)) {
case -1: /* error */
die("unable to parse command-line config");
break;
case 0: /* found nothing */
break;
default: /* found at least one item */
found++;
break;
}

free(xdg_config);
free(user_config);
return ret == 0 ? found : ret;
}

int git_config_with_options(config_fn_t fn, void *data,
struct git_config_source *config_source,
int respect_includes)
{
char *repo_config = NULL;
int ret;
struct config_include_data inc = CONFIG_INCLUDE_INIT;

if (respect_includes) {
inc.fn = fn;
inc.data = data;
fn = git_config_include;
data = &inc;
}

/*
* If we have a specific filename, use it. Otherwise, follow the
* regular lookup sequence.
*/
if (config_source && config_source->use_stdin)
return git_config_from_stdin(fn, data);
else if (config_source && config_source->file)
return git_config_from_file(fn, config_source->file, data);
else if (config_source && config_source->blob)
return git_config_from_blob_ref(fn, config_source->blob, data);

repo_config = git_pathdup("config");
ret = git_config_early(fn, data, repo_config);
if (repo_config)
free(repo_config);
return ret;
}

int git_config(config_fn_t fn, void *data)
{
return git_config_with_options(fn, data, NULL, 1);
}

/*
* Find all the stuff for git_config_set() below.
*/

static struct {
int baselen;
char *key;
int do_not_match;
regex_t *value_regex;
int multi_replace;
size_t *offset;
unsigned int offset_alloc;
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, void *cb)
{
const char *ep;
size_t section_len;

switch (store.state) {
case KEY_SEEN:
if (matches(key, value)) {
if (store.seen == 1 && store.multi_replace == 0) {
warning("%s has multiple values", key);
}

ALLOC_GROW(store.offset, store.seen + 1,
store.offset_alloc);

store.offset[store.seen] = cf->do_ftell(cf);
store.seen++;
}
break;
case SECTION_SEEN:
/*
* What we are looking for is in store.key (both
* section and var), and its section part is baselen
* long. We found key (again, both section and var).
* We would want to know if this key is in the same
* section as what we are looking for. We already
* know we are in the same section as what should
* hold store.key.
*/
ep = strrchr(key, '.');
section_len = ep - key;

if ((section_len != store.baselen) ||
memcmp(key, store.key, section_len+1)) {
store.state = SECTION_END_SEEN;
break;
}

/*
* Do not increment matches: this is no match, but we
* just made sure we are in the desired section.
*/
ALLOC_GROW(store.offset, store.seen + 1,
store.offset_alloc);
store.offset[store.seen] = cf->do_ftell(cf);
/* fallthru */
case SECTION_END_SEEN:
case START:
if (matches(key, value)) {
ALLOC_GROW(store.offset, store.seen + 1,
store.offset_alloc);
store.offset[store.seen] = cf->do_ftell(cf);
store.state = KEY_SEEN;
store.seen++;
} else {
if (strrchr(key, '.') - key == store.baselen &&
!strncmp(key, store.key, store.baselen)) {
store.state = SECTION_SEEN;
ALLOC_GROW(store.offset,
store.seen + 1,
store.offset_alloc);
store.offset[store.seen] = cf->do_ftell(cf);
}
}
}
return 0;
}

static int write_error(const char *filename)
{
error("failed to write new configuration file %s", filename);

/* Same error code as "failed to rename". */
return 4;
}

static int store_write_section(int fd, const char *key)
{
const char *dot;
int i, success;
struct strbuf sb = STRBUF_INIT;

dot = memchr(key, '.', store.baselen);
if (dot) {
strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
for (i = dot - key + 1; i < store.baselen; i++) {
if (key[i] == '"' || key[i] == '\\')
strbuf_addch(&sb, '\\');
strbuf_addch(&sb, key[i]);
}
strbuf_addstr(&sb, "\"]\n");
} else {
strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
}

success = write_in_full(fd, sb.buf, sb.len) == sb.len;
strbuf_release(&sb);

return success;
}

static int store_write_pair(int fd, const char *key, const char *value)
{
int i, success;
int length = strlen(key + store.baselen + 1);
const char *quote = "";
struct strbuf sb = STRBUF_INIT;

/*
* Check to see if the value needs to be surrounded with a dq pair.
* Note that problematic characters are always backslash-quoted; this
* 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) == 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;
}
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 git_config_set_in_file(const char *config_filename,
const char *key, const char *value)
{
return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
}

int git_config_set(const char *key, const char *value)
{
return git_config_set_multivar(key, value, NULL, 0);
}

/*
* Auxiliary function to sanity-check and split the key into the section
* identifier and variable name.
*
* Returns 0 on success, -1 when there is an invalid character in the key and
* -2 if there is no section name in the key.
*
* store_key - pointer to char* which will hold a copy of the key with
* lowercase section and variable name
* baselen - pointer to int which will hold the length of the
* section + subsection part, can be NULL
*/
int git_config_parse_key(const char *key, char **store_key, int *baselen_)
{
int i, dot, baselen;
const char *last_dot = strrchr(key, '.');

/*
* 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 || last_dot == key) {
error("key does not contain a section: %s", key);
return -CONFIG_NO_SECTION_OR_NAME;
}

if (!last_dot[1]) {
error("key does not contain variable name: %s", key);
return -CONFIG_NO_SECTION_OR_NAME;
}

baselen = last_dot - key;
if (baselen_)
*baselen_ = baselen;

/*
* Validate the key and while at it, lower case it for matching.
*/
*store_key = xmalloc(strlen(key) + 1);

dot = 0;
for (i = 0; key[i]; i++) {
unsigned char c = key[i];
if (c == '.')
dot = 1;
/* Leave the extended basename untouched.. */
if (!dot || i > baselen) {
if (!iskeychar(c) ||
(i == baselen + 1 && !isalpha(c))) {
error("invalid key: %s", key);
goto out_free_ret_1;
}
c = tolower(c);
} else if (c == '\n') {
error("invalid key (newline): %s", key);
goto out_free_ret_1;
}
(*store_key)[i] = c;
}
(*store_key)[i] = 0;

return 0;

out_free_ret_1:
free(*store_key);
*store_key = NULL;
return -CONFIG_INVALID_KEY;
}

/*
* 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_in_file(const char *config_filename,
const char *key, const char *value,
const char *value_regex, int multi_replace)
{
int fd = -1, in_fd;
int ret;
struct lock_file *lock = NULL;
char *filename_buf = NULL;

/* parse-key returns negative; flip the sign to feed exit(3) */
ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
if (ret)
goto out_free;

store.multi_replace = multi_replace;

if (!config_filename)
config_filename = filename_buf = git_pathdup("config");

/*
* The lock serves a purpose in addition to locking: the new
* contents of .git/config will be written into it.
*/
lock = xcalloc(sizeof(struct lock_file), 1);
fd = hold_lock_file_for_update(lock, config_filename, 0);
if (fd < 0) {
error("could not lock config file %s: %s", config_filename, strerror(errno));
free(store.key);
ret = CONFIG_NO_LOCK;
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 = CONFIG_INVALID_FILE; /* same as "invalid config file" */
goto out_free;
}
/* if nothing to unset, error out */
if (value == NULL) {
ret = CONFIG_NOTHING_SET;
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;
size_t contents_sz, copy_begin, copy_end;
int i, new_line = 0;

if (value_regex == NULL)
store.value_regex = NULL;
else {
if (value_regex[0] == '!') {
store.do_not_match = 1;
value_regex++;
} else
store.do_not_match = 0;

store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
if (regcomp(store.value_regex, value_regex,
REG_EXTENDED)) {
error("invalid pattern: %s", value_regex);
free(store.value_regex);
ret = CONFIG_INVALID_PATTERN;
goto out_free;
}
}

ALLOC_GROW(store.offset, 1, store.offset_alloc);
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, 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 = CONFIG_INVALID_FILE;
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 = CONFIG_NOTHING_SET;
goto out_free;
}

fstat(in_fd, &st);
contents_sz = xsize_t(st.st_size);
contents = xmmap(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_str_in_full(fd, "\n") != 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);
}

if (commit_lock_file(lock) < 0) {
error("could not commit config file %s", config_filename);
ret = CONFIG_NO_WRITE;
goto out_free;
}

/*
* lock is committed, so don't try to roll it back below.
* NOTE: Since lockfile.c keeps a linked list of all created
* lock_file structures, it isn't safe to free(lock). It's
* better to just leave it hanging around.
*/
lock = NULL;
ret = 0;

out_free:
if (lock)
rollback_lock_file(lock);
free(filename_buf);
return ret;

write_err_out:
ret = write_error(lock->filename);
goto out_free;

}

int git_config_set_multivar(const char *key, const char *value,
const char *value_regex, int multi_replace)
{
return git_config_set_multivar_in_file(NULL, key, value, value_regex,
multi_replace);
}

static int section_name_match (const char *buf, const char *name)
{
int i = 0, j = 0, dot = 0;
if (buf[i] != '[')
return 0;
for (i = 1; buf[i] && buf[i] != ']'; i++) {
if (!dot && isspace(buf[i])) {
dot = 1;
if (name[j++] != '.')
break;
for (i++; isspace(buf[i]); i++)
; /* do nothing */
if (buf[i] != '"')
break;
continue;
}
if (buf[i] == '\\' && dot)
i++;
else if (buf[i] == '"' && dot) {
for (i++; isspace(buf[i]); i++)
; /* do_nothing */
break;
}
if (buf[i] != name[j++])
break;
}
if (buf[i] == ']' && name[j] == 0) {
/*
* We match, now just find the right length offset by
* gobbling up any whitespace after it, as well
*/
i++;
for (; buf[i] && isspace(buf[i]); i++)
; /* do nothing */
return i;
}
return 0;
}

static int section_name_is_ok(const char *name)
{
/* Empty section names are bogus. */
if (!*name)
return 0;

/*
* Before a dot, we must be alphanumeric or dash. After the first dot,
* anything goes, so we can stop checking.
*/
for (; *name && *name != '.'; name++)
if (*name != '-' && !isalnum(*name))
return 0;
return 1;
}

/* if new_name == NULL, the section is removed instead */
int git_config_rename_section_in_file(const char *config_filename,
const char *old_name, const char *new_name)
{
int ret = 0, remove = 0;
char *filename_buf = NULL;
struct lock_file *lock;
int out_fd;
char buf[1024];
FILE *config_file;

if (new_name && !section_name_is_ok(new_name)) {
ret = error("invalid section name: %s", new_name);
goto out;
}

if (!config_filename)
config_filename = filename_buf = git_pathdup("config");

lock = xcalloc(sizeof(struct lock_file), 1);
out_fd = hold_lock_file_for_update(lock, config_filename, 0);
if (out_fd < 0) {
ret = error("could not lock config file %s", config_filename);
goto out;
}

if (!(config_file = fopen(config_filename, "rb"))) {
/* no config file means nothing to rename, no error */
goto unlock_and_out;
}

while (fgets(buf, sizeof(buf), config_file)) {
int i;
int length;
char *output = buf;
for (i = 0; buf[i] && isspace(buf[i]); i++)
; /* do nothing */
if (buf[i] == '[') {
/* it's a section */
int offset = section_name_match(&buf[i], old_name);
if (offset > 0) {
ret++;
if (new_name == NULL) {
remove = 1;
continue;
}
store.baselen = strlen(new_name);
if (!store_write_section(out_fd, new_name)) {
ret = write_error(lock->filename);
goto out;
}
/*
* We wrote out the new section, with
* a newline, now skip the old
* section's length
*/
output += offset + i;
if (strlen(output) > 0) {
/*
* More content means there's
* a declaration to put on the
* next line; indent with a
* tab
*/
output -= 1;
output[0] = '\t';
}
}
remove = 0;
}
if (remove)
continue;
length = strlen(output);
if (write_in_full(out_fd, output, length) != length) {
ret = write_error(lock->filename);
goto out;
}
}
fclose(config_file);
unlock_and_out:
if (commit_lock_file(lock) < 0)
ret = error("could not commit config file %s", config_filename);
out:
free(filename_buf);
return ret;
}

int git_config_rename_section(const char *old_name, const char *new_name)
{
return git_config_rename_section_in_file(NULL, old_name, new_name);
}

/*
* Call this to report error for your variable that should not
* get a boolean value (i.e. "[my] var" means "true").
*/
#undef config_error_nonbool
int config_error_nonbool(const char *var)
{
return error("Missing value for '%s'", var);
}

int parse_config_key(const char *var,
const char *section,
const char **subsection, int *subsection_len,
const char **key)
{
int section_len = strlen(section);
const char *dot;

/* Does it start with "section." ? */
if (!starts_with(var, section) || var[section_len] != '.')
return -1;

/*
* Find the key; we don't know yet if we have a subsection, but we must
* parse backwards from the end, since the subsection may have dots in
* it, too.
*/
dot = strrchr(var, '.');
*key = dot + 1;

/* Did we have a subsection at all? */
if (dot == var + section_len) {
*subsection = NULL;
*subsection_len = 0;
}
else {
*subsection = var + section_len + 1;
*subsection_len = dot - *subsection;
}

return 0;
}
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