config.c 26.2 KB
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/*
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 * Copyright (C) the libgit2 contributors. All rights reserved.
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 *
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 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
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 */

#include "common.h"
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#include "sysdir.h"
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#include "config.h"
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#include "git2/config.h"
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#include "git2/sys/config.h"
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#include "vector.h"
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#include "buf_text.h"
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#include "config_file.h"
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#if GIT_WIN32
# include <windows.h>
#endif
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#include <ctype.h>

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typedef struct {
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	git_refcount rc;

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	git_config_backend *file;
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	git_config_level_t level;
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} file_internal;
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static void file_internal_free(file_internal *internal)
{
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	git_config_backend *file;
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	file = internal->file;
	file->free(file);
	git__free(internal);
}

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static void config_free(git_config *cfg)
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{
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	size_t i;
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	file_internal *internal;
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	for (i = 0; i < cfg->files.length; ++i) {
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		internal = git_vector_get(&cfg->files, i);
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		GIT_REFCOUNT_DEC(internal, file_internal_free);
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	}
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	git_vector_free(&cfg->files);
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	git__memzero(cfg, sizeof(*cfg));
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	git__free(cfg);
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}

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void git_config_free(git_config *cfg)
{
	if (cfg == NULL)
		return;

	GIT_REFCOUNT_DEC(cfg, config_free);
}

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static int config_backend_cmp(const void *a, const void *b)
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{
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	const file_internal *bk_a = (const file_internal *)(a);
	const file_internal *bk_b = (const file_internal *)(b);
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	return bk_b->level - bk_a->level;
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}

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int git_config_new(git_config **out)
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{
	git_config *cfg;

	cfg = git__malloc(sizeof(git_config));
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	GITERR_CHECK_ALLOC(cfg);
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	memset(cfg, 0x0, sizeof(git_config));

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	if (git_vector_init(&cfg->files, 3, config_backend_cmp) < 0) {
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		git__free(cfg);
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		return -1;
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	}
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	*out = cfg;
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	GIT_REFCOUNT_INC(cfg);
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	return 0;
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}
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int git_config_add_file_ondisk(
	git_config *cfg,
	const char *path,
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	git_config_level_t level,
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	int force)
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{
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	git_config_backend *file = NULL;
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	struct stat st;
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	int res;
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	assert(cfg && path);

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	res = p_stat(path, &st);
	if (res < 0 && errno != ENOENT) {
		giterr_set(GITERR_CONFIG, "Error stat'ing config file '%s'", path);
		return -1;
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	}

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	if (git_config_file__ondisk(&file, path) < 0)
		return -1;
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	if ((res = git_config_add_backend(cfg, file, level, force)) < 0) {
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		/*
		 * free manually; the file is not owned by the config
		 * instance yet and will not be freed on cleanup
		 */
		file->free(file);
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		return res;
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	}

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	return 0;
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}

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int git_config_open_ondisk(git_config **out, const char *path)
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{
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	int error;
	git_config *config;
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	*out = NULL;

	if (git_config_new(&config) < 0)
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		return -1;
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	if ((error = git_config_add_file_ondisk(config, path, GIT_CONFIG_LEVEL_LOCAL, 0)) < 0)
		git_config_free(config);
	else
		*out = config;

	return error;
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}

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static int find_internal_file_by_level(
	file_internal **internal_out,
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	const git_config *cfg,
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	git_config_level_t level)
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{
	int pos = -1;
	file_internal *internal;
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	size_t i;
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	/* when passing GIT_CONFIG_HIGHEST_LEVEL, the idea is to get the config file
	 * which has the highest level. As config files are stored in a vector
	 * sorted by decreasing order of level, getting the file at position 0
	 * will do the job.
	 */
	if (level == GIT_CONFIG_HIGHEST_LEVEL) {
		pos = 0;
	} else {
		git_vector_foreach(&cfg->files, i, internal) {
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			if (internal->level == level)
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				pos = (int)i;
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		}
	}

	if (pos == -1) {
		giterr_set(GITERR_CONFIG,
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			"No config file exists for the given level '%i'", (int)level);
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		return GIT_ENOTFOUND;
	}

	*internal_out = git_vector_get(&cfg->files, pos);

	return 0;
}

static int duplicate_level(void **old_raw, void *new_raw)
{
	file_internal **old = (file_internal **)old_raw;

	GIT_UNUSED(new_raw);

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	giterr_set(GITERR_CONFIG, "A file with the same level (%i) has already been added to the config", (int)(*old)->level);
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	return GIT_EEXISTS;
}

static void try_remove_existing_file_internal(
	git_config *cfg,
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	git_config_level_t level)
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{
	int pos = -1;
	file_internal *internal;
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	size_t i;
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	git_vector_foreach(&cfg->files, i, internal) {
		if (internal->level == level)
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			pos = (int)i;
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	}

	if (pos == -1)
		return;

	internal = git_vector_get(&cfg->files, pos);

	if (git_vector_remove(&cfg->files, pos) < 0)
		return;

	GIT_REFCOUNT_DEC(internal, file_internal_free);
}

static int git_config__add_internal(
	git_config *cfg,
	file_internal *internal,
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	git_config_level_t level,
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	int force)
{
	int result;

	/* delete existing config file for level if it exists */
	if (force)
		try_remove_existing_file_internal(cfg, level);

	if ((result = git_vector_insert_sorted(&cfg->files,
			internal, &duplicate_level)) < 0)
		return result;

	git_vector_sort(&cfg->files);
	internal->file->cfg = cfg;

	GIT_REFCOUNT_INC(internal);

	return 0;
}

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int git_config_open_global(git_config **cfg_out, git_config *cfg)
{
	if (!git_config_open_level(cfg_out, cfg, GIT_CONFIG_LEVEL_XDG))
		return 0;

	return git_config_open_level(cfg_out, cfg, GIT_CONFIG_LEVEL_GLOBAL);
}

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int git_config_open_level(
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	git_config **cfg_out,
	const git_config *cfg_parent,
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	git_config_level_t level)
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{
	git_config *cfg;
	file_internal *internal;
	int res;

	if ((res = find_internal_file_by_level(&internal, cfg_parent, level)) < 0)
		return res;

	if ((res = git_config_new(&cfg)) < 0)
		return res;

	if ((res = git_config__add_internal(cfg, internal, level, true)) < 0) {
		git_config_free(cfg);
		return res;
	}

	*cfg_out = cfg;

	return 0;
}

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int git_config_add_backend(
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	git_config *cfg,
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	git_config_backend *file,
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	git_config_level_t level,
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	int force)
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{
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	file_internal *internal;
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	int result;
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	assert(cfg && file);
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	GITERR_CHECK_VERSION(file, GIT_CONFIG_BACKEND_VERSION, "git_config_backend");
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	if ((result = file->open(file, level)) < 0)
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		return result;
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	internal = git__malloc(sizeof(file_internal));
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	GITERR_CHECK_ALLOC(internal);
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	memset(internal, 0x0, sizeof(file_internal));

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	internal->file = file;
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	internal->level = level;
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	if ((result = git_config__add_internal(cfg, internal, level, force)) < 0) {
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		git__free(internal);
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		return result;
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	}
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	return 0;
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}

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int git_config_refresh(git_config *cfg)
{
	int error = 0;
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	size_t i;
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	for (i = 0; i < cfg->files.length && !error; ++i) {
		file_internal *internal = git_vector_get(&cfg->files, i);
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		git_config_backend *file = internal->file;
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		error = file->refresh(file);
	}

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	if (!error && GIT_REFCOUNT_OWNER(cfg) != NULL)
		git_repository__cvar_cache_clear(GIT_REFCOUNT_OWNER(cfg));

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	return error;
}

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/*
 * Loop over all the variables
 */

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typedef struct {
	git_config_iterator parent;
	git_config_iterator *current;
	const git_config *cfg;
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	regex_t regex;
	int has_regex;
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	size_t i;
} all_iter;

static int find_next_backend(size_t *out, const git_config *cfg, size_t i)
{
	file_internal *internal;

	for (; i > 0; --i) {
		internal = git_vector_get(&cfg->files, i - 1);
		if (!internal || !internal->file)
			continue;

		*out = i;
		return 0;
	}

	return -1;
}

static int all_iter_next(git_config_entry **entry, git_config_iterator *_iter)
{
	all_iter *iter = (all_iter *) _iter;
	file_internal *internal;
	git_config_backend *backend;
	size_t i;
	int error = 0;

	if (iter->current != NULL &&
	    (error = iter->current->next(entry, iter->current)) == 0) {
		return 0;
	}

	if (error < 0 && error != GIT_ITEROVER)
		return error;

	do {
		if (find_next_backend(&i, iter->cfg, iter->i) < 0)
			return GIT_ITEROVER;

		internal = git_vector_get(&iter->cfg->files, i - 1);
		backend = internal->file;
		iter->i = i - 1;

		if (iter->current)
			iter->current->free(iter->current);

		iter->current = NULL;
		error = backend->iterator(&iter->current, backend);
		if (error == GIT_ENOTFOUND)
			continue;

		if (error < 0)
			return error;

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		error = iter->current->next(entry, iter->current);
		/* If this backend is empty, then keep going */
		if (error == GIT_ITEROVER)
			continue;

		return error;
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	} while(1);

	return GIT_ITEROVER;
}

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static int all_iter_glob_next(git_config_entry **entry, git_config_iterator *_iter)
{
	int error;
	all_iter *iter = (all_iter *) _iter;

	/*
	 * We use the "normal" function to grab the next one across
	 * backends and then apply the regex
	 */
	while ((error = all_iter_next(entry, _iter)) == 0) {
		/* skip non-matching keys if regexp was provided */
		if (regexec(&iter->regex, (*entry)->name, 0, NULL, 0) != 0)
			continue;

		/* and simply return if we like the entry's name */
		return 0;
	}

	return error;
}

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static void all_iter_free(git_config_iterator *_iter)
{
	all_iter *iter = (all_iter *) _iter;

	if (iter->current)
		iter->current->free(iter->current);

	git__free(iter);
}

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static void all_iter_glob_free(git_config_iterator *_iter)
{
	all_iter *iter = (all_iter *) _iter;

	regfree(&iter->regex);
	all_iter_free(_iter);
}

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int git_config_iterator_new(git_config_iterator **out, const git_config *cfg)
{
	all_iter *iter;

	iter = git__calloc(1, sizeof(all_iter));
	GITERR_CHECK_ALLOC(iter);

	iter->parent.free = all_iter_free;
	iter->parent.next = all_iter_next;

	iter->i = cfg->files.length;
	iter->cfg = cfg;

	*out = (git_config_iterator *) iter;

	return 0;
}

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int git_config_iterator_glob_new(git_config_iterator **out, const git_config *cfg, const char *regexp)
{
	all_iter *iter;
	int result;

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	if (regexp == NULL)
		return git_config_iterator_new(out, cfg);

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	iter = git__calloc(1, sizeof(all_iter));
	GITERR_CHECK_ALLOC(iter);

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	if ((result = regcomp(&iter->regex, regexp, REG_EXTENDED)) < 0) {
		giterr_set_regex(&iter->regex, result);
		regfree(&iter->regex);
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		git__free(iter);
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		return -1;
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	}

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	iter->parent.next = all_iter_glob_next;
	iter->parent.free = all_iter_glob_free;
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	iter->i = cfg->files.length;
	iter->cfg = cfg;

	*out = (git_config_iterator *) iter;

	return 0;
}

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int git_config_foreach(
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	const git_config *cfg, git_config_foreach_cb cb, void *payload)
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{
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	return git_config_foreach_match(cfg, NULL, cb, payload);
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}

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int git_config_backend_foreach_match(
	git_config_backend *backend,
	const char *regexp,
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	git_config_foreach_cb cb,
	void *payload)
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{
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	git_config_entry *entry;
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	git_config_iterator* iter;
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	regex_t regex;
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	int error = 0;
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	if (regexp != NULL) {
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		if ((error = regcomp(&regex, regexp, REG_EXTENDED)) < 0) {
			giterr_set_regex(&regex, error);
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			regfree(&regex);
			return -1;
		}
	}

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	if ((error = backend->iterator(&iter, backend)) < 0) {
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		iter = NULL;
		return -1;
	}
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	while (!(iter->next(&entry, iter) < 0)) {
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		/* skip non-matching keys if regexp was provided */
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		if (regexp && regexec(&regex, entry->name, 0, NULL, 0) != 0)
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			continue;

		/* abort iterator on non-zero return value */
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		if ((error = cb(entry, payload)) != 0) {
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			giterr_set_after_callback(error);
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			break;
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		}
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	}

	if (regexp != NULL)
		regfree(&regex);

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	iter->free(iter);
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	return error;
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}

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int git_config_foreach_match(
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	const git_config *cfg,
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	const char *regexp,
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	git_config_foreach_cb cb,
	void *payload)
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{
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	int error;
	git_config_iterator *iter;
	git_config_entry *entry;
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	if ((error = git_config_iterator_glob_new(&iter, cfg, regexp)) < 0)
		return error;

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	while (!(error = git_config_next(&entry, iter))) {
		if ((error = cb(entry, payload)) != 0) {
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			giterr_set_after_callback(error);
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			break;
		}
	}
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	git_config_iterator_free(iter);

	if (error == GIT_ITEROVER)
		error = 0;

	return error;
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}

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/**************
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 * Setters
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 **************/
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static int config_error_nofiles(const char *name)
{
	giterr_set(GITERR_CONFIG,
		"Cannot set value for '%s' when no config files exist", name);
	return GIT_ENOTFOUND;
}

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int git_config_delete_entry(git_config *cfg, const char *name)
{
	git_config_backend *file;
	file_internal *internal;

	internal = git_vector_get(&cfg->files, 0);
	if (!internal || !internal->file)
		return config_error_nofiles(name);
	file = internal->file;

	return file->del(file, name);
}

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int git_config_set_int64(git_config *cfg, const char *name, int64_t value)
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{
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	char str_value[32]; /* All numbers should fit in here */
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	p_snprintf(str_value, sizeof(str_value), "%" PRId64, value);
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	return git_config_set_string(cfg, name, str_value);
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}
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int git_config_set_int32(git_config *cfg, const char *name, int32_t value)
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{
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	return git_config_set_int64(cfg, name, (int64_t)value);
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}

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int git_config_set_bool(git_config *cfg, const char *name, int value)
{
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	return git_config_set_string(cfg, name, value ? "true" : "false");
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}
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int git_config_set_string(git_config *cfg, const char *name, const char *value)
{
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	int error;
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	git_config_backend *file;
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	file_internal *internal;
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	if (!value) {
		giterr_set(GITERR_CONFIG, "The value to set cannot be NULL");
		return -1;
	}

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	internal = git_vector_get(&cfg->files, 0);
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	if (!internal || !internal->file)
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		return config_error_nofiles(name);
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	file = internal->file;
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	error = file->set(file, name, value);

	if (!error && GIT_REFCOUNT_OWNER(cfg) != NULL)
		git_repository__cvar_cache_clear(GIT_REFCOUNT_OWNER(cfg));

	return error;
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}

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int git_config__update_entry(
	git_config *config,
	const char *key,
	const char *value,
	bool overwrite_existing,
	bool only_if_existing)
{
	int error = 0;
	const git_config_entry *ce = NULL;

	if ((error = git_config__lookup_entry(&ce, config, key, false)) < 0)
		return error;

	if (!ce && only_if_existing) /* entry doesn't exist */
		return 0;
	if (ce && !overwrite_existing) /* entry would be overwritten */
		return 0;
	if (value && ce && ce->value && !strcmp(ce->value, value)) /* no change */
		return 0;
	if (!value && (!ce || !ce->value)) /* asked to delete absent entry */
		return 0;

	if (!value)
		error = git_config_delete_entry(config, key);
	else
		error = git_config_set_string(config, key, value);

	return error;
}

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/***********
 * Getters
 ***********/
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static int config_error_notfound(const char *name)
{
	giterr_set(GITERR_CONFIG, "Config value '%s' was not found", name);
	return GIT_ENOTFOUND;
}

enum {
	GET_ALL_ERRORS = 0,
	GET_NO_MISSING = 1,
	GET_NO_ERRORS  = 2
};

static int get_entry(
	const git_config_entry **out,
	const git_config *cfg,
	const char *name,
	bool normalize_name,
	int want_errors)
{
	int res = GIT_ENOTFOUND;
	const char *key = name;
	char *normalized = NULL;
	size_t i;
	file_internal *internal;

	*out = NULL;

	if (normalize_name) {
		if ((res = git_config__normalize_name(name, &normalized)) < 0)
			goto cleanup;
		key = normalized;
	}

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	res = GIT_ENOTFOUND;
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	git_vector_foreach(&cfg->files, i, internal) {
		if (!internal || !internal->file)
			continue;

		res = internal->file->get(internal->file, key, out);
		if (res != GIT_ENOTFOUND)
			break;
	}

	git__free(normalized);

cleanup:
	if (res == GIT_ENOTFOUND)
		res = (want_errors > GET_ALL_ERRORS) ? 0 : config_error_notfound(name);
	else if (res && (want_errors == GET_NO_ERRORS)) {
		giterr_clear();
		res = 0;
	}

	return res;
}

int git_config_get_entry(
	const git_config_entry **out, const git_config *cfg, const char *name)
{
	return get_entry(out, cfg, name, true, GET_ALL_ERRORS);
}

int git_config__lookup_entry(
	const git_config_entry **out,
	const git_config *cfg,
	const char *key,
	bool no_errors)
{
	return get_entry(
		out, cfg, key, false, no_errors ? GET_NO_ERRORS : GET_NO_MISSING);
}

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int git_config_get_mapped(
	int *out,
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	const git_config *cfg,
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	const char *name,
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	const git_cvar_map *maps,
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	size_t map_n)
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{
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	const git_config_entry *entry;
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	int ret;
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	if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
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		return ret;
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	return git_config_lookup_map_value(out, maps, map_n, entry->value);
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}

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int git_config_get_int64(int64_t *out, const git_config *cfg, const char *name)
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{
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	const git_config_entry *entry;
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	int ret;
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	if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
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		return ret;
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	return git_config_parse_int64(out, entry->value);
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}

Ben Straub committed
751
int git_config_get_int32(int32_t *out, const git_config *cfg, const char *name)
752
{
753
	const git_config_entry *entry;
Vicent Martí committed
754
	int ret;
755

756
	if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
Vicent Martí committed
757
		return ret;
758

759
	return git_config_parse_int32(out, entry->value);
760 761
}

762
int git_config_get_bool(int *out, const git_config *cfg, const char *name)
763 764
{
	const git_config_entry *entry;
765
	int ret;
766

767 768
	if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
		return ret;
769

770
	return git_config_parse_bool(out, entry->value);
771 772
}

773 774
int git_config_get_string(
	const char **out, const git_config *cfg, const char *name)
775
{
776 777 778 779
	const git_config_entry *entry;
	int ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS);
	*out = !ret ? (entry->value ? entry->value : "") : NULL;
	return ret;
780 781
}

782 783
const char *git_config__get_string_force(
	const git_config *cfg, const char *key, const char *fallback_value)
784
{
785 786 787
	const git_config_entry *entry;
	get_entry(&entry, cfg, key, false, GET_NO_ERRORS);
	return (entry && entry->value) ? entry->value : fallback_value;
788 789
}

790 791
int git_config__get_bool_force(
	const git_config *cfg, const char *key, int fallback_value)
792
{
793 794
	int val = fallback_value;
	const git_config_entry *entry;
795

796
	get_entry(&entry, cfg, key, false, GET_NO_ERRORS);
797

798 799
	if (entry && git_config_parse_bool(&val, entry->value) < 0)
		giterr_clear();
800

801
	return val;
802 803
}

804 805
int git_config__get_int_force(
	const git_config *cfg, const char *key, int fallback_value)
806
{
807 808
	int32_t val = (int32_t)fallback_value;
	const git_config_entry *entry;
Vicent Martí committed
809

810
	get_entry(&entry, cfg, key, false, GET_NO_ERRORS);
811

812 813
	if (entry && git_config_parse_int32(&val, entry->value) < 0)
		giterr_clear();
814

815
	return (int)val;
816 817
}

818
int git_config_get_multivar_foreach(
819 820
	const git_config *cfg, const char *name, const char *regexp,
	git_config_foreach_cb cb, void *payload)
821
{
822 823 824
	int err, found;
	git_config_iterator *iter;
	git_config_entry *entry;
825

826
	if ((err = git_config_multivar_iterator_new(&iter, cfg, name, regexp)) < 0)
827
		return err;
828

829 830 831
	found = 0;
	while ((err = iter->next(&entry, iter)) == 0) {
		found = 1;
832

833
		if ((err = cb(entry, payload)) != 0) {
834
			giterr_set_after_callback(err);
835
			break;
836
		}
837 838
	}

839
	iter->free(iter);
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	if (err == GIT_ITEROVER)
		err = 0;

	if (found == 0 && err == 0)
		err = config_error_notfound(name);

	return err;
847 848
}

849
typedef struct {
850
	git_config_iterator parent;
851
	git_config_iterator *iter;
852
	char *name;
853 854
	regex_t regex;
	int have_regex;
855 856
} multivar_iter;

857
static int multivar_iter_next(git_config_entry **entry, git_config_iterator *_iter)
858 859
{
	multivar_iter *iter = (multivar_iter *) _iter;
860
	int error = 0;
861

862 863
	while ((error = iter->iter->next(entry, iter->iter)) == 0) {
		if (git__strcmp(iter->name, (*entry)->name))
864 865
			continue;

866 867
		if (!iter->have_regex)
			return 0;
868

869 870 871
		if (regexec(&iter->regex, (*entry)->value, 0, NULL, 0) == 0)
			return 0;
	}
872

873
	return error;
874
}
875

876 877 878 879
void multivar_iter_free(git_config_iterator *_iter)
{
	multivar_iter *iter = (multivar_iter *) _iter;

880
	iter->iter->free(iter->iter);
881

882
	git__free(iter->name);
883
	regfree(&iter->regex);
884 885 886
	git__free(iter);
}

887
int git_config_multivar_iterator_new(git_config_iterator **out, const git_config *cfg, const char *name, const char *regexp)
888
{
889 890 891 892 893 894
	multivar_iter *iter = NULL;
	git_config_iterator *inner = NULL;
	int error;

	if ((error = git_config_iterator_new(&inner, cfg)) < 0)
		return error;
895

896
	iter = git__calloc(1, sizeof(multivar_iter));
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	GITERR_CHECK_ALLOC(iter);

899 900
	if ((error = git_config__normalize_name(name, &iter->name)) < 0)
		goto on_error;
901 902

	if (regexp != NULL) {
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		error = regcomp(&iter->regex, regexp, REG_EXTENDED);
		if (error < 0) {
			giterr_set_regex(&iter->regex, error);
			error = -1;
			regfree(&iter->regex);
			goto on_error;
		}

		iter->have_regex = 1;
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	}

914
	iter->iter = inner;
915
	iter->parent.free = multivar_iter_free;
916
	iter->parent.next = multivar_iter_next;
917

918 919 920
	*out = (git_config_iterator *) iter;

	return 0;
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on_error:

	inner->free(inner);
	git__free(iter);
	return error;
927 928
}

929 930
int git_config_set_multivar(git_config *cfg, const char *name, const char *regexp, const char *value)
{
Ben Straub committed
931
	git_config_backend *file;
932
	file_internal *internal;
933

934
	internal = git_vector_get(&cfg->files, 0);
935
	if (!internal || !internal->file)
936
		return config_error_nofiles(name);
937
	file = internal->file;
938

939
	return file->set_multivar(file, name, regexp, value);
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}

942 943 944 945 946 947 948 949 950 951 952 953 954
int git_config_delete_multivar(git_config *cfg, const char *name, const char *regexp)
{
	git_config_backend *file;
	file_internal *internal;

	internal = git_vector_get(&cfg->files, 0);
	if (!internal || !internal->file)
		return config_error_nofiles(name);
	file = internal->file;

	return file->del_multivar(file, name, regexp);
}

955 956 957 958 959 960 961
int git_config_next(git_config_entry **entry, git_config_iterator *iter)
{
	return iter->next(entry, iter);
}

void git_config_iterator_free(git_config_iterator *iter)
{
962 963 964
	if (iter == NULL)
		return;

965 966 967
	iter->free(iter);
}

968
int git_config_find_global(git_buf *path)
969
{
970
	return git_sysdir_find_global_file(path, GIT_CONFIG_FILENAME_GLOBAL);
971 972
}

973
int git_config_find_xdg(git_buf *path)
974
{
975
	return git_sysdir_find_xdg_file(path, GIT_CONFIG_FILENAME_XDG);
976 977
}

978
int git_config_find_system(git_buf *path)
979
{
980
	return git_sysdir_find_system_file(path, GIT_CONFIG_FILENAME_SYSTEM);
981 982
}

983 984 985 986 987
int git_config__global_location(git_buf *buf)
{
	const git_buf *paths;
	const char *sep, *start;

988
	if (git_sysdir_get(&paths, GIT_SYSDIR_GLOBAL) < 0)
989 990 991
		return -1;

	/* no paths, so give up */
992
	if (!paths || !git_buf_len(paths))
993 994
		return -1;

995 996 997 998 999 1000
	/* find unescaped separator or end of string */
	for (sep = start = git_buf_cstr(paths); *sep; ++sep) {
		if (*sep == GIT_PATH_LIST_SEPARATOR &&
			(sep <= start || sep[-1] != '\\'))
			break;
	}
1001

1002
	if (git_buf_set(buf, start, (size_t)(sep - start)) < 0)
1003 1004 1005 1006 1007
		return -1;

	return git_buf_joinpath(buf, buf->ptr, GIT_CONFIG_FILENAME_GLOBAL);
}

1008
int git_config_open_default(git_config **out)
1009 1010 1011 1012 1013
{
	int error;
	git_config *cfg = NULL;
	git_buf buf = GIT_BUF_INIT;

1014 1015
	if ((error = git_config_new(&cfg)) < 0)
		return error;
1016

1017
	if (!git_config_find_global(&buf) || !git_config__global_location(&buf)) {
1018 1019
		error = git_config_add_file_ondisk(cfg, buf.ptr,
			GIT_CONFIG_LEVEL_GLOBAL, 0);
1020
	}
1021

1022
	if (!error && !git_config_find_xdg(&buf))
1023 1024
		error = git_config_add_file_ondisk(cfg, buf.ptr,
			GIT_CONFIG_LEVEL_XDG, 0);
1025

1026
	if (!error && !git_config_find_system(&buf))
1027 1028
		error = git_config_add_file_ondisk(cfg, buf.ptr,
			GIT_CONFIG_LEVEL_SYSTEM, 0);
1029 1030 1031

	git_buf_free(&buf);

1032
	if (error) {
1033 1034 1035 1036 1037 1038 1039 1040
		git_config_free(cfg);
		cfg = NULL;
	}

	*out = cfg;

	return error;
}
1041 1042 1043 1044

/***********
 * Parsers
 ***********/
1045

1046 1047
int git_config_lookup_map_value(
	int *out,
Ben Straub committed
1048
	const git_cvar_map *maps,
1049 1050 1051 1052 1053 1054 1055 1056 1057
	size_t map_n,
	const char *value)
{
	size_t i;

	if (!value)
		goto fail_parse;

	for (i = 0; i < map_n; ++i) {
Ben Straub committed
1058
		const git_cvar_map *m = maps + i;
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110

		switch (m->cvar_type) {
		case GIT_CVAR_FALSE:
		case GIT_CVAR_TRUE: {
			int bool_val;

			if (git__parse_bool(&bool_val, value) == 0 &&
				bool_val == (int)m->cvar_type) {
				*out = m->map_value;
				return 0;
			}
			break;
		}

		case GIT_CVAR_INT32:
			if (git_config_parse_int32(out, value) == 0)
				return 0;
			break;

		case GIT_CVAR_STRING:
			if (strcasecmp(value, m->str_match) == 0) {
				*out = m->map_value;
				return 0;
			}
			break;
		}
	}

fail_parse:
	giterr_set(GITERR_CONFIG, "Failed to map '%s'", value);
	return -1;
}

int git_config_parse_bool(int *out, const char *value)
{
	if (git__parse_bool(out, value) == 0)
		return 0;

	if (git_config_parse_int32(out, value) == 0) {
		*out = !!(*out);
		return 0;
	}

	giterr_set(GITERR_CONFIG, "Failed to parse '%s' as a boolean value", value);
	return -1;
}

int git_config_parse_int64(int64_t *out, const char *value)
{
	const char *num_end;
	int64_t num;

1111
	if (!value || git__strtol64(&num, value, &num_end, 0) < 0)
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
		goto fail_parse;

	switch (*num_end) {
	case 'g':
	case 'G':
		num *= 1024;
		/* fallthrough */

	case 'm':
	case 'M':
		num *= 1024;
		/* fallthrough */

	case 'k':
	case 'K':
		num *= 1024;

		/* check that that there are no more characters after the
		 * given modifier suffix */
		if (num_end[1] != '\0')
			return -1;

		/* fallthrough */

	case '\0':
		*out = num;
		return 0;

	default:
		goto fail_parse;
	}

fail_parse:
1145
	giterr_set(GITERR_CONFIG, "Failed to parse '%s' as an integer", value ? value : "(null)");
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
	return -1;
}

int git_config_parse_int32(int32_t *out, const char *value)
{
	int64_t tmp;
	int32_t truncate;

	if (git_config_parse_int64(&tmp, value) < 0)
		goto fail_parse;

	truncate = tmp & 0xFFFFFFFF;
	if (truncate != tmp)
		goto fail_parse;

	*out = truncate;
	return 0;

fail_parse:
1165
	giterr_set(GITERR_CONFIG, "Failed to parse '%s' as a 32-bit integer", value ? value : "(null)");
1166 1167
	return -1;
}
1168

1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203
/* Take something the user gave us and make it nice for our hash function */
int git_config__normalize_name(const char *in, char **out)
{
	char *name, *fdot, *ldot;

	assert(in && out);

	name = git__strdup(in);
	GITERR_CHECK_ALLOC(name);

	fdot = strchr(name, '.');
	ldot = strrchr(name, '.');

	if (fdot == NULL || fdot == name || ldot == NULL || !ldot[1])
		goto invalid;

	/* Validate and downcase up to first dot and after last dot */
	if (git_config_file_normalize_section(name, fdot) < 0 ||
		git_config_file_normalize_section(ldot + 1, NULL) < 0)
		goto invalid;

	/* If there is a middle range, make sure it doesn't have newlines */
	while (fdot < ldot)
		if (*fdot++ == '\n')
			goto invalid;

	*out = name;
	return 0;

invalid:
	git__free(name);
	giterr_set(GITERR_CONFIG, "Invalid config item name '%s'", in);
	return GIT_EINVALIDSPEC;
}

1204
struct rename_data {
1205
	git_config *config;
1206 1207
	git_buf *name;
	size_t old_len;
1208 1209 1210 1211 1212 1213
};

static int rename_config_entries_cb(
	const git_config_entry *entry,
	void *payload)
{
1214
	int error = 0;
1215
	struct rename_data *data = (struct rename_data *)payload;
1216
	size_t base_len = git_buf_len(data->name);
1217

1218 1219 1220
	if (base_len > 0 &&
		!(error = git_buf_puts(data->name, entry->name + data->old_len)))
	{
1221
		error = git_config_set_string(
1222
			data->config, git_buf_cstr(data->name), entry->value);
1223

1224
		git_buf_truncate(data->name, base_len);
1225 1226
	}

1227 1228 1229
	if (!error)
		error = git_config_delete_entry(data->config, entry->name);

1230
	return error;
1231 1232 1233 1234 1235 1236 1237 1238
}

int git_config_rename_section(
	git_repository *repo,
	const char *old_section_name,
	const char *new_section_name)
{
	git_config *config;
1239 1240
	git_buf pattern = GIT_BUF_INIT, replace = GIT_BUF_INIT;
	int error = 0;
1241 1242
	struct rename_data data;

1243 1244 1245 1246 1247 1248
	git_buf_text_puts_escape_regex(&pattern, old_section_name);

	if ((error = git_buf_puts(&pattern, "\\..+")) < 0)
		goto cleanup;

	if ((error = git_repository_config__weakptr(&config, repo)) < 0)
1249 1250
		goto cleanup;

1251 1252 1253 1254 1255
	data.config  = config;
	data.name    = &replace;
	data.old_len = strlen(old_section_name) + 1;

	if ((error = git_buf_join(&replace, '.', new_section_name, "")) < 0)
1256 1257
		goto cleanup;

1258 1259 1260 1261 1262 1263 1264
	if (new_section_name != NULL &&
		(error = git_config_file_normalize_section(
			replace.ptr, strchr(replace.ptr, '.'))) < 0)
	{
		giterr_set(
			GITERR_CONFIG, "Invalid config section '%s'", new_section_name);
		goto cleanup;
1265 1266
	}

1267 1268 1269
	error = git_config_foreach_match(
		config, git_buf_cstr(&pattern), rename_config_entries_cb, &data);

1270 1271
cleanup:
	git_buf_free(&pattern);
1272 1273
	git_buf_free(&replace);

1274 1275
	return error;
}
1276

1277
int git_config_init_backend(git_config_backend *backend, unsigned int version)
1278
{
1279 1280 1281
	GIT_INIT_STRUCTURE_FROM_TEMPLATE(
		backend, version, git_config_backend, GIT_CONFIG_BACKEND_INIT);
	return 0;
1282
}