config.c 30 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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#include "transaction.h"
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#if GIT_WIN32
# include <windows.h>
#endif
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#include <ctype.h>

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void git_config_entry_free(git_config_entry *entry)
{
	if (!entry)
		return;

	entry->free(entry);
}

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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) {
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		giterr_set(GITERR_CONFIG, "failed to stat '%s'", path);
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		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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int git_config_snapshot(git_config **out, git_config *in)
{
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	int error = 0;
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	size_t i;
	file_internal *internal;
	git_config *config;

	*out = NULL;

	if (git_config_new(&config) < 0)
		return -1;

	git_vector_foreach(&in->files, i, internal) {
		git_config_backend *b;

		if ((error = internal->file->snapshot(&b, internal->file)) < 0)
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			break;
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		if ((error = git_config_add_backend(config, b, internal->level, 0)) < 0) {
			b->free(b);
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			break;
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		}
	}

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	if (error < 0)
		git_config_free(config);
	else
		*out = config;
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	return error;
}

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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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/*
 * 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;
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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 = p_regcomp(&iter->regex, regexp, REG_EXTENDED)) != 0) {
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		giterr_set_regex(&iter->regex, result);
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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 = p_regcomp(&regex, regexp, REG_EXTENDED)) != 0) {
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			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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typedef enum {
	BACKEND_USE_SET,
	BACKEND_USE_DELETE
} backend_use;

static const char *uses[] = {
    "set",
    "delete"
};

static int get_backend_for_use(git_config_backend **out,
	git_config *cfg, const char *name, backend_use use)
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{
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	size_t i;
	file_internal *f;

	*out = NULL;

	if (git_vector_length(&cfg->files) == 0) {
		giterr_set(GITERR_CONFIG,
			"cannot %s value for '%s' when no config files exist",
			uses[use], name);
		return GIT_ENOTFOUND;
	}

	git_vector_foreach(&cfg->files, i, f) {
		if (!f->file->readonly) {
			*out = f->file;
			return 0;
		}
	}

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	giterr_set(GITERR_CONFIG,
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		"cannot %s value for '%s' when all config files are readonly",
		uses[use], name);
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	return GIT_ENOTFOUND;
}

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

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	if (get_backend_for_use(&file, cfg, name, BACKEND_USE_DELETE) < 0)
		return GIT_ENOTFOUND;
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	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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	if (!value) {
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		giterr_set(GITERR_CONFIG, "the value to set cannot be NULL");
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		return -1;
	}

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	if (get_backend_for_use(&file, cfg, name, BACKEND_USE_SET) < 0)
		return GIT_ENOTFOUND;
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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;
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	git_config_entry *ce = NULL;
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	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);

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	git_config_entry_free(ce);
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	return error;
}

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

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

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

int git_config__lookup_entry(
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	git_config_entry **out,
764 765 766 767 768 769 770 771
	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);
}

772 773
int git_config_get_mapped(
	int *out,
Ben Straub committed
774
	const git_config *cfg,
775
	const char *name,
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776
	const git_cvar_map *maps,
777
	size_t map_n)
778
{
779
	git_config_entry *entry;
780
	int ret;
781

782
	if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
783
		return ret;
784

785 786 787 788
	ret = git_config_lookup_map_value(out, maps, map_n, entry->value);
	git_config_entry_free(entry);

	return ret;
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}

Ben Straub committed
791
int git_config_get_int64(int64_t *out, const git_config *cfg, const char *name)
792
{
793
	git_config_entry *entry;
794
	int ret;
795

796
	if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
Vicent Martí committed
797
		return ret;
798

799 800 801 802
	ret = git_config_parse_int64(out, entry->value);
	git_config_entry_free(entry);

	return ret;
803 804
}

Ben Straub committed
805
int git_config_get_int32(int32_t *out, const git_config *cfg, const char *name)
806
{
807
	git_config_entry *entry;
Vicent Martí committed
808
	int ret;
809

810
	if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
Vicent Martí committed
811
		return ret;
812

813 814 815 816
	ret = git_config_parse_int32(out, entry->value);
	git_config_entry_free(entry);

	return ret;
817 818
}

819
int git_config_get_bool(int *out, const git_config *cfg, const char *name)
820
{
821
	git_config_entry *entry;
822
	int ret;
823

824 825
	if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
		return ret;
826

827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
	ret = git_config_parse_bool(out, entry->value);
	git_config_entry_free(entry);

	return ret;
}

static int is_readonly(const git_config *cfg)
{
	size_t i;
	file_internal *internal;

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

		if (!internal->file->readonly)
			return 0;
	}

	return 1;
847 848
}

849 850
int git_config_get_path(git_buf *out, const git_config *cfg, const char *name)
{
851
	git_config_entry *entry;
852 853 854 855 856
	int error;

	if ((error = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
		return error;

857 858 859 860
	 error = git_config_parse_path(out, entry->value);
	 git_config_entry_free(entry);

	 return error;
861 862
}

863 864
int git_config_get_string(
	const char **out, const git_config *cfg, const char *name)
865
{
866 867 868 869 870 871 872 873 874
	git_config_entry *entry;
	int ret;

	if (!is_readonly(cfg)) {
		giterr_set(GITERR_CONFIG, "get_string called on a live config object");
		return -1;
	}

	ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS);
875
	*out = !ret ? (entry->value ? entry->value : "") : NULL;
876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898

	git_config_entry_free(entry);

	return ret;
}

int git_config_get_string_buf(
	git_buf *out, const git_config *cfg, const char *name)
{
	git_config_entry *entry;
	int ret;
	const char *str;

	git_buf_sanitize(out);

	ret  = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS);
	str = !ret ? (entry->value ? entry->value : "") : NULL;

	if (str)
		ret = git_buf_puts(out, str);

	git_config_entry_free(entry);

899
	return ret;
900 901
}

902
char *git_config__get_string_force(
903
	const git_config *cfg, const char *key, const char *fallback_value)
904
{
905 906 907
	git_config_entry *entry;
	char *ret;

908
	get_entry(&entry, cfg, key, false, GET_NO_ERRORS);
909 910 911 912
	ret = (entry && entry->value) ? git__strdup(entry->value) : fallback_value ? git__strdup(fallback_value) : NULL;
	git_config_entry_free(entry);

	return ret;
913 914
}

915 916
int git_config__get_bool_force(
	const git_config *cfg, const char *key, int fallback_value)
917
{
918
	int val = fallback_value;
919
	git_config_entry *entry;
920

921
	get_entry(&entry, cfg, key, false, GET_NO_ERRORS);
922

923 924
	if (entry && git_config_parse_bool(&val, entry->value) < 0)
		giterr_clear();
925

926
	git_config_entry_free(entry);
927
	return val;
928 929
}

930 931
int git_config__get_int_force(
	const git_config *cfg, const char *key, int fallback_value)
932
{
933
	int32_t val = (int32_t)fallback_value;
934
	git_config_entry *entry;
Vicent Martí committed
935

936
	get_entry(&entry, cfg, key, false, GET_NO_ERRORS);
937

938 939
	if (entry && git_config_parse_int32(&val, entry->value) < 0)
		giterr_clear();
940

941
	git_config_entry_free(entry);
942
	return (int)val;
943 944
}

945
int git_config_get_multivar_foreach(
946 947
	const git_config *cfg, const char *name, const char *regexp,
	git_config_foreach_cb cb, void *payload)
948
{
949 950 951
	int err, found;
	git_config_iterator *iter;
	git_config_entry *entry;
952

953
	if ((err = git_config_multivar_iterator_new(&iter, cfg, name, regexp)) < 0)
954
		return err;
955

956 957 958
	found = 0;
	while ((err = iter->next(&entry, iter)) == 0) {
		found = 1;
959

960
		if ((err = cb(entry, payload)) != 0) {
961
			giterr_set_after_callback(err);
962
			break;
963
		}
964 965
	}

966
	iter->free(iter);
967 968 969 970 971 972 973
	if (err == GIT_ITEROVER)
		err = 0;

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

	return err;
974 975
}

976
typedef struct {
977
	git_config_iterator parent;
978
	git_config_iterator *iter;
979
	char *name;
980 981
	regex_t regex;
	int have_regex;
982 983
} multivar_iter;

984
static int multivar_iter_next(git_config_entry **entry, git_config_iterator *_iter)
985 986
{
	multivar_iter *iter = (multivar_iter *) _iter;
987
	int error = 0;
988

989 990
	while ((error = iter->iter->next(entry, iter->iter)) == 0) {
		if (git__strcmp(iter->name, (*entry)->name))
991 992
			continue;

993 994
		if (!iter->have_regex)
			return 0;
995

996 997 998
		if (regexec(&iter->regex, (*entry)->value, 0, NULL, 0) == 0)
			return 0;
	}
999

1000
	return error;
1001
}
1002

1003 1004 1005 1006
void multivar_iter_free(git_config_iterator *_iter)
{
	multivar_iter *iter = (multivar_iter *) _iter;

1007
	iter->iter->free(iter->iter);
1008

1009
	git__free(iter->name);
1010 1011
	if (iter->have_regex)
		regfree(&iter->regex);
1012 1013 1014
	git__free(iter);
}

1015
int git_config_multivar_iterator_new(git_config_iterator **out, const git_config *cfg, const char *name, const char *regexp)
1016
{
1017 1018 1019 1020 1021 1022
	multivar_iter *iter = NULL;
	git_config_iterator *inner = NULL;
	int error;

	if ((error = git_config_iterator_new(&inner, cfg)) < 0)
		return error;
1023

1024
	iter = git__calloc(1, sizeof(multivar_iter));
1025 1026
	GITERR_CHECK_ALLOC(iter);

1027 1028
	if ((error = git_config__normalize_name(name, &iter->name)) < 0)
		goto on_error;
1029 1030

	if (regexp != NULL) {
1031
		error = p_regcomp(&iter->regex, regexp, REG_EXTENDED);
1032
		if (error != 0) {
1033 1034 1035 1036 1037 1038 1039
			giterr_set_regex(&iter->regex, error);
			error = -1;
			regfree(&iter->regex);
			goto on_error;
		}

		iter->have_regex = 1;
1040 1041
	}

1042
	iter->iter = inner;
1043
	iter->parent.free = multivar_iter_free;
1044
	iter->parent.next = multivar_iter_next;
1045

1046 1047 1048
	*out = (git_config_iterator *) iter;

	return 0;
1049 1050 1051 1052 1053 1054

on_error:

	inner->free(inner);
	git__free(iter);
	return error;
1055 1056
}

1057 1058
int git_config_set_multivar(git_config *cfg, const char *name, const char *regexp, const char *value)
{
Ben Straub committed
1059
	git_config_backend *file;
1060

1061 1062
	if (get_backend_for_use(&file, cfg, name, BACKEND_USE_DELETE) < 0)
		return GIT_ENOTFOUND;
1063

1064
	return file->set_multivar(file, name, regexp, value);
1065 1066
}

1067 1068 1069 1070
int git_config_delete_multivar(git_config *cfg, const char *name, const char *regexp)
{
	git_config_backend *file;

1071 1072
	if (get_backend_for_use(&file, cfg, name, BACKEND_USE_DELETE) < 0)
		return GIT_ENOTFOUND;
1073 1074 1075 1076

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

1077 1078 1079 1080 1081 1082 1083
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)
{
1084 1085 1086
	if (iter == NULL)
		return;

1087 1088 1089
	iter->free(iter);
}

1090
int git_config_find_global(git_buf *path)
1091
{
1092
	git_buf_sanitize(path);
1093
	return git_sysdir_find_global_file(path, GIT_CONFIG_FILENAME_GLOBAL);
1094 1095
}

1096
int git_config_find_xdg(git_buf *path)
1097
{
1098
	git_buf_sanitize(path);
1099
	return git_sysdir_find_xdg_file(path, GIT_CONFIG_FILENAME_XDG);
1100 1101
}

1102
int git_config_find_system(git_buf *path)
1103
{
1104
	git_buf_sanitize(path);
1105
	return git_sysdir_find_system_file(path, GIT_CONFIG_FILENAME_SYSTEM);
1106 1107
}

1108 1109 1110 1111 1112 1113
int git_config_find_programdata(git_buf *path)
{
	git_buf_sanitize(path);
	return git_sysdir_find_programdata_file(path, GIT_CONFIG_FILENAME_PROGRAMDATA);
}

1114 1115 1116 1117 1118
int git_config__global_location(git_buf *buf)
{
	const git_buf *paths;
	const char *sep, *start;

1119
	if (git_sysdir_get(&paths, GIT_SYSDIR_GLOBAL) < 0)
1120 1121 1122
		return -1;

	/* no paths, so give up */
1123
	if (!paths || !git_buf_len(paths))
1124 1125
		return -1;

1126 1127 1128 1129 1130 1131
	/* 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;
	}
1132

1133
	if (git_buf_set(buf, start, (size_t)(sep - start)) < 0)
1134 1135 1136 1137 1138
		return -1;

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

1139
int git_config_open_default(git_config **out)
1140 1141 1142 1143 1144
{
	int error;
	git_config *cfg = NULL;
	git_buf buf = GIT_BUF_INIT;

1145 1146
	if ((error = git_config_new(&cfg)) < 0)
		return error;
1147

1148
	if (!git_config_find_global(&buf) || !git_config__global_location(&buf)) {
1149 1150
		error = git_config_add_file_ondisk(cfg, buf.ptr,
			GIT_CONFIG_LEVEL_GLOBAL, 0);
1151
	}
1152

1153
	if (!error && !git_config_find_xdg(&buf))
1154 1155
		error = git_config_add_file_ondisk(cfg, buf.ptr,
			GIT_CONFIG_LEVEL_XDG, 0);
1156

1157
	if (!error && !git_config_find_system(&buf))
1158 1159
		error = git_config_add_file_ondisk(cfg, buf.ptr,
			GIT_CONFIG_LEVEL_SYSTEM, 0);
1160

1161 1162 1163 1164
	if (!error && !git_config_find_programdata(&buf))
		error = git_config_add_file_ondisk(cfg, buf.ptr,
			GIT_CONFIG_LEVEL_PROGRAMDATA, 0);

1165 1166
	git_buf_free(&buf);

1167
	if (error) {
1168 1169 1170 1171 1172 1173 1174 1175
		git_config_free(cfg);
		cfg = NULL;
	}

	*out = cfg;

	return error;
}
1176

1177
int git_config_lock(git_transaction **out, git_config *cfg)
1178
{
1179
	int error;
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189
	git_config_backend *file;
	file_internal *internal;

	internal = git_vector_get(&cfg->files, 0);
	if (!internal || !internal->file) {
		giterr_set(GITERR_CONFIG, "cannot lock; the config has no backends/files");
		return -1;
	}
	file = internal->file;

1190 1191 1192 1193
	if ((error = file->lock(file)) < 0)
		return error;

	return git_transaction_config_new(out, cfg);
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
}

int git_config_unlock(git_config *cfg, int commit)
{
	git_config_backend *file;
	file_internal *internal;

	internal = git_vector_get(&cfg->files, 0);
	if (!internal || !internal->file) {
		giterr_set(GITERR_CONFIG, "cannot lock; the config has no backends/files");
		return -1;
	}

	file = internal->file;

	return file->unlock(file, commit);
}

1212 1213 1214
/***********
 * Parsers
 ***********/
1215

1216 1217
int git_config_lookup_map_value(
	int *out,
Ben Straub committed
1218
	const git_cvar_map *maps,
1219 1220 1221 1222 1223 1224 1225 1226 1227
	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
1228
		const git_cvar_map *m = maps + i;
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257

		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:
1258
	giterr_set(GITERR_CONFIG, "failed to map '%s'", value);
1259 1260 1261
	return -1;
}

1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
int git_config_lookup_map_enum(git_cvar_t *type_out, const char **str_out,
			       const git_cvar_map *maps, size_t map_n, int enum_val)
{
	size_t i;

	for (i = 0; i < map_n; i++) {
		const git_cvar_map *m = &maps[i];

		if (m->map_value != enum_val)
			continue;

		*type_out = m->cvar_type;
		*str_out = m->str_match;
		return 0;
	}

	giterr_set(GITERR_CONFIG, "invalid enum value");
	return GIT_ENOTFOUND;
}

1282 1283 1284 1285 1286 1287 1288 1289 1290 1291
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;
	}

1292
	giterr_set(GITERR_CONFIG, "failed to parse '%s' as a boolean value", value);
1293 1294 1295 1296 1297 1298 1299 1300
	return -1;
}

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

1301
	if (!value || git__strtol64(&num, value, &num_end, 0) < 0)
1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
		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:
1335
	giterr_set(GITERR_CONFIG, "failed to parse '%s' as an integer", value ? value : "(null)");
1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354
	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:
1355
	giterr_set(GITERR_CONFIG, "failed to parse '%s' as a 32-bit integer", value ? value : "(null)");
1356 1357
	return -1;
}
1358

1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370
int git_config_parse_path(git_buf *out, const char *value)
{
	assert(out && value);

	git_buf_sanitize(out);

	if (value[0] == '~') {
		if (value[1] != '\0' && value[1] != '/') {
			giterr_set(GITERR_CONFIG, "retrieving a homedir by name is not supported");
			return -1;
		}

1371
		return git_sysdir_expand_global_file(out, value[1] ? &value[2] : NULL);
1372 1373 1374 1375 1376
	}

	return git_buf_sets(out, value);
}

1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
/* 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);
1408
	giterr_set(GITERR_CONFIG, "invalid config item name '%s'", in);
1409 1410 1411
	return GIT_EINVALIDSPEC;
}

1412
struct rename_data {
1413
	git_config *config;
1414 1415
	git_buf *name;
	size_t old_len;
1416 1417 1418 1419 1420 1421
};

static int rename_config_entries_cb(
	const git_config_entry *entry,
	void *payload)
{
1422
	int error = 0;
1423
	struct rename_data *data = (struct rename_data *)payload;
1424
	size_t base_len = git_buf_len(data->name);
1425

1426 1427 1428
	if (base_len > 0 &&
		!(error = git_buf_puts(data->name, entry->name + data->old_len)))
	{
1429
		error = git_config_set_string(
1430
			data->config, git_buf_cstr(data->name), entry->value);
1431

1432
		git_buf_truncate(data->name, base_len);
1433 1434
	}

1435 1436 1437
	if (!error)
		error = git_config_delete_entry(data->config, entry->name);

1438
	return error;
1439 1440 1441 1442 1443 1444 1445 1446
}

int git_config_rename_section(
	git_repository *repo,
	const char *old_section_name,
	const char *new_section_name)
{
	git_config *config;
1447 1448
	git_buf pattern = GIT_BUF_INIT, replace = GIT_BUF_INIT;
	int error = 0;
1449 1450
	struct rename_data data;

1451 1452 1453 1454 1455 1456
	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)
1457 1458
		goto cleanup;

1459 1460 1461 1462 1463
	data.config  = config;
	data.name    = &replace;
	data.old_len = strlen(old_section_name) + 1;

	if ((error = git_buf_join(&replace, '.', new_section_name, "")) < 0)
1464 1465
		goto cleanup;

1466 1467 1468 1469 1470
	if (new_section_name != NULL &&
		(error = git_config_file_normalize_section(
			replace.ptr, strchr(replace.ptr, '.'))) < 0)
	{
		giterr_set(
1471
			GITERR_CONFIG, "invalid config section '%s'", new_section_name);
1472
		goto cleanup;
1473 1474
	}

1475 1476 1477
	error = git_config_foreach_match(
		config, git_buf_cstr(&pattern), rename_config_entries_cb, &data);

1478 1479
cleanup:
	git_buf_free(&pattern);
1480 1481
	git_buf_free(&replace);

1482 1483
	return error;
}
1484

1485
int git_config_init_backend(git_config_backend *backend, unsigned int version)
1486
{
1487 1488 1489
	GIT_INIT_STRUCTURE_FROM_TEMPLATE(
		backend, version, git_config_backend, GIT_CONFIG_BACKEND_INIT);
	return 0;
1490
}