config.c 30.9 KB
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/*
Edward Thomson committed
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 * Copyright (C) the libgit2 contributors. All rights reserved.
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 *
Vicent Marti committed
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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 "config.h"
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#include "git2/config.h"
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#include "git2/sys/config.h"
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#include "buf_text.h"
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#include "config_backend.h"
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#include "regexp.h"
#include "sysdir.h"
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#include "transaction.h"
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#include "vector.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 *backend;
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	git_config_level_t level;
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} backend_internal;
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static void backend_internal_free(backend_internal *internal)
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{
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	git_config_backend *backend;
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	backend = internal->backend;
	backend->free(backend);
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	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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	backend_internal *internal;
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	for (i = 0; i < cfg->backends.length; ++i) {
		internal = git_vector_get(&cfg->backends, i);
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		GIT_REFCOUNT_DEC(internal, backend_internal_free);
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	}
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	git_vector_free(&cfg->backends);
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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 backend_internal *bk_a = (const backend_internal *)(a);
	const backend_internal *bk_b = (const backend_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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	GIT_ERROR_CHECK_ALLOC(cfg);
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	memset(cfg, 0x0, sizeof(git_config));

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	if (git_vector_init(&cfg->backends, 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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	const git_repository *repo,
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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);
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	if (res < 0 && errno != ENOENT && errno != ENOTDIR) {
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		git_error_set(GIT_ERROR_CONFIG, "failed to stat '%s'", path);
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		return -1;
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	}

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	if (git_config_backend_from_file(&file, path) < 0)
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		return -1;
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	if ((res = git_config_add_backend(cfg, file, level, repo, 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, NULL, 0)) < 0)
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		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;
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	backend_internal *internal;
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	git_config *config;

	*out = NULL;

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

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

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		if ((error = internal->backend->snapshot(&b, internal->backend)) < 0)
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			break;
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		if ((error = git_config_add_backend(config, b, internal->level, NULL, 0)) < 0) {
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			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_backend_by_level(
	backend_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;
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	backend_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 backend
	 * which has the highest level. As config backends are stored in a vector
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	 * sorted by decreasing order of level, getting the backend at position 0
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	 * will do the job.
	 */
	if (level == GIT_CONFIG_HIGHEST_LEVEL) {
		pos = 0;
	} else {
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		git_vector_foreach(&cfg->backends, i, internal) {
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			if (internal->level == level)
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				pos = (int)i;
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		}
	}

	if (pos == -1) {
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		git_error_set(GIT_ERROR_CONFIG,
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			"no configuration exists for the given level '%i'", (int)level);
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		return GIT_ENOTFOUND;
	}

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	*out = git_vector_get(&cfg->backends, pos);
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	return 0;
}

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

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	git_error_set(GIT_ERROR_CONFIG, "there already exists a configuration for the given level (%i)", (int)(*old)->level);
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	return GIT_EEXISTS;
}

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

	if (pos == -1)
		return;

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	internal = git_vector_get(&cfg->backends, pos);
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	if (git_vector_remove(&cfg->backends, pos) < 0)
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		return;

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	GIT_REFCOUNT_DEC(internal, backend_internal_free);
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}

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

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	/* delete existing config backend for level if it exists */
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	if (force)
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		try_remove_existing_backend(cfg, level);
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	if ((result = git_vector_insert_sorted(&cfg->backends,
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			internal, &duplicate_level)) < 0)
		return result;

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	git_vector_sort(&cfg->backends);
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	internal->backend->cfg = cfg;
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	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;
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	backend_internal *internal;
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	int res;

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	if ((res = find_backend_by_level(&internal, cfg_parent, level)) < 0)
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		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 *backend,
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	git_config_level_t level,
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	const git_repository *repo,
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	int force)
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{
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	backend_internal *internal;
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	int result;
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	assert(cfg && backend);
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	GIT_ERROR_CHECK_VERSION(backend, GIT_CONFIG_BACKEND_VERSION, "git_config_backend");
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	if ((result = backend->open(backend, level, repo)) < 0)
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		return result;
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	internal = git__malloc(sizeof(backend_internal));
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	GIT_ERROR_CHECK_ALLOC(internal);
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	memset(internal, 0x0, sizeof(backend_internal));
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	internal->backend = backend;
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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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	git_regexp 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)
{
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	backend_internal *internal;
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	for (; i > 0; --i) {
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		internal = git_vector_get(&cfg->backends, i - 1);
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		if (!internal || !internal->backend)
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			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;
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	backend_internal *internal;
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	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;

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		internal = git_vector_get(&iter->cfg->backends, i - 1);
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		backend = internal->backend;
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		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 */
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		if (git_regexp_match(&iter->regex, (*entry)->name) != 0)
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			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;

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	git_regexp_dispose(&iter->regex);
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	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));
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	GIT_ERROR_CHECK_ALLOC(iter);
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	iter->parent.free = all_iter_free;
	iter->parent.next = all_iter_next;

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	iter->i = cfg->backends.length;
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	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));
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	GIT_ERROR_CHECK_ALLOC(iter);
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	if ((result = git_regexp_compile(&iter->regex, regexp, 0)) < 0) {
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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->backends.length;
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	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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	git_regexp regex;
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	int error = 0;
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	assert(backend && cb);

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	if (regexp && git_regexp_compile(&regex, regexp, 0) < 0)
		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 && git_regexp_match(&regex, entry->name) != 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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			git_error_set_after_callback(error);
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			break;
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		}
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	}

	if (regexp != NULL)
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		git_regexp_dispose(&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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			git_error_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;
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	backend_internal *backend;
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	*out = NULL;

597
	if (git_vector_length(&cfg->backends) == 0) {
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		git_error_set(GIT_ERROR_CONFIG,
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			"cannot %s value for '%s' when no config backends exist",
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			uses[use], name);
		return GIT_ENOTFOUND;
	}

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

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	git_error_set(GIT_ERROR_CONFIG,
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		"cannot %s value for '%s' when all config backends are readonly",
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		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)
{
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	git_config_backend *backend;
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	if (get_backend_for_use(&backend, cfg, name, BACKEND_USE_DELETE) < 0)
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		return GIT_ENOTFOUND;
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	return backend->del(backend, name);
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}

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int git_config_set_int64(git_config *cfg, const char *name, int64_t value)
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{
Vicent Marti committed
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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 *backend;
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649
	if (!value) {
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		git_error_set(GIT_ERROR_CONFIG, "the value to set cannot be NULL");
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		return -1;
	}

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	if (get_backend_for_use(&backend, cfg, name, BACKEND_USE_SET) < 0)
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		return GIT_ENOTFOUND;
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	error = backend->set(backend, name, value);
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	if (!error && GIT_REFCOUNT_OWNER(cfg) != NULL)
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		git_repository__configmap_lookup_cache_clear(GIT_REFCOUNT_OWNER(cfg));
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	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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	git_error_set(GIT_ERROR_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;
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	backend_internal *internal;
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	*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->backends, i, internal) {
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		if (!internal || !internal->backend)
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			continue;

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		res = internal->backend->get(internal->backend, key, out);
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		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)) {
749
		git_error_clear();
750 751 752 753 754 755 756
		res = 0;
	}

	return res;
}

int git_config_get_entry(
757
	git_config_entry **out, const git_config *cfg, const char *name)
758 759 760 761 762
{
	return get_entry(out, cfg, name, true, GET_ALL_ERRORS);
}

int git_config__lookup_entry(
763
	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,
776
	const git_configmap *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;
789 790
}

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
	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;
836
	backend_internal *internal;
837

838
	git_vector_foreach(&cfg->backends, i, internal) {
839
		if (!internal || !internal->backend)
840 841
			continue;

842
		if (!internal->backend->readonly)
843 844 845 846
			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
	git_config_entry *entry;
	int ret;

	if (!is_readonly(cfg)) {
870
		git_error_set(GIT_ERROR_CONFIG, "get_string called on a live config object");
871 872 873 874
		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
	if (entry && git_config_parse_bool(&val, entry->value) < 0)
924
		git_error_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
	if (entry && git_config_parse_int32(&val, entry->value) < 0)
939
		git_error_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
			git_error_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
	git_regexp regex;
981
	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
		if (git_regexp_match(&iter->regex, (*entry)->value) == 0)
997 998
			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
	if (iter->have_regex)
1011
		git_regexp_dispose(&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
	GIT_ERROR_CHECK_ALLOC(iter);
1026

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

	if (regexp != NULL) {
1031
		if ((error = git_regexp_compile(&iter->regex, regexp, 0)) < 0)
1032 1033 1034
			goto on_error;

		iter->have_regex = 1;
1035 1036
	}

1037
	iter->iter = inner;
1038
	iter->parent.free = multivar_iter_free;
1039
	iter->parent.next = multivar_iter_next;
1040

1041 1042 1043
	*out = (git_config_iterator *) iter;

	return 0;
1044 1045 1046 1047 1048 1049

on_error:

	inner->free(inner);
	git__free(iter);
	return error;
1050 1051
}

1052 1053
int git_config_set_multivar(git_config *cfg, const char *name, const char *regexp, const char *value)
{
1054
	git_config_backend *backend;
1055

1056
	if (get_backend_for_use(&backend, cfg, name, BACKEND_USE_DELETE) < 0)
1057
		return GIT_ENOTFOUND;
1058

1059
	return backend->set_multivar(backend, name, regexp, value);
1060 1061
}

1062 1063
int git_config_delete_multivar(git_config *cfg, const char *name, const char *regexp)
{
1064
	git_config_backend *backend;
1065

1066
	if (get_backend_for_use(&backend, cfg, name, BACKEND_USE_DELETE) < 0)
1067
		return GIT_ENOTFOUND;
1068

1069
	return backend->del_multivar(backend, name, regexp);
1070 1071
}

1072 1073 1074 1075 1076 1077 1078
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)
{
1079 1080 1081
	if (iter == NULL)
		return;

1082 1083 1084
	iter->free(iter);
}

1085
int git_config_find_global(git_buf *path)
1086
{
1087
	git_buf_sanitize(path);
1088
	return git_sysdir_find_global_file(path, GIT_CONFIG_FILENAME_GLOBAL);
1089 1090
}

1091
int git_config_find_xdg(git_buf *path)
1092
{
1093
	git_buf_sanitize(path);
1094
	return git_sysdir_find_xdg_file(path, GIT_CONFIG_FILENAME_XDG);
1095 1096
}

1097
int git_config_find_system(git_buf *path)
1098
{
1099
	git_buf_sanitize(path);
1100
	return git_sysdir_find_system_file(path, GIT_CONFIG_FILENAME_SYSTEM);
1101 1102
}

1103 1104
int git_config_find_programdata(git_buf *path)
{
1105 1106
	int ret;

1107
	git_buf_sanitize(path);
1108 1109 1110 1111 1112 1113
	ret = git_sysdir_find_programdata_file(path,
					       GIT_CONFIG_FILENAME_PROGRAMDATA);
	if (ret != GIT_OK)
		return ret;

	return git_path_validate_system_file_ownership(path->ptr);
1114 1115
}

1116 1117 1118 1119 1120
int git_config__global_location(git_buf *buf)
{
	const git_buf *paths;
	const char *sep, *start;

1121
	if (git_sysdir_get(&paths, GIT_SYSDIR_GLOBAL) < 0)
1122 1123 1124
		return -1;

	/* no paths, so give up */
1125
	if (!paths || !git_buf_len(paths))
1126 1127
		return -1;

1128 1129 1130 1131 1132 1133
	/* 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;
	}
1134

1135
	if (git_buf_set(buf, start, (size_t)(sep - start)) < 0)
1136 1137 1138 1139 1140
		return -1;

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

1141
int git_config_open_default(git_config **out)
1142 1143 1144 1145 1146
{
	int error;
	git_config *cfg = NULL;
	git_buf buf = GIT_BUF_INIT;

1147 1148
	if ((error = git_config_new(&cfg)) < 0)
		return error;
1149

1150
	if (!git_config_find_global(&buf) || !git_config__global_location(&buf)) {
1151
		error = git_config_add_file_ondisk(cfg, buf.ptr,
1152
			GIT_CONFIG_LEVEL_GLOBAL, NULL, 0);
1153
	}
1154

1155
	if (!error && !git_config_find_xdg(&buf))
1156
		error = git_config_add_file_ondisk(cfg, buf.ptr,
1157
			GIT_CONFIG_LEVEL_XDG, NULL, 0);
1158

1159
	if (!error && !git_config_find_system(&buf))
1160
		error = git_config_add_file_ondisk(cfg, buf.ptr,
1161
			GIT_CONFIG_LEVEL_SYSTEM, NULL, 0);
1162

1163 1164
	if (!error && !git_config_find_programdata(&buf))
		error = git_config_add_file_ondisk(cfg, buf.ptr,
1165
			GIT_CONFIG_LEVEL_PROGRAMDATA, NULL, 0);
1166

1167
	git_buf_dispose(&buf);
1168

1169
	if (error) {
1170 1171 1172 1173 1174 1175 1176 1177
		git_config_free(cfg);
		cfg = NULL;
	}

	*out = cfg;

	return error;
}
1178

1179
int git_config_lock(git_transaction **out, git_config *cfg)
1180
{
1181
	int error;
1182
	git_config_backend *backend;
1183
	backend_internal *internal;
1184

1185 1186
	assert(cfg);

1187
	internal = git_vector_get(&cfg->backends, 0);
1188
	if (!internal || !internal->backend) {
1189
		git_error_set(GIT_ERROR_CONFIG, "cannot lock; the config has no backends");
1190 1191
		return -1;
	}
1192
	backend = internal->backend;
1193

1194
	if ((error = backend->lock(backend)) < 0)
1195 1196 1197
		return error;

	return git_transaction_config_new(out, cfg);
1198 1199 1200 1201
}

int git_config_unlock(git_config *cfg, int commit)
{
1202
	git_config_backend *backend;
1203
	backend_internal *internal;
1204

1205 1206
	assert(cfg);

1207
	internal = git_vector_get(&cfg->backends, 0);
1208
	if (!internal || !internal->backend) {
1209
		git_error_set(GIT_ERROR_CONFIG, "cannot lock; the config has no backends");
1210 1211 1212
		return -1;
	}

1213
	backend = internal->backend;
1214

1215
	return backend->unlock(backend, commit);
1216 1217
}

1218 1219 1220
/***********
 * Parsers
 ***********/
1221

1222 1223
int git_config_lookup_map_value(
	int *out,
1224
	const git_configmap *maps,
1225 1226 1227 1228 1229 1230 1231 1232 1233
	size_t map_n,
	const char *value)
{
	size_t i;

	if (!value)
		goto fail_parse;

	for (i = 0; i < map_n; ++i) {
1234
		const git_configmap *m = maps + i;
1235

1236 1237 1238
		switch (m->type) {
		case GIT_CONFIGMAP_FALSE:
		case GIT_CONFIGMAP_TRUE: {
1239 1240 1241
			int bool_val;

			if (git__parse_bool(&bool_val, value) == 0 &&
1242
				bool_val == (int)m->type) {
1243 1244 1245 1246 1247 1248
				*out = m->map_value;
				return 0;
			}
			break;
		}

1249
		case GIT_CONFIGMAP_INT32:
1250 1251 1252 1253
			if (git_config_parse_int32(out, value) == 0)
				return 0;
			break;

1254
		case GIT_CONFIGMAP_STRING:
1255 1256 1257 1258 1259 1260 1261 1262 1263
			if (strcasecmp(value, m->str_match) == 0) {
				*out = m->map_value;
				return 0;
			}
			break;
		}
	}

fail_parse:
1264
	git_error_set(GIT_ERROR_CONFIG, "failed to map '%s'", value);
1265 1266 1267
	return -1;
}

1268 1269
int git_config_lookup_map_enum(git_configmap_t *type_out, const char **str_out,
			       const git_configmap *maps, size_t map_n, int enum_val)
1270 1271 1272 1273
{
	size_t i;

	for (i = 0; i < map_n; i++) {
1274
		const git_configmap *m = &maps[i];
1275 1276 1277 1278

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

1279
		*type_out = m->type;
1280 1281 1282 1283
		*str_out = m->str_match;
		return 0;
	}

1284
	git_error_set(GIT_ERROR_CONFIG, "invalid enum value");
1285 1286 1287
	return GIT_ENOTFOUND;
}

1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
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;
	}

1298
	git_error_set(GIT_ERROR_CONFIG, "failed to parse '%s' as a boolean value", value);
1299 1300 1301 1302 1303 1304 1305 1306
	return -1;
}

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

1307
	if (!value || git__strntol64(&num, value, strlen(value), &num_end, 0) < 0)
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 1335 1336 1337 1338 1339 1340
		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:
1341
	git_error_set(GIT_ERROR_CONFIG, "failed to parse '%s' as an integer", value ? value : "(null)");
1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
	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:
1361
	git_error_set(GIT_ERROR_CONFIG, "failed to parse '%s' as a 32-bit integer", value ? value : "(null)");
1362 1363
	return -1;
}
1364

1365 1366 1367 1368 1369 1370 1371 1372
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] != '/') {
1373
			git_error_set(GIT_ERROR_CONFIG, "retrieving a homedir by name is not supported");
1374 1375 1376
			return -1;
		}

1377
		return git_sysdir_expand_global_file(out, value[1] ? &value[2] : NULL);
1378 1379 1380 1381 1382
	}

	return git_buf_sets(out, value);
}

1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406
static int normalize_section(char *start, char *end)
{
	char *scan;

	if (start == end)
		return GIT_EINVALIDSPEC;

	/* Validate and downcase range */
	for (scan = start; *scan; ++scan) {
		if (end && scan >= end)
			break;
		if (isalnum(*scan))
			*scan = (char)git__tolower(*scan);
		else if (*scan != '-' || scan == start)
			return GIT_EINVALIDSPEC;
	}

	if (scan == start)
		return GIT_EINVALIDSPEC;

	return 0;
}


1407 1408 1409 1410 1411 1412 1413 1414
/* 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);
1415
	GIT_ERROR_CHECK_ALLOC(name);
1416 1417 1418 1419 1420 1421 1422 1423

	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 */
1424 1425
	if (normalize_section(name, fdot) < 0 ||
	    normalize_section(ldot + 1, NULL) < 0)
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437
		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);
1438
	git_error_set(GIT_ERROR_CONFIG, "invalid config item name '%s'", in);
1439 1440 1441
	return GIT_EINVALIDSPEC;
}

1442
struct rename_data {
1443
	git_config *config;
1444 1445
	git_buf *name;
	size_t old_len;
1446 1447 1448 1449 1450 1451
};

static int rename_config_entries_cb(
	const git_config_entry *entry,
	void *payload)
{
1452
	int error = 0;
1453
	struct rename_data *data = (struct rename_data *)payload;
1454
	size_t base_len = git_buf_len(data->name);
1455

1456 1457 1458
	if (base_len > 0 &&
		!(error = git_buf_puts(data->name, entry->name + data->old_len)))
	{
1459
		error = git_config_set_string(
1460
			data->config, git_buf_cstr(data->name), entry->value);
1461

1462
		git_buf_truncate(data->name, base_len);
1463 1464
	}

1465 1466 1467
	if (!error)
		error = git_config_delete_entry(data->config, entry->name);

1468
	return error;
1469 1470 1471 1472 1473 1474 1475 1476
}

int git_config_rename_section(
	git_repository *repo,
	const char *old_section_name,
	const char *new_section_name)
{
	git_config *config;
1477 1478
	git_buf pattern = GIT_BUF_INIT, replace = GIT_BUF_INIT;
	int error = 0;
1479 1480
	struct rename_data data;

1481 1482 1483 1484 1485 1486
	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)
1487 1488
		goto cleanup;

1489 1490 1491 1492 1493
	data.config  = config;
	data.name    = &replace;
	data.old_len = strlen(old_section_name) + 1;

	if ((error = git_buf_join(&replace, '.', new_section_name, "")) < 0)
1494 1495
		goto cleanup;

1496
	if (new_section_name != NULL &&
1497
	    (error = normalize_section(replace.ptr, strchr(replace.ptr, '.'))) < 0)
1498
	{
1499 1500
		git_error_set(
			GIT_ERROR_CONFIG, "invalid config section '%s'", new_section_name);
1501
		goto cleanup;
1502 1503
	}

1504 1505 1506
	error = git_config_foreach_match(
		config, git_buf_cstr(&pattern), rename_config_entries_cb, &data);

1507
cleanup:
1508 1509
	git_buf_dispose(&pattern);
	git_buf_dispose(&replace);
1510

1511 1512
	return error;
}
1513

1514
int git_config_init_backend(git_config_backend *backend, unsigned int version)
1515
{
1516 1517 1518
	GIT_INIT_STRUCTURE_FROM_TEMPLATE(
		backend, version, git_config_backend, GIT_CONFIG_BACKEND_INIT);
	return 0;
1519
}