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1483 lines (1142 loc) · 29.9 KB
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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "sysdir.h"
#include "config.h"
#include "git2/config.h"
#include "git2/sys/config.h"
#include "vector.h"
#include "buf_text.h"
#include "config_file.h"
#include "transaction.h"
#if GIT_WIN32
# include <windows.h>
#endif
#include <ctype.h>
void git_config_entry_free(git_config_entry *entry)
{
if (!entry)
return;
entry->free(entry);
}
typedef struct {
git_refcount rc;
git_config_backend *file;
git_config_level_t level;
} file_internal;
static void file_internal_free(file_internal *internal)
{
git_config_backend *file;
file = internal->file;
file->free(file);
git__free(internal);
}
static void config_free(git_config *cfg)
{
size_t i;
file_internal *internal;
for (i = 0; i < cfg->files.length; ++i) {
internal = git_vector_get(&cfg->files, i);
GIT_REFCOUNT_DEC(internal, file_internal_free);
}
git_vector_free(&cfg->files);
git__memzero(cfg, sizeof(*cfg));
git__free(cfg);
}
void git_config_free(git_config *cfg)
{
if (cfg == NULL)
return;
GIT_REFCOUNT_DEC(cfg, config_free);
}
static int config_backend_cmp(const void *a, const void *b)
{
const file_internal *bk_a = (const file_internal *)(a);
const file_internal *bk_b = (const file_internal *)(b);
return bk_b->level - bk_a->level;
}
int git_config_new(git_config **out)
{
git_config *cfg;
cfg = git__malloc(sizeof(git_config));
GITERR_CHECK_ALLOC(cfg);
memset(cfg, 0x0, sizeof(git_config));
if (git_vector_init(&cfg->files, 3, config_backend_cmp) < 0) {
git__free(cfg);
return -1;
}
*out = cfg;
GIT_REFCOUNT_INC(cfg);
return 0;
}
int git_config_add_file_ondisk(
git_config *cfg,
const char *path,
git_config_level_t level,
int force)
{
git_config_backend *file = NULL;
struct stat st;
int res;
assert(cfg && path);
res = p_stat(path, &st);
if (res < 0 && errno != ENOENT) {
giterr_set(GITERR_CONFIG, "failed to stat '%s'", path);
return -1;
}
if (git_config_file__ondisk(&file, path) < 0)
return -1;
if ((res = git_config_add_backend(cfg, file, level, force)) < 0) {
/*
* free manually; the file is not owned by the config
* instance yet and will not be freed on cleanup
*/
file->free(file);
return res;
}
return 0;
}
int git_config_open_ondisk(git_config **out, const char *path)
{
int error;
git_config *config;
*out = NULL;
if (git_config_new(&config) < 0)
return -1;
if ((error = git_config_add_file_ondisk(config, path, GIT_CONFIG_LEVEL_LOCAL, 0)) < 0)
git_config_free(config);
else
*out = config;
return error;
}
int git_config_snapshot(git_config **out, git_config *in)
{
int error = 0;
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)
break;
if ((error = git_config_add_backend(config, b, internal->level, 0)) < 0) {
b->free(b);
break;
}
}
if (error < 0)
git_config_free(config);
else
*out = config;
return error;
}
static int find_internal_file_by_level(
file_internal **internal_out,
const git_config *cfg,
git_config_level_t level)
{
int pos = -1;
file_internal *internal;
size_t i;
/* 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) {
if (internal->level == level)
pos = (int)i;
}
}
if (pos == -1) {
giterr_set(GITERR_CONFIG,
"no config file exists for the given level '%i'", (int)level);
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);
giterr_set(GITERR_CONFIG, "a file with the same level (%i) has already been added to the config", (int)(*old)->level);
return GIT_EEXISTS;
}
static void try_remove_existing_file_internal(
git_config *cfg,
git_config_level_t level)
{
int pos = -1;
file_internal *internal;
size_t i;
git_vector_foreach(&cfg->files, i, internal) {
if (internal->level == level)
pos = (int)i;
}
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,
git_config_level_t level,
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;
}
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);
}
int git_config_open_level(
git_config **cfg_out,
const git_config *cfg_parent,
git_config_level_t level)
{
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;
}
int git_config_add_backend(
git_config *cfg,
git_config_backend *file,
git_config_level_t level,
int force)
{
file_internal *internal;
int result;
assert(cfg && file);
GITERR_CHECK_VERSION(file, GIT_CONFIG_BACKEND_VERSION, "git_config_backend");
if ((result = file->open(file, level)) < 0)
return result;
internal = git__malloc(sizeof(file_internal));
GITERR_CHECK_ALLOC(internal);
memset(internal, 0x0, sizeof(file_internal));
internal->file = file;
internal->level = level;
if ((result = git_config__add_internal(cfg, internal, level, force)) < 0) {
git__free(internal);
return result;
}
return 0;
}
/*
* Loop over all the variables
*/
typedef struct {
git_config_iterator parent;
git_config_iterator *current;
const git_config *cfg;
regex_t regex;
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;
error = iter->current->next(entry, iter->current);
/* If this backend is empty, then keep going */
if (error == GIT_ITEROVER)
continue;
return error;
} while(1);
return GIT_ITEROVER;
}
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;
}
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);
}
static void all_iter_glob_free(git_config_iterator *_iter)
{
all_iter *iter = (all_iter *) _iter;
regfree(&iter->regex);
all_iter_free(_iter);
}
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;
}
int git_config_iterator_glob_new(git_config_iterator **out, const git_config *cfg, const char *regexp)
{
all_iter *iter;
int result;
if (regexp == NULL)
return git_config_iterator_new(out, cfg);
iter = git__calloc(1, sizeof(all_iter));
GITERR_CHECK_ALLOC(iter);
if ((result = p_regcomp(&iter->regex, regexp, REG_EXTENDED)) != 0) {
giterr_set_regex(&iter->regex, result);
git__free(iter);
return -1;
}
iter->parent.next = all_iter_glob_next;
iter->parent.free = all_iter_glob_free;
iter->i = cfg->files.length;
iter->cfg = cfg;
*out = (git_config_iterator *) iter;
return 0;
}
int git_config_foreach(
const git_config *cfg, git_config_foreach_cb cb, void *payload)
{
return git_config_foreach_match(cfg, NULL, cb, payload);
}
int git_config_backend_foreach_match(
git_config_backend *backend,
const char *regexp,
git_config_foreach_cb cb,
void *payload)
{
git_config_entry *entry;
git_config_iterator* iter;
regex_t regex;
int error = 0;
if (regexp != NULL) {
if ((error = p_regcomp(®ex, regexp, REG_EXTENDED)) != 0) {
giterr_set_regex(®ex, error);
regfree(®ex);
return -1;
}
}
if ((error = backend->iterator(&iter, backend)) < 0) {
iter = NULL;
return -1;
}
while (!(iter->next(&entry, iter) < 0)) {
/* skip non-matching keys if regexp was provided */
if (regexp && regexec(®ex, entry->name, 0, NULL, 0) != 0)
continue;
/* abort iterator on non-zero return value */
if ((error = cb(entry, payload)) != 0) {
giterr_set_after_callback(error);
break;
}
}
if (regexp != NULL)
regfree(®ex);
iter->free(iter);
return error;
}
int git_config_foreach_match(
const git_config *cfg,
const char *regexp,
git_config_foreach_cb cb,
void *payload)
{
int error;
git_config_iterator *iter;
git_config_entry *entry;
if ((error = git_config_iterator_glob_new(&iter, cfg, regexp)) < 0)
return error;
while (!(error = git_config_next(&entry, iter))) {
if ((error = cb(entry, payload)) != 0) {
giterr_set_after_callback(error);
break;
}
}
git_config_iterator_free(iter);
if (error == GIT_ITEROVER)
error = 0;
return error;
}
/**************
* Setters
**************/
static int config_error_nofiles(const char *name)
{
giterr_set(GITERR_CONFIG,
"cannot set value for '%s' when no config files exist", name);
return GIT_ENOTFOUND;
}
int git_config_delete_entry(git_config *cfg, const char *name)
{
git_config_backend *file;
file_internal *internal;
internal = git_vector_get(&cfg->files, 0);
if (!internal || !internal->file)
return config_error_nofiles(name);
file = internal->file;
return file->del(file, name);
}
int git_config_set_int64(git_config *cfg, const char *name, int64_t value)
{
char str_value[32]; /* All numbers should fit in here */
p_snprintf(str_value, sizeof(str_value), "%" PRId64, value);
return git_config_set_string(cfg, name, str_value);
}
int git_config_set_int32(git_config *cfg, const char *name, int32_t value)
{
return git_config_set_int64(cfg, name, (int64_t)value);
}
int git_config_set_bool(git_config *cfg, const char *name, int value)
{
return git_config_set_string(cfg, name, value ? "true" : "false");
}
int git_config_set_string(git_config *cfg, const char *name, const char *value)
{
int error;
git_config_backend *file;
file_internal *internal;
if (!value) {
giterr_set(GITERR_CONFIG, "the value to set cannot be NULL");
return -1;
}
internal = git_vector_get(&cfg->files, 0);
if (!internal || !internal->file)
return config_error_nofiles(name);
file = internal->file;
error = file->set(file, name, value);
if (!error && GIT_REFCOUNT_OWNER(cfg) != NULL)
git_repository__cvar_cache_clear(GIT_REFCOUNT_OWNER(cfg));
return error;
}
int git_config__update_entry(
git_config *config,
const char *key,
const char *value,
bool overwrite_existing,
bool only_if_existing)
{
int error = 0;
git_config_entry *ce = NULL;
if ((error = git_config__lookup_entry(&ce, config, key, false)) < 0)
return error;
if (!ce && only_if_existing) /* entry doesn't exist */
return 0;
if (ce && !overwrite_existing) /* entry would be overwritten */
return 0;
if (value && ce && ce->value && !strcmp(ce->value, value)) /* no change */
return 0;
if (!value && (!ce || !ce->value)) /* asked to delete absent entry */
return 0;
if (!value)
error = git_config_delete_entry(config, key);
else
error = git_config_set_string(config, key, value);
git_config_entry_free(ce);
return error;
}
/***********
* Getters
***********/
static int config_error_notfound(const char *name)
{
giterr_set(GITERR_CONFIG, "config value '%s' was not found", name);
return GIT_ENOTFOUND;
}
enum {
GET_ALL_ERRORS = 0,
GET_NO_MISSING = 1,
GET_NO_ERRORS = 2
};
static int get_entry(
git_config_entry **out,
const git_config *cfg,
const char *name,
bool normalize_name,
int want_errors)
{
int res = GIT_ENOTFOUND;
const char *key = name;
char *normalized = NULL;
size_t i;
file_internal *internal;
*out = NULL;
if (normalize_name) {
if ((res = git_config__normalize_name(name, &normalized)) < 0)
goto cleanup;
key = normalized;
}
res = GIT_ENOTFOUND;
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(
git_config_entry **out, const git_config *cfg, const char *name)
{
return get_entry(out, cfg, name, true, GET_ALL_ERRORS);
}
int git_config__lookup_entry(
git_config_entry **out,
const git_config *cfg,
const char *key,
bool no_errors)
{
return get_entry(
out, cfg, key, false, no_errors ? GET_NO_ERRORS : GET_NO_MISSING);
}
int git_config_get_mapped(
int *out,
const git_config *cfg,
const char *name,
const git_cvar_map *maps,
size_t map_n)
{
git_config_entry *entry;
int ret;
if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
return ret;
ret = git_config_lookup_map_value(out, maps, map_n, entry->value);
git_config_entry_free(entry);
return ret;
}
int git_config_get_int64(int64_t *out, const git_config *cfg, const char *name)
{
git_config_entry *entry;
int ret;
if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
return ret;
ret = git_config_parse_int64(out, entry->value);
git_config_entry_free(entry);
return ret;
}
int git_config_get_int32(int32_t *out, const git_config *cfg, const char *name)
{
git_config_entry *entry;
int ret;
if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
return ret;
ret = git_config_parse_int32(out, entry->value);
git_config_entry_free(entry);
return ret;
}
int git_config_get_bool(int *out, const git_config *cfg, const char *name)
{
git_config_entry *entry;
int ret;
if ((ret = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
return ret;
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;
}
int git_config_get_path(git_buf *out, const git_config *cfg, const char *name)
{
git_config_entry *entry;
int error;
if ((error = get_entry(&entry, cfg, name, true, GET_ALL_ERRORS)) < 0)
return error;
error = git_config_parse_path(out, entry->value);
git_config_entry_free(entry);
return error;
}
int git_config_get_string(
const char **out, const git_config *cfg, const char *name)
{
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);
*out = !ret ? (entry->value ? entry->value : "") : NULL;
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);
return ret;
}
char *git_config__get_string_force(
const git_config *cfg, const char *key, const char *fallback_value)
{
git_config_entry *entry;
char *ret;
get_entry(&entry, cfg, key, false, GET_NO_ERRORS);
ret = (entry && entry->value) ? git__strdup(entry->value) : fallback_value ? git__strdup(fallback_value) : NULL;
git_config_entry_free(entry);
return ret;
}
int git_config__get_bool_force(
const git_config *cfg, const char *key, int fallback_value)
{
int val = fallback_value;
git_config_entry *entry;
get_entry(&entry, cfg, key, false, GET_NO_ERRORS);
if (entry && git_config_parse_bool(&val, entry->value) < 0)
giterr_clear();
git_config_entry_free(entry);
return val;
}
int git_config__get_int_force(
const git_config *cfg, const char *key, int fallback_value)
{
int32_t val = (int32_t)fallback_value;
git_config_entry *entry;
get_entry(&entry, cfg, key, false, GET_NO_ERRORS);
if (entry && git_config_parse_int32(&val, entry->value) < 0)
giterr_clear();
git_config_entry_free(entry);
return (int)val;
}
int git_config_get_multivar_foreach(
const git_config *cfg, const char *name, const char *regexp,
git_config_foreach_cb cb, void *payload)
{
int err, found;
git_config_iterator *iter;
git_config_entry *entry;
if ((err = git_config_multivar_iterator_new(&iter, cfg, name, regexp)) < 0)
return err;
found = 0;
while ((err = iter->next(&entry, iter)) == 0) {
found = 1;
if ((err = cb(entry, payload)) != 0) {
giterr_set_after_callback(err);
break;
}
}
iter->free(iter);
if (err == GIT_ITEROVER)
err = 0;
if (found == 0 && err == 0)
err = config_error_notfound(name);
return err;
}
typedef struct {
git_config_iterator parent;
git_config_iterator *iter;
char *name;
regex_t regex;
int have_regex;
} multivar_iter;
static int multivar_iter_next(git_config_entry **entry, git_config_iterator *_iter)
{
multivar_iter *iter = (multivar_iter *) _iter;
int error = 0;
while ((error = iter->iter->next(entry, iter->iter)) == 0) {
if (git__strcmp(iter->name, (*entry)->name))
continue;
if (!iter->have_regex)
return 0;
if (regexec(&iter->regex, (*entry)->value, 0, NULL, 0) == 0)
return 0;
}
return error;
}
void multivar_iter_free(git_config_iterator *_iter)
{
multivar_iter *iter = (multivar_iter *) _iter;
iter->iter->free(iter->iter);
git__free(iter->name);
if (iter->have_regex)
regfree(&iter->regex);
git__free(iter);
}
int git_config_multivar_iterator_new(git_config_iterator **out, const git_config *cfg, const char *name, const char *regexp)
{
multivar_iter *iter = NULL;
git_config_iterator *inner = NULL;
int error;
if ((error = git_config_iterator_new(&inner, cfg)) < 0)
return error;
iter = git__calloc(1, sizeof(multivar_iter));
GITERR_CHECK_ALLOC(iter);
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