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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 "config_backend.h"

#include "config.h"

#include "config_entries.h"

typedef struct {

git_config_backend parent;

git_mutex values_mutex;

git_config_entries *entries;

git_config_backend *source;

} config_snapshot_backend;

static int config_error_readonly(void)

{

git_error_set(GIT_ERROR_CONFIG, "this backend is read-only");

return -1;

}

static int config_snapshot_iterator(

git_config_iterator **iter,

struct git_config_backend *backend)

{

config_snapshot_backend *b = GIT_CONTAINER_OF(backend, config_snapshot_backend, parent);

git_config_entries *entries = NULL;

int error;

if ((error = git_config_entries_dup(&entries, b->entries)) < 0 ||

(error = git_config_entries_iterator_new(iter, entries)) < 0)

goto out;

out:

/* Let iterator delete duplicated entries when it's done */

git_config_entries_free(entries);

return error;

}

/* release the map containing the entry as an equivalent to freeing it */

static void config_snapshot_entry_free(git_config_entry *entry)

{

git_config_entries *entries = (git_config_entries *) entry->payload;

git_config_entries_free(entries);

}

static int config_snapshot_get(git_config_backend *cfg, const char *key, git_config_entry **out)

{

config_snapshot_backend *b = GIT_CONTAINER_OF(cfg, config_snapshot_backend, parent);

git_config_entries *entries = NULL;

git_config_entry *entry;

int error = 0;

if (git_mutex_lock(&b->values_mutex) < 0) {

git_error_set(GIT_ERROR_OS, "failed to lock config backend");

return -1;

}

entries = b->entries;

git_config_entries_incref(entries);

git_mutex_unlock(&b->values_mutex);

if ((error = (git_config_entries_get(&entry, entries, key))) < 0) {

git_config_entries_free(entries);

return error;

}

entry->free = config_snapshot_entry_free;

entry->payload = entries;

*out = entry;

return 0;

}

static int config_snapshot_set(git_config_backend *cfg, const char *name, const char *value)

{

GIT_UNUSED(cfg);

GIT_UNUSED(name);

GIT_UNUSED(value);

return config_error_readonly();

}

static int config_snapshot_set_multivar(

git_config_backend *cfg, const char *name, const char *regexp, const char *value)

{

GIT_UNUSED(cfg);

GIT_UNUSED(name);

GIT_UNUSED(regexp);

GIT_UNUSED(value);

return config_error_readonly();

}

static int config_snapshot_delete_multivar(git_config_backend *cfg, const char *name, const char *regexp)

{

GIT_UNUSED(cfg);

GIT_UNUSED(name);

GIT_UNUSED(regexp);

return config_error_readonly();

}

static int config_snapshot_delete(git_config_backend *cfg, const char *name)

{

GIT_UNUSED(cfg);

GIT_UNUSED(name);

return config_error_readonly();

}

static int config_snapshot_lock(git_config_backend *_cfg)

{

GIT_UNUSED(_cfg);

return config_error_readonly();

}

static int config_snapshot_unlock(git_config_backend *_cfg, int success)

{

GIT_UNUSED(_cfg);

GIT_UNUSED(success);

return config_error_readonly();

}

static void config_snapshot_free(git_config_backend *_backend)

{

config_snapshot_backend *backend = GIT_CONTAINER_OF(_backend, config_snapshot_backend, parent);

if (backend == NULL)

return;

git_config_entries_free(backend->entries);

git_mutex_free(&backend->values_mutex);

git__free(backend);

}

static int config_snapshot_open(git_config_backend *cfg, git_config_level_t level, const git_repository *repo)

{

config_snapshot_backend *b = GIT_CONTAINER_OF(cfg, config_snapshot_backend, parent);

git_config_entries *entries = NULL;

git_config_iterator *it = NULL;

git_config_entry *entry;

int error;

/* We're just copying data, don't care about the level or repo*/

GIT_UNUSED(level);

GIT_UNUSED(repo);

if ((error = git_config_entries_new(&entries)) < 0 ||

(error = b->source->iterator(&it, b->source)) < 0)

goto out;

while ((error = git_config_next(&entry, it)) == 0)

if ((error = git_config_entries_dup_entry(entries, entry)) < 0)

goto out;

if (error < 0) {

if (error != GIT_ITEROVER)

goto out;

error = 0;

}

b->entries = entries;

out:

git_config_iterator_free(it);

if (error)

git_config_entries_free(entries);

return error;

}

int git_config_backend_snapshot(git_config_backend **out, git_config_backend *source)

{

config_snapshot_backend *backend;

backend = git__calloc(1, sizeof(config_snapshot_backend));

GIT_ERROR_CHECK_ALLOC(backend);

backend->parent.version = GIT_CONFIG_BACKEND_VERSION;

git_mutex_init(&backend->values_mutex);

backend->source = source;

backend->parent.readonly = 1;

backend->parent.version = GIT_CONFIG_BACKEND_VERSION;

backend->parent.open = config_snapshot_open;

backend->parent.get = config_snapshot_get;

backend->parent.set = config_snapshot_set;

backend->parent.set_multivar = config_snapshot_set_multivar;

backend->parent.snapshot = git_config_backend_snapshot;

backend->parent.del = config_snapshot_delete;

backend->parent.del_multivar = config_snapshot_delete_multivar;

backend->parent.iterator = config_snapshot_iterator;

backend->parent.lock = config_snapshot_lock;

backend->parent.unlock = config_snapshot_unlock;

backend->parent.free = config_snapshot_free;

*out = &backend->parent;

return 0;

}