src/config_mem.c

   1 /*
   2  * Copyright (C) the libgit2 contributors. All rights reserved.
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7
   8 #include "config.h"
   9
  10 #include "config_backend.h"
  11 #include "config_parse.h"
  12 #include "config_entries.h"
  13
  14 typedef struct {
  15         git_config_backend parent;
  16         git_config_entries *entries;
  17         git_buf cfg;
  18 } config_memory_backend;
  19
  20 typedef struct {
  21         git_config_entries *entries;
  22         git_config_level_t level;
  23 } config_memory_parse_data;
  24
  25 static int config_error_readonly(void)
  26 {
  27         git_error_set(GIT_ERROR_CONFIG, "this backend is read-only");
  28         return -1;
  29 }
  30
  31 static int read_variable_cb(
  32         git_config_parser *reader,
  33         const char *current_section,
  34         const char *var_name,
  35         const char *var_value,
  36         const char *line,
  37         size_t line_len,
  38         void *payload)
  39 {
  40         config_memory_parse_data *parse_data = (config_memory_parse_data *) payload;
  41         git_buf buf = GIT_BUF_INIT;
  42         git_config_entry *entry;
  43         const char *c;
  44         int result;
  45
  46         GIT_UNUSED(reader);
  47         GIT_UNUSED(line);
  48         GIT_UNUSED(line_len);
  49
  50         if (current_section) {
  51                 /* TODO: Once warnings land, we should likely warn
  52                  * here. Git appears to warn in most cases if it sees
  53                  * un-namespaced config options.
  54                  */
  55                 git_buf_puts(&buf, current_section);
  56                 git_buf_putc(&buf, '.');
  57         }
  58
  59         for (c = var_name; *c; c++)
  60                 git_buf_putc(&buf, git__tolower(*c));
  61
  62         if (git_buf_oom(&buf))
  63                 return -1;
  64
  65         entry = git__calloc(1, sizeof(git_config_entry));
  66         GIT_ERROR_CHECK_ALLOC(entry);
  67         entry->name = git_buf_detach(&buf);
  68         entry->value = var_value ? git__strdup(var_value) : NULL;
  69         entry->level = parse_data->level;
  70         entry->include_depth = 0;
  71
  72         if ((result = git_config_entries_append(parse_data->entries, entry)) < 0)
  73                 return result;
  74
  75         return result;
  76 }
  77
  78 static int config_memory_open(git_config_backend *backend, git_config_level_t level, const git_repository *repo)
  79 {
  80         config_memory_backend *memory_backend = (config_memory_backend *) backend;
  81         git_config_parser parser = GIT_PARSE_CTX_INIT;
  82         config_memory_parse_data parse_data;
  83         int error;
  84
  85         GIT_UNUSED(repo);
  86
  87         if ((error = git_config_parser_init(&parser, "in-memory", memory_backend->cfg.ptr,
  88                                             memory_backend->cfg.size)) < 0)
  89                 goto out;
  90         parse_data.entries = memory_backend->entries;
  91         parse_data.level = level;
  92
  93         if ((error = git_config_parse(&parser, NULL, read_variable_cb, NULL, NULL, &parse_data)) < 0)
  94                 goto out;
  95
  96 out:
  97         git_config_parser_dispose(&parser);
  98         return error;
  99 }
 100
 101 static int config_memory_get(git_config_backend *backend, const char *key, git_config_entry **out)
 102 {
 103         config_memory_backend *memory_backend = (config_memory_backend *) backend;
 104         return git_config_entries_get(out, memory_backend->entries, key);
 105 }
 106
 107 static int config_memory_iterator(
 108         git_config_iterator **iter,
 109         git_config_backend *backend)
 110 {
 111         config_memory_backend *memory_backend = (config_memory_backend *) backend;
 112         git_config_entries *entries;
 113         int error;
 114
 115         if ((error = git_config_entries_dup(&entries, memory_backend->entries)) < 0)
 116                 goto out;
 117
 118         if ((error = git_config_entries_iterator_new(iter, entries)) < 0)
 119                 goto out;
 120
 121 out:
 122         /* Let iterator delete duplicated entries when it's done */
 123         git_config_entries_free(entries);
 124         return error;
 125 }
 126
 127 static int config_memory_set(git_config_backend *backend, const char *name, const char *value)
 128 {
 129         GIT_UNUSED(backend);
 130         GIT_UNUSED(name);
 131         GIT_UNUSED(value);
 132         return config_error_readonly();
 133 }
 134
 135 static int config_memory_set_multivar(
 136         git_config_backend *backend, const char *name, const char *regexp, const char *value)
 137 {
 138         GIT_UNUSED(backend);
 139         GIT_UNUSED(name);
 140         GIT_UNUSED(regexp);
 141         GIT_UNUSED(value);
 142         return config_error_readonly();
 143 }
 144
 145 static int config_memory_delete(git_config_backend *backend, const char *name)
 146 {
 147         GIT_UNUSED(backend);
 148         GIT_UNUSED(name);
 149         return config_error_readonly();
 150 }
 151
 152 static int config_memory_delete_multivar(git_config_backend *backend, const char *name, const char *regexp)
 153 {
 154         GIT_UNUSED(backend);
 155         GIT_UNUSED(name);
 156         GIT_UNUSED(regexp);
 157         return config_error_readonly();
 158 }
 159
 160 static int config_memory_lock(git_config_backend *backend)
 161 {
 162         GIT_UNUSED(backend);
 163         return config_error_readonly();
 164 }
 165
 166 static int config_memory_unlock(git_config_backend *backend, int success)
 167 {
 168         GIT_UNUSED(backend);
 169         GIT_UNUSED(success);
 170         return config_error_readonly();
 171 }
 172
 173 static void config_memory_free(git_config_backend *_backend)
 174 {
 175         config_memory_backend *backend = (config_memory_backend *)_backend;
 176
 177         if (backend == NULL)
 178                 return;
 179
 180         git_config_entries_free(backend->entries);
 181         git_buf_dispose(&backend->cfg);
 182         git__free(backend);
 183 }
 184
 185 int git_config_backend_from_string(git_config_backend **out, const char *cfg, size_t len)
 186 {
 187         config_memory_backend *backend;
 188
 189         backend = git__calloc(1, sizeof(config_memory_backend));
 190         GIT_ERROR_CHECK_ALLOC(backend);
 191
 192         if (git_config_entries_new(&backend->entries) < 0) {
 193                 git__free(backend);
 194                 return -1;
 195         }
 196
 197         if (git_buf_set(&backend->cfg, cfg, len) < 0) {
 198                 git_config_entries_free(backend->entries);
 199                 git__free(backend);
 200                 return -1;
 201         }
 202
 203         backend->parent.version = GIT_CONFIG_BACKEND_VERSION;
 204         backend->parent.readonly = 1;
 205         backend->parent.open = config_memory_open;
 206         backend->parent.get = config_memory_get;
 207         backend->parent.set = config_memory_set;
 208         backend->parent.set_multivar = config_memory_set_multivar;
 209         backend->parent.del = config_memory_delete;
 210         backend->parent.del_multivar = config_memory_delete_multivar;
 211         backend->parent.iterator = config_memory_iterator;
 212         backend->parent.lock = config_memory_lock;
 213         backend->parent.unlock = config_memory_unlock;
 214         backend->parent.snapshot = git_config_backend_snapshot;
 215         backend->parent.free = config_memory_free;
 216
 217         *out = (git_config_backend *)backend;
 218
 219         return 0;
 220 }