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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_backend.h" | |
9 | ||
10 | #include "config.h" | |
11 | #include "config_entries.h" | |
12 | ||
13 | typedef struct { | |
14 | git_config_backend parent; | |
15 | git_mutex values_mutex; | |
16 | git_config_entries *entries; | |
17 | git_config_backend *source; | |
18 | } config_snapshot_backend; | |
19 | ||
20 | static int config_error_readonly(void) | |
21 | { | |
22 | git_error_set(GIT_ERROR_CONFIG, "this backend is read-only"); | |
23 | return -1; | |
24 | } | |
25 | ||
26 | static int config_snapshot_iterator( | |
27 | git_config_iterator **iter, | |
28 | struct git_config_backend *backend) | |
29 | { | |
30 | config_snapshot_backend *b = GIT_CONTAINER_OF(backend, config_snapshot_backend, parent); | |
31 | git_config_entries *entries = NULL; | |
32 | int error; | |
33 | ||
34 | if ((error = git_config_entries_dup(&entries, b->entries)) < 0 || | |
35 | (error = git_config_entries_iterator_new(iter, entries)) < 0) | |
36 | goto out; | |
37 | ||
38 | out: | |
39 | /* Let iterator delete duplicated entries when it's done */ | |
40 | git_config_entries_free(entries); | |
41 | return error; | |
42 | } | |
43 | ||
44 | /* release the map containing the entry as an equivalent to freeing it */ | |
45 | static void config_snapshot_entry_free(git_config_entry *entry) | |
46 | { | |
47 | git_config_entries *entries = (git_config_entries *) entry->payload; | |
48 | git_config_entries_free(entries); | |
49 | } | |
50 | ||
51 | static int config_snapshot_get(git_config_backend *cfg, const char *key, git_config_entry **out) | |
52 | { | |
53 | config_snapshot_backend *b = GIT_CONTAINER_OF(cfg, config_snapshot_backend, parent); | |
54 | git_config_entries *entries = NULL; | |
55 | git_config_entry *entry; | |
56 | int error = 0; | |
57 | ||
58 | if (git_mutex_lock(&b->values_mutex) < 0) { | |
59 | git_error_set(GIT_ERROR_OS, "failed to lock config backend"); | |
60 | return -1; | |
61 | } | |
62 | ||
63 | entries = b->entries; | |
64 | git_config_entries_incref(entries); | |
65 | git_mutex_unlock(&b->values_mutex); | |
66 | ||
67 | if ((error = (git_config_entries_get(&entry, entries, key))) < 0) { | |
68 | git_config_entries_free(entries); | |
69 | return error; | |
70 | } | |
71 | ||
72 | entry->free = config_snapshot_entry_free; | |
73 | entry->payload = entries; | |
74 | *out = entry; | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | static int config_snapshot_set(git_config_backend *cfg, const char *name, const char *value) | |
80 | { | |
81 | GIT_UNUSED(cfg); | |
82 | GIT_UNUSED(name); | |
83 | GIT_UNUSED(value); | |
84 | ||
85 | return config_error_readonly(); | |
86 | } | |
87 | ||
88 | static int config_snapshot_set_multivar( | |
89 | git_config_backend *cfg, const char *name, const char *regexp, const char *value) | |
90 | { | |
91 | GIT_UNUSED(cfg); | |
92 | GIT_UNUSED(name); | |
93 | GIT_UNUSED(regexp); | |
94 | GIT_UNUSED(value); | |
95 | ||
96 | return config_error_readonly(); | |
97 | } | |
98 | ||
99 | static int config_snapshot_delete_multivar(git_config_backend *cfg, const char *name, const char *regexp) | |
100 | { | |
101 | GIT_UNUSED(cfg); | |
102 | GIT_UNUSED(name); | |
103 | GIT_UNUSED(regexp); | |
104 | ||
105 | return config_error_readonly(); | |
106 | } | |
107 | ||
108 | static int config_snapshot_delete(git_config_backend *cfg, const char *name) | |
109 | { | |
110 | GIT_UNUSED(cfg); | |
111 | GIT_UNUSED(name); | |
112 | ||
113 | return config_error_readonly(); | |
114 | } | |
115 | ||
116 | static int config_snapshot_lock(git_config_backend *_cfg) | |
117 | { | |
118 | GIT_UNUSED(_cfg); | |
119 | ||
120 | return config_error_readonly(); | |
121 | } | |
122 | ||
123 | static int config_snapshot_unlock(git_config_backend *_cfg, int success) | |
124 | { | |
125 | GIT_UNUSED(_cfg); | |
126 | GIT_UNUSED(success); | |
127 | ||
128 | return config_error_readonly(); | |
129 | } | |
130 | ||
131 | static void config_snapshot_free(git_config_backend *_backend) | |
132 | { | |
133 | config_snapshot_backend *backend = GIT_CONTAINER_OF(_backend, config_snapshot_backend, parent); | |
134 | ||
135 | if (backend == NULL) | |
136 | return; | |
137 | ||
138 | git_config_entries_free(backend->entries); | |
139 | git_mutex_free(&backend->values_mutex); | |
140 | git__free(backend); | |
141 | } | |
142 | ||
143 | static int config_snapshot_open(git_config_backend *cfg, git_config_level_t level, const git_repository *repo) | |
144 | { | |
145 | config_snapshot_backend *b = GIT_CONTAINER_OF(cfg, config_snapshot_backend, parent); | |
146 | git_config_entries *entries = NULL; | |
147 | git_config_iterator *it = NULL; | |
148 | git_config_entry *entry; | |
149 | int error; | |
150 | ||
151 | /* We're just copying data, don't care about the level or repo*/ | |
152 | GIT_UNUSED(level); | |
153 | GIT_UNUSED(repo); | |
154 | ||
155 | if ((error = git_config_entries_new(&entries)) < 0 || | |
156 | (error = b->source->iterator(&it, b->source)) < 0) | |
157 | goto out; | |
158 | ||
159 | while ((error = git_config_next(&entry, it)) == 0) | |
160 | if ((error = git_config_entries_dup_entry(entries, entry)) < 0) | |
161 | goto out; | |
162 | ||
163 | if (error < 0) { | |
164 | if (error != GIT_ITEROVER) | |
165 | goto out; | |
166 | error = 0; | |
167 | } | |
168 | ||
169 | b->entries = entries; | |
170 | ||
171 | out: | |
172 | git_config_iterator_free(it); | |
173 | if (error) | |
174 | git_config_entries_free(entries); | |
175 | return error; | |
176 | } | |
177 | ||
178 | int git_config_backend_snapshot(git_config_backend **out, git_config_backend *source) | |
179 | { | |
180 | config_snapshot_backend *backend; | |
181 | ||
182 | backend = git__calloc(1, sizeof(config_snapshot_backend)); | |
183 | GIT_ERROR_CHECK_ALLOC(backend); | |
184 | ||
185 | backend->parent.version = GIT_CONFIG_BACKEND_VERSION; | |
186 | git_mutex_init(&backend->values_mutex); | |
187 | ||
188 | backend->source = source; | |
189 | ||
190 | backend->parent.readonly = 1; | |
191 | backend->parent.version = GIT_CONFIG_BACKEND_VERSION; | |
192 | backend->parent.open = config_snapshot_open; | |
193 | backend->parent.get = config_snapshot_get; | |
194 | backend->parent.set = config_snapshot_set; | |
195 | backend->parent.set_multivar = config_snapshot_set_multivar; | |
196 | backend->parent.snapshot = git_config_backend_snapshot; | |
197 | backend->parent.del = config_snapshot_delete; | |
198 | backend->parent.del_multivar = config_snapshot_delete_multivar; | |
199 | backend->parent.iterator = config_snapshot_iterator; | |
200 | backend->parent.lock = config_snapshot_lock; | |
201 | backend->parent.unlock = config_snapshot_unlock; | |
202 | backend->parent.free = config_snapshot_free; | |
203 | ||
204 | *out = &backend->parent; | |
205 | ||
206 | return 0; | |
207 | } |