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1 | #include "cache.h" | |
2 | #include "tmp-objdir.h" | |
3 | #include "dir.h" | |
4 | #include "sigchain.h" | |
5 | #include "string-list.h" | |
6 | #include "strbuf.h" | |
7 | #include "strvec.h" | |
8 | #include "quote.h" | |
9 | #include "object-store.h" | |
10 | ||
11 | struct tmp_objdir { | |
12 | struct strbuf path; | |
13 | struct strvec env; | |
14 | }; | |
15 | ||
16 | /* | |
17 | * Allow only one tmp_objdir at a time in a running process, which simplifies | |
18 | * our signal/atexit cleanup routines. It's doubtful callers will ever need | |
19 | * more than one, and we can expand later if so. You can have many such | |
20 | * tmp_objdirs simultaneously in many processes, of course. | |
21 | */ | |
22 | static struct tmp_objdir *the_tmp_objdir; | |
23 | ||
24 | static void tmp_objdir_free(struct tmp_objdir *t) | |
25 | { | |
26 | strbuf_release(&t->path); | |
27 | strvec_clear(&t->env); | |
28 | free(t); | |
29 | } | |
30 | ||
31 | static int tmp_objdir_destroy_1(struct tmp_objdir *t, int on_signal) | |
32 | { | |
33 | int err; | |
34 | ||
35 | if (!t) | |
36 | return 0; | |
37 | ||
38 | if (t == the_tmp_objdir) | |
39 | the_tmp_objdir = NULL; | |
40 | ||
41 | /* | |
42 | * This may use malloc via strbuf_grow(), but we should | |
43 | * have pre-grown t->path sufficiently so that this | |
44 | * doesn't happen in practice. | |
45 | */ | |
46 | err = remove_dir_recursively(&t->path, 0); | |
47 | ||
48 | /* | |
49 | * When we are cleaning up due to a signal, we won't bother | |
50 | * freeing memory; it may cause a deadlock if the signal | |
51 | * arrived while libc's allocator lock is held. | |
52 | */ | |
53 | if (!on_signal) | |
54 | tmp_objdir_free(t); | |
55 | return err; | |
56 | } | |
57 | ||
58 | int tmp_objdir_destroy(struct tmp_objdir *t) | |
59 | { | |
60 | return tmp_objdir_destroy_1(t, 0); | |
61 | } | |
62 | ||
63 | static void remove_tmp_objdir(void) | |
64 | { | |
65 | tmp_objdir_destroy(the_tmp_objdir); | |
66 | } | |
67 | ||
68 | static void remove_tmp_objdir_on_signal(int signo) | |
69 | { | |
70 | tmp_objdir_destroy_1(the_tmp_objdir, 1); | |
71 | sigchain_pop(signo); | |
72 | raise(signo); | |
73 | } | |
74 | ||
75 | /* | |
76 | * These env_* functions are for setting up the child environment; the | |
77 | * "replace" variant overrides the value of any existing variable with that | |
78 | * "key". The "append" variant puts our new value at the end of a list, | |
79 | * separated by PATH_SEP (which is what separate values in | |
80 | * GIT_ALTERNATE_OBJECT_DIRECTORIES). | |
81 | */ | |
82 | static void env_append(struct strvec *env, const char *key, const char *val) | |
83 | { | |
84 | struct strbuf quoted = STRBUF_INIT; | |
85 | const char *old; | |
86 | ||
87 | /* | |
88 | * Avoid quoting if it's not necessary, for maximum compatibility | |
89 | * with older parsers which don't understand the quoting. | |
90 | */ | |
91 | if (*val == '"' || strchr(val, PATH_SEP)) { | |
92 | strbuf_addch("ed, '"'); | |
93 | quote_c_style(val, "ed, NULL, 1); | |
94 | strbuf_addch("ed, '"'); | |
95 | val = quoted.buf; | |
96 | } | |
97 | ||
98 | old = getenv(key); | |
99 | if (!old) | |
100 | strvec_pushf(env, "%s=%s", key, val); | |
101 | else | |
102 | strvec_pushf(env, "%s=%s%c%s", key, old, PATH_SEP, val); | |
103 | ||
104 | strbuf_release("ed); | |
105 | } | |
106 | ||
107 | static void env_replace(struct strvec *env, const char *key, const char *val) | |
108 | { | |
109 | strvec_pushf(env, "%s=%s", key, val); | |
110 | } | |
111 | ||
112 | static int setup_tmp_objdir(const char *root) | |
113 | { | |
114 | char *path; | |
115 | int ret = 0; | |
116 | ||
117 | path = xstrfmt("%s/pack", root); | |
118 | ret = mkdir(path, 0777); | |
119 | free(path); | |
120 | ||
121 | return ret; | |
122 | } | |
123 | ||
124 | struct tmp_objdir *tmp_objdir_create(void) | |
125 | { | |
126 | static int installed_handlers; | |
127 | struct tmp_objdir *t; | |
128 | ||
129 | if (the_tmp_objdir) | |
130 | BUG("only one tmp_objdir can be used at a time"); | |
131 | ||
132 | t = xmalloc(sizeof(*t)); | |
133 | strbuf_init(&t->path, 0); | |
134 | strvec_init(&t->env); | |
135 | ||
136 | strbuf_addf(&t->path, "%s/incoming-XXXXXX", get_object_directory()); | |
137 | ||
138 | /* | |
139 | * Grow the strbuf beyond any filename we expect to be placed in it. | |
140 | * If tmp_objdir_destroy() is called by a signal handler, then | |
141 | * we should be able to use the strbuf to remove files without | |
142 | * having to call malloc. | |
143 | */ | |
144 | strbuf_grow(&t->path, 1024); | |
145 | ||
146 | if (!mkdtemp(t->path.buf)) { | |
147 | /* free, not destroy, as we never touched the filesystem */ | |
148 | tmp_objdir_free(t); | |
149 | return NULL; | |
150 | } | |
151 | ||
152 | the_tmp_objdir = t; | |
153 | if (!installed_handlers) { | |
154 | atexit(remove_tmp_objdir); | |
155 | sigchain_push_common(remove_tmp_objdir_on_signal); | |
156 | installed_handlers++; | |
157 | } | |
158 | ||
159 | if (setup_tmp_objdir(t->path.buf)) { | |
160 | tmp_objdir_destroy(t); | |
161 | return NULL; | |
162 | } | |
163 | ||
164 | env_append(&t->env, ALTERNATE_DB_ENVIRONMENT, | |
165 | absolute_path(get_object_directory())); | |
166 | env_replace(&t->env, DB_ENVIRONMENT, absolute_path(t->path.buf)); | |
167 | env_replace(&t->env, GIT_QUARANTINE_ENVIRONMENT, | |
168 | absolute_path(t->path.buf)); | |
169 | ||
170 | return t; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Make sure we copy packfiles and their associated metafiles in the correct | |
175 | * order. All of these ends_with checks are slightly expensive to do in | |
176 | * the midst of a sorting routine, but in practice it shouldn't matter. | |
177 | * We will have a relatively small number of packfiles to order, and loose | |
178 | * objects exit early in the first line. | |
179 | */ | |
180 | static int pack_copy_priority(const char *name) | |
181 | { | |
182 | if (!starts_with(name, "pack")) | |
183 | return 0; | |
184 | if (ends_with(name, ".keep")) | |
185 | return 1; | |
186 | if (ends_with(name, ".pack")) | |
187 | return 2; | |
188 | if (ends_with(name, ".idx")) | |
189 | return 3; | |
190 | return 4; | |
191 | } | |
192 | ||
193 | static int pack_copy_cmp(const char *a, const char *b) | |
194 | { | |
195 | return pack_copy_priority(a) - pack_copy_priority(b); | |
196 | } | |
197 | ||
198 | static int read_dir_paths(struct string_list *out, const char *path) | |
199 | { | |
200 | DIR *dh; | |
201 | struct dirent *de; | |
202 | ||
203 | dh = opendir(path); | |
204 | if (!dh) | |
205 | return -1; | |
206 | ||
207 | while ((de = readdir(dh))) | |
208 | if (de->d_name[0] != '.') | |
209 | string_list_append(out, de->d_name); | |
210 | ||
211 | closedir(dh); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | static int migrate_paths(struct strbuf *src, struct strbuf *dst); | |
216 | ||
217 | static int migrate_one(struct strbuf *src, struct strbuf *dst) | |
218 | { | |
219 | struct stat st; | |
220 | ||
221 | if (stat(src->buf, &st) < 0) | |
222 | return -1; | |
223 | if (S_ISDIR(st.st_mode)) { | |
224 | if (!mkdir(dst->buf, 0777)) { | |
225 | if (adjust_shared_perm(dst->buf)) | |
226 | return -1; | |
227 | } else if (errno != EEXIST) | |
228 | return -1; | |
229 | return migrate_paths(src, dst); | |
230 | } | |
231 | return finalize_object_file(src->buf, dst->buf); | |
232 | } | |
233 | ||
234 | static int migrate_paths(struct strbuf *src, struct strbuf *dst) | |
235 | { | |
236 | size_t src_len = src->len, dst_len = dst->len; | |
237 | struct string_list paths = STRING_LIST_INIT_DUP; | |
238 | int i; | |
239 | int ret = 0; | |
240 | ||
241 | if (read_dir_paths(&paths, src->buf) < 0) | |
242 | return -1; | |
243 | paths.cmp = pack_copy_cmp; | |
244 | string_list_sort(&paths); | |
245 | ||
246 | for (i = 0; i < paths.nr; i++) { | |
247 | const char *name = paths.items[i].string; | |
248 | ||
249 | strbuf_addf(src, "/%s", name); | |
250 | strbuf_addf(dst, "/%s", name); | |
251 | ||
252 | ret |= migrate_one(src, dst); | |
253 | ||
254 | strbuf_setlen(src, src_len); | |
255 | strbuf_setlen(dst, dst_len); | |
256 | } | |
257 | ||
258 | string_list_clear(&paths, 0); | |
259 | return ret; | |
260 | } | |
261 | ||
262 | int tmp_objdir_migrate(struct tmp_objdir *t) | |
263 | { | |
264 | struct strbuf src = STRBUF_INIT, dst = STRBUF_INIT; | |
265 | int ret; | |
266 | ||
267 | if (!t) | |
268 | return 0; | |
269 | ||
270 | strbuf_addbuf(&src, &t->path); | |
271 | strbuf_addstr(&dst, get_object_directory()); | |
272 | ||
273 | ret = migrate_paths(&src, &dst); | |
274 | ||
275 | strbuf_release(&src); | |
276 | strbuf_release(&dst); | |
277 | ||
278 | tmp_objdir_destroy(t); | |
279 | return ret; | |
280 | } | |
281 | ||
282 | const char **tmp_objdir_env(const struct tmp_objdir *t) | |
283 | { | |
284 | if (!t) | |
285 | return NULL; | |
286 | return t->env.v; | |
287 | } | |
288 | ||
289 | void tmp_objdir_add_as_alternate(const struct tmp_objdir *t) | |
290 | { | |
291 | add_to_alternates_memory(t->path.buf); | |
292 | } |