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2564d994 JK |
1 | #include "cache.h" |
2 | #include "tmp-objdir.h" | |
b3cecf49 | 3 | #include "chdir-notify.h" |
2564d994 JK |
4 | #include "dir.h" |
5 | #include "sigchain.h" | |
6 | #include "string-list.h" | |
7 | #include "strbuf.h" | |
dbbcd44f | 8 | #include "strvec.h" |
aae2ae4f | 9 | #include "quote.h" |
0d4a1321 | 10 | #include "object-store.h" |
2564d994 JK |
11 | |
12 | struct tmp_objdir { | |
13 | struct strbuf path; | |
c972bf4c | 14 | struct strvec env; |
b3cecf49 NS |
15 | struct object_directory *prev_odb; |
16 | int will_destroy; | |
2564d994 JK |
17 | }; |
18 | ||
19 | /* | |
20 | * Allow only one tmp_objdir at a time in a running process, which simplifies | |
22613b25 | 21 | * our atexit cleanup routines. It's doubtful callers will ever need |
2564d994 JK |
22 | * more than one, and we can expand later if so. You can have many such |
23 | * tmp_objdirs simultaneously in many processes, of course. | |
24 | */ | |
25 | static struct tmp_objdir *the_tmp_objdir; | |
26 | ||
27 | static void tmp_objdir_free(struct tmp_objdir *t) | |
28 | { | |
29 | strbuf_release(&t->path); | |
c972bf4c | 30 | strvec_clear(&t->env); |
2564d994 JK |
31 | free(t); |
32 | } | |
33 | ||
22613b25 | 34 | int tmp_objdir_destroy(struct tmp_objdir *t) |
2564d994 JK |
35 | { |
36 | int err; | |
37 | ||
38 | if (!t) | |
39 | return 0; | |
40 | ||
41 | if (t == the_tmp_objdir) | |
42 | the_tmp_objdir = NULL; | |
43 | ||
22613b25 | 44 | if (t->prev_odb) |
b3cecf49 NS |
45 | restore_primary_odb(t->prev_odb, t->path.buf); |
46 | ||
2564d994 JK |
47 | err = remove_dir_recursively(&t->path, 0); |
48 | ||
22613b25 | 49 | tmp_objdir_free(t); |
b3cecf49 | 50 | |
2564d994 JK |
51 | return err; |
52 | } | |
53 | ||
2564d994 JK |
54 | static void remove_tmp_objdir(void) |
55 | { | |
56 | tmp_objdir_destroy(the_tmp_objdir); | |
57 | } | |
58 | ||
7b90ab46 EN |
59 | void tmp_objdir_discard_objects(struct tmp_objdir *t) |
60 | { | |
61 | remove_dir_recursively(&t->path, REMOVE_DIR_KEEP_TOPLEVEL); | |
62 | } | |
63 | ||
2564d994 JK |
64 | /* |
65 | * These env_* functions are for setting up the child environment; the | |
66 | * "replace" variant overrides the value of any existing variable with that | |
67 | * "key". The "append" variant puts our new value at the end of a list, | |
68 | * separated by PATH_SEP (which is what separate values in | |
69 | * GIT_ALTERNATE_OBJECT_DIRECTORIES). | |
70 | */ | |
c972bf4c | 71 | static void env_append(struct strvec *env, const char *key, const char *val) |
2564d994 | 72 | { |
aae2ae4f JK |
73 | struct strbuf quoted = STRBUF_INIT; |
74 | const char *old; | |
2564d994 | 75 | |
aae2ae4f JK |
76 | /* |
77 | * Avoid quoting if it's not necessary, for maximum compatibility | |
78 | * with older parsers which don't understand the quoting. | |
79 | */ | |
80 | if (*val == '"' || strchr(val, PATH_SEP)) { | |
81 | strbuf_addch("ed, '"'); | |
82 | quote_c_style(val, "ed, NULL, 1); | |
83 | strbuf_addch("ed, '"'); | |
84 | val = quoted.buf; | |
85 | } | |
86 | ||
87 | old = getenv(key); | |
2564d994 | 88 | if (!old) |
c972bf4c | 89 | strvec_pushf(env, "%s=%s", key, val); |
2564d994 | 90 | else |
c972bf4c | 91 | strvec_pushf(env, "%s=%s%c%s", key, old, PATH_SEP, val); |
aae2ae4f JK |
92 | |
93 | strbuf_release("ed); | |
2564d994 JK |
94 | } |
95 | ||
c972bf4c | 96 | static void env_replace(struct strvec *env, const char *key, const char *val) |
2564d994 | 97 | { |
c972bf4c | 98 | strvec_pushf(env, "%s=%s", key, val); |
2564d994 JK |
99 | } |
100 | ||
101 | static int setup_tmp_objdir(const char *root) | |
102 | { | |
103 | char *path; | |
104 | int ret = 0; | |
105 | ||
106 | path = xstrfmt("%s/pack", root); | |
107 | ret = mkdir(path, 0777); | |
108 | free(path); | |
109 | ||
110 | return ret; | |
111 | } | |
112 | ||
b3cecf49 | 113 | struct tmp_objdir *tmp_objdir_create(const char *prefix) |
2564d994 JK |
114 | { |
115 | static int installed_handlers; | |
116 | struct tmp_objdir *t; | |
117 | ||
118 | if (the_tmp_objdir) | |
033abf97 | 119 | BUG("only one tmp_objdir can be used at a time"); |
2564d994 | 120 | |
b3cecf49 | 121 | t = xcalloc(1, sizeof(*t)); |
2564d994 | 122 | strbuf_init(&t->path, 0); |
c972bf4c | 123 | strvec_init(&t->env); |
2564d994 | 124 | |
b3cecf49 NS |
125 | /* |
126 | * Use a string starting with tmp_ so that the builtin/prune.c code | |
127 | * can recognize any stale objdirs left behind by a crash and delete | |
128 | * them. | |
129 | */ | |
130 | strbuf_addf(&t->path, "%s/tmp_objdir-%s-XXXXXX", get_object_directory(), prefix); | |
2564d994 | 131 | |
2564d994 JK |
132 | if (!mkdtemp(t->path.buf)) { |
133 | /* free, not destroy, as we never touched the filesystem */ | |
134 | tmp_objdir_free(t); | |
135 | return NULL; | |
136 | } | |
137 | ||
138 | the_tmp_objdir = t; | |
139 | if (!installed_handlers) { | |
140 | atexit(remove_tmp_objdir); | |
2564d994 JK |
141 | installed_handlers++; |
142 | } | |
143 | ||
144 | if (setup_tmp_objdir(t->path.buf)) { | |
145 | tmp_objdir_destroy(t); | |
146 | return NULL; | |
147 | } | |
148 | ||
149 | env_append(&t->env, ALTERNATE_DB_ENVIRONMENT, | |
150 | absolute_path(get_object_directory())); | |
151 | env_replace(&t->env, DB_ENVIRONMENT, absolute_path(t->path.buf)); | |
e34c2e01 JK |
152 | env_replace(&t->env, GIT_QUARANTINE_ENVIRONMENT, |
153 | absolute_path(t->path.buf)); | |
2564d994 JK |
154 | |
155 | return t; | |
156 | } | |
157 | ||
158 | /* | |
159 | * Make sure we copy packfiles and their associated metafiles in the correct | |
160 | * order. All of these ends_with checks are slightly expensive to do in | |
161 | * the midst of a sorting routine, but in practice it shouldn't matter. | |
162 | * We will have a relatively small number of packfiles to order, and loose | |
163 | * objects exit early in the first line. | |
164 | */ | |
165 | static int pack_copy_priority(const char *name) | |
166 | { | |
167 | if (!starts_with(name, "pack")) | |
168 | return 0; | |
169 | if (ends_with(name, ".keep")) | |
170 | return 1; | |
171 | if (ends_with(name, ".pack")) | |
172 | return 2; | |
2f4ba2a8 | 173 | if (ends_with(name, ".rev")) |
2564d994 | 174 | return 3; |
2f4ba2a8 TB |
175 | if (ends_with(name, ".idx")) |
176 | return 4; | |
177 | return 5; | |
2564d994 JK |
178 | } |
179 | ||
180 | static int pack_copy_cmp(const char *a, const char *b) | |
181 | { | |
182 | return pack_copy_priority(a) - pack_copy_priority(b); | |
183 | } | |
184 | ||
185 | static int read_dir_paths(struct string_list *out, const char *path) | |
186 | { | |
187 | DIR *dh; | |
188 | struct dirent *de; | |
189 | ||
190 | dh = opendir(path); | |
191 | if (!dh) | |
192 | return -1; | |
193 | ||
194 | while ((de = readdir(dh))) | |
62fe0eb4 | 195 | if (de->d_name[0] != '.') |
2564d994 JK |
196 | string_list_append(out, de->d_name); |
197 | ||
198 | closedir(dh); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static int migrate_paths(struct strbuf *src, struct strbuf *dst); | |
203 | ||
204 | static int migrate_one(struct strbuf *src, struct strbuf *dst) | |
205 | { | |
206 | struct stat st; | |
207 | ||
208 | if (stat(src->buf, &st) < 0) | |
209 | return -1; | |
210 | if (S_ISDIR(st.st_mode)) { | |
211 | if (!mkdir(dst->buf, 0777)) { | |
212 | if (adjust_shared_perm(dst->buf)) | |
213 | return -1; | |
214 | } else if (errno != EEXIST) | |
215 | return -1; | |
216 | return migrate_paths(src, dst); | |
217 | } | |
218 | return finalize_object_file(src->buf, dst->buf); | |
219 | } | |
220 | ||
221 | static int migrate_paths(struct strbuf *src, struct strbuf *dst) | |
222 | { | |
223 | size_t src_len = src->len, dst_len = dst->len; | |
224 | struct string_list paths = STRING_LIST_INIT_DUP; | |
225 | int i; | |
226 | int ret = 0; | |
227 | ||
228 | if (read_dir_paths(&paths, src->buf) < 0) | |
229 | return -1; | |
230 | paths.cmp = pack_copy_cmp; | |
231 | string_list_sort(&paths); | |
232 | ||
233 | for (i = 0; i < paths.nr; i++) { | |
234 | const char *name = paths.items[i].string; | |
235 | ||
236 | strbuf_addf(src, "/%s", name); | |
237 | strbuf_addf(dst, "/%s", name); | |
238 | ||
239 | ret |= migrate_one(src, dst); | |
240 | ||
241 | strbuf_setlen(src, src_len); | |
242 | strbuf_setlen(dst, dst_len); | |
243 | } | |
244 | ||
245 | string_list_clear(&paths, 0); | |
246 | return ret; | |
247 | } | |
248 | ||
249 | int tmp_objdir_migrate(struct tmp_objdir *t) | |
250 | { | |
251 | struct strbuf src = STRBUF_INIT, dst = STRBUF_INIT; | |
252 | int ret; | |
253 | ||
254 | if (!t) | |
255 | return 0; | |
256 | ||
b3cecf49 NS |
257 | if (t->prev_odb) { |
258 | if (the_repository->objects->odb->will_destroy) | |
259 | BUG("migrating an ODB that was marked for destruction"); | |
260 | restore_primary_odb(t->prev_odb, t->path.buf); | |
261 | t->prev_odb = NULL; | |
262 | } | |
263 | ||
2564d994 JK |
264 | strbuf_addbuf(&src, &t->path); |
265 | strbuf_addstr(&dst, get_object_directory()); | |
266 | ||
267 | ret = migrate_paths(&src, &dst); | |
268 | ||
269 | strbuf_release(&src); | |
270 | strbuf_release(&dst); | |
271 | ||
272 | tmp_objdir_destroy(t); | |
273 | return ret; | |
274 | } | |
275 | ||
276 | const char **tmp_objdir_env(const struct tmp_objdir *t) | |
277 | { | |
278 | if (!t) | |
279 | return NULL; | |
d70a9eb6 | 280 | return t->env.v; |
2564d994 JK |
281 | } |
282 | ||
283 | void tmp_objdir_add_as_alternate(const struct tmp_objdir *t) | |
284 | { | |
285 | add_to_alternates_memory(t->path.buf); | |
286 | } | |
b3cecf49 NS |
287 | |
288 | void tmp_objdir_replace_primary_odb(struct tmp_objdir *t, int will_destroy) | |
289 | { | |
290 | if (t->prev_odb) | |
291 | BUG("the primary object database is already replaced"); | |
292 | t->prev_odb = set_temporary_primary_odb(t->path.buf, will_destroy); | |
293 | t->will_destroy = will_destroy; | |
294 | } | |
295 | ||
296 | struct tmp_objdir *tmp_objdir_unapply_primary_odb(void) | |
297 | { | |
298 | if (!the_tmp_objdir || !the_tmp_objdir->prev_odb) | |
299 | return NULL; | |
300 | ||
301 | restore_primary_odb(the_tmp_objdir->prev_odb, the_tmp_objdir->path.buf); | |
302 | the_tmp_objdir->prev_odb = NULL; | |
303 | return the_tmp_objdir; | |
304 | } | |
305 | ||
306 | void tmp_objdir_reapply_primary_odb(struct tmp_objdir *t, const char *old_cwd, | |
307 | const char *new_cwd) | |
308 | { | |
309 | char *path; | |
310 | ||
311 | path = reparent_relative_path(old_cwd, new_cwd, t->path.buf); | |
312 | strbuf_reset(&t->path); | |
313 | strbuf_addstr(&t->path, path); | |
314 | free(path); | |
315 | tmp_objdir_replace_primary_odb(t, t->will_destroy); | |
316 | } |