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Commit | Line | Data |
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2564d994 JK |
1 | #include "cache.h" |
2 | #include "tmp-objdir.h" | |
0b027f6c | 3 | #include "abspath.h" |
b3cecf49 | 4 | #include "chdir-notify.h" |
2564d994 | 5 | #include "dir.h" |
32a8f510 | 6 | #include "environment.h" |
2564d994 JK |
7 | #include "sigchain.h" |
8 | #include "string-list.h" | |
9 | #include "strbuf.h" | |
dbbcd44f | 10 | #include "strvec.h" |
aae2ae4f | 11 | #include "quote.h" |
0d4a1321 | 12 | #include "object-store.h" |
2564d994 JK |
13 | |
14 | struct tmp_objdir { | |
15 | struct strbuf path; | |
c972bf4c | 16 | struct strvec env; |
b3cecf49 NS |
17 | struct object_directory *prev_odb; |
18 | int will_destroy; | |
2564d994 JK |
19 | }; |
20 | ||
21 | /* | |
22 | * Allow only one tmp_objdir at a time in a running process, which simplifies | |
22613b25 | 23 | * our atexit cleanup routines. It's doubtful callers will ever need |
2564d994 JK |
24 | * more than one, and we can expand later if so. You can have many such |
25 | * tmp_objdirs simultaneously in many processes, of course. | |
26 | */ | |
27 | static struct tmp_objdir *the_tmp_objdir; | |
28 | ||
29 | static void tmp_objdir_free(struct tmp_objdir *t) | |
30 | { | |
31 | strbuf_release(&t->path); | |
c972bf4c | 32 | strvec_clear(&t->env); |
2564d994 JK |
33 | free(t); |
34 | } | |
35 | ||
22613b25 | 36 | int tmp_objdir_destroy(struct tmp_objdir *t) |
2564d994 JK |
37 | { |
38 | int err; | |
39 | ||
40 | if (!t) | |
41 | return 0; | |
42 | ||
43 | if (t == the_tmp_objdir) | |
44 | the_tmp_objdir = NULL; | |
45 | ||
22613b25 | 46 | if (t->prev_odb) |
b3cecf49 NS |
47 | restore_primary_odb(t->prev_odb, t->path.buf); |
48 | ||
2564d994 JK |
49 | err = remove_dir_recursively(&t->path, 0); |
50 | ||
22613b25 | 51 | tmp_objdir_free(t); |
b3cecf49 | 52 | |
2564d994 JK |
53 | return err; |
54 | } | |
55 | ||
2564d994 JK |
56 | static void remove_tmp_objdir(void) |
57 | { | |
58 | tmp_objdir_destroy(the_tmp_objdir); | |
59 | } | |
60 | ||
7b90ab46 EN |
61 | void tmp_objdir_discard_objects(struct tmp_objdir *t) |
62 | { | |
63 | remove_dir_recursively(&t->path, REMOVE_DIR_KEEP_TOPLEVEL); | |
64 | } | |
65 | ||
2564d994 JK |
66 | /* |
67 | * These env_* functions are for setting up the child environment; the | |
68 | * "replace" variant overrides the value of any existing variable with that | |
69 | * "key". The "append" variant puts our new value at the end of a list, | |
70 | * separated by PATH_SEP (which is what separate values in | |
71 | * GIT_ALTERNATE_OBJECT_DIRECTORIES). | |
72 | */ | |
c972bf4c | 73 | static void env_append(struct strvec *env, const char *key, const char *val) |
2564d994 | 74 | { |
aae2ae4f JK |
75 | struct strbuf quoted = STRBUF_INIT; |
76 | const char *old; | |
2564d994 | 77 | |
aae2ae4f JK |
78 | /* |
79 | * Avoid quoting if it's not necessary, for maximum compatibility | |
80 | * with older parsers which don't understand the quoting. | |
81 | */ | |
82 | if (*val == '"' || strchr(val, PATH_SEP)) { | |
83 | strbuf_addch("ed, '"'); | |
84 | quote_c_style(val, "ed, NULL, 1); | |
85 | strbuf_addch("ed, '"'); | |
86 | val = quoted.buf; | |
87 | } | |
88 | ||
89 | old = getenv(key); | |
2564d994 | 90 | if (!old) |
c972bf4c | 91 | strvec_pushf(env, "%s=%s", key, val); |
2564d994 | 92 | else |
c972bf4c | 93 | strvec_pushf(env, "%s=%s%c%s", key, old, PATH_SEP, val); |
aae2ae4f JK |
94 | |
95 | strbuf_release("ed); | |
2564d994 JK |
96 | } |
97 | ||
c972bf4c | 98 | static void env_replace(struct strvec *env, const char *key, const char *val) |
2564d994 | 99 | { |
c972bf4c | 100 | strvec_pushf(env, "%s=%s", key, val); |
2564d994 JK |
101 | } |
102 | ||
103 | static int setup_tmp_objdir(const char *root) | |
104 | { | |
105 | char *path; | |
106 | int ret = 0; | |
107 | ||
108 | path = xstrfmt("%s/pack", root); | |
109 | ret = mkdir(path, 0777); | |
110 | free(path); | |
111 | ||
112 | return ret; | |
113 | } | |
114 | ||
b3cecf49 | 115 | struct tmp_objdir *tmp_objdir_create(const char *prefix) |
2564d994 JK |
116 | { |
117 | static int installed_handlers; | |
118 | struct tmp_objdir *t; | |
119 | ||
120 | if (the_tmp_objdir) | |
033abf97 | 121 | BUG("only one tmp_objdir can be used at a time"); |
2564d994 | 122 | |
b3cecf49 | 123 | t = xcalloc(1, sizeof(*t)); |
2564d994 | 124 | strbuf_init(&t->path, 0); |
c972bf4c | 125 | strvec_init(&t->env); |
2564d994 | 126 | |
b3cecf49 NS |
127 | /* |
128 | * Use a string starting with tmp_ so that the builtin/prune.c code | |
129 | * can recognize any stale objdirs left behind by a crash and delete | |
130 | * them. | |
131 | */ | |
132 | strbuf_addf(&t->path, "%s/tmp_objdir-%s-XXXXXX", get_object_directory(), prefix); | |
2564d994 | 133 | |
2564d994 JK |
134 | if (!mkdtemp(t->path.buf)) { |
135 | /* free, not destroy, as we never touched the filesystem */ | |
136 | tmp_objdir_free(t); | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | the_tmp_objdir = t; | |
141 | if (!installed_handlers) { | |
142 | atexit(remove_tmp_objdir); | |
2564d994 JK |
143 | installed_handlers++; |
144 | } | |
145 | ||
146 | if (setup_tmp_objdir(t->path.buf)) { | |
147 | tmp_objdir_destroy(t); | |
148 | return NULL; | |
149 | } | |
150 | ||
151 | env_append(&t->env, ALTERNATE_DB_ENVIRONMENT, | |
152 | absolute_path(get_object_directory())); | |
153 | env_replace(&t->env, DB_ENVIRONMENT, absolute_path(t->path.buf)); | |
e34c2e01 JK |
154 | env_replace(&t->env, GIT_QUARANTINE_ENVIRONMENT, |
155 | absolute_path(t->path.buf)); | |
2564d994 JK |
156 | |
157 | return t; | |
158 | } | |
159 | ||
160 | /* | |
161 | * Make sure we copy packfiles and their associated metafiles in the correct | |
162 | * order. All of these ends_with checks are slightly expensive to do in | |
163 | * the midst of a sorting routine, but in practice it shouldn't matter. | |
164 | * We will have a relatively small number of packfiles to order, and loose | |
165 | * objects exit early in the first line. | |
166 | */ | |
167 | static int pack_copy_priority(const char *name) | |
168 | { | |
169 | if (!starts_with(name, "pack")) | |
170 | return 0; | |
171 | if (ends_with(name, ".keep")) | |
172 | return 1; | |
173 | if (ends_with(name, ".pack")) | |
174 | return 2; | |
2f4ba2a8 | 175 | if (ends_with(name, ".rev")) |
2564d994 | 176 | return 3; |
2f4ba2a8 TB |
177 | if (ends_with(name, ".idx")) |
178 | return 4; | |
179 | return 5; | |
2564d994 JK |
180 | } |
181 | ||
182 | static int pack_copy_cmp(const char *a, const char *b) | |
183 | { | |
184 | return pack_copy_priority(a) - pack_copy_priority(b); | |
185 | } | |
186 | ||
187 | static int read_dir_paths(struct string_list *out, const char *path) | |
188 | { | |
189 | DIR *dh; | |
190 | struct dirent *de; | |
191 | ||
192 | dh = opendir(path); | |
193 | if (!dh) | |
194 | return -1; | |
195 | ||
196 | while ((de = readdir(dh))) | |
62fe0eb4 | 197 | if (de->d_name[0] != '.') |
2564d994 JK |
198 | string_list_append(out, de->d_name); |
199 | ||
200 | closedir(dh); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int migrate_paths(struct strbuf *src, struct strbuf *dst); | |
205 | ||
206 | static int migrate_one(struct strbuf *src, struct strbuf *dst) | |
207 | { | |
208 | struct stat st; | |
209 | ||
210 | if (stat(src->buf, &st) < 0) | |
211 | return -1; | |
212 | if (S_ISDIR(st.st_mode)) { | |
213 | if (!mkdir(dst->buf, 0777)) { | |
214 | if (adjust_shared_perm(dst->buf)) | |
215 | return -1; | |
216 | } else if (errno != EEXIST) | |
217 | return -1; | |
218 | return migrate_paths(src, dst); | |
219 | } | |
220 | return finalize_object_file(src->buf, dst->buf); | |
221 | } | |
222 | ||
223 | static int migrate_paths(struct strbuf *src, struct strbuf *dst) | |
224 | { | |
225 | size_t src_len = src->len, dst_len = dst->len; | |
226 | struct string_list paths = STRING_LIST_INIT_DUP; | |
227 | int i; | |
228 | int ret = 0; | |
229 | ||
230 | if (read_dir_paths(&paths, src->buf) < 0) | |
231 | return -1; | |
232 | paths.cmp = pack_copy_cmp; | |
233 | string_list_sort(&paths); | |
234 | ||
235 | for (i = 0; i < paths.nr; i++) { | |
236 | const char *name = paths.items[i].string; | |
237 | ||
238 | strbuf_addf(src, "/%s", name); | |
239 | strbuf_addf(dst, "/%s", name); | |
240 | ||
241 | ret |= migrate_one(src, dst); | |
242 | ||
243 | strbuf_setlen(src, src_len); | |
244 | strbuf_setlen(dst, dst_len); | |
245 | } | |
246 | ||
247 | string_list_clear(&paths, 0); | |
248 | return ret; | |
249 | } | |
250 | ||
251 | int tmp_objdir_migrate(struct tmp_objdir *t) | |
252 | { | |
253 | struct strbuf src = STRBUF_INIT, dst = STRBUF_INIT; | |
254 | int ret; | |
255 | ||
256 | if (!t) | |
257 | return 0; | |
258 | ||
b3cecf49 NS |
259 | if (t->prev_odb) { |
260 | if (the_repository->objects->odb->will_destroy) | |
261 | BUG("migrating an ODB that was marked for destruction"); | |
262 | restore_primary_odb(t->prev_odb, t->path.buf); | |
263 | t->prev_odb = NULL; | |
264 | } | |
265 | ||
2564d994 JK |
266 | strbuf_addbuf(&src, &t->path); |
267 | strbuf_addstr(&dst, get_object_directory()); | |
268 | ||
269 | ret = migrate_paths(&src, &dst); | |
270 | ||
271 | strbuf_release(&src); | |
272 | strbuf_release(&dst); | |
273 | ||
274 | tmp_objdir_destroy(t); | |
275 | return ret; | |
276 | } | |
277 | ||
278 | const char **tmp_objdir_env(const struct tmp_objdir *t) | |
279 | { | |
280 | if (!t) | |
281 | return NULL; | |
d70a9eb6 | 282 | return t->env.v; |
2564d994 JK |
283 | } |
284 | ||
285 | void tmp_objdir_add_as_alternate(const struct tmp_objdir *t) | |
286 | { | |
287 | add_to_alternates_memory(t->path.buf); | |
288 | } | |
b3cecf49 NS |
289 | |
290 | void tmp_objdir_replace_primary_odb(struct tmp_objdir *t, int will_destroy) | |
291 | { | |
292 | if (t->prev_odb) | |
293 | BUG("the primary object database is already replaced"); | |
294 | t->prev_odb = set_temporary_primary_odb(t->path.buf, will_destroy); | |
295 | t->will_destroy = will_destroy; | |
296 | } | |
297 | ||
298 | struct tmp_objdir *tmp_objdir_unapply_primary_odb(void) | |
299 | { | |
300 | if (!the_tmp_objdir || !the_tmp_objdir->prev_odb) | |
301 | return NULL; | |
302 | ||
303 | restore_primary_odb(the_tmp_objdir->prev_odb, the_tmp_objdir->path.buf); | |
304 | the_tmp_objdir->prev_odb = NULL; | |
305 | return the_tmp_objdir; | |
306 | } | |
307 | ||
308 | void tmp_objdir_reapply_primary_odb(struct tmp_objdir *t, const char *old_cwd, | |
309 | const char *new_cwd) | |
310 | { | |
311 | char *path; | |
312 | ||
313 | path = reparent_relative_path(old_cwd, new_cwd, t->path.buf); | |
314 | strbuf_reset(&t->path); | |
315 | strbuf_addstr(&t->path, path); | |
316 | free(path); | |
317 | tmp_objdir_replace_primary_odb(t, t->will_destroy); | |
318 | } |