diff options
Diffstat (limited to 'third_party/git/tmp-objdir.c')
-rw-r--r-- | third_party/git/tmp-objdir.c | 292 |
1 files changed, 0 insertions, 292 deletions
diff --git a/third_party/git/tmp-objdir.c b/third_party/git/tmp-objdir.c deleted file mode 100644 index 42ed4db5d3a5..000000000000 --- a/third_party/git/tmp-objdir.c +++ /dev/null @@ -1,292 +0,0 @@ -#include "cache.h" -#include "tmp-objdir.h" -#include "dir.h" -#include "sigchain.h" -#include "string-list.h" -#include "strbuf.h" -#include "strvec.h" -#include "quote.h" -#include "object-store.h" - -struct tmp_objdir { - struct strbuf path; - struct strvec env; -}; - -/* - * Allow only one tmp_objdir at a time in a running process, which simplifies - * our signal/atexit cleanup routines. It's doubtful callers will ever need - * more than one, and we can expand later if so. You can have many such - * tmp_objdirs simultaneously in many processes, of course. - */ -static struct tmp_objdir *the_tmp_objdir; - -static void tmp_objdir_free(struct tmp_objdir *t) -{ - strbuf_release(&t->path); - strvec_clear(&t->env); - free(t); -} - -static int tmp_objdir_destroy_1(struct tmp_objdir *t, int on_signal) -{ - int err; - - if (!t) - return 0; - - if (t == the_tmp_objdir) - the_tmp_objdir = NULL; - - /* - * This may use malloc via strbuf_grow(), but we should - * have pre-grown t->path sufficiently so that this - * doesn't happen in practice. - */ - err = remove_dir_recursively(&t->path, 0); - - /* - * When we are cleaning up due to a signal, we won't bother - * freeing memory; it may cause a deadlock if the signal - * arrived while libc's allocator lock is held. - */ - if (!on_signal) - tmp_objdir_free(t); - return err; -} - -int tmp_objdir_destroy(struct tmp_objdir *t) -{ - return tmp_objdir_destroy_1(t, 0); -} - -static void remove_tmp_objdir(void) -{ - tmp_objdir_destroy(the_tmp_objdir); -} - -static void remove_tmp_objdir_on_signal(int signo) -{ - tmp_objdir_destroy_1(the_tmp_objdir, 1); - sigchain_pop(signo); - raise(signo); -} - -/* - * These env_* functions are for setting up the child environment; the - * "replace" variant overrides the value of any existing variable with that - * "key". The "append" variant puts our new value at the end of a list, - * separated by PATH_SEP (which is what separate values in - * GIT_ALTERNATE_OBJECT_DIRECTORIES). - */ -static void env_append(struct strvec *env, const char *key, const char *val) -{ - struct strbuf quoted = STRBUF_INIT; - const char *old; - - /* - * Avoid quoting if it's not necessary, for maximum compatibility - * with older parsers which don't understand the quoting. - */ - if (*val == '"' || strchr(val, PATH_SEP)) { - strbuf_addch("ed, '"'); - quote_c_style(val, "ed, NULL, 1); - strbuf_addch("ed, '"'); - val = quoted.buf; - } - - old = getenv(key); - if (!old) - strvec_pushf(env, "%s=%s", key, val); - else - strvec_pushf(env, "%s=%s%c%s", key, old, PATH_SEP, val); - - strbuf_release("ed); -} - -static void env_replace(struct strvec *env, const char *key, const char *val) -{ - strvec_pushf(env, "%s=%s", key, val); -} - -static int setup_tmp_objdir(const char *root) -{ - char *path; - int ret = 0; - - path = xstrfmt("%s/pack", root); - ret = mkdir(path, 0777); - free(path); - - return ret; -} - -struct tmp_objdir *tmp_objdir_create(void) -{ - static int installed_handlers; - struct tmp_objdir *t; - - if (the_tmp_objdir) - BUG("only one tmp_objdir can be used at a time"); - - t = xmalloc(sizeof(*t)); - strbuf_init(&t->path, 0); - strvec_init(&t->env); - - strbuf_addf(&t->path, "%s/incoming-XXXXXX", get_object_directory()); - - /* - * Grow the strbuf beyond any filename we expect to be placed in it. - * If tmp_objdir_destroy() is called by a signal handler, then - * we should be able to use the strbuf to remove files without - * having to call malloc. - */ - strbuf_grow(&t->path, 1024); - - if (!mkdtemp(t->path.buf)) { - /* free, not destroy, as we never touched the filesystem */ - tmp_objdir_free(t); - return NULL; - } - - the_tmp_objdir = t; - if (!installed_handlers) { - atexit(remove_tmp_objdir); - sigchain_push_common(remove_tmp_objdir_on_signal); - installed_handlers++; - } - - if (setup_tmp_objdir(t->path.buf)) { - tmp_objdir_destroy(t); - return NULL; - } - - env_append(&t->env, ALTERNATE_DB_ENVIRONMENT, - absolute_path(get_object_directory())); - env_replace(&t->env, DB_ENVIRONMENT, absolute_path(t->path.buf)); - env_replace(&t->env, GIT_QUARANTINE_ENVIRONMENT, - absolute_path(t->path.buf)); - - return t; -} - -/* - * Make sure we copy packfiles and their associated metafiles in the correct - * order. All of these ends_with checks are slightly expensive to do in - * the midst of a sorting routine, but in practice it shouldn't matter. - * We will have a relatively small number of packfiles to order, and loose - * objects exit early in the first line. - */ -static int pack_copy_priority(const char *name) -{ - if (!starts_with(name, "pack")) - return 0; - if (ends_with(name, ".keep")) - return 1; - if (ends_with(name, ".pack")) - return 2; - if (ends_with(name, ".idx")) - return 3; - return 4; -} - -static int pack_copy_cmp(const char *a, const char *b) -{ - return pack_copy_priority(a) - pack_copy_priority(b); -} - -static int read_dir_paths(struct string_list *out, const char *path) -{ - DIR *dh; - struct dirent *de; - - dh = opendir(path); - if (!dh) - return -1; - - while ((de = readdir(dh))) - if (de->d_name[0] != '.') - string_list_append(out, de->d_name); - - closedir(dh); - return 0; -} - -static int migrate_paths(struct strbuf *src, struct strbuf *dst); - -static int migrate_one(struct strbuf *src, struct strbuf *dst) -{ - struct stat st; - - if (stat(src->buf, &st) < 0) - return -1; - if (S_ISDIR(st.st_mode)) { - if (!mkdir(dst->buf, 0777)) { - if (adjust_shared_perm(dst->buf)) - return -1; - } else if (errno != EEXIST) - return -1; - return migrate_paths(src, dst); - } - return finalize_object_file(src->buf, dst->buf); -} - -static int migrate_paths(struct strbuf *src, struct strbuf *dst) -{ - size_t src_len = src->len, dst_len = dst->len; - struct string_list paths = STRING_LIST_INIT_DUP; - int i; - int ret = 0; - - if (read_dir_paths(&paths, src->buf) < 0) - return -1; - paths.cmp = pack_copy_cmp; - string_list_sort(&paths); - - for (i = 0; i < paths.nr; i++) { - const char *name = paths.items[i].string; - - strbuf_addf(src, "/%s", name); - strbuf_addf(dst, "/%s", name); - - ret |= migrate_one(src, dst); - - strbuf_setlen(src, src_len); - strbuf_setlen(dst, dst_len); - } - - string_list_clear(&paths, 0); - return ret; -} - -int tmp_objdir_migrate(struct tmp_objdir *t) -{ - struct strbuf src = STRBUF_INIT, dst = STRBUF_INIT; - int ret; - - if (!t) - return 0; - - strbuf_addbuf(&src, &t->path); - strbuf_addstr(&dst, get_object_directory()); - - ret = migrate_paths(&src, &dst); - - strbuf_release(&src); - strbuf_release(&dst); - - tmp_objdir_destroy(t); - return ret; -} - -const char **tmp_objdir_env(const struct tmp_objdir *t) -{ - if (!t) - return NULL; - return t->env.v; -} - -void tmp_objdir_add_as_alternate(const struct tmp_objdir *t) -{ - add_to_alternates_memory(t->path.buf); -} |