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| #include "cache.h" | |
| #include "repository.h" | |
| #include "refs.h" | |
| #include "remote.h" | |
| #include "strvec.h" | |
| #include "ls-refs.h" | |
| #include "pkt-line.h" | |
| #include "config.h" | |
| static int config_read; | |
| static int advertise_unborn; | |
| static int allow_unborn; | |
| static void ensure_config_read(void) | |
| { | |
| const char *str = NULL; | |
| if (config_read) | |
| return; | |
| if (repo_config_get_string_tmp(the_repository, "lsrefs.unborn", &str)) { | |
| /* | |
| * If there is no such config, advertise and allow it by | |
| * default. | |
| */ | |
| advertise_unborn = 1; | |
| allow_unborn = 1; | |
| } else { | |
| if (!strcmp(str, "advertise")) { | |
| advertise_unborn = 1; | |
| allow_unborn = 1; | |
| } else if (!strcmp(str, "allow")) { | |
| allow_unborn = 1; | |
| } else if (!strcmp(str, "ignore")) { | |
| /* do nothing */ | |
| } else { | |
| die(_("invalid value for '%s': '%s'"), | |
| "lsrefs.unborn", str); | |
| } | |
| } | |
| config_read = 1; | |
| } | |
| /* | |
| * If we see this many or more "ref-prefix" lines from the client, we consider | |
| * it "too many" and will avoid using the prefix feature entirely. | |
| */ | |
| #define TOO_MANY_PREFIXES 65536 | |
| /* | |
| * Check if one of the prefixes is a prefix of the ref. | |
| * If no prefixes were provided, all refs match. | |
| */ | |
| static int ref_match(const struct strvec *prefixes, const char *refname) | |
| { | |
| int i; | |
| if (!prefixes->nr) | |
| return 1; /* no restriction */ | |
| for (i = 0; i < prefixes->nr; i++) { | |
| const char *prefix = prefixes->v[i]; | |
| if (starts_with(refname, prefix)) | |
| return 1; | |
| } | |
| return 0; | |
| } | |
| struct ls_refs_data { | |
| unsigned peel; | |
| unsigned symrefs; | |
| struct strvec prefixes; | |
| struct strbuf buf; | |
| unsigned unborn : 1; | |
| }; | |
| static int send_ref(const char *refname, const struct object_id *oid, | |
| int flag, void *cb_data) | |
| { | |
| struct ls_refs_data *data = cb_data; | |
| const char *refname_nons = strip_namespace(refname); | |
| strbuf_reset(&data->buf); | |
| if (ref_is_hidden(refname_nons, refname)) | |
| return 0; | |
| if (!ref_match(&data->prefixes, refname_nons)) | |
| return 0; | |
| if (oid) | |
| strbuf_addf(&data->buf, "%s %s", oid_to_hex(oid), refname_nons); | |
| else | |
| strbuf_addf(&data->buf, "unborn %s", refname_nons); | |
| if (data->symrefs && flag & REF_ISSYMREF) { | |
| struct object_id unused; | |
| const char *symref_target = resolve_ref_unsafe(refname, 0, | |
| &unused, | |
| &flag); | |
| if (!symref_target) | |
| die("'%s' is a symref but it is not?", refname); | |
| strbuf_addf(&data->buf, " symref-target:%s", | |
| strip_namespace(symref_target)); | |
| } | |
| if (data->peel && oid) { | |
| struct object_id peeled; | |
| if (!peel_iterated_oid(oid, &peeled)) | |
| strbuf_addf(&data->buf, " peeled:%s", oid_to_hex(&peeled)); | |
| } | |
| strbuf_addch(&data->buf, '\n'); | |
| packet_fwrite(stdout, data->buf.buf, data->buf.len); | |
| return 0; | |
| } | |
| static void send_possibly_unborn_head(struct ls_refs_data *data) | |
| { | |
| struct strbuf namespaced = STRBUF_INIT; | |
| struct object_id oid; | |
| int flag; | |
| int oid_is_null; | |
| strbuf_addf(&namespaced, "%sHEAD", get_git_namespace()); | |
| if (!resolve_ref_unsafe(namespaced.buf, 0, &oid, &flag)) | |
| return; /* bad ref */ | |
| oid_is_null = is_null_oid(&oid); | |
| if (!oid_is_null || | |
| (data->unborn && data->symrefs && (flag & REF_ISSYMREF))) | |
| send_ref(namespaced.buf, oid_is_null ? NULL : &oid, flag, data); | |
| strbuf_release(&namespaced); | |
| } | |
| static int ls_refs_config(const char *var, const char *value, void *data) | |
| { | |
| /* | |
| * We only serve fetches over v2 for now, so respect only "uploadpack" | |
| * config. This may need to eventually be expanded to "receive", but we | |
| * don't yet know how that information will be passed to ls-refs. | |
| */ | |
| return parse_hide_refs_config(var, value, "uploadpack"); | |
| } | |
| int ls_refs(struct repository *r, struct packet_reader *request) | |
| { | |
| struct ls_refs_data data; | |
| memset(&data, 0, sizeof(data)); | |
| strvec_init(&data.prefixes); | |
| strbuf_init(&data.buf, 0); | |
| ensure_config_read(); | |
| git_config(ls_refs_config, NULL); | |
| while (packet_reader_read(request) == PACKET_READ_NORMAL) { | |
| const char *arg = request->line; | |
| const char *out; | |
| if (!strcmp("peel", arg)) | |
| data.peel = 1; | |
| else if (!strcmp("symrefs", arg)) | |
| data.symrefs = 1; | |
| else if (skip_prefix(arg, "ref-prefix ", &out)) { | |
| if (data.prefixes.nr < TOO_MANY_PREFIXES) | |
| strvec_push(&data.prefixes, out); | |
| } | |
| else if (!strcmp("unborn", arg)) | |
| data.unborn = allow_unborn; | |
| else | |
| die(_("unexpected line: '%s'"), arg); | |
| } | |
| if (request->status != PACKET_READ_FLUSH) | |
| die(_("expected flush after ls-refs arguments")); | |
| /* | |
| * If we saw too many prefixes, we must avoid using them at all; as | |
| * soon as we have any prefix, they are meant to form a comprehensive | |
| * list. | |
| */ | |
| if (data.prefixes.nr >= TOO_MANY_PREFIXES) | |
| strvec_clear(&data.prefixes); | |
| send_possibly_unborn_head(&data); | |
| if (!data.prefixes.nr) | |
| strvec_push(&data.prefixes, ""); | |
| for_each_fullref_in_prefixes(get_git_namespace(), data.prefixes.v, | |
| send_ref, &data); | |
| packet_fflush(stdout); | |
| strvec_clear(&data.prefixes); | |
| strbuf_release(&data.buf); | |
| return 0; | |
| } | |
| int ls_refs_advertise(struct repository *r, struct strbuf *value) | |
| { | |
| if (value) { | |
| ensure_config_read(); | |
| if (advertise_unborn) | |
| strbuf_addstr(value, "unborn"); | |
| } | |
| return 1; | |
| } |