| #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 '%s' for 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; |
| } |