diff options
Diffstat (limited to 'ls-refs.c')
| -rw-r--r-- | ls-refs.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/ls-refs.c b/ls-refs.c new file mode 100644 index 0000000..0e49b93 --- /dev/null +++ b/ls-refs.c @@ -0,0 +1,212 @@ +#include "git-compat-util.h" +#include "environment.h" +#include "gettext.h" +#include "hash.h" +#include "hex.h" +#include "repository.h" +#include "refs.h" +#include "remote.h" +#include "strvec.h" +#include "ls-refs.h" +#include "pkt-line.h" +#include "config.h" +#include "string-list.h" + +static enum { + UNBORN_IGNORE = 0, + UNBORN_ALLOW, + UNBORN_ADVERTISE /* implies ALLOW */ +} unborn_config(struct repository *r) +{ + const char *str = NULL; + + if (repo_config_get_string_tmp(r, "lsrefs.unborn", &str)) { + /* + * If there is no such config, advertise and allow it by + * default. + */ + return UNBORN_ADVERTISE; + } else { + if (!strcmp(str, "advertise")) { + return UNBORN_ADVERTISE; + } else if (!strcmp(str, "allow")) { + return UNBORN_ALLOW; + } else if (!strcmp(str, "ignore")) { + return UNBORN_IGNORE; + } else { + die(_("invalid value for '%s': '%s'"), + "lsrefs.unborn", str); + } + } +} + +/* + * 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; + struct strvec hidden_refs; + 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, &data->hidden_refs)) + 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, + const struct config_context *ctx UNUSED, + void *cb_data) +{ + struct ls_refs_data *data = cb_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", &data->hidden_refs); +} + +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); + strvec_init(&data.hidden_refs); + + git_config(ls_refs_config, &data); + + 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 = !!unborn_config(r); + 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, ""); + refs_for_each_fullref_in_prefixes(get_main_ref_store(r), + get_git_namespace(), data.prefixes.v, + hidden_refs_to_excludes(&data.hidden_refs), + send_ref, &data); + packet_fflush(stdout); + strvec_clear(&data.prefixes); + strbuf_release(&data.buf); + strvec_clear(&data.hidden_refs); + return 0; +} + +int ls_refs_advertise(struct repository *r, struct strbuf *value) +{ + if (value && unborn_config(r) == UNBORN_ADVERTISE) + strbuf_addstr(value, "unborn"); + + return 1; +} |