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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:34:27 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:34:27 +0000
commit4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f (patch)
tree47c1d492e9c956c1cd2b74dbd3b9d8b0db44dc4e /ls-refs.c
parentInitial commit. (diff)
downloadgit-4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f.tar.xz
git-4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f.zip
Adding upstream version 1:2.43.0.upstream/1%2.43.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'ls-refs.c')
-rw-r--r--ls-refs.c212
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;
+}