Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 158 insertions, 0 deletions

diff --git a/connected.c b/connected.c
new file mode 100644
index 0000000..4f6388e
--- /dev/null
+++ b/connected.c
@@ -0,0 +1,158 @@
+#include "cache.h"
+#include "object-store.h"
+#include "run-command.h"
+#include "sigchain.h"
+#include "connected.h"
+#include "transport.h"
+#include "packfile.h"
+#include "promisor-remote.h"
+
+/*
+ * If we feed all the commits we want to verify to this command
+ *
+ *  $ git rev-list --objects --stdin --not --all
+ *
+ * and if it does not error out, that means everything reachable from
+ * these commits locally exists and is connected to our existing refs.
+ * Note that this does _not_ validate the individual objects.
+ *
+ * Returns 0 if everything is connected, non-zero otherwise.
+ */
+int check_connected(oid_iterate_fn fn, void *cb_data,
+		    struct check_connected_options *opt)
+{
+	struct child_process rev_list = CHILD_PROCESS_INIT;
+	FILE *rev_list_in;
+	struct check_connected_options defaults = CHECK_CONNECTED_INIT;
+	const struct object_id *oid;
+	int err = 0;
+	struct packed_git *new_pack = NULL;
+	struct transport *transport;
+	size_t base_len;
+
+	if (!opt)
+		opt = &defaults;
+	transport = opt->transport;
+
+	oid = fn(cb_data);
+	if (!oid) {
+		if (opt->err_fd)
+			close(opt->err_fd);
+		return err;
+	}
+
+	if (transport && transport->smart_options &&
+	    transport->smart_options->self_contained_and_connected &&
+	    transport->pack_lockfiles.nr == 1 &&
+	    strip_suffix(transport->pack_lockfiles.items[0].string,
+			 ".keep", &base_len)) {
+		struct strbuf idx_file = STRBUF_INIT;
+		strbuf_add(&idx_file, transport->pack_lockfiles.items[0].string,
+			   base_len);
+		strbuf_addstr(&idx_file, ".idx");
+		new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
+		strbuf_release(&idx_file);
+	}
+
+	if (has_promisor_remote()) {
+		/*
+		 * For partial clones, we don't want to have to do a regular
+		 * connectivity check because we have to enumerate and exclude
+		 * all promisor objects (slow), and then the connectivity check
+		 * itself becomes a no-op because in a partial clone every
+		 * object is a promisor object. Instead, just make sure we
+		 * received, in a promisor packfile, the objects pointed to by
+		 * each wanted ref.
+		 *
+		 * Before checking for promisor packs, be sure we have the
+		 * latest pack-files loaded into memory.
+		 */
+		reprepare_packed_git(the_repository);
+		do {
+			struct packed_git *p;
+
+			for (p = get_all_packs(the_repository); p; p = p->next) {
+				if (!p->pack_promisor)
+					continue;
+				if (find_pack_entry_one(oid->hash, p))
+					goto promisor_pack_found;
+			}
+			/*
+			 * Fallback to rev-list with oid and the rest of the
+			 * object IDs provided by fn.
+			 */
+			goto no_promisor_pack_found;
+promisor_pack_found:
+			;
+		} while ((oid = fn(cb_data)) != NULL);
+		return 0;
+	}
+
+no_promisor_pack_found:
+	if (opt->shallow_file) {
+		strvec_push(&rev_list.args, "--shallow-file");
+		strvec_push(&rev_list.args, opt->shallow_file);
+	}
+	strvec_push(&rev_list.args,"rev-list");
+	strvec_push(&rev_list.args, "--objects");
+	strvec_push(&rev_list.args, "--stdin");
+	if (has_promisor_remote())
+		strvec_push(&rev_list.args, "--exclude-promisor-objects");
+	if (!opt->is_deepening_fetch) {
+		strvec_push(&rev_list.args, "--not");
+		if (opt->exclude_hidden_refs_section)
+			strvec_pushf(&rev_list.args, "--exclude-hidden=%s",
+				     opt->exclude_hidden_refs_section);
+		strvec_push(&rev_list.args, "--all");
+	}
+	strvec_push(&rev_list.args, "--quiet");
+	strvec_push(&rev_list.args, "--alternate-refs");
+	if (opt->progress)
+		strvec_pushf(&rev_list.args, "--progress=%s",
+			     _("Checking connectivity"));
+
+	rev_list.git_cmd = 1;
+	if (opt->env)
+		strvec_pushv(&rev_list.env, opt->env);
+	rev_list.in = -1;
+	rev_list.no_stdout = 1;
+	if (opt->err_fd)
+		rev_list.err = opt->err_fd;
+	else
+		rev_list.no_stderr = opt->quiet;
+
+	if (start_command(&rev_list))
+		return error(_("Could not run 'git rev-list'"));
+
+	sigchain_push(SIGPIPE, SIG_IGN);
+
+	rev_list_in = xfdopen(rev_list.in, "w");
+
+	do {
+		/*
+		 * If index-pack already checked that:
+		 * - there are no dangling pointers in the new pack
+		 * - the pack is self contained
+		 * Then if the updated ref is in the new pack, then we
+		 * are sure the ref is good and not sending it to
+		 * rev-list for verification.
+		 */
+		if (new_pack && find_pack_entry_one(oid->hash, new_pack))
+			continue;
+
+		if (fprintf(rev_list_in, "%s\n", oid_to_hex(oid)) < 0)
+			break;
+	} while ((oid = fn(cb_data)) != NULL);
+
+	if (ferror(rev_list_in) || fflush(rev_list_in)) {
+		if (errno != EPIPE && errno != EINVAL)
+			error_errno(_("failed write to rev-list"));
+		err = -1;
+	}
+
+	if (fclose(rev_list_in))
+		err = error_errno(_("failed to close rev-list's stdin"));
+
+	sigchain_pop(SIGPIPE);
+	return finish_command(&rev_list) || err;
+}