Merge branch 'ps/send-pack-unhide-error-in-atomic-push' into jch

"git push --atomic --porcelain" used to ignore failures from the
other side, losing the error status from the child process, which
has been corrected.

* ps/send-pack-unhide-error-in-atomic-push:
  send-pack: gracefully close the connection for atomic push
  t5543: atomic push reports exit code failure
  send-pack: new return code "ERROR_SEND_PACK_BAD_REF_STATUS"
  t5548: add porcelain push test cases for dry-run mode
  t5548: add new porcelain test cases
  t5548: refactor test cases by resetting upstream
  t5548: refactor to reuse setup_upstream() function
  t5504: modernize test by moving heredocs into test bodies

Author: gitster

send-pack.c

@@ -632,7 +632,8 @@ int send_pack(struct repository *r,
 				reject_atomic_push(remote_refs, args->send_mirror);
 				error("atomic push failed for ref %s. status: %d",
 				      ref->name, ref->status);
-				ret = args->porcelain ? 0 : -1;
+				ret = ERROR_SEND_PACK_BAD_REF_STATUS;
+				packet_flush(out);
 				goto out;
 			}
 			/* else fallthrough */
@@ -763,19 +764,14 @@ int send_pack(struct repository *r,
 	if (ret < 0)
 		goto out;
 
-	if (args->porcelain) {
-		ret = 0;
-		goto out;
-	}
-
 	for (ref = remote_refs; ref; ref = ref->next) {
 		switch (ref->status) {
 		case REF_STATUS_NONE:
 		case REF_STATUS_UPTODATE:
 		case REF_STATUS_OK:
 			break;
 		default:
-			ret = -1;
+			ret = ERROR_SEND_PACK_BAD_REF_STATUS;
 			goto out;
 		}
 	}

send-pack.h

@@ -13,6 +13,9 @@ struct repository;
 #define SEND_PACK_PUSH_CERT_IF_ASKED 1
 #define SEND_PACK_PUSH_CERT_ALWAYS 2
 
+/* At least one reference has been rejected by the remote side. */
+#define ERROR_SEND_PACK_BAD_REF_STATUS 1
+
 struct send_pack_args {
 	const char *url;
 	unsigned verbose:1,
@@ -36,6 +39,16 @@ struct option;
 int option_parse_push_signed(const struct option *opt,
 			     const char *arg, int unset);
 
+/*
+ * Compute a packfile and write it to a file descriptor. The `fd` array needs
+ * to contain two file descriptors: `fd[0]` is the file descriptor used as
+ * input for the packet reader, whereas `fd[1]` is the file descriptor the
+ * packfile will be written to.
+ *
+ * Returns 0 on success, non-zero otherwise. Negative return values indicate a
+ * generic error, whereas positive return values indicate specific error
+ * conditions as documented with the `ERROR_SEND_PACK_*` constants.
+ */
 int send_pack(struct repository *r, struct send_pack_args *args,
 	      int fd[], struct child_process *conn,
 	      struct ref *remote_refs, struct oid_array *extra_have);

t/t5504-fetch-receive-strict.sh

@@ -64,12 +64,6 @@ test_expect_success 'fetch with transfer.fsckobjects' '
 	)
 '
 
-cat >exp <<EOF
-To dst
-!	refs/heads/main:refs/heads/test	[remote rejected] (missing necessary objects)
-Done
-EOF
-
 test_expect_success 'push without strict' '
 	rm -rf dst &&
 	git init dst &&
@@ -78,6 +72,11 @@ test_expect_success 'push without strict' '
 		git config fetch.fsckobjects false &&
 		git config transfer.fsckobjects false
 	) &&
+	cat >exp <<-\EOF &&
+	To dst
+	!	refs/heads/main:refs/heads/test	[remote rejected] (missing necessary objects)
+	Done
+	EOF
 	test_must_fail git push --porcelain dst main:refs/heads/test >act &&
 	test_cmp exp act
 '
@@ -94,11 +93,6 @@ test_expect_success 'push with !receive.fsckobjects' '
 	test_cmp exp act
 '
 
-cat >exp <<EOF
-To dst
-!	refs/heads/main:refs/heads/test	[remote rejected] (unpacker error)
-EOF
-
 test_expect_success 'push with receive.fsckobjects' '
 	rm -rf dst &&
 	git init dst &&
@@ -107,6 +101,10 @@ test_expect_success 'push with receive.fsckobjects' '
 		git config receive.fsckobjects true &&
 		git config transfer.fsckobjects false
 	) &&
+	cat >exp <<-\EOF &&
+	To dst
+	!	refs/heads/main:refs/heads/test	[remote rejected] (unpacker error)
+	EOF
 	test_must_fail git push --porcelain dst main:refs/heads/test >act &&
 	test_cmp exp act
 '
@@ -129,15 +127,14 @@ test_expect_success 'repair the "corrupt or missing" object' '
 	git fsck
 '
 
-cat >bogus-commit <<EOF
-tree $EMPTY_TREE
-author Bugs Bunny 1234567890 +0000
-committer Bugs Bunny <[email protected]> 1234567890 +0000
-
-This commit object intentionally broken
-EOF
-
 test_expect_success 'setup bogus commit' '
+	cat >bogus-commit <<-EOF &&
+	tree $EMPTY_TREE
+	author Bugs Bunny 1234567890 +0000
+	committer Bugs Bunny <[email protected]> 1234567890 +0000
+
+	This commit object intentionally broken
+	EOF
 	commit="$(git hash-object --literally -t commit -w --stdin <bogus-commit)"
 '
 

t/t5543-atomic-push.sh

@@ -280,4 +280,34 @@ test_expect_success 'atomic push reports (reject by non-ff)' '
 	test_cmp expect actual
 '
 
+test_expect_success 'atomic push reports exit code failure' '
+	write_script receive-pack-wrapper <<-\EOF &&
+	git-receive-pack "$@"
+	exit 1
+	EOF
+	test_must_fail git -C workbench push --atomic \
+		--receive-pack="${SQ}$(pwd)${SQ}/receive-pack-wrapper" \
+		up HEAD:refs/heads/no-conflict 2>err &&
+	cat >expect <<-EOF &&
+	To ../upstream
+	 * [new branch]      HEAD -> no-conflict
+	error: failed to push some refs to ${SQ}../upstream${SQ}
+	EOF
+	test_cmp expect err
+'
+
+test_expect_success 'atomic push reports exit code failure with porcelain' '
+	write_script receive-pack-wrapper <<-\EOF &&
+	git-receive-pack "$@"
+	exit 1
+	EOF
+	test_must_fail git -C workbench push --atomic --porcelain \
+		--receive-pack="${SQ}$(pwd)${SQ}/receive-pack-wrapper" \
+		up HEAD:refs/heads/no-conflict-porcelain 2>err &&
+	cat >expect <<-EOF &&
+	error: failed to push some refs to ${SQ}../upstream${SQ}
+	EOF
+	test_cmp expect err
+'
+
 test_done