thanks thomas and stsp for reviewing!

I had another small tweak i'd like to commit before moving into more
interesting diffs (dry run, error recovering, no final newline etc) that
I forgot to include in previous mail, apologies.

The following moves some checks done in apply_patch early in recv_patch
so that we bail out early in case of malformed patches and changes the
error for mismatching paths from

	% got patch < diff
	got: the paths mentioned in the patch are different.
to
	% got patch < diff
	got: old file is "foo" and new "bar": paths are different

OK?

-----------------------------------------------
commit a7644c1cb79603b8de3f810911678d752c49bea2
from: Omar Polo <op@omarpolo.com>
date: Fri Mar 11 17:28:10 2022 UTC
 
 move some checks from apply_patch to recv_patch and improve error messages
 
diff 59937e062fff6aafbbcb872633fcbd9ca6e2bf1d bbe7d371e6b251355093d9773cea760227d04297
blob - 64f2cb93558b933d2ffdcc0da7dedecf78d8ee52
blob + 996438cb363cfd0114a5dc376b56f1fa1a77a957
--- include/got_error.h
+++ include/got_error.h
@@ -346,8 +346,7 @@ static const struct got_error {
 	{ GOT_ERR_PATCH_MALFORMED, "malformed patch" },
 	{ GOT_ERR_PATCH_TRUNCATED, "patch truncated" },
 	{ GOT_ERR_PATCH_DONT_APPLY, "patch doesn't apply" },
-	{ GOT_ERR_PATCH_PATHS_DIFFER, "the paths mentioned in the patch "
-	    "are different." },
+	{ GOT_ERR_PATCH_PATHS_DIFFER, "paths are different" },
 	{ GOT_ERR_NO_PATCH, "no patch found" },
 };
 
blob - adbe4b1cb254d02c8c04017209e50dd8a445f2b3
blob + dbb8084fc9fe60812af9eec1b989894266a6e83a
--- lib/patch.c
+++ lib/patch.c
@@ -173,6 +173,17 @@ recv_patch(struct imsgbuf *ibuf, int *done, struct got
 		goto done;
 	}
 
+	if (p->old == NULL && p->new == NULL) {
+		err = got_error(GOT_ERR_PATCH_MALFORMED);
+		goto done;
+	}
+	if (p->old != NULL && p->new != NULL && strcmp(p->old, p->new)) {
+		err = got_error_fmt(GOT_ERR_PATCH_PATHS_DIFFER,
+		    "old file is \"%s\" and new \"%s\"",
+		    p->old, p->new);
+		goto done;
+	}
+
 	imsg_free(&imsg);
 
 	for (;;) {
@@ -411,9 +422,6 @@ apply_patch(struct got_worktree *worktree, struct got_
 
 	TAILQ_INIT(&paths);
 
-	if (p->old == NULL && p->new == NULL)
-		return got_error(GOT_ERR_PATCH_MALFORMED);
-
 	err = got_worktree_resolve_path(&path, worktree,
 	    p->new != NULL ? p->new : p->old);
 	if (err)
@@ -439,9 +447,6 @@ apply_patch(struct got_worktree *worktree, struct got_
 			err = got_worktree_schedule_delete(worktree, &paths,
 			    0, NULL, delete_cb, delete_arg, repo, 0, 0);
 		goto done;
-	} else if (p->old != NULL && strcmp(p->old, p->new)) {
-		err = got_error(GOT_ERR_PATCH_PATHS_DIFFER);
-		goto done;
 	}
 
 	/* can't add known files or modify unknown ones */