Merge branch 'rs/freebsd-getcwd-workaround'

FreeBSD implementation of getcwd(3) behaved differently when an
intermediate directory is unreadable/unsearchable depending on the
length of the buffer provided, which our strbuf_getcwd() was not
aware of.  strbuf_getcwd() has been taught to cope with it better.

* rs/freebsd-getcwd-workaround:
  strbuf: support long paths w/o read rights in strbuf_getcwd() on FreeBSD

strbuf.c

@@ -449,6 +449,17 @@ int strbuf_getcwd(struct strbuf *sb)
 			strbuf_setlen(sb, strlen(sb->buf));
 			return 0;
 		}
+
+		/*
+		 * If getcwd(3) is implemented as a syscall that falls
+		 * back to a regular lookup using readdir(3) etc. then
+		 * we may be able to avoid EACCES by providing enough
+		 * space to the syscall as it's not necessarily bound
+		 * to the same restrictions as the fallback.
+		 */
+		if (errno == EACCES && guessed_len < PATH_MAX)
+			continue;
+
 		if (errno != ERANGE)
 			break;
 	}