Hi, Philip.

The error was covered by my error message. After going one level deep, the real error message is `Package lacks a file header `.

It occurred with the following code, not `package-install-file` (sorry for the confusion).

``elisp

(with-temp-buffer
(dired path)
(ignore-errors (package-dir-info))) ; error occurred this line

```

The test package I'm trying to install is located at https://github.com/emacs-eask/cli/tree/master/test/jest/install/foo-mode.

Thanks!

On Thu, May 22, 2025 at 3:45 AM Philip Kaludercic <philipk@posteo.net> wrote:

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Jen-Chieh Shen <jcs090218@gmail.com>
>> Date: Tue, 20 May 2025 17:08:38 -0700
>>
>> I recently encountered an error, No package in XXX, when using the package-install-file function in
>> the latest Emacs snapshot. This function was working correctly as of May 5, 2025, but started failing
>> sometime after May 8, 2025. I suspect there may have been a breaking change introduced.
>>
>> This issue only affects the snapshot build—my CI tests cover Emacs versions 26.3, 27.2, 28.2, 29.4, 30.1,
>> and the snapshot, and all versions except the snapshot pass. You can view the test results here:
>> https://github.com/emacs-eask/cli/actions/runs/14904371642.
>
> Philip, could you please take a look at this issue?

Can you elaborate what the tests are doing? package-install-file works
fine for me on my end.