conan package registry and header only packages

[lukester1975]

Description

Header only conan packages can generate an empty conaninfo.txt, due to

def package_id(self):
    self.info.clear()

gitea is currently ignoring such files, which appears to be due to

gitea/routers/api/packages/conan/conan.go

Lines 328 to 332 in e502be4

	if buf.Size() == 0 {
	// ignore empty uploads, second request contains content
	jsonResponse(ctx, http.StatusOK, nil)
	return
	}

which breaks the conan client when trying to consume such packages:

tuplet/2.1.1: ERROR: Exception while getting package: da39a3ee5e6b4b0d3255bfef95601890afd80709
tuplet/2.1.1: ERROR: Exception: <class 'conans.errors.ConanException'> Corrupted tuplet/2.1.1:da39a3ee5e6b4b0d3255bfef95601890afd80709 in 'external' remote: no conaninfo.txt
ERROR: Corrupted tuplet/2.1.1:da39a3ee5e6b4b0d3255bfef95601890afd80709 in 'external' remote: no conaninfo.txt

Removing the above block in conan.go allows the empty conaninfo.txt to be stored in the registry, and the conan client works successfully.

Whether there are any other side effects of removing the check I couldn't say... seems OK so far though.

Thanks

Gitea Version

1.20.4

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

No response

Screenshots

No response

Git Version

N/a

Operating System

Linux

How are you running Gitea?

N/a but Fedora 38, systemd, custom build.

Database

MySQL/MariaDB

[KN4CK3R]

While implementing the Conan registry I noticed the conan client uploads empty files in a first request and with content in the second request. Therefore I ignored these requests. Will test it again, maybe this will work:

	isConaninfoFile := filename == conaninfoFile

	if buf.Size() == 0 && !isConaninfoFile {
		// ignore empty uploads, second request contains content
		jsonResponse(ctx, http.StatusOK, nil)
		return
	}

[KN4CK3R]

Looks like the Conan CLI has changed since last year. My package creation instructions don't work anymore and the empty uploads don't occur anymore.