From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ken Brown Newsgroups: gmane.emacs.bugs Subject: bug#70415: 30.0.50; [Cygwin] `lock-file' creates a symlink with funny name Date: Mon, 22 Apr 2024 12:15:42 -0400 Message-ID: References: <861q75juvy.fsf@gnu.org> <86zftsgoxt.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="5510"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla Thunderbird Cc: 70415@debbugs.gnu.org To: Eli Zaretskii , Katsumi Yamaoka Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Apr 22 18:17:07 2024 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1rywLr-0001BR-Ay for geb-bug-gnu-emacs@m.gmane-mx.org; 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Thanks. > > The question is: why it started appearing only recently? The code in > filelock.c hasn't changed since last December, if not earlier, so if > this started happening recently, it could only be because Gnulib's > get_boot_time or its Cygwin implementation changed, such that it was > previously returning zero whereas now it returns non-zero (which > triggers the addition of the ":BOOT_TIME" part to the file name). > >>>> | commit 393f58c85aeb78f814866ccaad9ae7efd3fa6766 >>>> | Author: Adam Porter >>>> | Date: Fri Mar 8 23:43:14 2024 -0600 >> >>> This is extremely unlikely to have caused the problem. It is more >>> likely that some change in Cygwin and/or in the Gnulib's boot-time >>> module causes this now. >> >> Indeed. But the fact is that Emacs built with that revno adds >> a colon and a negative number to a link name and the one built >> with just before it does not. No problem on 29.3.50 and earlier, >> either (i.e., not add a colon and numbers). > > Then please step with a debugger through the relevant code in > filelock.c, before and after that change, and see why they are > different. I cannot explain that, even after doing "git log -L" on > all of filelock.c: the most recent change of the related code was in > Aug 2023, AFAICT, which is a very far cry from Mar 2024. > > And even if we understand why you now get the ":BOOT_TIME" part, > there's still the question why it cannot be unlinked, if Cygwin > supports file names with a colon. Maybe it's because Emacs creates a > symlink, and symlinks with such names are not supported by Cygwin? I'm still traveling for another week and won't have time to try to reproduce and debug this until I return. But I did do one quick test in a Cygwin shell. I created a symlink .#FILE -> username@hostname.1234:-11644473599 and deleted it with rm. So symlinks like this are indeed supported by Cygwin. To be continued... Ken