Hi Michael, I see, thanks for the explanations! It's indeed curious that the usual user/group mechanism isn't used here. I will ask the people at DESY what's going on here in detail, but I heard some time ago that ACLs are being used, which seem to work in parallel to the usual Linux rights. Maybe tramp doesn't support this?
Is there a way to tell tramp to simply omit these permission checks? Do you know which purpose the checks serve? I mean, couldn't tramp just try to open files and then fail if the OS gives an error? Cheers Philipp > Michael Albinus <michael.albi...@gmx.de> hat am 15.06.2024 11:12 CEST > geschrieben: > > > Philipp Middendorf <pmid...@mailbox.org> writes: > > > Hi Michael, > > Hi Philipp, > > > thanks for digging through that giant of a log file. It seems you > > conclude that tramp's behavior is fine as it is. But is it? I can > > clearly access the files and directories, manually via "ssh ...; cd > > ...;" and even through tramp, as demonstrated via ido. But then with > > dired, tramp can somehow not do it anymore? Is tramp doing an extra > > permissions check here that fails, or what's the deeper reason behind > > the error? In other words, what's different from the way tramp > > accesses files vs. tramp+ido or me ssh'ing into the machine? > > The problem is the call of access-file, which checks, whether a file or > directory is accessible. Internally, it calls file-accessible-directory-p. > > This has a simple implementation in Tramp: > > --8<---------------cut here---------------start------------->8--- > (defun tramp-handle-file-accessible-directory-p (filename) > "Like `file-accessible-directory-p' for Tramp files." > (and (file-directory-p filename) > (file-readable-p filename))) > --8<---------------cut here---------------end--------------->8--- > > And this fails for the file-readable-p part. > > I suspect, that ido doesn't call access-file for the directory. However > I'm curious to understand why ido can read files in that directory, > although it has permissions "dr-xr-x---", and you are neither the user > "fsdata" nor in the "fsdata" group. Is there a hidden setting on that > machine, that you can read the contents of the directory nevertheless? > > > PS: I'm in the Hamburg branch of DESY, but we're in close relations > > with Zeuthen. Funny that you know of it. :) > > Well, I'm living in the neighbor village of Zeuthen, in Wildau. And > decades ago, I've worked for a research institute in Berlin Adlershof, > which was a spin-off of the predecessor of desy Zeuthen > <https://en.wikipedia.org/wiki/DESY#Zeuthen>. Achhhh ... > > > Cheers > > Philipp > > Best regards, Michael.
