Lennart Poettering
9e3fa6e827
Let's rework touch_file() so that it works correctly on sockets, fifos, and device nodes: let's open an O_PATH file descriptor first and operate based on that, if we can. This is usually the better option as it this means we can open AF_UNIX nodes in the file system, and update their timestamps and ownership correctly. It also means we can correctly touch symlinks and block/character devices without triggering their drivers. Moreover, by operating on an O_PATH fd we can make sure that we operate on the same inode the whole time, and it can't be swapped out in the middle. While we are at it, rework the call so that we try to adjust as much as we can before returning on error. This is a good idea as we call the function quite often without checking its result, and hence it's best to leave the files around in the most "correct" fashion possible.
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