#388 prosodyctl getpid tries to open pidfile for writing

Reporter devurandom@gmx.net
Owner MattJ
Stars ★ (1)  
  • Status-New
  • Type-Defect
  • Priority-Medium
  1. devurandom@gmx.net on

    getpid from util.prosodyctl tries to open the pidfile for writing (read and append), while reading alone seems to be sufficient. This creates a problem if the pidfile was not created by the prosody user. Attached patch fixes this. {{{ --- prosody/util/prosodyctl.lua.orig 2014-01-23 20:19:32.000000000 +0100 +++ util/prosodyctl.lua 2014-01-23 20:18:58.000000000 +0100 @@ -194,7 +194,7 @@ return false, "no-posix"; end - local file, err = io.open(pidfile, "r+"); + local file, err = io.open(pidfile, "r"); if not file then return false, "pidfile-read-failed", err; end }}}

  2. MattJ on

    Hi, thanks for the report. This is actually intentional (and maybe we should clarify it with a comment). It is so we can lock the file to see if Prosody has a lock on it or not. See: https://hg.prosody.im/0.9/rev/1e287badd033

    • owner MattJ
  3. devurandom@gmx.net on

    It worked fine here with above patch. Is a writable file handle really necessary to acquire a lock?

  4. Zash on

    Testing suggest that the above patch should make it fail with "Bad file descriptor" and won't work unless the lfs.lock() call is also changed to "r".

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