[Bug 1775554] Re: mpv zsh completion hangs with specially crafter dirnames

[Daniel van Vugt]

** Also affects: zsh (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  mpv zsh completion hangs with specially crafter dirnames

Status in mpv package in Ubuntu:
  New
Status in zsh package in Ubuntu:
  New

Bug description:
  This is regarding /usr/share/zsh/vendor-completions/_mpv which is in
  the package "mpv".

  If you make a dirname with lots of dots and open bracket and close
  bracket, like:

  /tmp/XXX.X.X.X.X.X.XX.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.XX-X.X.X.X.X.X.X[XXXXX]

  Put some media files inside, and try to autocomplete with:

  mpv
  /tmp/XXX.X.X.X.X.X.XX.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.XX-X.X.X.X.X.X.X\[XXXXX\]/<TAB>

  zsh gets into a loop that depending on the disk might take dozens of
  minutes or hours to complete. In a network file system it might
  practically hangs forever. Using zsh -xv to check the completion I see
  that the completion has increasingly bigger hangs after this part
  repeats:

  +compadd:9> PREFIX='(#a20)/tmp/XXX.X.X.X.X.X.XX.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.X.XX-X.X.X.X.X.X.X\[XXXXX\]/'
  +compadd:12> ((  1 && 5  ))
  +compadd:13> _correct_expl[_correct_group]=-J
  +compadd:15> compadd -J corrections -X '- corrections - (errors 20})' -S '' -J urls -X '- URL -' cdda:// rtmp:// rtsp:// https:// mms:// mmst:// mmshttp:// rtp:// httpproxy:// hls:// rtmpe:// rtmps:// rtmpt:// rtmpte:// rtmpts:// srtp:// data:// lavf:// ffmpeg:// udp:// ftp:// tcp:// tls:// unix:// sftp:// md5:// concat:// avdevice:// av:// dvb:// smb:// file:// dvdread:// file:// dvd:// dvdnav:// file:// bd:// br:// bluray:// bdnav:// brnav:// bluraynav:// memory:// hex:// null:// mf:// edl:// rar:// file:// fd:// fdclose://

  The delay to get to the next part seems to increase exponentially. I
  am attaching an excerpt of the zsh -xv run. A similar symptom happens
  with mplayer but it does not take as long - a couple minutes instead
  of more than half an hour. After it finishes, it doesn't match any
  media file, although there are mkv files in there: No matches for:
  `video file', `media file', `URL', `URL prefix', or `corrections'

  This does not seem to occur with any other programs, media or
  otherwise. For media players I tried ffmpeg kmplayer totem xine avconv
  avplay.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: mpv 0.27.2-1ubuntu1 [modified: usr/share/zsh/vendor-completions/_mpv]
  ProcVersionSignature: Ubuntu 4.15.0-22.24-lowlatency 4.15.17
  Uname: Linux 4.15.0-22-lowlatency x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.1
  Architecture: amd64
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Thu Jun  7 05:41:36 2018
  InstallationDate: Installed on 2018-01-08 (150 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  SourcePackage: mpv
  UpgradeStatus: Upgraded to bionic on 2018-06-03 (4 days ago)

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