Arch Linux

Description: I've tried installing several vim plugins, e.g. vim-ctrlp, vim-tagbar from the official repos, vim-vimtex, vim-delimitmate-git, vim-csv from the AUR. In all cases, vimdoc.hook produced an error.

Additional info:
* package version(s): all `vim-*` plugins tested.
* config and/or log files etc.: N/A
* link to forum post: https://bbs.archlinux.org/viewtopic.php?pid=2039339

Steps to reproduce:
```
$ sudo pacman -S vim-ctrlp
...
:: Processing package changes...
(1/1) installing vim-ctrlp [################################################] 100%
Optional dependencies for vim-ctrlp
ctags: for searching tags [installed]
:: Running post-transaction hooks...
(1/2) Arming ConditionNeedsUpdate...
(2/2) Updating Vim help tags...
error: command failed to execute correctly
```

More information:
I looked at the hook file at `/usr/share/libalpm/hooks/vimdoc.hook`, and ran the command manually.

sudo bash -c '/usr/bin/vim -es --cmd ":helptags /usr/share/vim/vimfiles/doc" --cmd ":q"'

but this did not produce an error.