Re: Editing config files for docker containers with vim

Den fre 9 sep. 2022 10:50Jirka Novak <j.novak@netsystem.cz> skrev:

Hi,

   I'm maintaining set of docker containers. We use convention that
every config file for a container is in /srv/<container>/ subdirectory.
E.g. /srv/<container>/etc/cron.daily/logrotate.
   We use vim to maintain config files and we like feature/shortcut 'gf'
which opens file on cursor. E.g. logrotate file contains:

#!/bin/sh

/usr/sbin/logrotate /etc/logrotate.conf
EXITVALUE=$?
if [ $EXITVALUE != 0 ]; then
     /usr/bin/logger -t logrotate "ALERT exited abnormally with
[$EXITVALUE]"
fi
exit $EXITVALUE

   therefore when I use 'gf' on /etc/logrotate.conf, file should be opened.

   The issue is that path is correct when container is running, but when
I'm editing it from the host, it should be
/srv/<container>/etc/logrotate.conf.
   Therefore I'm looking for vim setting or extension of vim which will
add requested prefix to file name when I'm opening it.

   Any advice is welcome.

Assuming that the current file is somewhere under /srv/<container>/

    fun! DockerGf ()

      " save the current register contents

      let old_reg = @"

      " get the path under the cursor

      norm! ByE

      " remove the leading slash if any

      let path = substitute(@",'^/\?','','')

      " restore the previous register contents

      let @" = old_reg

      " get the container directory path

      let parent = substitute(expand('%:p'),'^/srv/[^/]*/\zs.*','','')

      " go to the file

      exe 'edit ' . parent . path

    endfun

    " define custom mapping to open path under cursor in container

    nnor ,dgf :call DockerGf()<cr>

If the assumption that the current file is under the container directory may be

wrong you can use a global variable with the path to the container instead:

    :let g:container_path = '/srv/<container>/'

    

and replace the two lines in the function above containing "parent" with

just

      exe 'edit ' . g:container_path . path

There may be more elegant ways...

                                        Best regards,

                                                Jirka Novak

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