Share files between host system and docker container using specific UID

Question

I\'m trying to share files within a Docker guest using the volume sharing. In order to get the same UID, and therefore interoperability with those files, I would like to cr

Answer 1

I slightly modified @ISanych answer:

#!/usr/bin/env bash

user_exists() {
  id -u $1 > /dev/null 2>&1
}

group_exists() {
  id -g $1 > /dev/null 2>&1
}

setuser() {
  if [[ "$#" != 3 ]]; then
    echo "Usage: $0   "
    return
  fi
  local dest_uid=$(stat -c "%u" $1)
  local dest_gid=$(stat -c "%g" $1)
  if user_exists $dest_uid; then
    id -nu $dest_uid
    return
  fi
  local dest_user=$2
  local dest_group=$3

  if user_exists $dest_user; then
    userdel $dest_user
  fi

  if group_exists $dest_group; then
    groupdel $dest_user
  fi

  groupadd -g $dest_gid $dest_group
  useradd -u $dest_uid -g $dest_gid -s $DEFAULT_SHELL -d $DEFAULT_HOME -G root $dest_user
  chown -R $dest_uid:$dest_gid $DEFAULT_HOME
  id -nu $dest_user
}

REAL_USER=$(setuser $SRC_DIR $DEFAULT_USER $DEFAULT_GROUP)

setuser function accepts user and group names that you want to assign to uid and gid of provided directory. Then if user with such uid exists then it simply returns login corresponding to this uid, otherwise it creates user and group and returns login originally passed to function.

So you get the login of user that owns destination directory.