Run as me inside docker

docker_me.sh

#!/bin/bash

# Create a temporary directory and store its name in a variable ...
TMPDIR=$(mktemp -d)

# Bail out if the temp directory wasn't created successfully.
if [[ ! -d "$TMPDIR" ]]; then
    >&2 echo "Failed to create temp directory"
    exit 1
fi

# deletes the temp directory
function cleanup {
  rm -rf "$TMPDIR"
  echo "Deleted temp working directory $TMPDIR"
}

# register the cleanup function to be called on the EXIT signal
trap cleanup EXIT

# Now do real work

# extract command line
# e.g. ./docker_me.sh "--rm -it -v `pwd`:`pwd` -w `pwd` -e HOME=`pwd`" ubuntu "id; pwd; ls -al"
OPTIONS="$1"
IMAGE="$2"
COMMAND="$3"

echo "Creating identity in temp directory $TMPDIR"

TMP_IMAGE=$(docker create $IMAGE)

docker cp $TMP_IMAGE:/etc/passwd $TMPDIR
docker cp $TMP_IMAGE:/etc/group $TMPDIR

docker container rm $TMP_IMAGE >/dev/null

# Copy just this user's ID across
#grep "$USER:x:$(id -u $USER):" /etc/passwd | tee -a $TMPDIR/passwd
#grep "$USER:x:$(id -g $USER):" /etc/group | tee -a $TMPDIR/group

# Pull everyone across, append the local names to the images
cat /etc/passwd >> $TMPDIR/passwd
cat /etc/group >> $TMPDIR/group

# Get my PID and GID
PID_GID="$(id -u $USER):$(id -g $USER)"

# print out the command line
( set -x
  docker run --user $PID_GID -v "$TMPDIR"/passwd:/etc/passwd -v "$TMPDIR"/group:/etc/group \
    $OPTIONS "$IMAGE" /bin/sh -c "$COMMAND"
)

# Cleanup will happen now.