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#!/bin/sh -ex
# This script is used for running commands inside the container as a user with
# specified UID and GID so the files created from inside the container have the
# same owner and group as the files created outside of the container. This makes
# it easy to manipulate the files as the user outside the container.
if [ $# -lt 3 ]; then
echo "Usage: $0 UID GID CMD [ARGS...] " >&2
exit 1
fi
UID=$1
GID=$2
USER_NAME=new-user
GROUP_NAME=new-group
shift 2
if ! getent passwd $UID >/dev/null; then
# The UID does not exist, create it
useradd -m -u $UID $USER_NAME
else
USER_NAME=$(id -n -u $UID)
fi
if ! getent group $GID >/dev/null; then
# The GID does not exist, create it
groupadd -g $GID $GROUP_NAME
else
GROUP_NAME=$(getent group $GID | cut -d: -f1)
fi
# Make sure the group is the user's primary group
usermod -g $GROUP_NAME $USER_NAME
# Check that the user has expected UID and GID
ACTUAL_UID=$(su -c 'id -u' $USER_NAME)
if [ $ACTUAL_UID -ne $UID ]; then
echo "Error: Actual UID $ACTUAL_UID != $UID"
exit 1
fi
ACTUAL_GID=$(su -c 'id -g' $USER_NAME)
if [ $ACTUAL_GID -ne $GID ]; then
echo "Error: Actual GID $ACTUAL_GID != $GID"
exit 1
fi
if [ ! -e /.cache ]; then
# Needed for running pre-commit
mkdir /.cache
chown $USER_NAME: /.cache
fi
su -c "$*" $USER_NAME
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