#!/bin/bash

now="$(date +%s >&1)"
username=builduser_${now}
usergroup=buildgroup_${now}
builddir=$(pwd)
homedir=/home/${username}
sshdir=${homedir}/.ssh

# Figure out the uid/gid we need to use by integrating the path that has
# been bind mounted in. This is then used for the builduser.
BUILD_UID=$(stat --printf=%u ${builddir} 2> /dev/null)
BUILD_GID=$(stat --printf=%g ${builddir} 2> /dev/null)

# Add docker container group/user.
groupadd --gid ${BUILD_GID} --non-unique ${usergroup}
useradd -s /bin/bash --home ${homedir} --non-unique --uid ${BUILD_UID} \
	--gid ${BUILD_GID} --groups sudo ${username}

# Give users in the sudo group sudo access in the container.
echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers

# Copy ssh key files.
mkdir -p ${homedir}
mkdir -p ${sshdir}
cp /var/ssh/* ${sshdir}/
chown -R ${username}:${usergroup} ${homedir}

# Determine parallel build capabilities.
parallel_build="$(nproc >&1)"

if [ ${parallel_build} -gt 20 ]
then
	BB_NUMBER_THREADS=20
	PARALLEL_MAKE=20
else
	BB_NUMBER_THREADS=${parallel_build}
	PARALLEL_MAKE=${parallel_build}
fi

export BB_NUMBER_THREADS
export PARALLEL_MAKE

# Execute CMD
su ${username} -c "$@"