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# Functions for managing prokit sessions
#
# Copyright (C) 2014 Patrick "P. J." McDermott
#
# This file is part of the ProteanOS Development Kit.
#
# The ProteanOS Development Kit is free software: you can redistribute
# it and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# The ProteanOS Development Kit is distributed in the hope that it
# will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the ProteanOS Development Kit. If not, see
# <http://www.gnu.org/licenses/>.
[ "x${_SESSION_SM+set}" = 'xset' ] && return 0
_SESSION_SM=1
use rand
use mutex
use output
use locale
use profile
session_id=
session_root=
session_arch=
session_plat=
session_mountdir=
session_atexit=
session_sigs=
session_begin()
{
local root="${1}"
local mountdir="${2}"
local atexit="${3}"
local installing="${4}"
rand
session_id=${rand_x}
session_root="${root}"
session_arch="$(cat "${root}/etc/proteanos_arch")"
session_plat="$(cat "${root}/etc/proteanos_plat")"
session_mountdir="${mountdir}"
session_atexit="${atexit}"
[ -d "${session_root}/prokit" ] || mkdir "${session_root}/prokit"
if [ -f "${session_root}/prokit/installing" ] && ! ${installing}; then
error 2 "$(get_msg 'install_running')"
fi
session_set_sigs
if ! mutex_timedlock "${session_root}/prokit/sessions.lock" 5; then
error 2 "$(get_msg 'cant_lock_sessions')"
fi
# Check for a sessions pool.
if [ -d "${session_root}/prokit/sessions" ]; then
if ! profile_file_systems_mounted "${session_root}" \
"${session_arch}" "${session_plat}"; then
# If a sessions pool exists but the file systems aren't
# mounted, clean up the old sessions and mount the file
# systems.
rmdir "${session_root}/prokit/sessions/"*
session_mount
fi
else
# If the sessions pool doesn't exist, create it and mount the
# file systems.
mkdir "${session_root}/prokit/sessions"
session_mount
fi
# Register the session.
mkdir "${session_root}/prokit/sessions/${session_id}"
mkdir "${session_root}/prokit/sessions/${session_id}/wd"
profile_bind_mount "${session_arch}" "${session_plat}" \
"${session_mountdir}" \
"${session_root}/prokit/sessions/${session_id}/wd"
mutex_unlock "${session_root}/prokit/sessions.lock"
}
session_end()
{
trap : ${session_sigs}
${session_atexit}
# Unregister the session.
profile_bind_umount "${session_arch}" "${session_plat}" \
"${session_mountdir}" \
"${session_root}/prokit/sessions/${session_id}/wd"
rmdir "${session_root}/prokit/sessions/${session_id}/wd"
rmdir "${session_root}/prokit/sessions/${session_id}"
if ! mutex_is_unlockable "${session_root}/prokit/sessions.lock"; then
if ! mutex_timedlock "${session_root}/prokit/sessions.lock" 5
then
error 2 "$(get_msg 'cant_lock_sessions')"
fi
fi
# Clear the sessions pool. If there are no more sessions, unmount the
# file systems.
if rmdir "${session_root}/prokit/sessions" 2>/dev/null; then
session_umount
fi
mutex_unlock "${session_root}/prokit/sessions.lock"
trap - ${session_sigs}
}
session_id()
{
printf '%d\n' ${session_id}
return 0
}
session_dir()
{
printf '/prokit/sessions/%d\n' ${session_id}
return 0
}
session_exec()
{
local args=
local session_dir=
args=''
for arg in "${@}"; do
arg="'$(printf '%s\n' "${arg}" | sed "s/'/'\\\\''/g")'"
args="${args} ${arg}"
done
session_dir="/prokit/sessions/${session_id}/wd"
chroot "${session_root}" /bin/sh -c "cd ${session_dir}; ${args}"
}
session_mount()
{
local fs=
local dir=
local fstype=
local options=
while read fs dir fstype options; do
[ "x${dir}" = 'x' ] && continue
mount -t "${fstype}" -o "${options}" "${fs}" \
"${session_root}/${dir}"
done <<-EOF
$(profile_get_fstab "${session_arch}" "${session_plat}")
EOF
}
session_umount()
{
local fs=
local dir=
local fstype=
local options=
while read fs dir fstype options; do
[ "x${dir}" = 'x' ] && continue
# umount sometimes complains that the /dev file system is busy.
# Here's a kludge to try to handle that. We better make sure
# bind mounts get unmounted; otherwise, `rm -Rf ${root}` can be
# painful.
while ! umount "${session_root}/${dir}"; do
sleep 1
done
done <<-EOF
$(profile_get_fstab "${session_arch}" "${session_plat}" | \
sed -n '1!G;h;$p')
EOF
}
session_set_sigs()
{
local i=
local sig=
# We need the signal *number* in the signal handler. The only portable
# and easy way to get the number of a named signal is to search for it
# as in the following loop hack.
i=0
session_sigs=''
while [ ${i} -lt 127 ]; do
i=$(($i + 1))
sig="$(kill -l ${i} 2>/dev/null)" || continue
case "${sig}" in
'HUP' | 'INT' | 'QUIT' | 'ABRT' | 'ALRM' | 'TERM')
session_sigs="${session_sigs} ${i}"
trap "session_handle_sig ${i}" ${i}
;;
esac
done
}
session_handle_sig()
{
local sig="${1}"
session_end
if [ "x${exit_status:+set}" = 'xset' ]; then
exit ${exit_status}
else
exit $((128 + $sig))
fi
}
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