#!/bin/bash

# Location of files which contains list of protected files
PROTECTED_FILE_LIST='/etc/qubes/protected-files.d'

qsvc() {
    # Returns whether a service is enabled.
    # Usage: qsvc <nameofservice>
    #
    # Must only be used after qubes-sysinit has started.
    # See qsvc_early for more information.
    local count=100
    while [ ! -e /var/run/qubes-service-environment ] ; do
        if [ "$count" = "0" ] ; then
            echo "qsvc: Warning: qubes-sysinit has not finished executing yet" >&2
            break
        fi
        sleep 0.1
        count=$(( count - 1 ))
    done
    [ -e /var/run/qubes-service/"$1" ]
}

under_systemd() {
    pidof systemd >/dev/null 2>&1
}

systemd_version_changed() {
    under_systemd || return
    systemd_pkg_version=`systemctl --version|head -n 1`
    if dmesg | grep -q "$systemd_pkg_version running in system mode."; then
        return 1
    fi
    return 0
}

possibly_run_save_script() {
    ENCODED_SCRIPT=$(qubesdb-read /qubes-save-script)
    if [ -z "$ENCODED_SCRIPT" ] ; then return ; fi
    tmpfile=$(mktemp /tmp/qubes-save-script.XXXXXXXXX)
    echo $ENCODED_SCRIPT|perl -e 'use MIME::Base64 qw(decode_base64); local($/) = undef;print decode_base64(<STDIN>)' >"$tmpfile"
    chmod 755 "$tmpfile"
    DISPLAY=:0 su - user -c "$tmpfile"
    ret=$?
    rm -f "$tmpfile"
    return $ret
}

have_qubesdb() {
    # Tests whether qubesdb-read exists and can be executed.
    type qubesdb-read >/dev/null 2>&1
}

have_qrexec_agent() {
    # Tests whether qrexec-agent exists and can be executed.
    PATH=/usr/lib/qubes type qrexec-agent >/dev/null 2>&1
}

qubes_vm_type() {
    qubesdb-read /qubes-vm-type
}

is_netvm() {
    [ "$(qubes_vm_type)" = "NetVM" ]
}

is_appvm() {
    [ "$(qubes_vm_type)" = "AppVM" ]
}

is_proxyvm() {
    [ "$(qubes_vm_type)" = "ProxyVM" ]
}

is_templatevm() {
    [ "$(qubes_vm_type)" = "TemplateVM" ]
}

is_dispvm() {
    [ "$(qubes_vm_type)" = "DisposableVM" ]
}

is_fully_persistent() {
    [ "$(qubesdb-read /qubes-vm-persistence)" = "full" ]
}

is_rwonly_persistent() {
    [ "$(qubesdb-read /qubes-vm-persistence)" = "rw-only" ]
}

is_updateable() {
    [ "$(qubesdb-read /qubes-vm-updateable)" = "True" ]
}

reload_random_seed() {
    local seed
    local decoded
    seed=$(qubesdb-read /qubes-random-seed)
    decoded=$(echo "$seed" | base64 -d)
    echo "$decoded" > /dev/urandom
    qubesdb-rm /qubes-random-seed
}

is_protected_file() {
    grep -Fxrq --exclude='*.rpmsave' --exclude='*~' --exclude='*.rpmnew' --exclude='*.rpmold' -- "${1}" "$PROTECTED_FILE_LIST" 2>/dev/null
}

umount_retry() {
    local count=5
    while mountpoint -q "$1" ; do
        if umount "$1" ; then break ; fi
        echo "Something prevents unmounting $1:" >&2
        fuser -vmM "$1" >&2
        if [ "$count" = "0" ] ; then
            return 1
        fi
        sleep 5
        count=$(( count - 1 ))
    done
    return 0
}