# nbdkit
# @configure_input@
# Copyright Red Hat
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# * Neither the name of Red Hat nor the names of its contributors may be
# used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

# Common functions and variables used by tests.
#
# Most test scripts (tests/*.sh files) start with:
#
# source ./functions.sh
# set -e
# set -x
# set -u

#----------------------------------------------------------------------
# Variable declarations.

# Various variables defined by autoconf that test scripts might want
# to use.
abs_top_srcdir="@abs_top_srcdir@"

CXX="@CXX@"
OCAMLOPT="@OCAMLOPT@"
OCAML_STD_INCLUDES="@OCAML_STD_INCLUDES@"
OCAML_PLUGIN_LIBRARIES="@OCAML_PLUGIN_LIBRARIES@"
PYTHON="@PYTHON@"

SOEXT="@SOEXT@"
EXEEXT="@EXEEXT@"

CUT="@CUT@"
QEMU_IMG="@QEMU_IMG@"
SED="@SED@"
STAT="@STAT@"
TRUNCATE="@TRUNCATE@"

# Largest size of disk that nbdkit supports, 2^63-1.
#
# Because we might be using a 32 bit shell, express this as a constant
# rather than using $(()) calculations.
largest_disk=9223372036854775807

# Largest size of disk that qemu supports.
#
# Up to qemu 5.2.0 that was 2^63 - 512 (because of the requirement for
# a whole number of sectors).  qemu > 5.2.0 reduced this to 2^63 - 2^30
# https://git.qemu.org/?p=qemu.git;a=commitdiff;h=8b1170012b1de6649c66ac1887f4df7e312abf3b
#
# qemu-io has further bugs which limit what we can test.  See this
# thread:
# https://www.mail-archive.com/qemu-devel@nongnu.org/msg770572.html
#
# Because we might be using a 32 bit shell, express this as a constant
# rather than using $(()) calculations.
largest_qemu_disk=9223372035781033984

# The TLS certificates directory.  However this is only valid if you
# use 'requires_tls_certificates'.
pkidir="@abs_top_builddir@/tests/pki"

# The TLS PSK keys file.  However this is only valid if you use
# 'requires_tls_psk'.
pskfile="@abs_top_builddir@/tests/keys.psk"

#----------------------------------------------------------------------
# Cleanup primitives; functions to start and stop an nbdkit background
# process.

# cleanup_fn cmd [args]
#
# Run the command ‘cmd [args]’ when the test script exits.  This is
# run in all cases when the script exits, so is a reliable way to
# clean up test files, external processes etc.  Cleanup hooks are run
# in the order of registration.
#
# Examples:
#   cleanup_fn rm -f test.out
#   cleanup_fn kill $pid
_cleanup_hook_count=0
cleanup_fn ()
{
    local _hook=_cleanup_hook$((_cleanup_hook_count++))
    declare -ag $_hook
    eval $_hook'=("$@")'
}

_run_cleanup_hooks ()
{
    local _status=$? _i

    set +e
    trap '' INT QUIT TERM EXIT ERR
    echo $0: run cleanup hooks: exit code $_status

    for (( _i = 0; _i < $_cleanup_hook_count; ++_i )); do
        eval '"${_cleanup_hook'$_i'[@]}"'
    done

    exit $_status
}
trap _run_cleanup_hooks INT QUIT TERM EXIT ERR

# start_nbdkit -P pidfile args...
#
# Run nbdkit with args and wait for it to start up.  If it fails to
# start up, exit with an error message.  Also a cleanup handler is
# installed automatically which kills nbdkit on exit.
start_nbdkit ()
{
    local _is_windows _pidfile _i

    # Save whether we are running on Windows.  We have to do this test
    # here because 'is_windows' under valgrind doesn't always work
    # when we are running cleanup functions.
    if is_windows; then _is_windows=1; else _is_windows=; fi

    # -P <pidfile> must be the first two parameters.
    if [ "$1" != "-P" ]; then
       echo "$0: start_nbdkit: -P <pidfile> option must be first"
       exit 1
    fi
    _pidfile="$2"

    # Run nbdkit.
    #
    # Until Windows supports daemonization we run nbdkit in the
    # foreground (-f) and background it ourselves.
    if ! test "$_is_windows"; then nbdkit -v "$@"; else nbdkit -f -v "$@" & fi

    # Wait for the pidfile to appear.
    for _i in {1..60}; do
        if test -s "$_pidfile"; then
            break
        fi
        sleep 1
    done
    if ! test -s "$_pidfile"; then
        echo "$0: start_nbdkit: PID file $_pidfile was not created"
        exit 1
    fi

    # Kill nbdkit on exit.
    if ! test "$_is_windows"; then
        cleanup_fn _kill_nbdkit_unix "$(cat "$_pidfile")"
    else
        cleanup_fn _kill_nbdkit_windows "$(cat "$_pidfile")"
    fi
}

# _kill_nbdkit_unix pid
#
# End the nbdkit process with the given pid.  Exit this script with an
# error if nbdkit does not gracefully shutdown in a timely manner.
_kill_nbdkit_unix ()
{
    local pid=$1 i

    # Start with SIGTERM, and wait for graceful exit
    kill $pid
    for i in {1..60}; do
        if ! kill -0 $pid 2>/dev/null; then
            break
        fi
        sleep 1
    done
    # If nbdkit has not exited, try SIGKILL and fail the test
    if test $i = 60; then
        echo "error: nbdkit pid $pid failed to respond to SIGTERM"
        kill -9 $pid
        # Append our failure after other cleanups
        cleanup_fn exit 1
    fi
}

# Same as above, for Windows.
_kill_nbdkit_windows ()
{
    wine taskkill /f /pid $1
}

#----------------------------------------------------------------------
# Safely prepend on a colon-separated path variable
# eg:
# prepend PATH "$srcdir/foo"

prepend()
{
    eval $1="$2\${$1:+:\$$1}"
}

#----------------------------------------------------------------------
# Define a variable from a heredoc.
# eg:
# define var <<'EOF'
# ...anything here...
# EOF
# https://stackoverflow.com/a/8088167

define()
{
    IFS= read -r -d '' ${1} || true
}

#----------------------------------------------------------------------
# Test prerequisites.
#
# Various 'requires' and related functions that can be used at the top
# of tests to check whether the test is able to run on this platform,
# or should be skipped.

# requires program [args]
#
# Check that ‘program [args]’ works.  If not, skip the test.
# For example to check that 'jq' is available, do:
#
#   requires jq --version
requires ()
{
    ( "$@" ) </dev/null >/dev/null 2>&1 || {
        echo "$0: ‘$*’ failed with error code $?"
        echo "$0: test prerequisite is missing or not working"
        exit 77
    }
}

# Opposite of requires - the test must not succeed.
requires_not ()
{
    if ( "$@" ) </dev/null >/dev/null 2>&1 ; then
        echo "$0: test prerequisite is missing or not working"
        exit 77
    fi
}

# qemu cannot connect to ::1 if IPv6 is disabled because of the way it
# uses getaddrinfo.  This checks that the IPv6 loopback address is
# available and qemu can connect to it, else it skips.
#
# See:
# https://bugzilla.redhat.com/show_bug.cgi?id=808147
# https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/SXDLSZ3GKXL6NDAKP4MPJ25IMHKN67X3/
requires_ipv6_loopback ()
{
    requires "$QEMU_IMG" --version

    # This should fail with "Connection refused".  If IPv6 is broken
    # then it fails with "Address family for hostname not supported"
    # instead.  It's very unlikely that port 1 is open.
    if LANG=C "$QEMU_IMG" info "nbd:[::1]:1" |& \
       grep -sq "Address family for hostname not supported"; then
        echo "$0: IPv6 loopback is not available, skipping this test"
        exit 77
    fi
}

# Test that /bin/sh is really bash.
#
# While we run test-*.sh scripts with explicit bash, nbdkit itself
# doesn't depend on bash.  When nbdkit runs a script (eg. --run
# parameter, or nbdkit-sh-plugin), it uses system(3) which uses
# /bin/sh.  However sometimes we would like to use /bin/bash in
# scripts that are run from nbdkit, in the test suite.  That's the
# only place you need to use this test.
requires_bin_sh_is_bash ()
{
    BASH_VERSION=no requires /bin/sh -c 'test "x$BASH_VERSION" != "xno"'
}

# Test host kernel is Linux and minimum version.
#
# It's usually better to test features rather than using this, but
# there are cases where testing features of the current kernel is too
# hard.
requires_linux_kernel_version ()
{
    local kver
    local min="$1"

    # Check that nbdkit was built for Linux.  This can appear to be a
    # peculiar test, but if we cross-compiled nbdkit for Windows and
    # are running it under Wine then the host kernel will still be
    # Linux, but the test will fail anyway.
    host_os="$(nbdkit --dump-config | grep ^host_os | $CUT -d= -f2)"
    if [[ ! "$host_os" =~ linux ]]; then
        echo "$0: binary was built for $host_os (not Linux), skipping test"
        exit 77
    fi

    # Test the host kernel is Linux.
    requires test "$(uname -s)" = "Linux"

    # Test that it's the minimum version.
    # https://stackoverflow.com/a/24067243
    requires $CUT --version
    requires sort -V /dev/null
    kver=$(uname -r | $CUT -d. -f1-2)
    requires test "$(printf "$kver\n$min" | sort -V | head -n 1)" = "$min"
}

# For any test using TLS.
requires_tls ()
{
    # Does the nbdkit binary support TLS?
    if ! nbdkit --dump-config | grep -sq tls=yes; then
        echo "$0: nbdkit built without TLS support"
        exit 77
    fi
}

# For tests that need the TLS certificates, use this.
# Note that $pkidir points to the certificates directory.
requires_tls_certificates ()
{
    requires_tls
    if [ ! -f "$pkidir/ca-cert.pem" ]; then
        echo "$0: PKI files were not created by the test harness"
        exit 77
    fi
}

# For tests that need the TLS PSK keys file.
# Note that $pskfile points to the file.
requires_tls_psk ()
{
    requires_tls
    if [ ! -s "$pskfile" ]; then
        echo "$0: PSK keys file was not created by the test harness"
        exit 77
    fi
}

# Test if nbdsh was compiled with support for URIs.
requires_nbdsh_uri ()
{
    requires nbdsh -c 'exit(not h.supports_uri())'
}

# Test if nbdinfo is available
requires_nbdinfo ()
{
    requires nbdinfo --version
    # Our most common use of nbdinfo is with URIs, so require that too
    requires_nbdsh_uri
}

# Test if nbdcopy is available
requires_nbdcopy ()
{
    requires nbdcopy --version
    # Our most common use of nbdcopy is with URIs, so require that too
    requires_nbdsh_uri
}

# Test if nbdcopy supports null: pseudo-target (added 1.8, not in RHEL 8)
requires_nbdcopy_null_output ()
{
    requires_nbdcopy
    requires_libnbd_version 1.8
}

# Test if a plugin has been built locally.
requires_plugin ()
{
    # See nbdkit-probing(1).
    requires nbdkit "$1" --version
}

# Test if a filter has been built locally.
requires_filter ()
{
    # See nbdkit-probing(1).
    requires nbdkit --filter="$1" null --version
}

# Return true if nbdkit was built (or cross-compiled) for Windows.
is_windows ()
{
    # Test that nbdkit is generally working on this platform, in
    # case Wine is broken again.
    if ! nbdkit --dump-config; then
        echo "$0: something is broken about nbdkit on this platform" >&2
        exit 1
    fi

    host_os="$(nbdkit --dump-config | grep ^host_os | $CUT -d= -f2)"
    [[ "$host_os" =~ mingw|msys ]]
}

# The Windows port does not yet support --run (captive nbdkit).  Add a
# uniquely named requires test for this.
requires_run ()
{
    if is_windows; then
        echo "$0: Windows port does not support --run (captive nbdkit)"
        exit 77
    fi
}

# The Windows port does not yet support -s (single mode).  Add a
# uniquely named requires test for this.
requires_single_mode ()
{
    if is_windows; then
        echo "$0: Windows port does not support -s (single mode)"
        exit 77
    fi
}

# Check for minimum version of libnbd (also nbdsh, nbdinfo, nbdcopy etc.)
# eg: requires_libnbd_version 1.6
requires_libnbd_version ()
{
    requires nbdsh --version
    requires $PYTHON --version
    requires $PYTHON -c 'from packaging import version'
    export v="$1"
    if ! nbdsh -c '
import os
import sys
from packaging import version
v=os.getenv("v")
vv=h.get_version()
if version.parse(vv) < version.parse(v):
    print("libnbd is too old to run this test: %s < %s" % (vv, v))
    sys.exit(1)
'; then exit 77; fi
}

# Tests may fail when the test suite is run as root.  While it's a bad
# idea to run the whole test suite as root (except for the specific
# "make check-root" tests), people do it anyway so for tests that we
# know cannot work if run as root we can use this to skip.
requires_non_root ()
{
    if test $(id -u) -eq 0; then
        echo "$0: test skipped because running as root"
        echo "$0: tip: don't run the general test suite as root"
        exit 77
    fi
}

# Tests that run under check-root should use this.
requires_root ()
{
    if test $(id -u) -ne 0; then
        echo "$0: test skipped because not running as root"
        echo "$0: use ‘sudo make check-root’ to run these tests"
        exit 77
    fi
}

# Tests that use the vsock interface will fail if vsock is not
# supported.  On Linux you have to load the kernel module
# vsock_loopback.  See also
# https://bugzilla.redhat.com/show_bug.cgi?id=2069558
requires_vsock_support ()
{
    if ! grep -q ^AF_VSOCK /proc/net/protocols ||
       ! lsmod | grep -q ^vsock_loopback; then
        echo "$0: test skipped because AF_VSOCK is not supported."
        exit 77
    fi
}

# requires_caps
#
# Check for linux capabilities.  Parameters are in the form of "cap_name", e.g.
#   requires_caps cap_net_admin cap_chown
#
# This should be coupled with requires_root as it will not fail when capsh
# utility from libcapng is not installed or the capabilities are not found in
# /proc/<pid>/status (to future-proof this against non-Linux platforms).
requires_caps ()
{
    test -r /proc/$$/status || return 0
    type capsh 2>/dev/null >&2 || return 0

    local cap_eff
    local cap_str

    cap_eff="$($SED -n 's/CapEff:\s*\([^0-9a-fA-F]*\)/\1/p' /proc/$$/status)"
    test -z "$cap_eff" && return 0

    cap_str=$(capsh --decode="$cap_eff")
    while test "$#" -gt 0; do
        if [[ ! "$cap_str" =~ [,=]$1(,|$) ]]; then
            echo "$0: test skipped because of missing capability: $1"
            exit 77
        fi
        shift
    done
}

# Test the curl plugin supports a particular protocol.  Some versions
# of curl are compiled "minimally", leaving out protocols that you
# might expect to be present (https://lwn.net/Articles/887313/).
requires_curl_protocol ()
{
    name="$1"

    requires_plugin curl
    if ! nbdkit curl --dump-plugin | grep "curl_protocol_$name=yes"; then
        echo "$0: skipping test: curl does not support protocol \"$name\""
        exit 77
    fi
}

# skip_if_valgrind ["reason"]
#
# Skip test under 'make check-valgrind'.  An optional reason can be given.
skip_if_valgrind ()
{
    if [ "${NBDKIT_VALGRIND:-0}" = "1" ]; then
        echo "$0: skipping test under valgrind $@"
        exit 77
    fi
}

# Some tests assume that common/allocators/sparse.c: SPARSE_PAGE is
# defined as 32768.  If we ever changed that definition the test would
# break.  Fail noisily instead.  Note this is *not* a skip.
error_if_sparse_page_not_32768 ()
{
    requires nbdsh -c 'print(h.get_block_size)'
    nbdkit memory 0 allocator=sparse --run '
        nbdsh -c "h.connect_unix(\"$unixsocket\")" \
              -c "assert h.get_block_size(nbd.SIZE_PREFERRED) == 32768"
    '
}

#----------------------------------------------------------------------
# Miscellaneous functions.

# foreach_plugin f [args]
#
# For each plugin that was built, run the function or command f with
# the plugin name as the first argument, optionally followed by the
# remaining args.
foreach_plugin ()
{
    local f d p

    f="$1"
    shift

    for p in @plugins@; do
        # Was the plugin built?
        d="@top_builddir@/plugins/$p"
        if [ -f "$d/.libs/nbdkit-$p-plugin.$SOEXT" ] ||
           [ -f "$d/nbdkit-$p-plugin" ]; then
            # Yes so run the test.
            "$f" "$p" "$@"
        fi
    done
}

# foreach_filter f [args]
#
# For each filter that was built, run the function or command f with
# the filter name as the first argument, optionally followed by the
# remaining args.
foreach_filter ()
{
    local f d fi

    f="$1"
    shift

    for fi in @filters@; do
        # Was the filter built?
        d="@top_builddir@/filters/$fi"
        if [ -f "$d/.libs/nbdkit-$fi-filter.$SOEXT" ]; then
            # Yes so run the test.
            "$f" "$fi" "$@"
        fi
    done
}

# pick_unused_port
#
# Picks and returns an "unused" port, setting the global variable
# $port.
#
# This is inherently racy so we only use it where it's absolutely
# necessary.
pick_unused_port ()
{
    requires ss --version

    # Start at a random port to make it less likely that two parallel
    # tests will conflict.
    port=$(( 50000 + (RANDOM%15000) ))
    while ss -ltn | grep -sqE ":$port\b"; do
        ((port++))
        if [ $port -eq 65000 ]; then port=50000; fi
    done
    echo picked unused port $port
}
