test: check openssl prequisite for add_gpgsm_home

[notmuch] / test / test-lib.sh

#
# Copyright (c) 2005 Junio C Hamano
# Copyright (c) 2010 Notmuch Developers
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program.  If not, see https://www.gnu.org/licenses/ .

if [ ${BASH_VERSINFO[0]} -lt 4 ]; then
    echo "Error: The notmuch test suite requires a bash version >= 4.0"
    echo "due to use of associative arrays within the test suite."
    echo "Please try again with a newer bash (or help us fix the"
    echo "test suite to be more portable). Thanks."
    exit 1
fi

# Make sure echo builtin does not expand backslash-escape sequences by default.
shopt -u xpg_echo

# Ensure NOTMUCH_SRCDIR and NOTMUCH_BUILDDIR are set.
. $(dirname "$0")/export-dirs.sh || exit 1

# It appears that people try to run tests without building...
if [[ ! -x "$NOTMUCH_BUILDDIR/notmuch" ]]; then
        echo >&2 'You do not seem to have built notmuch yet.'
        exit 1
fi

this_test=${0##*/}
this_test=${this_test%.sh}
this_test_bare=${this_test#T[0-9][0-9][0-9]-}

# if --tee was passed, write the output not only to the terminal, but
# additionally to the file test-results/$BASENAME.out, too.
case "$GIT_TEST_TEE_STARTED, $* " in
done,*)
        # do not redirect again
        ;;
*' --tee '*|*' --va'*)
        mkdir -p test-results
        BASE=test-results/$this_test
        (GIT_TEST_TEE_STARTED=done "$BASH" "$0" "$@" 2>&1;
         echo $? > $BASE.exit) | tee $BASE.out
        test "$(cat $BASE.exit)" = 0
        exit
        ;;
esac

# STDIN from /dev/null. EOF for readers (and ENOTTY for tty related ioctls).
exec </dev/null

# Save STDOUT to fd 6 and STDERR to fd 7.
exec 6>&1 7>&2
# Make xtrace debugging (when used) use redirected STDERR, with verbose lead:
BASH_XTRACEFD=7
export PS4='+(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'

# Keep the original TERM for say_color and test_emacs
ORIGINAL_TERM=$TERM

# Set SMART_TERM to vt100 for known dumb/unknown terminal.
# Otherwise use whatever TERM is currently used so that
# users' actual TERM environments are being used in tests.
case ${TERM-} in
        '' | dumb | unknown )
                SMART_TERM=vt100 ;;
        *)
                SMART_TERM=$TERM ;;
esac

# For repeatability, reset the environment to known value.
LANG=C
LC_ALL=C
PAGER=cat
TZ=UTC
TERM=dumb
export LANG LC_ALL PAGER TERM TZ
GIT_TEST_CMP=${GIT_TEST_CMP:-diff -u}
if [[ ( -n "$TEST_EMACS" && -z "$TEST_EMACSCLIENT" ) || \
      ( -z "$TEST_EMACS" && -n "$TEST_EMACSCLIENT" ) ]]; then
    echo "error: must specify both or neither of TEST_EMACS and TEST_EMACSCLIENT" >&2
    exit 1
fi
TEST_EMACS=${TEST_EMACS:-${EMACS:-emacs}}
TEST_EMACSCLIENT=${TEST_EMACSCLIENT:-emacsclient}
TEST_GDB=${TEST_GDB:-gdb}
TEST_CC=${TEST_CC:-cc}
TEST_CFLAGS=${TEST_CFLAGS:-"-g -O0"}
TEST_SHIM_CFLAGS=${TEST_SHIM_CFLAGS:-"-fpic -shared"}
TEST_SHIM_LDFLAGS=${TEST_SHIM_LDFLAGS:-"-ldl"}

# Protect ourselves from common misconfiguration to export
# CDPATH into the environment
unset CDPATH

unset GREP_OPTIONS

# For lib/open.cc:_load_key_file
unset XDG_CONFIG_HOME

# For emacsclient
unset ALTERNATE_EDITOR

# for reproducibility
unset EMAIL

add_gnupg_home ()
{
    [ -e "${GNUPGHOME}/gpg.conf" ] && return
    _gnupg_exit () { gpgconf --kill all 2>/dev/null || true; }
    at_exit_function _gnupg_exit
    mkdir -p -m 0700 "$GNUPGHOME"
    gpg --no-tty --import <$NOTMUCH_SRCDIR/test/gnupg-secret-key.asc >"$GNUPGHOME"/import.log 2>&1
    test_debug "cat $GNUPGHOME/import.log"
    if (gpg --quick-random --version >/dev/null 2>&1) ; then
        echo quick-random >> "$GNUPGHOME"/gpg.conf
    elif (gpg --debug-quick-random --version >/dev/null 2>&1) ; then
        echo debug-quick-random >> "$GNUPGHOME"/gpg.conf
    fi
    echo no-emit-version >> "$GNUPGHOME"/gpg.conf

    # Change this if we ship a new test key
    FINGERPRINT="5AEAB11F5E33DCE875DDB75B6D92612D94E46381"
    SELF_USERID="Notmuch Test Suite <test_suite@notmuchmail.org> (INSECURE!)"
    printf '%s:6:\n' "$FINGERPRINT" | gpg --quiet --batch --no-tty --import-ownertrust
}

add_gpgsm_home ()
{
    test_require_external_prereq openssl

    local fpr
    [ -e "$GNUPGHOME/gpgsm.conf" ] && return
    _gnupg_exit () { gpgconf --kill all 2>/dev/null || true; }
    at_exit_function _gnupg_exit
    mkdir -p -m 0700 "$GNUPGHOME"
    openssl pkcs12 -export -passout pass: -inkey "$NOTMUCH_SRCDIR/test/smime/key+cert.pem" \
        < "$NOTMUCH_SRCDIR/test/smime/test.crt" | \
        gpgsm --batch --no-tty --no-common-certs-import --pinentry-mode=loopback --passphrase-fd 3 \
              --disable-dirmngr --import  >"$GNUPGHOME"/import.log 2>&1 3<<<''
    fpr=$(gpgsm --batch --list-key test_suite@notmuchmail.org | sed -n 's/.*fingerprint: //p')
    echo "$fpr S relax" >> "$GNUPGHOME/trustlist.txt"
    gpgsm --quiet --batch --no-tty --no-common-certs-import --disable-dirmngr --import < $NOTMUCH_SRCDIR/test/smime/ca.crt
    echo "4D:E0:FF:63:C0:E9:EC:01:29:11:C8:7A:EE:DA:3A:9A:7F:6E:C1:0D S" >> "$GNUPGHOME/trustlist.txt"
    printf '%s::1\n' include-certs disable-crl-checks | gpgconf --output /dev/null --change-options gpgsm
    gpgsm --batch --no-tty --no-common-certs-import --pinentry-mode=loopback --passphrase-fd 3 \
              --disable-dirmngr --import "$NOTMUCH_SRCDIR/test/smime/bob.p12" >>"$GNUPGHOME"/import.log 2>&1 3<<<''
    test_debug "cat $GNUPGHOME/import.log"
}

# Each test should start with something like this, after copyright notices:
#
# test_description='Description of this test...
# This test checks if command xyzzy does the right thing...
# '
# . ./test-lib.sh || exit 1

color=maybe

while test "$#" -ne 0
do
        case "$1" in
        -d|--debug)
                debug=t; shift ;;
        -i|--immediate)
                immediate=t; shift ;;
        -h|--help)
                help=t; shift ;;
        -v|--verbose)
                verbose=t; shift ;;
        -q|--quiet)
                quiet=t; shift ;;
        --with-dashes)
                with_dashes=t; shift ;;
        --no-color)
                color=; shift ;;
        --no-python)
                # noop now...
                shift ;;
        --valgrind)
                valgrind=t; verbose=t; shift ;;
        --tee)
                shift ;; # was handled already
        *)
                echo "error: unknown test option '$1'" >&2; exit 1 ;;
        esac
done

if test -n "$debug"; then
    print_subtest () {
        printf " %-4s" "[$((test_count - 1))]"
    }
else
    print_subtest () {
        true
    }
fi

test -n "$COLORS_WITHOUT_TTY" || [ -t 1 ] || color=

if [ -n "$color" ] && [ "$ORIGINAL_TERM" != 'dumb' ] && (
                TERM=$ORIGINAL_TERM &&
                export TERM &&
                tput bold
                tput setaf
                tput sgr0
        ) >/dev/null 2>&1
then
        color=t
else
        color=
fi

if test -n "$color"; then
        say_color () {
                (
                TERM=$ORIGINAL_TERM
                export TERM
                case "$1" in
                        error) tput bold; tput setaf 1;; # bold red
                        skip)  tput bold; tput setaf 2;; # bold green
                        pass)  tput setaf 2;;            # green
                        info)  tput setaf 3;;            # brown
                        *) test -n "$quiet" && return;;
                esac
                shift
                printf " "
                printf "$@"
                tput sgr0
                print_subtest
                )
        }
else
        say_color() {
                test -z "$1" && test -n "$quiet" && return
                shift
                printf " "
                printf "$@"
                print_subtest
        }
fi

error () {
        say_color error "error: $*\n"
        GIT_EXIT_OK=t
        exit 1
}

say () {
        say_color info "$*"
}

test "${test_description}" != "" ||
error "Test script did not set test_description."

if test "$help" = "t"
then
        echo "Tests ${test_description}"
        exit 0
fi

test_description_printed=
print_test_description ()
{
        test -z "$test_description_printed" || return 0
        echo
        echo $this_test: "Testing ${test_description}"
        test_description_printed=1
}
if [ -z "$NOTMUCH_TEST_QUIET" ]
then
        print_test_description
fi

test_failure=0
test_count=0
test_fixed=0
test_broken=0
test_success=0

declare -a _exit_functions=()

at_exit_function () {
        _exit_functions=($1 ${_exit_functions[@]/$1})
}

rm_exit_function () {
        _exit_functions=(${_exit_functions[@]/$1})
}

_exit_common () {
        code=$?
        trap - EXIT
        set +ex
        for _fn in ${_exit_functions[@]}; do $_fn; done
        rm -rf "$TEST_TMPDIR"
}

trap_exit () {
        _exit_common
        if test -n "$GIT_EXIT_OK"
        then
                exit $code
        else
                exec >&6
                say_color error '%-6s' FATAL
                echo " $test_subtest_name"
                echo
                echo "Unexpected exit while executing $0. Exit code $code."
                exit 1
        fi
}

trap_signal () {
        _exit_common
        echo >&6 "FATAL: $0: interrupted by signal" $((code - 128))
        exit $code
}

die () {
        _exit_common
        exec >&6
        say_color error '%-6s' FATAL
        echo " $*"
        echo
        echo "Unexpected exit while executing $0."
        exit 1
}

GIT_EXIT_OK=
# Note: TEST_TMPDIR *NOT* exported!
TEST_TMPDIR=$(mktemp -d "${TMPDIR:-/tmp}/notmuch-test-$$.XXXXXX")
# Put GNUPGHOME in TMPDIR to avoid problems with long paths.
export GNUPGHOME="${TEST_TMPDIR}/gnupg"
trap 'trap_exit' EXIT
trap 'trap_signal' HUP INT TERM

# Deliver a message with emacs and add it to the database
#
# Uses emacs to generate and deliver a message to the mail store.
# Accepts arbitrary extra emacs/elisp functions to modify the message
# before sending, which is useful to doing things like attaching files
# to the message and encrypting/signing.
emacs_deliver_message ()
{
    local subject body smtp_dummy_pid smtp_dummy_port
    subject="$1"
    body="$2"
    shift 2
    # before we can send a message, we have to prepare the FCC maildir
    mkdir -p "$MAIL_DIR"/sent/{cur,new,tmp}
    # eval'ing smtp-dummy --background will set smtp_dummy_pid and -_port
    smtp_dummy_pid= smtp_dummy_port=
    eval `$TEST_DIRECTORY/smtp-dummy --background sent_message`
    test -n "$smtp_dummy_pid" || return 1
    test -n "$smtp_dummy_port" || return 1

    test_emacs \
        "(let ((message-send-mail-function 'message-smtpmail-send-it)
               (mail-host-address \"example.com\")
               (smtpmail-smtp-server \"localhost\")
               (smtpmail-smtp-service \"${smtp_dummy_port}\"))
           (notmuch-mua-mail)
           (message-goto-to)
           (insert \"test_suite@notmuchmail.org\nDate: 01 Jan 2000 12:00:00 -0000\")
           (message-goto-subject)
           (insert \"${subject}\")
           (message-goto-body)
           (insert \"${body}\")
           $*
           (notmuch-mua-send-and-exit))"

    # In case message was sent properly, client waits for confirmation
    # before exiting and resuming control here; therefore making sure
    # that server exits by sending (KILL) signal to it is safe.
    kill -9 $smtp_dummy_pid
    notmuch new >/dev/null
}

# Pretend to deliver a message with emacs. Really save it to a file
# and add it to the database
#
# Uses emacs to generate and deliver a message to the mail store.
# Accepts arbitrary extra emacs/elisp functions to modify the message
# before sending, which is useful to doing things like attaching files
# to the message and encrypting/signing.
#
# If any GNU-style long-arguments (like --quiet or --decrypt=true) are
# at the head of the argument list, they are sent directly to "notmuch
# new" after message delivery
emacs_fcc_message ()
{
    local nmn_args subject body
    nmn_args=''
    while [[ "$1" =~ ^-- ]]; do
        nmn_args="$nmn_args $1"
        shift
    done
    subject="$1"
    body="$2"
    shift 2
    # before we can send a message, we have to prepare the FCC maildir
    mkdir -p "$MAIL_DIR"/sent/{cur,new,tmp}

    test_emacs \
        "(let ((message-send-mail-function (lambda () t))
               (mail-host-address \"example.com\"))
           (notmuch-mua-mail)
           (message-goto-to)
           (insert \"test_suite@notmuchmail.org\nDate: 01 Jan 2000 12:00:00 -0000\")
           (message-goto-subject)
           (insert \"${subject}\")
           (message-goto-body)
           (insert \"${body}\")
           $*
           (let ((mml-secure-smime-sign-with-sender t)
                 (mml-secure-openpgp-sign-with-sender t))
             (notmuch-mua-send-and-exit)))" || return 1
    notmuch new $nmn_args >/dev/null
}

# Add an existing, fixed corpus of email to the database.
#
# $1 is the corpus dir under corpora to add, using "default" if unset.
#
# The default corpus is based on about 50 messages from early in the
# history of the notmuch mailing list, which allows for reliably
# testing commands that need to operate on a not-totally-trivial
# number of messages.
add_email_corpus ()
{
    local corpus
    corpus=${1:-default}

    rm -rf ${MAIL_DIR}
    cp -a $NOTMUCH_SRCDIR/test/corpora/$corpus ${MAIL_DIR}
    notmuch new >/dev/null || die "'notmuch new' failed while adding email corpus"
}

test_begin_subtest ()
{
    if [ -n "$inside_subtest" ]; then
        exec 1>&6 2>&7          # Restore stdout and stderr
        error "bug in test script: Missing test_expect_equal in ${BASH_SOURCE[1]}:${BASH_LINENO[0]}"
    fi
    test_subtest_name="$1"
    test_reset_state_
    # Redirect test output to the previously prepared file descriptors
    # 3 and 4 (see below)
    if test "$verbose" != "t"; then exec 4>test.output 3>&4; fi
    exec >&3 2>&4
    inside_subtest=t
}

# Pass test if two arguments match
#
# Note: Unlike all other test_expect_* functions, this function does
# not accept a test name. Instead, the caller should call
# test_begin_subtest before calling this function in order to set the
# name.
test_expect_equal ()
{
        local output expected testname
        exec 1>&6 2>&7          # Restore stdout and stderr
        if [ -z "$inside_subtest" ]; then
                error "bug in the test script: test_expect_equal without test_begin_subtest"
        fi
        inside_subtest=
        test "$#" = 2 ||
        error "bug in the test script: not 2 parameters to test_expect_equal"

        output="$1"
        expected="$2"
        if ! test_skip "$test_subtest_name"
        then
                if [ "$output" = "$expected" ]; then
                        test_ok_
                else
                        testname=$this_test.$test_count
                        echo "$expected" > $testname.expected
                        echo "$output" > $testname.output
                        test_failure_ "$(diff -u $testname.expected $testname.output)"
                fi
    fi
}

# Like test_expect_equal, but takes two filenames.
test_expect_equal_file ()
{
        local file1 file2 testname basename1 basename2
        exec 1>&6 2>&7          # Restore stdout and stderr
        if [ -z "$inside_subtest" ]; then
                error "bug in the test script: test_expect_equal_file without test_begin_subtest"
        fi
        inside_subtest=
        test "$#" = 2 ||
        error "bug in the test script: not 2 parameters to test_expect_equal_file"

        file1="$1"
        file2="$2"
        if ! test_skip "$test_subtest_name"
        then
                if diff -q "$file1" "$file2" >/dev/null ; then
                        test_ok_
                else
                        testname=$this_test.$test_count
                        basename1=`basename "$file1"`
                        basename2=`basename "$file2"`
                        cp "$file1" "$testname.$basename1"
                        cp "$file2" "$testname.$basename2"
                        test_failure_ "$(diff -u "$testname.$basename1" "$testname.$basename2")"
                fi
    fi
}

# Like test_expect_equal, but arguments are JSON expressions to be
# canonicalized before diff'ing.  If an argument cannot be parsed, it
# is used unchanged so that there's something to diff against.
test_expect_equal_json () {
    local script output expected
    # The test suite forces LC_ALL=C, but this causes Python 3 to
    # decode stdin as ASCII.  We need to read JSON in UTF-8, so
    # override Python's stdio encoding defaults.
    script='import json, sys; json.dump(json.load(sys.stdin), sys.stdout, sort_keys=True, indent=4)'
    output=$(echo "$1" | PYTHONIOENCODING=utf-8 $NOTMUCH_PYTHON -c "$script" \
        || echo "$1")
    expected=$(echo "$2" | PYTHONIOENCODING=utf-8 $NOTMUCH_PYTHON -c "$script" \
        || echo "$2")
    shift 2
    test_expect_equal "$output" "$expected" "$@"
}

# Ensure that the argument is valid JSON data.
test_valid_json () {
    PYTHONIOENCODING=utf-8 $NOTMUCH_PYTHON -c "import sys, json; json.load(sys.stdin)" <<<"$1"
    test_expect_equal "$?" 0
}

# Sort the top-level list of JSON data from stdin.
test_sort_json () {
    PYTHONIOENCODING=utf-8 $NOTMUCH_PYTHON -c \
        "import sys, json; json.dump(sorted(json.load(sys.stdin)),sys.stdout)"
}

# test for json objects:
# read the source of test/json_check_nodes.py (or the output when
# invoking it without arguments) for an explanation of the syntax.
test_json_nodes () {
        local output
        exec 1>&6 2>&7          # Restore stdout and stderr
        if [ -z "$inside_subtest" ]; then
                error "bug in the test script: test_json_eval without test_begin_subtest"
        fi
        inside_subtest=
        test "$#" > 0 ||
            error "bug in the test script: test_json_nodes needs at least 1 parameter"

        if ! test_skip "$test_subtest_name"
        then
            output=$(PYTHONIOENCODING=utf-8 $NOTMUCH_PYTHON -B "$NOTMUCH_SRCDIR"/test/json_check_nodes.py "$@")
                if [ "$?" = 0 ]
                then
                        test_ok_
                else
                        test_failure_ "$output"
                fi
        fi
}

test_emacs_expect_t () {
        local result
        test "$#" = 1 ||
        error "bug in the test script: not 1 parameter to test_emacs_expect_t"
        if [ -z "$inside_subtest" ]; then
                error "bug in the test script: test_emacs_expect_t without test_begin_subtest"
        fi

        # Run the test.
        if ! test_skip "$test_subtest_name"
        then
                test_emacs "(notmuch-test-run $1)" >/dev/null

                # Restore state after the test.
                exec 1>&6 2>&7          # Restore stdout and stderr
                inside_subtest=

                # Report success/failure.
                result=$(cat OUTPUT)
                if [ "$result" = t ]
                then
                        test_ok_
                else
                        test_failure_ "${result}"
                fi
        else
                # Restore state after the (non) test.
                exec 1>&6 2>&7          # Restore stdout and stderr
                inside_subtest=
        fi
}

NOTMUCH_NEW ()
{
    notmuch new "${@}" | grep -v -E -e '^Processed [0-9]*( total)? file|Found [0-9]* total file'
}

NOTMUCH_DUMP_TAGS ()
{
    # this relies on the default format being batch-tag, otherwise some tests will break
    notmuch dump --include=tags "${@}" | sed '/^#/d' | sort
}

notmuch_drop_mail_headers ()
{
    $NOTMUCH_PYTHON -c '
import email, sys
msg = email.message_from_file(sys.stdin)
for hdr in sys.argv[1:]: del msg[hdr]
print(msg.as_string(False))
' "$@"
}

notmuch_exception_sanitize ()
{
    perl -pe 's/(A Xapian exception occurred at .*[.]cc?):([0-9]*)/\1:XXX/'
}

notmuch_search_sanitize ()
{
    perl -pe 's/("?thread"?: ?)("?)................("?)/\1\2XXX\3/'
}

notmuch_search_files_sanitize ()
{
    notmuch_dir_sanitize
}

notmuch_dir_sanitize ()
{
    sed -e "s,$MAIL_DIR,MAIL_DIR," -e "s,${PWD},CWD,g" "$@"
}

NOTMUCH_SHOW_FILENAME_SQUELCH='s,filename:.*/mail,filename:/XXX/mail,'
notmuch_show_sanitize ()
{
    sed -e "$NOTMUCH_SHOW_FILENAME_SQUELCH"
}
notmuch_show_sanitize_all ()
{
    sed \
        -e 's| filename:.*| filename:XXXXX|' \
        -e 's| id:[^ ]* | id:XXXXX |' | \
        notmuch_date_sanitize
}

notmuch_json_show_sanitize ()
{
    sed \
        -e 's|"id": "[^"]*",|"id": "XXXXX",|g' \
        -e 's|"Date": "Fri, 05 Jan 2001 [^"]*0000"|"Date": "GENERATED_DATE"|g' \
        -e 's|"filename": "signature.asc",||g' \
        -e 's|"filename": \["/[^"]*"\],|"filename": \["YYYYY"\],|g' \
        -e 's|"timestamp": 97.......|"timestamp": 42|g' \
        -e 's|"content-length": [1-9][0-9]*|"content-length": "NONZERO"|g'
}

notmuch_emacs_error_sanitize ()
{
    local command
    command=$1
    shift
    for file in "$@"; do
        echo "=== $file ==="
        cat "$file"
    done | sed \
        -e 's/^\[.*\]$/[XXX]/' \
        -e "s|^\(command: \)\{0,1\}/.*/$command|\1YYY/$command|"
}

notmuch_date_sanitize ()
{
    sed \
        -e 's/^Date: Fri, 05 Jan 2001 .*0000/Date: GENERATED_DATE/'
}

notmuch_uuid_sanitize ()
{
    sed 's/[0-9a-f]\{8\}-[0-9a-f]\{4\}-[0-9a-f]\{4\}-[0-9a-f]\{4\}-[0-9a-f]\{12\}/UUID/g'
}

notmuch_built_with_sanitize ()
{
    sed 's/^built_with[.]\(.*\)=.*$/built_with.\1=something/'
}

notmuch_passwd_sanitize()
{
    ${NOTMUCH_PYTHON} -c'
import os, sys, pwd, socket

pw = pwd.getpwuid(os.getuid())
user = pw.pw_name
name = pw.pw_gecos.partition(",")[0]
fqdn = socket.getfqdn()

for l in sys.stdin:
    l = l.replace(user, "USERNAME").replace(fqdn, "FQDN").replace(".(none)","").replace(name, "USER_FULL_NAME")
    sys.stdout.write(l)
'
}

notmuch_config_sanitize ()
{
    notmuch_dir_sanitize | notmuch_built_with_sanitize
}

notmuch_show_part ()
{
    awk '/^\014part}/{ f=0 }; { if (f) { print $0 } } /^\014part{ ID: '"$1"'/{ f=1 }'
}

# End of notmuch helper functions

# Use test_set_prereq to tell that a particular prerequisite is available.
#
# The prerequisite can later be checked for by using test_have_prereq.
#
# The single parameter is the prerequisite tag (a simple word, in all
# capital letters by convention).

test_set_prereq () {
        satisfied="$satisfied$1 "
}
satisfied=" "

test_have_prereq () {
        case $satisfied in
        *" $1 "*)
                : yes, have it ;;
        *)
                ! : nope ;;
        esac
}

declare -A test_missing_external_prereq_
declare -A test_subtest_missing_external_prereq_

# declare prerequisite for the given external binary
test_declare_external_prereq () {
        local binary
        binary="$1"
        test "$#" = 2 && name=$2 || name="$binary(1)"

        if ! hash $binary 2>/dev/null; then
                test_missing_external_prereq_["${binary}"]=t
                eval "
$binary () {
        test_subtest_missing_external_prereq_[\"${name}\"]=t
        false
}"
        fi
}

# Explicitly require external prerequisite.  Useful when binary is
# called indirectly (e.g. from emacs).
# Returns success if dependency is available, failure otherwise.
test_require_external_prereq () {
        local binary
        binary="$1"
        if [[ ${test_missing_external_prereq_["${binary}"]} == t ]]; then
                # dependency is missing, call the replacement function to note it
                eval "$binary"
        else
                true
        fi
}

# You are not expected to call test_ok_ and test_failure_ directly, use
# the text_expect_* functions instead.

test_ok_ () {
        if test "$test_subtest_known_broken_" = "t"; then
                test_known_broken_ok_
                return
        fi
        test_success=$(($test_success + 1))
        if test -n "$NOTMUCH_TEST_QUIET"; then
                return 0
        fi
        say_color pass "%-6s" "PASS"
        echo " $test_subtest_name"
}

test_failure_ () {
        print_test_description
        if test "$test_subtest_known_broken_" = "t"; then
                test_known_broken_failure_ "$@"
                return
        fi
        test_failure=$(($test_failure + 1))
        test_failure_message_ "FAIL" "$test_subtest_name" "$@"
        test "$immediate" = "" || { GIT_EXIT_OK=t; exit 1; }
        return 1
}

test_failure_message_ () {
        say_color error "%-6s" "$1"
        echo " $2"
        shift 2
        if [ "$#" != "0" ]; then
                echo "$@" | sed -e 's/^/        /'
        fi
        if test "$verbose" != "t"; then cat test.output; fi
}

test_known_broken_ok_ () {
        test_reset_state_
        test_fixed=$(($test_fixed+1))
        say_color pass "%-6s" "FIXED"
        echo " $test_subtest_name"
}

test_known_broken_failure_ () {
        test_reset_state_
        test_broken=$(($test_broken+1))
        if [ -z "$NOTMUCH_TEST_QUIET" ]; then
                test_failure_message_ "BROKEN" "$test_subtest_name" "$@"
        else
                test_failure_message_ "BROKEN" "$test_subtest_name"
        fi
        return 1
}

test_debug () {
        test "$debug" = "" || eval "$1"
}

test_run_ () {
        test_cleanup=:
        if test "$verbose" != "t"; then exec 4>test.output 3>&4; fi
        eval >&3 2>&4 "$1"
        eval_ret=$?
        eval >&3 2>&4 "$test_cleanup"
        return 0
}

test_skip () {
        test_count=$(($test_count+1))
        to_skip=
        for skp in $NOTMUCH_SKIP_TESTS
        do
                case $this_test.$test_count in
                $skp)
                        to_skip=t
                        break
                esac
                case $this_test_bare.$test_count in
                $skp)
                        to_skip=t
                        break
                esac
        done
        case "$to_skip" in
        t)
                test_report_skip_ "$@"
                ;;
        *)
                test_check_missing_external_prereqs_ "$@"
                ;;
        esac
}

test_check_missing_external_prereqs_ () {
        if [[ ${#test_subtest_missing_external_prereq_[@]} != 0 ]]; then
                say_color skip >&1 "missing prerequisites: "
                echo ${!test_subtest_missing_external_prereq_[@]} >&1
                test_report_skip_ "$@"
        else
                false
        fi
}

test_report_skip_ () {
        test_reset_state_
        say_color skip >&3 "skipping test:"
        echo " $@" >&3
        say_color skip "%-6s" "SKIP"
        echo " $1"
}

test_subtest_known_broken () {
        test_subtest_known_broken_=t
}

test_expect_success () {
        exec 1>&6 2>&7          # Restore stdout and stderr
        if [ -z "$inside_subtest" ]; then
                error "bug in the test script: test_expect_success without test_begin_subtest"
        fi
        inside_subtest=
        test "$#" = 1 ||
        error "bug in the test script: not 1 parameters to test_expect_success"

        if ! test_skip "$test_subtest_name"
        then
                test_run_ "$1"
                run_ret="$?"
                # test_run_ may update missing external prerequisites
                test_check_missing_external_prereqs_ "$@" ||
                if [ "$run_ret" = 0 -a "$eval_ret" = 0 ]
                then
                        test_ok_
                else
                        test_failure_ "$1"
                fi
        fi
}

test_expect_code () {
        exec 1>&6 2>&7          # Restore stdout and stderr
        if [ -z "$inside_subtest" ]; then
                error "bug in the test script: test_expect_code without test_begin_subtest"
        fi
        inside_subtest=
        test "$#" = 2 ||
        error "bug in the test script: not 2 parameters to test_expect_code"

        if ! test_skip "$test_subtest_name"
        then
                test_run_ "$2"
                run_ret="$?"
                # test_run_ may update missing external prerequisites,
                test_check_missing_external_prereqs_ "$@" ||
                if [ "$run_ret" = 0 -a "$eval_ret" = "$1" ]
                then
                        test_ok_
                else
                        test_failure_ "exit code $eval_ret, expected $1" "$2"
                fi
        fi
}

# This is not among top-level (test_expect_success)
# but is a prefix that can be used in the test script, like:
#
#       test_expect_success 'complain and die' '
#           do something &&
#           do something else &&
#           test_must_fail git checkout ../outerspace
#       '
#
# Writing this as "! git checkout ../outerspace" is wrong, because
# the failure could be due to a segv.  We want a controlled failure.

test_must_fail () {
        "$@"
        test $? -gt 0 -a $? -le 129 -o $? -gt 192
}

# test_cmp is a helper function to compare actual and expected output.
# You can use it like:
#
#       test_expect_success 'foo works' '
#               echo expected >expected &&
#               foo >actual &&
#               test_cmp expected actual
#       '
#
# This could be written as either "cmp" or "diff -u", but:
# - cmp's output is not nearly as easy to read as diff -u
# - not all diff versions understand "-u"

test_cmp() {
        $GIT_TEST_CMP "$@"
}

# This function can be used to schedule some commands to be run
# unconditionally at the end of the test to restore sanity:
#
#       test_expect_success 'test core.capslock' '
#               git config core.capslock true &&
#               test_when_finished "git config --unset core.capslock" &&
#               hello world
#       '
#
# That would be roughly equivalent to
#
#       test_expect_success 'test core.capslock' '
#               git config core.capslock true &&
#               hello world
#               git config --unset core.capslock
#       '
#
# except that the greeting and config --unset must both succeed for
# the test to pass.

test_when_finished () {
        test_cleanup="{ $*
                } && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
}

test_done () {
        GIT_EXIT_OK=t
        test_results_dir="$TEST_DIRECTORY/test-results"
        mkdir -p "$test_results_dir"
        test_results_path="$test_results_dir/$this_test"

        echo "total $test_count" >> $test_results_path
        echo "success $test_success" >> $test_results_path
        echo "fixed $test_fixed" >> $test_results_path
        echo "broken $test_broken" >> $test_results_path
        echo "failed $test_failure" >> $test_results_path
        echo "" >> $test_results_path

        [ -n "$EMACS_SERVER" ] && test_emacs '(kill-emacs)'

        if [ "$test_failure" = "0" ]; then
            if [ "$test_broken" = "0" ]; then
                rm -rf "$remove_tmp"
            fi
            exit 0
        else
            exit 1
        fi
}

emacs_generate_script () {
        # Construct a little test script here for the benefit of the user,
        # (who can easily run "run_emacs" to get the same emacs environment
        # for investigating any failures).
        cat <<EOF >"$TMP_DIRECTORY/run_emacs"
#!/bin/sh
export PATH=$PATH
export NOTMUCH_CONFIG=$NOTMUCH_CONFIG

# Here's what we are using here:
#
# --quick               Use minimal customization. This implies --no-init-file,
#                       --no-site-file and (emacs 24) --no-site-lisp
#
# --directory           Ensure that the local elisp sources are found
#
# --load                Force loading of notmuch.el and test-lib.el

exec ${TEST_EMACS} --quick \
        --directory "$NOTMUCH_BUILDDIR/emacs" --load notmuch.el \
        --directory "$NOTMUCH_SRCDIR/test" --load test-lib.el \
        "\$@"
EOF
        chmod a+x "$TMP_DIRECTORY/run_emacs"
}

test_emacs () {
        # test dependencies beforehand to avoid the waiting loop below
        missing_dependencies=
        test_require_external_prereq dtach || missing_dependencies=1
        test_require_external_prereq emacs || missing_dependencies=1
        test_require_external_prereq ${TEST_EMACSCLIENT} || missing_dependencies=1
        test -z "$missing_dependencies" || return

        if [ -z "$EMACS_SERVER" ]; then
                emacs_tests="$NOTMUCH_SRCDIR/test/${this_test_bare}.el"
                if [ -f "$emacs_tests" ]; then
                        load_emacs_tests="--eval '(load \"$emacs_tests\")'"
                else
                        load_emacs_tests=
                fi
                server_name="notmuch-test-suite-$$"
                # start a detached session with an emacs server
                # user's TERM (or 'vt100' in case user's TERM is known dumb
                # or unknown) is given to dtach which assumes a minimally
                # VT100-compatible terminal -- and emacs inherits that
                TERM=$SMART_TERM dtach -n "$TEST_TMPDIR/emacs-dtach-socket.$$" \
                        sh -c "stty rows 24 cols 80; exec '$TMP_DIRECTORY/run_emacs' \
                                --no-window-system \
                                $load_emacs_tests \
                                --eval '(setq server-name \"$server_name\")' \
                                --eval '(server-start)' \
                                --eval '(orphan-watchdog $$)'" || return
                EMACS_SERVER="$server_name"
                # wait until the emacs server is up
                until test_emacs '()' >/dev/null 2>/dev/null; do
                        sleep 1
                done
        fi

        # Clear test-output output file.  Most Emacs tests end with a
        # call to (test-output).  If the test code fails with an
        # exception before this call, the output file won't get
        # updated.  Since we don't want to compare against an output
        # file from another test, so start out with an empty file.
        rm -f OUTPUT
        touch OUTPUT

        ${TEST_EMACSCLIENT} --socket-name="$EMACS_SERVER" --eval "(notmuch-test-progn $*)"
}

test_python() {
    # Note: if there is need to print debug information from python program,
    # use stdout = os.fdopen(6, 'w') or stderr = os.fdopen(7, 'w')
    PYTHONPATH="$NOTMUCH_SRCDIR/bindings/python${PYTHONPATH:+:$PYTHONPATH}" \
        $NOTMUCH_PYTHON -B - > OUTPUT
}

test_ruby() {
    MAIL_DIR=$MAIL_DIR $NOTMUCH_RUBY -I "$NOTMUCH_BUILDDIR/bindings/ruby"> OUTPUT
}

test_C () {
    local exec_file test_file
    exec_file="test${test_count}"
    test_file="${exec_file}.c"
    cat > ${test_file}
    ${TEST_CC} ${TEST_CFLAGS} -I${NOTMUCH_SRCDIR}/test -I${NOTMUCH_SRCDIR}/lib -o ${exec_file} ${test_file} -L${NOTMUCH_BUILDDIR}/lib/ -lnotmuch -ltalloc
    echo "== stdout ==" > OUTPUT.stdout
    echo "== stderr ==" > OUTPUT.stderr
    ./${exec_file} "$@" 1>>OUTPUT.stdout 2>>OUTPUT.stderr
    notmuch_dir_sanitize OUTPUT.stdout OUTPUT.stderr | notmuch_exception_sanitize > OUTPUT
}

make_shim () {
    local base_name test_file shim_file
    base_name="$1"
    test_file="${base_name}.c"
    shim_file="${base_name}.so"
    cat > ${test_file}
    ${TEST_CC} ${TEST_CFLAGS} ${TEST_SHIM_CFLAGS} -I${NOTMUCH_SRCDIR}/test -I${NOTMUCH_SRCDIR}/lib -o ${shim_file} ${test_file} ${TEST_SHIM_LDFLAGS}
}

notmuch_with_shim () {
    local base_name shim_file
    base_name="$1"
    shift
    shim_file="${base_name}.so"
    LD_PRELOAD=${LD_PRELOAD:+:$LD_PRELOAD}:./${shim_file} notmuch-shared "$@"
}

# Creates a script that counts how much time it is executed and calls
# notmuch.  $notmuch_counter_command is set to the path to the
# generated script.  Use notmuch_counter_value() function to get the
# current counter value.
notmuch_counter_reset () {
        notmuch_counter_command="$TMP_DIRECTORY/notmuch_counter"
        if [ ! -x "$notmuch_counter_command" ]; then
                notmuch_counter_state_path="$TMP_DIRECTORY/notmuch_counter.state"
                cat >"$notmuch_counter_command" <<EOF || return
#!/bin/sh

read count < "$notmuch_counter_state_path"
echo \$((count + 1)) > "$notmuch_counter_state_path"

exec notmuch "\$@"
EOF
                chmod +x "$notmuch_counter_command" || return
        fi

        echo 0 > "$notmuch_counter_state_path"
}

# Returns the current notmuch counter value.
notmuch_counter_value () {
        if [ -r "$notmuch_counter_state_path" ]; then
                read count < "$notmuch_counter_state_path"
        else
                count=0
        fi
        echo $count
}

test_reset_state_ () {
        test -z "$test_init_done_" && test_init_

        test_subtest_known_broken_=
        test_subtest_missing_external_prereq_=()
}

# called once before the first subtest
test_init_ () {
        test_init_done_=t

        # skip all tests if there were external prerequisites missing during init
        test_check_missing_external_prereqs_ "all tests in $this_test" && test_done
}


# Where to run the tests
TEST_DIRECTORY=$NOTMUCH_BUILDDIR/test

. "$NOTMUCH_SRCDIR/test/test-lib-common.sh" || exit 1

emacs_generate_script


# Use -P to resolve symlinks in our working directory so that the cwd
# in subprocesses like git equals our $PWD (for pathname comparisons).
cd -P "$TMP_DIRECTORY" || error "Cannot set up test environment"

if test "$verbose" = "t"
then
        exec 4>&2 3>&1
else
        exec 4>test.output 3>&4
fi

for skp in $NOTMUCH_SKIP_TESTS
do
        to_skip=
        for skp in $NOTMUCH_SKIP_TESTS
        do
                case "$this_test" in
                $skp)
                        to_skip=t
                        break
                esac
                case "$this_test_bare" in
                $skp)
                        to_skip=t
                        break
                esac
        done
        case "$to_skip" in
        t)
                say_color skip >&3 "skipping test $this_test altogether"
                say_color skip "skip all tests in $this_test"
                test_done
        esac
done

# Provide an implementation of the 'yes' utility
yes () {
        if test $# = 0
        then
                y=y
        else
                y="$*"
        fi

        while echo "$y"
        do
                :
        done
}

# Fix some commands on Windows
case $(uname -s) in
*MINGW*)
        # Windows has its own (incompatible) sort and find
        sort () {
                /usr/bin/sort "$@"
        }
        find () {
                /usr/bin/find "$@"
        }
        sum () {
                md5sum "$@"
        }
        # git sees Windows-style pwd
        pwd () {
                builtin pwd -W
        }
        # no POSIX permissions
        # backslashes in pathspec are converted to '/'
        # exec does not inherit the PID
        ;;
*)
        test_set_prereq POSIXPERM
        test_set_prereq BSLASHPSPEC
        test_set_prereq EXECKEEPSPID
        ;;
esac

test -z "$NO_PERL" && test_set_prereq PERL
test -z "$NO_PYTHON" && test_set_prereq PYTHON

# test whether the filesystem supports symbolic links
ln -s x y 2>/dev/null && test -h y 2>/dev/null && test_set_prereq SYMLINKS
rm -f y

# declare prerequisites for external binaries used in tests
test_declare_external_prereq dtach
test_declare_external_prereq emacs
test_declare_external_prereq ${TEST_EMACSCLIENT}
test_declare_external_prereq ${TEST_GDB}
test_declare_external_prereq gpg
test_declare_external_prereq openssl
test_declare_external_prereq gpgsm
test_declare_external_prereq ${NOTMUCH_PYTHON}
test_declare_external_prereq xapian-metadata
test_declare_external_prereq xapian-delve