#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano
#
# 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 http://www.gnu.org/licenses/ .

# 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, $* " in
done,*)
        # do not redirect again
        ;;
*' --tee '*|*' --va'*)
        mkdir -p test-results
        BASE=test-results/$(basename "$0" .sh)
        (GIT_TEST_TEE_STARTED=done ${SHELL-sh} "$0" "$@" 2>&1;
         echo $? > $BASE.exit) | tee $BASE.out
        test "$(cat $BASE.exit)" = 0
        exit
        ;;
esac

# Keep the original TERM for say_color
ORIGINAL_TERM=$TERM

# 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
EDITOR=:
unset VISUAL
unset GIT_EDITOR
unset AUTHOR_DATE
unset AUTHOR_EMAIL
unset AUTHOR_NAME
unset COMMIT_AUTHOR_EMAIL
unset COMMIT_AUTHOR_NAME
unset EMAIL
unset GIT_ALTERNATE_OBJECT_DIRECTORIES
unset GIT_AUTHOR_DATE
GIT_AUTHOR_EMAIL=author@example.com
GIT_AUTHOR_NAME='A U Thor'
unset GIT_COMMITTER_DATE
GIT_COMMITTER_EMAIL=committer@example.com
GIT_COMMITTER_NAME='C O Mitter'
unset GIT_DIFF_OPTS
unset GIT_DIR
unset GIT_WORK_TREE
unset GIT_EXTERNAL_DIFF
unset GIT_INDEX_FILE
unset GIT_OBJECT_DIRECTORY
unset GIT_CEILING_DIRECTORIES
unset SHA1_FILE_DIRECTORIES
unset SHA1_FILE_DIRECTORY
unset GIT_NOTES_REF
unset GIT_NOTES_DISPLAY_REF
unset GIT_NOTES_REWRITE_REF
unset GIT_NOTES_REWRITE_MODE
GIT_MERGE_VERBOSITY=5
export GIT_MERGE_VERBOSITY
export GIT_AUTHOR_EMAIL GIT_AUTHOR_NAME
export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME
export EDITOR

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

unset GREP_OPTIONS

case $(echo $GIT_TRACE |tr "[A-Z]" "[a-z]") in
        1|2|true)
                echo "* warning: Some tests will not work if GIT_TRACE" \
                        "is set as to trace on STDERR ! *"
                echo "* warning: Please set GIT_TRACE to something" \
                        "other than 1, 2 or true ! *"
                ;;
esac

# Convenience
#
# A regexp to match 5 and 40 hexdigits
_x05='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
_x40="$_x05$_x05$_x05$_x05$_x05$_x05$_x05$_x05"

# 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
[ "x$ORIGINAL_TERM" != "xdumb" ] && (
                TERM=$ORIGINAL_TERM &&
                export TERM &&
                [ -t 1 ] &&
                tput bold >/dev/null 2>&1 &&
                tput setaf 1 >/dev/null 2>&1 &&
                tput sgr0 >/dev/null 2>&1
        ) &&
        color=t

while test "$#" -ne 0
do
        case "$1" in
        -d|--d|--de|--deb|--debu|--debug)
                debug=t; shift ;;
        -i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
                immediate=t; shift ;;
        -l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
                GIT_TEST_LONG=t; export GIT_TEST_LONG; shift ;;
        -h|--h|--he|--hel|--help)
                help=t; shift ;;
        -v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
                verbose=t; shift ;;
        -q|--q|--qu|--qui|--quie|--quiet)
                quiet=t; shift ;;
        --with-dashes)
                with_dashes=t; shift ;;
        --no-color)
                color=; shift ;;
        --no-python)
                # noop now...
                shift ;;
        --va|--val|--valg|--valgr|--valgri|--valgrin|--valgrind)
                valgrind=t; verbose=t; shift ;;
        --tee)
                shift ;; # was handled already
        --root=*)
                root=$(expr "z$1" : 'z[^=]*=\(.*\)')
                shift ;;
        *)
                echo "error: unknown test option '$1'" >&2; exit 1 ;;
        esac
done

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 "* %s" "$*"
                tput sgr0
                echo
                )
        }
else
        say_color() {
                test -z "$1" && test -n "$quiet" && return
                shift
                echo "* $*"
        }
fi

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

say () {
        say_color info "$*"
}

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

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

exec 5>&1
if test "$verbose" = "t"
then
        exec 4>&2 3>&1
else
        exec 4>/dev/null 3>/dev/null
fi

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

die () {
        code=$?
        if test -n "$GIT_EXIT_OK"
        then
                exit $code
        else
                echo >&5 "FATAL: Unexpected exit with code $code"
                exit 1
        fi
}

GIT_EXIT_OK=
trap 'die' EXIT

# The semantics of the editor variables are that of invoking
# sh -c "$EDITOR \"$@\"" files ...
#
# If our trash directory contains shell metacharacters, they will be
# interpreted if we just set $EDITOR directly, so do a little dance with
# environment variables to work around this.
#
# In particular, quoting isn't enough, as the path may contain the same quote
# that we're using.
test_set_editor () {
        FAKE_EDITOR="$1"
        export FAKE_EDITOR
        EDITOR='"$FAKE_EDITOR"'
        export EDITOR
}

test_decode_color () {
        sed     -e 's/.\[1m/<WHITE>/g' \
                -e 's/.\[31m/<RED>/g' \
                -e 's/.\[32m/<GREEN>/g' \
                -e 's/.\[33m/<YELLOW>/g' \
                -e 's/.\[34m/<BLUE>/g' \
                -e 's/.\[35m/<MAGENTA>/g' \
                -e 's/.\[36m/<CYAN>/g' \
                -e 's/.\[m/<RESET>/g'
}

q_to_nul () {
        perl -pe 'y/Q/\000/'
}

q_to_cr () {
        tr Q '\015'
}

append_cr () {
        sed -e 's/$/Q/' | tr Q '\015'
}

remove_cr () {
        tr '\015' Q | sed -e 's/Q$//'
}

test_tick () {
        if test -z "${test_tick+set}"
        then
                test_tick=1112911993
        else
                test_tick=$(($test_tick + 60))
        fi
        GIT_COMMITTER_DATE="$test_tick -0700"
        GIT_AUTHOR_DATE="$test_tick -0700"
        export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
}

# Call test_commit with the arguments "<message> [<file> [<contents>]]"
#
# This will commit a file with the given contents and the given commit
# message.  It will also add a tag with <message> as name.
#
# Both <file> and <contents> default to <message>.

test_commit () {
        file=${2:-"$1.t"}
        echo "${3-$1}" > "$file" &&
        git add "$file" &&
        test_tick &&
        git commit -m "$1" &&
        git tag "$1"
}

# Call test_merge with the arguments "<message> <commit>", where <commit>
# can be a tag pointing to the commit-to-merge.

test_merge () {
        test_tick &&
        git merge -m "$1" "$2" &&
        git tag "$1"
}

# This function helps systems where core.filemode=false is set.
# Use it instead of plain 'chmod +x' to set or unset the executable bit
# of a file in the working directory and add it to the index.

test_chmod () {
        chmod "$@" &&
        git update-index --add "--chmod=$@"
}

# Use test_set_prereq to tell that a particular prerequisite is available.
# The prerequisite can later be checked for in two ways:
#
# - Explicitly using test_have_prereq.
#
# - Implicitly by specifying the prerequisite tag in the calls to
#   test_expect_{success,failure,code}.
#
# 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
}

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

test_ok_ () {
        test_success=$(($test_success + 1))
        say_color "" "  ok $test_count: $@"
}

test_failure_ () {
        test_failure=$(($test_failure + 1))
        say_color error "FAIL $test_count: $1"
        shift
        echo "$@" | sed -e 's/^/        /'
        test "$immediate" = "" || { GIT_EXIT_OK=t; exit 1; }
}

test_known_broken_ok_ () {
        test_fixed=$(($test_fixed+1))
        say_color "" "  FIXED $test_count: $@"
}

test_known_broken_failure_ () {
        test_broken=$(($test_broken+1))
        say_color skip "  still broken $test_count: $@"
}

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

test_run_ () {
        test_cleanup=:
        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 $GIT_SKIP_TESTS
        do
                case $this_test.$test_count in
                $skp)
                        to_skip=t
                esac
        done
        if test -z "$to_skip" && test -n "$prereq" &&
           ! test_have_prereq "$prereq"
        then
                to_skip=t
        fi
        case "$to_skip" in
        t)
                say_color skip >&3 "skipping test: $@"
                say_color skip "skip $test_count: $1"
                : true
                ;;
        *)
                false
                ;;
        esac
}

test_expect_failure () {
        test "$#" = 3 && { prereq=$1; shift; } || prereq=
        test "$#" = 2 ||
        error "bug in the test script: not 2 or 3 parameters to test-expect-failure"
        if ! test_skip "$@"
        then
                say >&3 "checking known breakage: $2"
                test_run_ "$2"
                if [ "$?" = 0 -a "$eval_ret" = 0 ]
                then
                        test_known_broken_ok_ "$1"
                else
                        test_known_broken_failure_ "$1"
                fi
        fi
        echo >&3 ""
}

test_expect_success () {
        test "$#" = 3 && { prereq=$1; shift; } || prereq=
        test "$#" = 2 ||
        error "bug in the test script: not 2 or 3 parameters to test-expect-success"
        if ! test_skip "$@"
        then
                say >&3 "expecting success: $2"
                test_run_ "$2"
                if [ "$?" = 0 -a "$eval_ret" = 0 ]
                then
                        test_ok_ "$1"
                else
                        test_failure_ "$@"
                fi
        fi
        echo >&3 ""
}

test_expect_code () {
        test "$#" = 4 && { prereq=$1; shift; } || prereq=
        test "$#" = 3 ||
        error "bug in the test script: not 3 or 4 parameters to test-expect-code"
        if ! test_skip "$@"
        then
                say >&3 "expecting exit code $1: $3"
                test_run_ "$3"
                if [ "$?" = 0 -a "$eval_ret" = "$1" ]
                then
                        test_ok_ "$2"
                else
                        test_failure_ "$@"
                fi
        fi
        echo >&3 ""
}

# test_external runs external test scripts that provide continuous
# test output about their progress, and succeeds/fails on
# zero/non-zero exit code.  It outputs the test output on stdout even
# in non-verbose mode, and announces the external script with "* run
# <n>: ..." before running it.  When providing relative paths, keep in
# mind that all scripts run in "trash directory".
# Usage: test_external description command arguments...
# Example: test_external 'Perl API' perl ../path/to/test.pl
test_external () {
        test "$#" = 4 && { prereq=$1; shift; } || prereq=
        test "$#" = 3 ||
        error >&5 "bug in the test script: not 3 or 4 parameters to test_external"
        descr="$1"
        shift
        if ! test_skip "$descr" "$@"
        then
                # Announce the script to reduce confusion about the
                # test output that follows.
                say_color "" " run $test_count: $descr ($*)"
                # Export TEST_DIRECTORY, TRASH_DIRECTORY and GIT_TEST_LONG
                # to be able to use them in script
                export TEST_DIRECTORY TRASH_DIRECTORY GIT_TEST_LONG
                # Run command; redirect its stderr to &4 as in
                # test_run_, but keep its stdout on our stdout even in
                # non-verbose mode.
                "$@" 2>&4
                if [ "$?" = 0 ]
                then
                        test_ok_ "$descr"
                else
                        test_failure_ "$descr" "$@"
                fi
        fi
}

# Like test_external, but in addition tests that the command generated
# no output on stderr.
test_external_without_stderr () {
        # The temporary file has no (and must have no) security
        # implications.
        tmp="$TMPDIR"; if [ -z "$tmp" ]; then tmp=/tmp; fi
        stderr="$tmp/git-external-stderr.$$.tmp"
        test_external "$@" 4> "$stderr"
        [ -f "$stderr" ] || error "Internal error: $stderr disappeared."
        descr="no stderr: $1"
        shift
        say >&3 "expecting no stderr from previous command"
        if [ ! -s "$stderr" ]; then
                rm "$stderr"
                test_ok_ "$descr"
        else
                if [ "$verbose" = t ]; then
                        output=`echo; echo Stderr is:; cat "$stderr"`
                else
                        output=
                fi
                # rm first in case test_failure exits.
                rm "$stderr"
                test_failure_ "$descr" "$@" "$output"
        fi
}

# This is not among top-level (test_expect_success | test_expect_failure)
# 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
}

# Similar to test_must_fail, but tolerates success, too.  This is
# meant to be used in contexts like:
#
#       test_expect_success 'some command works without configuration' '
#               test_might_fail git config --unset all.configuration &&
#               do something
#       '
#
# Writing "git config --unset all.configuration || :" would be wrong,
# because we want to notice if it fails due to segv.

test_might_fail () {
        "$@"
        test $? -ge 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"
}

# Most tests can use the created repository, but some may need to create more.
# Usage: test_create_repo <directory>
test_create_repo () {
        test "$#" = 1 ||
        error "bug in the test script: not 1 parameter to test-create-repo"
        owd=`pwd`
        repo="$1"
        mkdir -p "$repo"
        cd "$repo" || error "Cannot setup test environment"
        "$GIT_EXEC_PATH/git-init" "--template=$TEST_DIRECTORY/../templates/blt/" >&3 2>&4 ||
        error "cannot run git init -- have you built things yet?"
        mv .git/hooks .git/hooks-disabled
        cd "$owd"
}

test_done () {
        GIT_EXIT_OK=t
        test_results_dir="$TEST_DIRECTORY/test-results"
        mkdir -p "$test_results_dir"
        test_results_path="$test_results_dir/${0%.sh}-$$"

        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

        if test "$test_fixed" != 0
        then
                say_color pass "fixed $test_fixed known breakage(s)"
        fi
        if test "$test_broken" != 0
        then
                say_color error "still have $test_broken known breakage(s)"
                msg="remaining $(($test_count-$test_broken)) test(s)"
        else
                msg="$test_count test(s)"
        fi
        case "$test_failure" in
        0)
                say_color pass "passed all $msg"

                test -d "$remove_trash" &&
                cd "$(dirname "$remove_trash")" &&
                rm -rf "$(basename "$remove_trash")"

                exit 0 ;;

        *)
                say_color error "failed $test_failure among $msg"
                exit 1 ;;

        esac
}

# Test the binaries we have just built.  The tests are kept in
# t/ subdirectory and are run in 'trash directory' subdirectory.
TEST_DIRECTORY=$(pwd)
if test -n "$valgrind"
then
        make_symlink () {
                test -h "$2" &&
                test "$1" = "$(readlink "$2")" || {
                        # be super paranoid
                        if mkdir "$2".lock
                        then
                                rm -f "$2" &&
                                ln -s "$1" "$2" &&
                                rm -r "$2".lock
                        else
                                while test -d "$2".lock
                                do
                                        say "Waiting for lock on $2."
                                        sleep 1
                                done
                        fi
                }
        }

        make_valgrind_symlink () {
                # handle only executables
                test -x "$1" || return

                base=$(basename "$1")
                symlink_target=$TEST_DIRECTORY/../$base
                # do not override scripts
                if test -x "$symlink_target" &&
                    test ! -d "$symlink_target" &&
                    test "#!" != "$(head -c 2 < "$symlink_target")"
                then
                        symlink_target=../valgrind.sh
                fi
                case "$base" in
                *.sh|*.perl)
                        symlink_target=../unprocessed-script
                esac
                # create the link, or replace it if it is out of date
                make_symlink "$symlink_target" "$GIT_VALGRIND/bin/$base" || exit
        }

        # override all git executables in TEST_DIRECTORY/..
        GIT_VALGRIND=$TEST_DIRECTORY/valgrind
        mkdir -p "$GIT_VALGRIND"/bin
        for file in $TEST_DIRECTORY/../git* $TEST_DIRECTORY/../test-*
        do
                make_valgrind_symlink $file
        done
        OLDIFS=$IFS
        IFS=:
        for path in $PATH
        do
                ls "$path"/git-* 2> /dev/null |
                while read file
                do
                        make_valgrind_symlink "$file"
                done
        done
        IFS=$OLDIFS
        PATH=$GIT_VALGRIND/bin:$PATH
        GIT_EXEC_PATH=$GIT_VALGRIND/bin
        export GIT_VALGRIND
elif test -n "$GIT_TEST_INSTALLED" ; then
        GIT_EXEC_PATH=$($GIT_TEST_INSTALLED/git --exec-path)  ||
        error "Cannot run git from $GIT_TEST_INSTALLED."
        PATH=$GIT_TEST_INSTALLED:$TEST_DIRECTORY/..:$PATH
        GIT_EXEC_PATH=${GIT_TEST_EXEC_PATH:-$GIT_EXEC_PATH}
else # normal case, use ../bin-wrappers only unless $with_dashes:
        git_bin_dir="$TEST_DIRECTORY/../bin-wrappers"
        if ! test -x "$git_bin_dir/git" ; then
                if test -z "$with_dashes" ; then
                        say "$git_bin_dir/git is not executable; using GIT_EXEC_PATH"
                fi
                with_dashes=t
        fi
        PATH="$git_bin_dir:$PATH"
        GIT_EXEC_PATH=$TEST_DIRECTORY/..
        if test -n "$with_dashes" ; then
                PATH="$TEST_DIRECTORY/..:$PATH"
        fi
fi
GIT_TEMPLATE_DIR=$(pwd)/../templates/blt
unset GIT_CONFIG
GIT_CONFIG_NOSYSTEM=1
GIT_CONFIG_NOGLOBAL=1
export PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR GIT_CONFIG_NOSYSTEM GIT_CONFIG_NOGLOBAL

. ../GIT-BUILD-OPTIONS

if test -z "$GIT_TEST_CMP"
then
        if test -n "$GIT_TEST_CMP_USE_COPIED_CONTEXT"
        then
                GIT_TEST_CMP="$DIFF -c"
        else
                GIT_TEST_CMP="$DIFF -u"
        fi
fi

GITPERLLIB=$(pwd)/../perl/blib/lib:$(pwd)/../perl/blib/arch/auto/Git
export GITPERLLIB
test -d ../templates/blt || {
        error "You haven't built things yet, have you?"
}

if test -z "$GIT_TEST_INSTALLED" && test -z "$NO_PYTHON"
then
        GITPYTHONLIB="$(pwd)/../git_remote_helpers/build/lib"
        export GITPYTHONLIB
        test -d ../git_remote_helpers/build || {
                error "You haven't built git_remote_helpers yet, have you?"
        }
fi

if ! test -x ../test-chmtime; then
        echo >&2 'You need to build test-chmtime:'
        echo >&2 'Run "make test-chmtime" in the source (toplevel) directory'
        exit 1
fi

# Test repository
test="trash directory.$(basename "$0" .sh)"
test -n "$root" && test="$root/$test"
case "$test" in
/*) TRASH_DIRECTORY="$test" ;;
 *) TRASH_DIRECTORY="$TEST_DIRECTORY/$test" ;;
esac
test ! -z "$debug" || remove_trash=$TRASH_DIRECTORY
rm -fr "$test" || {
        GIT_EXIT_OK=t
        echo >&5 "FATAL: Cannot prepare test area"
        exit 1
}

test_create_repo "$test"
# Use -P to resolve symlinks in our working directory so that the cwd
# in subprocesses like git equals our $PWD (for pathname comparisons).
cd -P "$test" || exit 1

this_test=${0##*/}
this_test=${this_test%%-*}
for skp in $GIT_SKIP_TESTS
do
        to_skip=
        for skp in $GIT_SKIP_TESTS
        do
                case "$this_test" in
                $skp)
                        to_skip=t
                esac
        done
        case "$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