The second batch

[git] / t / test-lib-functions.sh

# Library of functions shared by all tests scripts, included by
# test-lib.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/ .

# 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 () {
        awk '
                function name(n) {
                        if (n == 0) return "RESET";
                        if (n == 1) return "BOLD";
                        if (n == 2) return "FAINT";
                        if (n == 3) return "ITALIC";
                        if (n == 7) return "REVERSE";
                        if (n == 30) return "BLACK";
                        if (n == 31) return "RED";
                        if (n == 32) return "GREEN";
                        if (n == 33) return "YELLOW";
                        if (n == 34) return "BLUE";
                        if (n == 35) return "MAGENTA";
                        if (n == 36) return "CYAN";
                        if (n == 37) return "WHITE";
                        if (n == 40) return "BLACK";
                        if (n == 41) return "BRED";
                        if (n == 42) return "BGREEN";
                        if (n == 43) return "BYELLOW";
                        if (n == 44) return "BBLUE";
                        if (n == 45) return "BMAGENTA";
                        if (n == 46) return "BCYAN";
                        if (n == 47) return "BWHITE";
                }
                {
                        while (match($0, /\033\[[0-9;]*m/) != 0) {
                                printf "%s<", substr($0, 1, RSTART-1);
                                codes = substr($0, RSTART+2, RLENGTH-3);
                                if (length(codes) == 0)
                                        printf "%s", name(0)
                                else {
                                        n = split(codes, ary, ";");
                                        sep = "";
                                        for (i = 1; i <= n; i++) {
                                                printf "%s%s", sep, name(ary[i]);
                                                sep = ";"
                                        }
                                }
                                printf ">";
                                $0 = substr($0, RSTART + RLENGTH, length($0) - RSTART - RLENGTH + 1);
                        }
                        print
                }
        '
}

lf_to_nul () {
        perl -pe 'y/\012/\000/'
}

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

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

q_to_cr () {
        tr Q '\015'
}

q_to_tab () {
        tr Q '\011'
}

qz_to_tab_space () {
        tr QZ '\011\040'
}

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

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

# In some bourne shell implementations, the "unset" builtin returns
# nonzero status when a variable to be unset was not set in the first
# place.
#
# Use sane_unset when that should not be considered an error.

sane_unset () {
        unset "$@"
        return 0
}

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
}

# Stop execution and start a shell. This is useful for debugging tests.
#
# Be sure to remove all invocations of this command before submitting.

test_pause () {
        "$SHELL_PATH" <&6 >&5 2>&7
}

# Wrap git with a debugger. Adding this to a command can make it easier
# to understand what is going on in a failing test.
#
# Examples:
#     debug git checkout master
#     debug --debugger=nemiver git $ARGS
#     debug -d "valgrind --tool=memcheck --track-origins=yes" git $ARGS
debug () {
        case "$1" in
        -d)
                GIT_DEBUGGER="$2" &&
                shift 2
                ;;
        --debugger=*)
                GIT_DEBUGGER="${1#*=}" &&
                shift 1
                ;;
        *)
                GIT_DEBUGGER=1
                ;;
        esac &&
        GIT_DEBUGGER="${GIT_DEBUGGER}" "$@" <&6 >&5 2>&7
}

# Usage: test_commit [options] <message> [<file> [<contents> [<tag>]]]
#   -C <dir>:
#       Run all git commands in directory <dir>
#   --notick
#       Do not call test_tick before making a commit
#   --append
#       Use ">>" instead of ">" when writing "<contents>" to "<file>"
#   --printf
#       Use "printf" instead of "echo" when writing "<contents>" to
#       "<file>", use this to write escape sequences such as "\0", a
#       trailing "\n" won't be added automatically. This option
#       supports nothing but the FORMAT of printf(1), i.e. no custom
#       ARGUMENT(s).
#   --signoff
#       Invoke "git commit" with --signoff
#   --author <author>
#       Invoke "git commit" with --author <author>
#   --no-tag
#       Do not tag the resulting commit
#   --annotate
#       Create an annotated tag with "--annotate -m <message>". Calls
#       test_tick between making the commit and tag, unless --notick
#       is given.
#
# This will commit a file with the given contents and the given commit
# message, and tag the resulting commit with the given tag name.
#
# <file>, <contents>, and <tag> all default to <message>.

test_commit () {
        notick= &&
        echo=echo &&
        append= &&
        author= &&
        signoff= &&
        indir= &&
        tag=light &&
        while test $# != 0
        do
                case "$1" in
                --notick)
                        notick=yes
                        ;;
                --printf)
                        echo=printf
                        ;;
                --append)
                        append=yes
                        ;;
                --author)
                        author="$2"
                        shift
                        ;;
                --signoff)
                        signoff="$1"
                        ;;
                --date)
                        notick=yes
                        GIT_COMMITTER_DATE="$2"
                        GIT_AUTHOR_DATE="$2"
                        shift
                        ;;
                -C)
                        indir="$2"
                        shift
                        ;;
                --no-tag)
                        tag=none
                        ;;
                --annotate)
                        tag=annotate
                        ;;
                *)
                        break
                        ;;
                esac
                shift
        done &&
        indir=${indir:+"$indir"/} &&
        file=${2:-"$1.t"} &&
        if test -n "$append"
        then
                $echo "${3-$1}" >>"$indir$file"
        else
                $echo "${3-$1}" >"$indir$file"
        fi &&
        git ${indir:+ -C "$indir"} add "$file" &&
        if test -z "$notick"
        then
                test_tick
        fi &&
        git ${indir:+ -C "$indir"} commit \
            ${author:+ --author "$author"} \
            $signoff -m "$1" &&
        case "$tag" in
        none)
                ;;
        light)
                git ${indir:+ -C "$indir"} tag "${4:-$1}"
                ;;
        annotate)
                if test -z "$notick"
                then
                        test_tick
                fi &&
                git ${indir:+ -C "$indir"} tag -a -m "$1" "${4:-$1}"
                ;;
        esac
}

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

test_merge () {
        label="$1" &&
        shift &&
        test_tick &&
        git merge -m "$label" "$@" &&
        git tag "$label"
}

# Efficiently create <nr> commits, each with a unique number (from 1 to <nr>
# by default) in the commit message.
#
# Usage: test_commit_bulk [options] <nr>
#   -C <dir>:
#       Run all git commands in directory <dir>
#   --ref=<n>:
#       ref on which to create commits (default: HEAD)
#   --start=<n>:
#       number commit messages from <n> (default: 1)
#   --message=<msg>:
#       use <msg> as the commit mesasge (default: "commit %s")
#   --filename=<fn>:
#       modify <fn> in each commit (default: %s.t)
#   --contents=<string>:
#       place <string> in each file (default: "content %s")
#   --id=<string>:
#       shorthand to use <string> and %s in message, filename, and contents
#
# The message, filename, and contents strings are evaluated by printf, with the
# first "%s" replaced by the current commit number. So you can do:
#
#   test_commit_bulk --filename=file --contents="modification %s"
#
# to have every commit touch the same file, but with unique content.
#
test_commit_bulk () {
        tmpfile=.bulk-commit.input
        indir=.
        ref=HEAD
        n=1
        message='commit %s'
        filename='%s.t'
        contents='content %s'
        while test $# -gt 0
        do
                case "$1" in
                -C)
                        indir=$2
                        shift
                        ;;
                --ref=*)
                        ref=${1#--*=}
                        ;;
                --start=*)
                        n=${1#--*=}
                        ;;
                --message=*)
                        message=${1#--*=}
                        ;;
                --filename=*)
                        filename=${1#--*=}
                        ;;
                --contents=*)
                        contents=${1#--*=}
                        ;;
                --id=*)
                        message="${1#--*=} %s"
                        filename="${1#--*=}-%s.t"
                        contents="${1#--*=} %s"
                        ;;
                -*)
                        BUG "invalid test_commit_bulk option: $1"
                        ;;
                *)
                        break
                        ;;
                esac
                shift
        done
        total=$1

        add_from=
        if git -C "$indir" rev-parse --quiet --verify "$ref"
        then
                add_from=t
        fi

        while test "$total" -gt 0
        do
                test_tick &&
                echo "commit $ref"
                printf 'author %s <%s> %s\n' \
                        "$GIT_AUTHOR_NAME" \
                        "$GIT_AUTHOR_EMAIL" \
                        "$GIT_AUTHOR_DATE"
                printf 'committer %s <%s> %s\n' \
                        "$GIT_COMMITTER_NAME" \
                        "$GIT_COMMITTER_EMAIL" \
                        "$GIT_COMMITTER_DATE"
                echo "data <<EOF"
                printf "$message\n" $n
                echo "EOF"
                if test -n "$add_from"
                then
                        echo "from $ref^0"
                        add_from=
                fi
                printf "M 644 inline $filename\n" $n
                echo "data <<EOF"
                printf "$contents\n" $n
                echo "EOF"
                echo
                n=$((n + 1))
                total=$((total - 1))
        done >"$tmpfile"

        git -C "$indir" \
            -c fastimport.unpacklimit=0 \
            fast-import <"$tmpfile" || return 1

        # This will be left in place on failure, which may aid debugging.
        rm -f "$tmpfile"

        # If we updated HEAD, then be nice and update the index and working
        # tree, too.
        if test "$ref" = "HEAD"
        then
                git -C "$indir" checkout -f HEAD || return 1
        fi

}

# 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 "$@" &&
        git update-index --add "--chmod=$@"
}

# Get the modebits from a file or directory, ignoring the setgid bit (g+s).
# This bit is inherited by subdirectories at their creation. So we remove it
# from the returning string to prevent callers from having to worry about the
# state of the bit in the test directory.
#
test_modebits () {
        ls -ld "$1" | sed -e 's|^\(..........\).*|\1|' \
                          -e 's|^\(......\)S|\1-|' -e 's|^\(......\)s|\1x|'
}

# Unset a configuration variable, but don't fail if it doesn't exist.
test_unconfig () {
        config_dir=
        if test "$1" = -C
        then
                shift
                config_dir=$1
                shift
        fi
        git ${config_dir:+-C "$config_dir"} config --unset-all "$@"
        config_status=$?
        case "$config_status" in
        5) # ok, nothing to unset
                config_status=0
                ;;
        esac
        return $config_status
}

# Set git config, automatically unsetting it after the test is over.
test_config () {
        config_dir=
        if test "$1" = -C
        then
                shift
                config_dir=$1
                shift
        fi
        test_when_finished "test_unconfig ${config_dir:+-C '$config_dir'} '$1'" &&
        git ${config_dir:+-C "$config_dir"} config "$@"
}

test_config_global () {
        test_when_finished "test_unconfig --global '$1'" &&
        git config --global "$@"
}

write_script () {
        {
                echo "#!${2-"$SHELL_PATH"}" &&
                cat
        } >"$1" &&
        chmod +x "$1"
}

# 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} and test_external{,_without_stderr}.
#
# The single parameter is the prerequisite tag (a simple word, in all
# capital letters by convention).

test_unset_prereq () {
        ! test_have_prereq "$1" ||
        satisfied_prereq="${satisfied_prereq% $1 *} ${satisfied_prereq#* $1 }"
}

test_set_prereq () {
        if test -n "$GIT_TEST_FAIL_PREREQS_INTERNAL"
        then
                case "$1" in
                # The "!" case is handled below with
                # test_unset_prereq()
                !*)
                        ;;
                # (Temporary?) whitelist of things we can't easily
                # pretend not to support
                SYMLINKS)
                        ;;
                # Inspecting whether GIT_TEST_FAIL_PREREQS is on
                # should be unaffected.
                FAIL_PREREQS)
                        ;;
                *)
                        return
                esac
        fi

        case "$1" in
        !*)
                test_unset_prereq "${1#!}"
                ;;
        *)
                satisfied_prereq="$satisfied_prereq$1 "
                ;;
        esac
}
satisfied_prereq=" "
lazily_testable_prereq= lazily_tested_prereq=

# Usage: test_lazy_prereq PREREQ 'script'
test_lazy_prereq () {
        lazily_testable_prereq="$lazily_testable_prereq$1 "
        eval test_prereq_lazily_$1=\$2
}

test_run_lazy_prereq_ () {
        script='
mkdir -p "$TRASH_DIRECTORY/prereq-test-dir-'"$1"'" &&
(
        cd "$TRASH_DIRECTORY/prereq-test-dir-'"$1"'" &&'"$2"'
)'
        say >&3 "checking prerequisite: $1"
        say >&3 "$script"
        test_eval_ "$script"
        eval_ret=$?
        rm -rf "$TRASH_DIRECTORY/prereq-test-dir-$1"
        if test "$eval_ret" = 0; then
                say >&3 "prerequisite $1 ok"
        else
                say >&3 "prerequisite $1 not satisfied"
        fi
        return $eval_ret
}

test_have_prereq () {
        # prerequisites can be concatenated with ','
        save_IFS=$IFS
        IFS=,
        set -- $*
        IFS=$save_IFS

        total_prereq=0
        ok_prereq=0
        missing_prereq=

        for prerequisite
        do
                case "$prerequisite" in
                !*)
                        negative_prereq=t
                        prerequisite=${prerequisite#!}
                        ;;
                *)
                        negative_prereq=
                esac

                case " $lazily_tested_prereq " in
                *" $prerequisite "*)
                        ;;
                *)
                        case " $lazily_testable_prereq " in
                        *" $prerequisite "*)
                                eval "script=\$test_prereq_lazily_$prerequisite" &&
                                if test_run_lazy_prereq_ "$prerequisite" "$script"
                                then
                                        test_set_prereq $prerequisite
                                fi
                                lazily_tested_prereq="$lazily_tested_prereq$prerequisite "
                        esac
                        ;;
                esac

                total_prereq=$(($total_prereq + 1))
                case "$satisfied_prereq" in
                *" $prerequisite "*)
                        satisfied_this_prereq=t
                        ;;
                *)
                        satisfied_this_prereq=
                esac

                case "$satisfied_this_prereq,$negative_prereq" in
                t,|,t)
                        ok_prereq=$(($ok_prereq + 1))
                        ;;
                *)
                        # Keep a list of missing prerequisites; restore
                        # the negative marker if necessary.
                        prerequisite=${negative_prereq:+!}$prerequisite
                        if test -z "$missing_prereq"
                        then
                                missing_prereq=$prerequisite
                        else
                                missing_prereq="$prerequisite,$missing_prereq"
                        fi
                esac
        done

        test $total_prereq = $ok_prereq
}

test_declared_prereq () {
        case ",$test_prereq," in
        *,$1,*)
                return 0
                ;;
        esac
        return 1
}

test_verify_prereq () {
        test -z "$test_prereq" ||
        expr >/dev/null "$test_prereq" : '[A-Z0-9_,!]*$' ||
        BUG "'$test_prereq' does not look like a prereq"
}

test_expect_failure () {
        test_start_
        test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
        test "$#" = 2 ||
        BUG "not 2 or 3 parameters to test-expect-failure"
        test_verify_prereq
        export test_prereq
        if ! test_skip "$@"
        then
                say >&3 "checking known breakage of $TEST_NUMBER.$test_count '$1': $2"
                if test_run_ "$2" expecting_failure
                then
                        test_known_broken_ok_ "$1"
                else
                        test_known_broken_failure_ "$1"
                fi
        fi
        test_finish_
}

test_expect_success () {
        test_start_
        test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
        test "$#" = 2 ||
        BUG "not 2 or 3 parameters to test-expect-success"
        test_verify_prereq
        export test_prereq
        if ! test_skip "$@"
        then
                say >&3 "expecting success of $TEST_NUMBER.$test_count '$1': $2"
                if test_run_ "$2"
                then
                        test_ok_ "$1"
                else
                        test_failure_ "$@"
                fi
        fi
        test_finish_
}

# 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 && { test_prereq=$1; shift; } || test_prereq=
        test "$#" = 3 ||
        BUG "not 3 or 4 parameters to test_external"
        descr="$1"
        shift
        test_verify_prereq
        export test_prereq
        if ! test_skip "$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.
                "$@" 2>&4
                if test "$?" = 0
                then
                        if test $test_external_has_tap -eq 0; then
                                test_ok_ "$descr"
                        else
                                say_color "" "# test_external test $descr was ok"
                                test_success=$(($test_success + 1))
                        fi
                else
                        if test $test_external_has_tap -eq 0; then
                                test_failure_ "$descr" "$@"
                        else
                                say_color error "# test_external test $descr failed: $@"
                                test_failure=$(($test_failure + 1))
                        fi
                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=${TMPDIR:-/tmp}
        stderr="$tmp/git-external-stderr.$$.tmp"
        test_external "$@" 4> "$stderr"
        test -f "$stderr" || error "Internal error: $stderr disappeared."
        descr="no stderr: $1"
        shift
        say >&3 "# expecting no stderr from previous command"
        if test ! -s "$stderr"
        then
                rm "$stderr"

                if test $test_external_has_tap -eq 0; then
                        test_ok_ "$descr"
                else
                        say_color "" "# test_external_without_stderr test $descr was ok"
                        test_success=$(($test_success + 1))
                fi
        else
                if test "$verbose" = t
                then
                        output=$(echo; echo "# Stderr is:"; cat "$stderr")
                else
                        output=
                fi
                # rm first in case test_failure exits.
                rm "$stderr"
                if test $test_external_has_tap -eq 0; then
                        test_failure_ "$descr" "$@" "$output"
                else
                        say_color error "# test_external_without_stderr test $descr failed: $@: $output"
                        test_failure=$(($test_failure + 1))
                fi
        fi
}

# debugging-friendly alternatives to "test [-f|-d|-e]"
# The commands test the existence or non-existence of $1
test_path_is_file () {
        test "$#" -ne 1 && BUG "1 param"
        if ! test -f "$1"
        then
                echo "File $1 doesn't exist"
                false
        fi
}

test_path_is_dir () {
        test "$#" -ne 1 && BUG "1 param"
        if ! test -d "$1"
        then
                echo "Directory $1 doesn't exist"
                false
        fi
}

test_path_exists () {
        test "$#" -ne 1 && BUG "1 param"
        if ! test -e "$1"
        then
                echo "Path $1 doesn't exist"
                false
        fi
}

# Check if the directory exists and is empty as expected, barf otherwise.
test_dir_is_empty () {
        test "$#" -ne 1 && BUG "1 param"
        test_path_is_dir "$1" &&
        if test -n "$(ls -a1 "$1" | egrep -v '^\.\.?$')"
        then
                echo "Directory '$1' is not empty, it contains:"
                ls -la "$1"
                return 1
        fi
}

# Check if the file exists and has a size greater than zero
test_file_not_empty () {
        test "$#" = 2 && BUG "2 param"
        if ! test -s "$1"
        then
                echo "'$1' is not a non-empty file."
                false
        fi
}

test_path_is_missing () {
        test "$#" -ne 1 && BUG "1 param"
        if test -e "$1"
        then
                echo "Path exists:"
                ls -ld "$1"
                if test $# -ge 1
                then
                        echo "$*"
                fi
                false
        fi
}

# test_line_count checks that a file has the number of lines it
# ought to. For example:
#
#       test_expect_success 'produce exactly one line of output' '
#               do something >output &&
#               test_line_count = 1 output
#       '
#
# is like "test $(wc -l <output) = 1" except that it passes the
# output through when the number of lines is wrong.

test_line_count () {
        if test $# != 3
        then
                BUG "not 3 parameters to test_line_count"
        elif ! test $(wc -l <"$3") "$1" "$2"
        then
                echo "test_line_count: line count for $3 !$1 $2"
                cat "$3"
                return 1
        fi
}

test_file_size () {
        test "$#" -ne 1 && BUG "1 param"
        test-tool path-utils file-size "$1"
}

# Returns success if a comma separated string of keywords ($1) contains a
# given keyword ($2).
# Examples:
# `list_contains "foo,bar" bar` returns 0
# `list_contains "foo" bar` returns 1

list_contains () {
        case ",$1," in
        *,$2,*)
                return 0
                ;;
        esac
        return 1
}

# Returns success if the arguments indicate that a command should be
# accepted by test_must_fail(). If the command is run with env, the env
# and its corresponding variable settings will be stripped before we
# test the command being run.
test_must_fail_acceptable () {
        if test "$1" = "env"
        then
                shift
                while test $# -gt 0
                do
                        case "$1" in
                        *?=*)
                                shift
                                ;;
                        *)
                                break
                                ;;
                        esac
                done
        fi

        case "$1" in
        git|__git*|test-tool|test_terminal)
                return 0
                ;;
        *)
                return 1
                ;;
        esac
}

# 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.
#
# Accepts the following options:
#
#   ok=<signal-name>[,<...>]:
#     Don't treat an exit caused by the given signal as error.
#     Multiple signals can be specified as a comma separated list.
#     Currently recognized signal names are: sigpipe, success.
#     (Don't use 'success', use 'test_might_fail' instead.)
#
# Do not use this to run anything but "git" and other specific testable
# commands (see test_must_fail_acceptable()).  We are not in the
# business of vetting system supplied commands -- in other words, this
# is wrong:
#
#    test_must_fail grep pattern output
#
# Instead use '!':
#
#    ! grep pattern output

test_must_fail () {
        case "$1" in
        ok=*)
                _test_ok=${1#ok=}
                shift
                ;;
        *)
                _test_ok=
                ;;
        esac
        if ! test_must_fail_acceptable "$@"
        then
                echo >&7 "test_must_fail: only 'git' is allowed: $*"
                return 1
        fi
        "$@" 2>&7
        exit_code=$?
        if test $exit_code -eq 0 && ! list_contains "$_test_ok" success
        then
                echo >&4 "test_must_fail: command succeeded: $*"
                return 1
        elif test_match_signal 13 $exit_code && list_contains "$_test_ok" sigpipe
        then
                return 0
        elif test $exit_code -gt 129 && test $exit_code -le 192
        then
                echo >&4 "test_must_fail: died by signal $(($exit_code - 128)): $*"
                return 1
        elif test $exit_code -eq 127
        then
                echo >&4 "test_must_fail: command not found: $*"
                return 1
        elif test $exit_code -eq 126
        then
                echo >&4 "test_must_fail: valgrind error: $*"
                return 1
        fi
        return 0
} 7>&2 2>&4

# 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.
#
# Accepts the same options as test_must_fail.

test_might_fail () {
        test_must_fail ok=success "$@" 2>&7
} 7>&2 2>&4

# Similar to test_must_fail and test_might_fail, but check that a
# given command exited with a given exit code. Meant to be used as:
#
#       test_expect_success 'Merge with d/f conflicts' '
#               test_expect_code 1 git merge "merge msg" B master
#       '

test_expect_code () {
        want_code=$1
        shift
        "$@" 2>&7
        exit_code=$?
        if test $exit_code = $want_code
        then
                return 0
        fi

        echo >&4 "test_expect_code: command exited with $exit_code, we wanted $want_code $*"
        return 1
} 7>&2 2>&4

# 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 () {
        test "$#" -ne 2 && BUG "2 param"
        eval "$GIT_TEST_CMP" '"$@"'
}

# Check that the given config key has the expected value.
#
#    test_cmp_config [-C <dir>] <expected-value>
#                    [<git-config-options>...] <config-key>
#
# for example to check that the value of core.bar is foo
#
#    test_cmp_config foo core.bar
#
test_cmp_config () {
        local GD &&
        if test "$1" = "-C"
        then
                shift &&
                GD="-C $1" &&
                shift
        fi &&
        printf "%s\n" "$1" >expect.config &&
        shift &&
        git $GD config "$@" >actual.config &&
        test_cmp expect.config actual.config
}

# test_cmp_bin - helper to compare binary files

test_cmp_bin () {
        test "$#" -ne 2 && BUG "2 param"
        cmp "$@"
}

# Wrapper for grep which used to be used for
# GIT_TEST_GETTEXT_POISON=false. Only here as a shim for other
# in-flight changes. Should not be used and will be removed soon.
test_i18ngrep () {
        eval "last_arg=\${$#}"

        test -f "$last_arg" ||
        BUG "test_i18ngrep requires a file to read as the last parameter"

        if test $# -lt 2 ||
           { test "x!" = "x$1" && test $# -lt 3 ; }
        then
                BUG "too few parameters to test_i18ngrep"
        fi

        if test "x!" = "x$1"
        then
                shift
                ! grep "$@" && return 0

                echo >&4 "error: '! grep $@' did find a match in:"
        else
                grep "$@" && return 0

                echo >&4 "error: 'grep $@' didn't find a match in:"
        fi

        if test -s "$last_arg"
        then
                cat >&4 "$last_arg"
        else
                echo >&4 "<File '$last_arg' is empty>"
        fi

        return 1
}

# Call any command "$@" but be more verbose about its
# failure. This is handy for commands like "test" which do
# not output anything when they fail.
verbose () {
        "$@" && return 0
        echo >&4 "command failed: $(git rev-parse --sq-quote "$@")"
        return 1
}

# Check if the file expected to be empty is indeed empty, and barfs
# otherwise.

test_must_be_empty () {
        test "$#" -ne 1 && BUG "1 param"
        test_path_is_file "$1" &&
        if test -s "$1"
        then
                echo "'$1' is not empty, it contains:"
                cat "$1"
                return 1
        fi
}

# Tests that its two parameters refer to the same revision, or if '!' is
# provided first, that its other two parameters refer to different
# revisions.
test_cmp_rev () {
        local op='=' wrong_result=different

        if test $# -ge 1 && test "x$1" = 'x!'
        then
            op='!='
            wrong_result='the same'
            shift
        fi
        if test $# != 2
        then
                BUG "test_cmp_rev requires two revisions, but got $#"
        else
                local r1 r2
                r1=$(git rev-parse --verify "$1") &&
                r2=$(git rev-parse --verify "$2") || return 1

                if ! test "$r1" "$op" "$r2"
                then
                        cat >&4 <<-EOF
                        error: two revisions point to $wrong_result objects:
                          '$1': $r1
                          '$2': $r2
                        EOF
                        return 1
                fi
        fi
}

# Compare paths respecting core.ignoreCase
test_cmp_fspath () {
        if test "x$1" = "x$2"
        then
                return 0
        fi

        if test true != "$(git config --get --type=bool core.ignorecase)"
        then
                return 1
        fi

        test "x$(echo "$1" | tr A-Z a-z)" =  "x$(echo "$2" | tr A-Z a-z)"
}

# Print a sequence of integers in increasing order, either with
# two arguments (start and end):
#
#     test_seq 1 5 -- outputs 1 2 3 4 5 one line at a time
#
# or with one argument (end), in which case it starts counting
# from 1.

test_seq () {
        case $# in
        1)      set 1 "$@" ;;
        2)      ;;
        *)      BUG "not 1 or 2 parameters to test_seq" ;;
        esac
        test_seq_counter__=$1
        while test "$test_seq_counter__" -le "$2"
        do
                echo "$test_seq_counter__"
                test_seq_counter__=$(( $test_seq_counter__ + 1 ))
        done
}

# 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.
#
# Note that under --immediate mode, no clean-up is done to help diagnose
# what went wrong.

test_when_finished () {
        # We cannot detect when we are in a subshell in general, but by
        # doing so on Bash is better than nothing (the test will
        # silently pass on other shells).
        test "${BASH_SUBSHELL-0}" = 0 ||
        BUG "test_when_finished does nothing in a subshell"
        test_cleanup="{ $*
                } && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
}

# This function can be used to schedule some commands to be run
# unconditionally at the end of the test script, e.g. to stop a daemon:
#
#       test_expect_success 'test git daemon' '
#               git daemon &
#               daemon_pid=$! &&
#               test_atexit 'kill $daemon_pid' &&
#               hello world
#       '
#
# The commands will be executed before the trash directory is removed,
# i.e. the atexit commands will still be able to access any pidfiles or
# socket files.
#
# Note that these commands will be run even when a test script run
# with '--immediate' fails.  Be careful with your atexit commands to
# minimize any changes to the failed state.

test_atexit () {
        # We cannot detect when we are in a subshell in general, but by
        # doing so on Bash is better than nothing (the test will
        # silently pass on other shells).
        test "${BASH_SUBSHELL-0}" = 0 ||
        BUG "test_atexit does nothing in a subshell"
        test_atexit_cleanup="{ $*
                } && (exit \"\$eval_ret\"); eval_ret=\$?; $test_atexit_cleanup"
}

# Deprecated wrapper for "git init", use "git init" directly instead
# Usage: test_create_repo <directory>
test_create_repo () {
        git init "$@"
}

# This function helps on symlink challenged file systems when it is not
# important that the file system entry is a symbolic link.
# Use test_ln_s_add instead of "ln -s x y && git add y" to add a
# symbolic link entry y to the index.

test_ln_s_add () {
        if test_have_prereq SYMLINKS
        then
                ln -s "$1" "$2" &&
                git update-index --add "$2"
        else
                printf '%s' "$1" >"$2" &&
                ln_s_obj=$(git hash-object -w "$2") &&
                git update-index --add --cacheinfo 120000 $ln_s_obj "$2" &&
                # pick up stat info from the file
                git update-index "$2"
        fi
}

# This function writes out its parameters, one per line
test_write_lines () {
        printf "%s\n" "$@"
}

perl () {
        command "$PERL_PATH" "$@" 2>&7
} 7>&2 2>&4

# Given the name of an environment variable with a bool value, normalize
# its value to a 0 (true) or 1 (false or empty string) return code.
#
#   test_bool_env GIT_TEST_HTTPD <default-value>
#
# Return with code corresponding to the given default value if the variable
# is unset.
# Abort the test script if either the value of the variable or the default
# are not valid bool values.

test_bool_env () {
        if test $# != 2
        then
                BUG "test_bool_env requires two parameters (variable name and default value)"
        fi

        git env--helper --type=bool --default="$2" --exit-code "$1"
        ret=$?
        case $ret in
        0|1)    # unset or valid bool value
                ;;
        *)      # invalid bool value or something unexpected
                error >&7 "test_bool_env requires bool values both for \$$1 and for the default fallback"
                ;;
        esac
        return $ret
}

# Exit the test suite, either by skipping all remaining tests or by
# exiting with an error. If our prerequisite variable $1 falls back
# on a default assume we were opportunistically trying to set up some
# tests and we skip. If it is explicitly "true", then we report a failure.
#
# The error/skip message should be given by $2.
#
test_skip_or_die () {
        if ! test_bool_env "$1" false
        then
                skip_all=$2
                test_done
        fi
        error "$2"
}

# The following mingw_* functions obey POSIX shell syntax, but are actually
# bash scripts, and are meant to be used only with bash on Windows.

# A test_cmp function that treats LF and CRLF equal and avoids to fork
# diff when possible.
mingw_test_cmp () {
        # Read text into shell variables and compare them. If the results
        # are different, use regular diff to report the difference.
        local test_cmp_a= test_cmp_b=

        # When text came from stdin (one argument is '-') we must feed it
        # to diff.
        local stdin_for_diff=

        # Since it is difficult to detect the difference between an
        # empty input file and a failure to read the files, we go straight
        # to diff if one of the inputs is empty.
        if test -s "$1" && test -s "$2"
        then
                # regular case: both files non-empty
                mingw_read_file_strip_cr_ test_cmp_a <"$1"
                mingw_read_file_strip_cr_ test_cmp_b <"$2"
        elif test -s "$1" && test "$2" = -
        then
                # read 2nd file from stdin
                mingw_read_file_strip_cr_ test_cmp_a <"$1"
                mingw_read_file_strip_cr_ test_cmp_b
                stdin_for_diff='<<<"$test_cmp_b"'
        elif test "$1" = - && test -s "$2"
        then
                # read 1st file from stdin
                mingw_read_file_strip_cr_ test_cmp_a
                mingw_read_file_strip_cr_ test_cmp_b <"$2"
                stdin_for_diff='<<<"$test_cmp_a"'
        fi
        test -n "$test_cmp_a" &&
        test -n "$test_cmp_b" &&
        test "$test_cmp_a" = "$test_cmp_b" ||
        eval "diff -u \"\$@\" $stdin_for_diff"
}

# $1 is the name of the shell variable to fill in
mingw_read_file_strip_cr_ () {
        # Read line-wise using LF as the line separator
        # and use IFS to strip CR.
        local line
        while :
        do
                if IFS=$'\r' read -r -d $'\n' line
                then
                        # good
                        line=$line$'\n'
                else
                        # we get here at EOF, but also if the last line
                        # was not terminated by LF; in the latter case,
                        # some text was read
                        if test -z "$line"
                        then
                                # EOF, really
                                break
                        fi
                fi
                eval "$1=\$$1\$line"
        done
}

# Like "env FOO=BAR some-program", but run inside a subshell, which means
# it also works for shell functions (though those functions cannot impact
# the environment outside of the test_env invocation).
test_env () {
        (
                while test $# -gt 0
                do
                        case "$1" in
                        *=*)
                                eval "${1%%=*}=\${1#*=}"
                                eval "export ${1%%=*}"
                                shift
                                ;;
                        *)
                                "$@" 2>&7
                                exit
                                ;;
                        esac
                done
        )
} 7>&2 2>&4

# Returns true if the numeric exit code in "$2" represents the expected signal
# in "$1". Signals should be given numerically.
test_match_signal () {
        if test "$2" = "$((128 + $1))"
        then
                # POSIX
                return 0
        elif test "$2" = "$((256 + $1))"
        then
                # ksh
                return 0
        fi
        return 1
}

# Read up to "$1" bytes (or to EOF) from stdin and write them to stdout.
test_copy_bytes () {
        perl -e '
                my $len = $ARGV[1];
                while ($len > 0) {
                        my $s;
                        my $nread = sysread(STDIN, $s, $len);
                        die "cannot read: $!" unless defined($nread);
                        last unless $nread;
                        print $s;
                        $len -= $nread;
                }
        ' - "$1"
}

# run "$@" inside a non-git directory
nongit () {
        test -d non-repo ||
        mkdir non-repo ||
        return 1

        (
                GIT_CEILING_DIRECTORIES=$(pwd) &&
                export GIT_CEILING_DIRECTORIES &&
                cd non-repo &&
                "$@" 2>&7
        )
} 7>&2 2>&4

# convert function arguments or stdin (if not arguments given) to pktline
# representation. If multiple arguments are given, they are separated by
# whitespace and put in a single packet. Note that data containing NULs must be
# given on stdin, and that empty input becomes an empty packet, not a flush
# packet (for that you can just print 0000 yourself).
packetize () {
        if test $# -gt 0
        then
                packet="$*"
                printf '%04x%s' "$((4 + ${#packet}))" "$packet"
        else
                perl -e '
                        my $packet = do { local $/; <STDIN> };
                        printf "%04x%s", 4 + length($packet), $packet;
                '
        fi
}

# Parse the input as a series of pktlines, writing the result to stdout.
# Sideband markers are removed automatically, and the output is routed to
# stderr if appropriate.
#
# NUL bytes are converted to "\\0" for ease of parsing with text tools.
depacketize () {
        perl -e '
                while (read(STDIN, $len, 4) == 4) {
                        if ($len eq "0000") {
                                print "FLUSH\n";
                        } else {
                                read(STDIN, $buf, hex($len) - 4);
                                $buf =~ s/\0/\\0/g;
                                if ($buf =~ s/^[\x2\x3]//) {
                                        print STDERR $buf;
                                } else {
                                        $buf =~ s/^\x1//;
                                        print $buf;
                                }
                        }
                }
        '
}

# Converts base-16 data into base-8. The output is given as a sequence of
# escaped octals, suitable for consumption by 'printf'.
hex2oct () {
        perl -ne 'printf "\\%03o", hex for /../g'
}

# Set the hash algorithm in use to $1.  Only useful when testing the testsuite.
test_set_hash () {
        test_hash_algo="$1"
}

# Detect the hash algorithm in use.
test_detect_hash () {
        test_hash_algo="${GIT_TEST_DEFAULT_HASH:-sha1}"
}

# Load common hash metadata and common placeholder object IDs for use with
# test_oid.
test_oid_init () {
        test -n "$test_hash_algo" || test_detect_hash &&
        test_oid_cache <"$TEST_DIRECTORY/oid-info/hash-info" &&
        test_oid_cache <"$TEST_DIRECTORY/oid-info/oid"
}

# Load key-value pairs from stdin suitable for use with test_oid.  Blank lines
# and lines starting with "#" are ignored.  Keys must be shell identifier
# characters.
#
# Examples:
# rawsz sha1:20
# rawsz sha256:32
test_oid_cache () {
        local tag rest k v &&

        { test -n "$test_hash_algo" || test_detect_hash; } &&
        while read tag rest
        do
                case $tag in
                \#*)
                        continue;;
                ?*)
                        # non-empty
                        ;;
                *)
                        # blank line
                        continue;;
                esac &&

                k="${rest%:*}" &&
                v="${rest#*:}" &&

                if ! expr "$k" : '[a-z0-9][a-z0-9]*$' >/dev/null
                then
                        BUG 'bad hash algorithm'
                fi &&
                eval "test_oid_${k}_$tag=\"\$v\""
        done
}

# Look up a per-hash value based on a key ($1).  The value must have been loaded
# by test_oid_init or test_oid_cache.
test_oid () {
        local algo="${test_hash_algo}" &&

        case "$1" in
        --hash=*)
                algo="${1#--hash=}" &&
                shift;;
        *)
                ;;
        esac &&

        local var="test_oid_${algo}_$1" &&

        # If the variable is unset, we must be missing an entry for this
        # key-hash pair, so exit with an error.
        if eval "test -z \"\${$var+set}\""
        then
                BUG "undefined key '$1'"
        fi &&
        eval "printf '%s' \"\${$var}\""
}

# Insert a slash into an object ID so it can be used to reference a location
# under ".git/objects".  For example, "deadbeef..." becomes "de/adbeef..".
test_oid_to_path () {
        local basename=${1#??}
        echo "${1%$basename}/$basename"
}

# Choose a port number based on the test script's number and store it in
# the given variable name, unless that variable already contains a number.
test_set_port () {
        local var=$1 port

        if test $# -ne 1 || test -z "$var"
        then
                BUG "test_set_port requires a variable name"
        fi

        eval port=\$$var
        case "$port" in
        "")
                # No port is set in the given env var, use the test
                # number as port number instead.
                # Remove not only the leading 't', but all leading zeros
                # as well, so the arithmetic below won't (mis)interpret
                # a test number like '0123' as an octal value.
                port=${this_test#${this_test%%[1-9]*}}
                if test "${port:-0}" -lt 1024
                then
                        # root-only port, use a larger one instead.
                        port=$(($port + 10000))
                fi
                ;;
        *[!0-9]*|0*)
                error >&7 "invalid port number: $port"
                ;;
        *)
                # The user has specified the port.
                ;;
        esac

        # Make sure that parallel '--stress' test jobs get different
        # ports.
        port=$(($port + ${GIT_TEST_STRESS_JOB_NR:-0}))
        eval $var=$port
}

# Tests for the hidden file attribute on Windows
test_path_is_hidden () {
        test_have_prereq MINGW ||
        BUG "test_path_is_hidden can only be used on Windows"

        # Use the output of `attrib`, ignore the absolute path
        case "$("$SYSTEMROOT"/system32/attrib "$1")" in *H*?:*) return 0;; esac
        return 1
}

# Check that the given command was invoked as part of the
# trace2-format trace on stdin.
#
#       test_subcommand [!] <command> <args>... < <trace>
#
# For example, to look for an invocation of "git upload-pack
# /path/to/repo"
#
#       GIT_TRACE2_EVENT=event.log git fetch ... &&
#       test_subcommand git upload-pack "$PATH" <event.log
#
# If the first parameter passed is !, this instead checks that
# the given command was not called.
#
test_subcommand () {
        local negate=
        if test "$1" = "!"
        then
                negate=t
                shift
        fi

        local expr=$(printf '"%s",' "$@")
        expr="${expr%,}"

        if test -n "$negate"
        then
                ! grep "\[$expr\]"
        else
                grep "\[$expr\]"
        fi
}

# Check that the given command was invoked as part of the
# trace2-format trace on stdin.
#
#       test_region [!] <category> <label> git <command> <args>...
#
# For example, to look for trace2_region_enter("index", "do_read_index", repo)
# in an invocation of "git checkout HEAD~1", run
#
#       GIT_TRACE2_EVENT="$(pwd)/trace.txt" GIT_TRACE2_EVENT_NESTING=10 \
#               git checkout HEAD~1 &&
#       test_region index do_read_index <trace.txt
#
# If the first parameter passed is !, this instead checks that
# the given region was not entered.
#
test_region () {
        local expect_exit=0
        if test "$1" = "!"
        then
                expect_exit=1
                shift
        fi

        grep -e '"region_enter".*"category":"'"$1"'","label":"'"$2"\" "$3"
        exitcode=$?

        if test $exitcode != $expect_exit
        then
                return 1
        fi

        grep -e '"region_leave".*"category":"'"$1"'","label":"'"$2"\" "$3"
        exitcode=$?

        if test $exitcode != $expect_exit
        then
                return 1
        fi

        return 0
}