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Question

我正在尝试制作一个脚本来自动下载 SpigotMC BuildTools，检测输入版本 (sh build.sh <version>)，并设置一个变量，如果版本大于或等于 1.14（自此版本以来） , SpigotMC 默认停止自动编译 craftbukkit 的自动化。现在它只编译 spigot jar，我需要将它们都编译用于我的个人目的。)

这是我尝试过的方法（我是 Linux 新手，所以这可能会搞砸）：

#!/bin/bash

# Sources:
# Append variables in bash                : https://www.cyberciti.biz/faq/howto-linux-unix-bash-append-textto-variables/
# Check MANIFEST.MF content from jar file : https://www.manongdao.com/q-106728.html
# Check for specified property json file  : 
#                                           https://www.ultralinux.org/post/json-bash/
# Bash Array                              : https://unix.stackexchange.com/questions/253892/syntax-error-unexpected-when-creating-an-array
# #######################################################################################################################################
# 
# #######################################################################################################################################
# BuildTools Jar Info Variables
# -----------------------------
# BuilsTools working directory
buildtools_root="$(pwd)" # We use $(command) to store "command" output in a variable. We use ${command} if we have to stick other strings near it without whitespace.
# BuildTools jar location
buildtools_jar="$buildtools_root/BuildTools.jar"
# Current BuildTools jar version
buildtools_ver="$(unzip -p "$buildtools_jar" META-INF/MANIFEST.MF | grep 'Implementation-Version:' | cut -d '-' -f 5)"
# Jenkins Api-related variables. 
# A. Retrieve BuildTools lastSuccessfulBuild link
targetJar="$(curl -s 'https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/api/json' | jq -r '.artifacts[].relativePath')"
lastSuccessfulBuild="$(curl -s 'https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/api/json' | jq -r '.url')"
# B. Make the download link
latestBuildToolsUrl="${lastSuccessfulBuild}artifacts/$targetJar"
# Latest BuildTools Build Version
latestBuildToolsVersion="$(curl -s 'https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/api/json' | jq -r '.number')"
displayFullName="$(curl -s 'https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/api/json' | jq -r '.fullDisplayName')"
# ---------------------------------------------------------------------------------------------------------------------------------------
# BuildTools Jar Run Variables
# -----------------------------
# 
# #######################################################################################################################################

# This is a function to set java home to current java version in use.
javahome_set () {
    JAVA_HOME=$(dirname "$(dirname "$( readlink -f /etc/alternatives/java )")")

    OIFS=$IFS
    IFS=':';
    for i in $VAR;
    do
            JAVA1=$i/bin/java
            JAVA2=$i/java
            if [ -d "$i" ];
            then
                    if [ ! -L "$JAVA1" ] && [ -x "$JAVA1" ] || [ ! -L "$JAVA2" ] && [ -x "$JAVA2" ]; then
                        echo "dropping path: $i";
                    else
                        NEW=$NEW:$i
                    fi
            fi
    done
    IFS=$OIFS
    JAVA_HOME=$NEW:$JAVA_HOME/bin
    JAVA_HOME=${JAVA_HOME#:*}

}
javahome_set

# This function requires arguments. Checks if  >= 
vercomp () {
    if [[  ==  ]]
    then
        return 0
    fi
    local IFS=.
    local i ver1=() ver2=()
    # fill empty fields in ver1 with zeros
    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
    do
        ver1[i]=0
    done
    for ((i=0; i<${#ver1[@]}; i++))
    do
        if [[ -z ${ver2[i]} ]]
        then
            # fill empty fields in ver2 with zeros
            ver2[i]=0
        fi
        if ((10#${ver1[i]} > 10#${ver2[i]}))
        then
            return 1
        fi
        if ((10#${ver1[i]} < 10#${ver2[i]}))
        then
            return 2
        fi
    done
    return 0
}

# This is a function to download the latest BuildTools version and check if download is successful.
buildtools_download () {
    curl --silent "$latestBuildToolsUrl" --output BuildTools.jar #Request download to BuildTools.
    if [ "$?" -eq 0 ]; then #Check if file was downloaded. It returns error code non-zero if file was not properly downloaded. (in this  language)
        echo "$Green Successful downloaded BuildTools.$Color_Off"
    else
        echo "$Red Error while downloading BuildTools. $Color_Off"
    fi
}

# This is a function to check for updates for BuildTools jar
buildtools_check () {
    if [ ! -e "$buildtools_jar" ]; then #If BuildTools.jar does NOT exist in "BuildTools" folder
        echo "$Yellow Downloading BuildTools..."
        buildtools_download 
        exit
    elif [ -e "$buildtools_jar" ]; then
        if [ "$buildtools_ver" -lt "$latestBuildToolsVersion" ]; then
            echo "$Blue Updating BuildTools... $Color_Off"
            rm "$buildtools_jar"
            buildtools_download
        fi
    else
        echo "$Cyan BuildTools is up to date. $Color_Off"
    fi
}

info_menu () {
echo "==============================================[Local-Info]=============================================="
echo "BuildTools Root     : $buildtools_root"
echo "Executable Path     : $buildtools_jar"
echo "Installed Version   : $buildtools_ver"
echo "JAVA_HOME Directory : $JAVA_HOME"
echo "=============================================[JsonAPI-Info]============================================="
echo "Latest Download Url: $latestBuildToolsUrl"
echo "========================================================================================================"
echo
if [ "$buildtools_ver" -eq "$latestBuildToolsVersion" ]; then
    echo "$Green You have the latest SpigotMC BuildTools version. $Color_Off"
else
    echo "$Yellow A new build is available : $displayFullName"
fi
echo
}

if [ -z "" ]; then
    echo "$BCyan Usage: [=11=] $BBlue<version> $Color_Off" & exit #By default, [=11=] is the name of this file
else
    if [ -d "" ]; then #If argument is defined
        if [ "" = "latest" ]; then
            buildtools_check
        else
            vercomp "" "1.14"
            if [ $? -eq 0 -o $? -eq 1 ]; then
                BothJars=(--compile craftbukkit,spigot)  # means  >= 1.14 ; sets the $BothJars variable
                buildtools_check
            fi
        if [ "" -lt "1.14" ]; then
            echo "$Yellow You want to build an older server version. Good choice btw."
            buildtools_check
        fi
    fi
fi
    rm -rf "" && mkdir ""
    cd "" || exit
    java -jar ./BuildTools.jar --rev "" "${BothJars[@]}" --generate-source --generate-docs #../filename is for executing it from one dir far.

我已经添加了评论，以便您了解发生了什么。

有人可以帮我解决这个问题吗？

编辑：如果您曾经玩过 Minecraft，或者如果您看过不同版本的 Minecraft，您可能会遇到以下版本格式：

1.7.10 ; 1.8; 1.13.2 ; 1.14; 1.15.3（不，没有“1.8.0”版本。只有“1.8”）

以下是 tr 命令后数学错误版本之间的比较示例：

1.8 > 1.7.10 - 18 > 1710
1.14 > 1.13.2 - 114 > 1132

1.15.2 < 1.16 - 1152 < 116

所以...可能存在影响这些数字比较的问题，因为它们是版本，而不是分数或整数。

编辑 2：我不会进行超过 3 次编辑/post。感谢 Richard K. 帮助我实现版本检查功能！我重写了我的脚本以使其更完整。我将重要的部分存储在函数中以节省 space 并更加可见。摘要：我不明白我在这里做错了什么。 U_U

编辑 3：根据 Rachid K 的回答，我对这部分进行了测试：

#!/bin/bash

vercomp () {
    if [[  ==  ]]
    then
        return 0
    fi
    local IFS=.
    local i ver1=() ver2=()
    # fill empty fields in ver1 with zeros
    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
    do
        ver1[i]=0
    done
    for ((i=0; i<${#ver1[@]}; i++))
    do
        if [[ -z ${ver2[i]} ]]
        then
            # fill empty fields in ver2 with zeros
            ver2[i]=0
        fi
        if ((10#${ver1[i]} > 10#${ver2[i]}))
        then
            return 1
        fi
        if ((10#${ver1[i]} < 10#${ver2[i]}))
        then
            return 2
        fi
    done
    return 0
}

if [ -z "" ]; then
    echo "$BCyan Usage: [=12=] $BBlue<version> $Color_Off" & exit #By default, [=12=] is the name of this file
else
    if [ -d "" ]; then #If argument is defined
        if [ "" = "latest" ]; then
            echo "Building latest version"
        else
            vercomp "" "1.14"
            rc=$?
            case $rc in
            0)
            echo " You want to build version 1.14"
            ;;
            1)
            echo " You want to build version above 1.14"
            ;;
            2)
            echo " You want to build version below 1.14"
            ;;
            latest)
            echo " You want to build latest version."
            ;;
            esac
        fi
    fi
fi

因此 vercomp() 应该查看是否：$1 等于最新的字符串； $1 大于或等于 1.14 ； $1 低于 1.14。

功能看起来不错，但是echo命令不显示。我注意到在某些情况下，由于缺少双引号，echo 命令不会显示。所以......把它放在它上面。但它不起作用。为什么？

Answer 1

显然，您获得的版本要么是像 1.14 这样的数字，要么是“最新”字符串。您需要拆分检查两个测试。首先检查“最新”值：

if [ "" = "latest" ]

如果为假，请使用此post

中提出的解决方案检查版本

vercomp () {
    if [[  ==  ]]
    then
        return 0
    fi
    local IFS=.
    local i ver1=() ver2=()
    # fill empty fields in ver1 with zeros
    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
    do
        ver1[i]=0
    done
    for ((i=0; i<${#ver1[@]}; i++))
    do
        if [[ -z ${ver2[i]} ]]
        then
            # fill empty fields in ver2 with zeros
            ver2[i]=0
        fi
        if ((10#${ver1[i]} > 10#${ver2[i]}))
        then
            return 1
        fi
        if ((10#${ver1[i]} < 10#${ver2[i]}))
        then
            return 2
        fi
    done
    return 0
}

因此，要比较版本，只需执行以下操作：

vercomp "" "1.14"
rc=$?
case $rc in
    0) echo '=';;
    1) echo '>';;
    2) echo '<';;
esac

Answer 2

我没有在任何地方看到 $BCyan 和 $BMagenta 变量定义，所以只有空白文本而不是它们。
第 7 行条件的问题是您正在比较两个字符串值，但实际上您想要比较实数（或字符串“最新”）。对于实数，最好使用 bc 实用程序。这是等同于您要执行的操作的代码（我认为）：

if [ `echo ">=1.14"|bc` -eq 1 ] || [  == "latest" ]; then

Bash - 存储在变量中的文本作为参数时无法识别

Bash - Text stored in variable is not recognized when put it as argument

portability

sh

debian-based