修改构建的 Jenkins 描述

我想remotely更改 Jenkins 构建描述。我的脚本已全部准备就绪，除了一个小问题：多行描述。

我在 Jenkins 中使用 REST API 和 JSON 来下载旧的描述：

old_description=$(curl -s --user "$USER:$PASSWORD" --data-urlencode "tree=description" \
    "$jenkins_url/job/$job_name/$build_number/api/json")

old_description=${old_description#*:\"} #Remove JSON garbage
old_description=${old_description%\"\}} #Remove JSON garbage

`curl 命令拉出：

<font color=blue><b>At first you don't succeed. Try again</b></font><br/>
\r\n<font color=gold><b>At first you don't succeed. Try again</b></font><br/>
\r\n<font color=green><b>At first you don't succeed. Try again</b></font>

(Note：我添加了换行符以使上面的内容更易于阅读。这是作为单行拉出的）。

The \r\n是单独的行，所以我这样做：

old_description=$(sed 's/\\r\\n/\
/g' <<<$old_description)

这改变了$old_description to:

font color=blue><b>At first you don't succeed. Try again</b></font><br/>
<font color=gold><b>At first you don't succeed. Try again</b></font><br/>
<font color=green><b>At first you don't succeed. Try again</b></font>

(NOTE：新行是值的一部分。这是三行描述。）

我的程序（取决于命令行参数）可以替换、追加或在构建之前添加新的描述：

if [ "$prepend_flag" -a -n "$old_description" ] #Prepend new description to old description
then
    new_description="$new_description<br/>
$old_description"
elif [ "$append_flag" -a -n "$old_description" ] #Append new description to old description
then
   new_description="$old_description<br/>
$new_description"
fi

现在，我将重做描述：

if curl -u $USER:$PASSWORD   --data-urlencode "description=$new_description" \
    --data-urlencode "Submit=Submit" \
    "$jenkins_url/job/$job_name/$build_number/submitDescription"
then
    echo "Description successfully changed on Build #$build_number in Jenkins job $job_name"
else
    echo "WARNING: Description was not set. Manually change the descripiton of the build"
    echo "         for Build #$build_number in Jenkins job $job_name"
fi

如果我第一次在前面或附加新的描述，我会在 Jenkins 中得到以下信息：

<font color=blue><b>At first you don't succeed. Try again</b></font><br/>
<font color=gold><b>At first you don't succeed. Try again</b></font><br/>
<font color=green><b>At first you don't succeed. Try again</b></font><br/>
<font color=red><b>My new description</b></font><br/>

看起来不错。下次再这样就不行了。我明白了：

<font color=blue><b>At first you don't succeed. Try again</b></font><br/>\n<font color=gold><b>At first you don't succeed. Try again</b></font><br/>\n<font color=green><b>At first you don't succeed. Try again</b></font><br/>\n<font color=red><b>My new description</b></font><br/>
<font color=blue><b>My new new description</b></font>

请注意\n出现。

我该如何解决这个问题？

我已经把整个程序放进去了pastebin.

我玩这个玩了好久...

首先，不要这样做：

    new_description="$new_description<br/>
$old_description"

要附加或前置该行，我使用了printf:

new_description="$(printf "$new_description\r\n$old_description")"

通过使用printf，我放了一个<CR><LF>而不仅仅是一个<LF>在我的描述行分隔符中。这样我就不会有一堆乱七八糟的东西了<NL> and <CR><NL>我不再依赖操作系统对换行符的定义。

The sed命令花了我很长时间才弄清楚。我尝试了各种各样的事情：

old_description=$(sed 's/\\r\\n/\r\n/g' <<<$old_description)

但是，似乎没有任何作用......我尝试了-E允许我使用的标志extended正则表达式，但它一直在解释\r\n作为替换\\r\\n with literal 'rn.

经过几个小时，我终于尝试使用双引号而不是单引号：

old_description=$(sed "s/\\r\\n/\r\n/g" <<<$old_description)

成功了！通常在 sed 中使用单引号来保护正则表达式免遭插值。然而，单引号也杀死了插值\r\n as <CR><LF>。用双引号更改它们解决了问题。