Dollar sign as a string parameter in Jenkins job is doubled

user_5246617 0
Viewed 977

I builded Jenkins with parameters in my configuration: 

a = a$
b = b$$
c = c$$$
d = d$$$$
e = e$e$e$e$

I builded my pipeline and it contained this possibilities how to display content of environment variables:

sh """
    echo "${env.a}"
    echo "\$a"
    echo "${env.b}"
    echo "\$b"
    echo "${env.c}"
    echo "\$c"
    echo "${env.d}"
    echo "\$d"
    echo "${env.e}"
    echo "\$e"
"""

It returned:

+ echo 'a$'
a$
+ echo 'a$$'
a$$
+ echo 'b$'
b$
+ echo 'b$$'
b$$
+ echo c14
c14
+ echo 'c$$$$'
c$$$$
+ echo d14
d14
+ echo 'd$$$$'
d$$$$
+ echo 'eeee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$14'
eeee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$14
+ echo 'ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$'
ee$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$e$$$$

Anyone who can explain this behaviour?

jenkins-groovy jenkins-pipeline jenkins
1 Answers

First of all - very interesting problem. Results are... unusual :)

I couldn't reproduce 100% of your results on my Jenkins, it's probably version/platform dependent. But fortunately the most interesting parameter e returned all that mess. So I'll focus on in.

It looks like parameters are evaluated before they are passed to environment. So each occurrence of $e is replaced by current value of e variable (which is e$e$e$e$ so far). So, we have e then three times $e replaced by e$e$e$e$ and finally $. The result is: e e$e$e$e$ e$e$e$e$ e$e$e$e$ $ (spaces added for readability). And this is value stored in environment. You can see it printed by your last echo (but with every $ replaced by $$).

The longest output (echo "${env.e}") doesn't do anything new - it just takes ee$e$e$e$e$e$e$e$e$e$e$e$$ and evaluates it one more time, replacing every occurrence of $e by ee$e$e$e$e$e$e$e$e$e$e$e$$. And finally, replaces every $ by $$ when printing :)

user_295640
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