Avoiding property substitution by escaping does not remove escape character
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Key: FELIX-2366
URL: https://issues.apache.org/jira/browse/FELIX-2366
Project: Felix
Issue Type: Bug
Components: File Install
Affects Versions: fileinstall-3.0.0
Reporter: Bengt Rodehav
To avoid property substitution, an escape character was introduced in version
3.0.0 of File Install. The idea is that if I want to send the configuration
value
${propkey}
to my application without property substitution to take place, I can escape the
START_DELIM (${) and STOP_DELIM (}) with a backslash as follows:
$\{propkey\}
However, when doing this the escape character is not removed from the string.
The reason is as follows:
The method of interest is substVars in class
org.apache.felix.fileinstall.internal.Util. The logic tries to find matching
DELIM_START (${) and DELIM_STOP (}). When you escape either of these (by
specifying a backslash before "${" and/or "}"), the logic will never find
matching DELIM_START and DELIM_STOP which causes the method to immediately
return without performing property substitution. The logic at the end of the
method (that removes the backslashes) is never reached.
A workarount is to add an unnecessary property at the end of the value just to
make sure some property substitution will take place since then the logic at
the end of the substVars() method (that removes the escape character) will be
reached. Thus, this works:
$\{propkey\}${#}
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