We will give this more thought. Ant only needs one replacement engine to
work on all platforms, but I don't know of a specific reason that nawk
should not be just as capable as sed.
To summarize,
Using 4-backslash replacement nawk on ubuntu:
arg : -Dfoo=dollar$_backtick`_single'_double"_trailingbackslash\
quoted_arg: "-Dfoo=dollar\$_backtick\`_single'_double\"_trailingbackslash
\\"
....
[echo] foo=dollar$_backtick`_single'_double"_trailingbackslash\_
Using 8-backslash replacement nawk on ubuntu:
arg : -Dfoo=dollar$_backtick`_single'_double"_trailingbackslash\
quoted_arg: "-Dfoo=dollar\$_backtick\`_single'_double\"_trailingbackslash
\\\\"
....
[echo] foo=dollar$_backtick`_single'_double"_trailingbackslash\\_
Using 4-backslash replacement nawk(?) on your machine:
arg : -Dfoo=trail\ingbackslash\
quoted_arg: "-Dfoo=trail\ingbackslash\"
....
error output (clearly failed to double the backslash during quoting)
Using 8-backslash replacement nawk on your machine:
arg : -Dfoo=trail\ingbackslash\
quoted_arg: "-Dfoo=trail\\ingbackslash\\"
...
arg : -Dfoo=trail\ingbackslash\
quoted_arg: "-Dfoo=trail\\ingbackslash\\"
The goal of the line is to replace one backslash literal with two. The
other awk patterns are correctly replacing with two backslashes in the
replacement pattern; introducing a single new backslash literal in the
output. Not sure why this backslash should be different. I think
4-backslash is the correct number unless something is doing an extra pass
of interpretation of the argument.
Maybe the slash-string pattern is being interpreted differently. Can we try
it as just plain double-quote strings?
'awk')
esc_arg="$(printf '%s' "$esc_arg" | "$awk_exec" '{ gsub("\\\\",
"\\\\"); print }' )"
esc_arg="$(printf '%s' "$esc_arg" | "$awk_exec" '{ gsub("\\$",
"\\$"); print }' )"
esc_arg="$(printf '%s' "$esc_arg" | "$awk_exec" '{ gsub("\"",
"\\\""); print }' )"
esc_arg="$(printf '%s' "$esc_arg" | "$awk_exec" '{ gsub("`",
"\\`"); print }' )"
Regards,
Jeff Adamson
From: Johan Corveleyn <[email protected]>
To: Ant Developers List <[email protected]>
Date: 10/28/2016 07:36 PM
Subject: Re: ant wrapper script testing
On Fri, Oct 28, 2016 at 10:41 PM, Johan Corveleyn <[email protected]>
wrote:
...
> Yes, that works perfectly! On Solaris 11, with your latest version of
> the ant wrapper. When I run your test.sh, with the test.xml, I get
> exactly the correct output.
>
> However, with esc_tool=awk it fails. Don't know why yet, but the first
> property makes it fail already:
>
> [[
> bash-4.1> ./ant.new
> "-Dfoo=dollar\$_backtick\`_single'_double\"_trailingbackslash\\" -f
> test.xml
> Buildfile: build.xml does not exist!
> Build failed
> ]]
>
> With -version there is no problem, and running with '-f test.xml'
> without properties also works (and fwiw, "-Ddoublespace= " also
> works).
Okay, so the problem with the awk variant on Solaris is only with the
trailing backslash. If I remove that from the test input, all other
tests work.
This change (doubling the backslashes even more) seems to fix it, but
I have no idea if it breaks the awk variant on other platforms:
[[
bash-4.1> diff ant.new ant.new.edited
63c63
< esc_arg="$(printf '%s' "$esc_arg" | "$awk_exec" '{
gsub(/\\/, "\\\\"); print }' )"
---
> esc_arg="$(printf '%s' "$esc_arg" | "$awk_exec" '{ gsub(/\\/,
"\\\\\\\\"); print }' )"
]]
Here is output of the awk variant with your version:
[[
bash-4.1> ./ant.new --execdebug "-Dfoo=trail\\ingbackslash\\" -f test.xml
arg : -Dfoo=trail\ingbackslash\
quoted_arg: "-Dfoo=trail\ingbackslash\"
arg : -f
quoted_arg: "-f"
arg : test.xml
quoted_arg: "test.xml"
exec "$JAVACMD" -Xmx512m -Djava.awt.headless=true -XX:MaxPermSize=140m
-classpath "$LOCALCLASSPATH" -Dant.home="$ANT_HOME"
-Dant.library.dir="$ANT_LIB" org.apache.tools.ant.launch.Launcher
-cp "$CLASSPATH" "-Dfoo=trail\ingbackslash\" "-f" "test.xml"
Buildfile: build.xml does not exist!
Build failed
]]
And with ant.new.edited:
[[
bash-4.1> ./ant.new.edited --execdebug "-Dfoo=trail\\ingbackslash\\" -f
test.xml
arg : -Dfoo=trail\ingbackslash\
quoted_arg: "-Dfoo=trail\\ingbackslash\\"
arg : -f
quoted_arg: "-f"
arg : test.xml
quoted_arg: "test.xml"
exec "$JAVACMD" -Xmx512m -Djava.awt.headless=true -XX:MaxPermSize=140m
-classpath "$LOCALCLASSPATH" -Dant.home="$ANT_HOME"
-Dant.library.dir="$ANT_LIB" org.apache.tools.ant.launch.Launcher
-cp "$CLASSPATH" "-Dfoo=trail\ingbackslash\" "-f" "test.xml"
Buildfile: /data/tools/ant/apache-ant-1.9.7/bin/test.xml
run:
[echo] hello world
[echo] foo=trail\ingbackslash\_
[echo] bar=${bar}_
[echo] nl=${nl}_
[echo] nlnl=${nlnl}_
[echo] nlnlnl=${nlnlnl}_
[echo] doublespace=${doublespace}_
[echo] end
BUILD SUCCESSFUL
Total time: 0 seconds
]]
--
Johan
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