FileEdit - search_file_replace_line - Replace with content found

Hello

We are using chef-solo 11.8.2 and in a recipe, I’d like to use
Chef::Util::FileEdit.search_file_replace_line to replace a line
matching some regexp and “capture” what has been found and use this in
the replacement.

How? :slight_smile:

Now, in a recipe, we have got the following:

ruby_block “CIS: AutoFS start deaktivieren” do
block do
fe = Chef::Util::FileEdit.new("/etc/init/autofs.conf")
# “start on” auskommentieren
fe.search_file_replace_line(/^(start on.*)/,
"# removed because of CIS check:\n# \1"
)

    # Datei schreiben
    fe.write_file
end # of block do

end # of ruby_block “CIS: AutoFS start deaktivieren” do

This is supposed to comment any lines starting with “start on” in the
autofs.conf file. It should replace the lines with the following
"block":

removed because of CIS check:

start on…

With perl, I used to have this:

perl -pi -e ‘s/^(start on.*)/# removed because of CIS check:\n# $1/’
/etc/autofs.conf

This works.

But this does not:

    fe.search_file_replace_line(/^(start on.*)/,
        "# removed because of CIS check:\n# \1"
        )

It has replaced the “start on” lines just fine, but it added a \1…
It should have replaced the \1 by what’s in the first “caputre”
(parentheses; ie. what’s in “(” … “)”; ie. “start on” and whatever is
following it).

How to do that?

Thanks a lot,

Alexander

=> Google+ => http://plus.skwar.me <==
=> Chat (Jabber/Google Talk) => a.skwar@gmail.com <==

I notice in poking through the source
https://github.com/chef/chef/blob/11.8.2/lib/chef/util/file_edit.rb#L109-L110
that Chef::Util::FileEdit#replace uses gsub!, while
Chef::Util::FileEdit#replace_line doesn’t.

gsub! will use your backreferences. Since your regexp starts with ^ and
ends with .*, it will match the entire line anyways; perhaps try replace
instead?

Matt Moretti

On Thu, Aug 27, 2015 at 8:34 AM, Alexander Skwar <
alexanders.mailinglists+nospam@gmail.com> wrote:

Hello

We are using chef-solo 11.8.2 and in a recipe, I’d like to use
Chef::Util::FileEdit.search_file_replace_line to replace a line
matching some regexp and “capture” what has been found and use this in
the replacement.

How? :slight_smile:

Now, in a recipe, we have got the following:

ruby_block “CIS: AutoFS start deaktivieren” do
block do
fe = Chef::Util::FileEdit.new("/etc/init/autofs.conf")
# “start on” auskommentieren
fe.search_file_replace_line(/^(start on.*)/,
"# removed because of CIS check:\n# \1"
)

    # Datei schreiben
    fe.write_file
end # of block do

end # of ruby_block “CIS: AutoFS start deaktivieren” do

This is supposed to comment any lines starting with “start on” in the
autofs.conf file. It should replace the lines with the following
"block":

removed because of CIS check:

start on…

With perl, I used to have this:

perl -pi -e ‘s/^(start on.*)/# removed because of CIS check:\n# $1/’
/etc/autofs.conf

This works.

But this does not:

    fe.search_file_replace_line(/^(start on.*)/,
        "# removed because of CIS check:\n# \1"
        )

It has replaced the “start on” lines just fine, but it added a \1…
It should have replaced the \1 by what’s in the first “caputre”
(parentheses; ie. what’s in “(” … “)”; ie. “start on” and whatever is
following it).

How to do that?

Thanks a lot,

Alexander

=> Google+ => http://plus.skwar.me <==
=> Chat (Jabber/Google Talk) => a.skwar@gmail.com <==

Hello Matt

Thanks a lot, replace works just fine :slight_smile:

For the archive, I’ve now got:

ruby_block “CIS: AutoFS start deaktivieren” do
block do
fe = Chef::Util::FileEdit.new("/etc/init/autofs.conf")
# “start on” auskommentieren
fe.search_file_replace(/^(start on.*)/,
"# removed because of CIS check:\n# \1"
)

    # Datei schreiben
    fe.write_file
end # of block do

end # of ruby_block “CIS: AutoFS start deaktivieren” do

Or see http://pastebin.com/diff.php?i=BQusWv7h for a diff…

I had to use “\1” instead of “\1”, as I’m in a double quoted string
(-> "). I’m in a double quoted string, as I’d like \n to add a new
line.

Matt,
thanks! You helped me very much!

Cheers,
Alexander

2015-08-27 15:15 GMT+02:00 Matthew Moretti werebus@gmail.com:

I notice in poking through the source that Chef::Util::FileEdit#replace uses
gsub!, while Chef::Util::FileEdit#replace_line doesn’t.

gsub! will use your backreferences. Since your regexp starts with ^ and ends
with .*, it will match the entire line anyways; perhaps try replace instead?

Matt Moretti

On Thu, Aug 27, 2015 at 8:34 AM, Alexander Skwar
alexanders.mailinglists+nospam@gmail.com wrote:

Hello

We are using chef-solo 11.8.2 and in a recipe, I’d like to use
Chef::Util::FileEdit.search_file_replace_line to replace a line
matching some regexp and “capture” what has been found and use this in
the replacement.

How? :slight_smile:

Now, in a recipe, we have got the following:

ruby_block “CIS: AutoFS start deaktivieren” do
block do
fe = Chef::Util::FileEdit.new("/etc/init/autofs.conf")
# “start on” auskommentieren
fe.search_file_replace_line(/^(start on.*)/,
"# removed because of CIS check:\n# \1"
)

    # Datei schreiben
    fe.write_file
end # of block do

end # of ruby_block “CIS: AutoFS start deaktivieren” do

This is supposed to comment any lines starting with “start on” in the
autofs.conf file. It should replace the lines with the following
"block":

removed because of CIS check:

start on…

With perl, I used to have this:

perl -pi -e ‘s/^(start on.*)/# removed because of CIS check:\n# $1/’
/etc/autofs.conf

This works.

But this does not:

    fe.search_file_replace_line(/^(start on.*)/,
        "# removed because of CIS check:\n# \1"
        )

It has replaced the “start on” lines just fine, but it added a \1…
It should have replaced the \1 by what’s in the first “caputre”
(parentheses; ie. what’s in “(” … “)”; ie. “start on” and whatever is
following it).

How to do that?

Thanks a lot,

Alexander

=> Google+ => http://plus.skwar.me <==
=> Chat (Jabber/Google Talk) => a.skwar@gmail.com <==

Alexander

=> Google+ => http://plus.skwar.me <==
=> Chat (Jabber/Google Talk) => a.skwar@gmail.com <==

You might want to take a look at the “line” cookbook. It includes resources
for managing file content in place using the FileEdit methods.

https://supermarket.chef.io/cookbooks/line

On Thu, Aug 27, 2015 at 7:35 AM, Alexander Skwar <
alexanders.mailinglists+nospam@gmail.com> wrote:

Hello Matt

Thanks a lot, replace works just fine :slight_smile:

For the archive, I’ve now got:

ruby_block “CIS: AutoFS start deaktivieren” do
block do
fe = Chef::Util::FileEdit.new("/etc/init/autofs.conf")
# “start on” auskommentieren
fe.search_file_replace(/^(start on.*)/,
"# removed because of CIS check:\n# \1"
)

    # Datei schreiben
    fe.write_file
end # of block do

end # of ruby_block “CIS: AutoFS start deaktivieren” do

Or see http://pastebin.com/diff.php?i=BQusWv7h for a diff…

I had to use “\1” instead of “\1”, as I’m in a double quoted string
(-> "). I’m in a double quoted string, as I’d like \n to add a new
line.

Matt,
thanks! You helped me very much!

Cheers,
Alexander

2015-08-27 15:15 GMT+02:00 Matthew Moretti werebus@gmail.com:

I notice in poking through the source that Chef::Util::FileEdit#replace
uses
gsub!, while Chef::Util::FileEdit#replace_line doesn’t.

gsub! will use your backreferences. Since your regexp starts with ^ and
ends
with .*, it will match the entire line anyways; perhaps try replace
instead?

Matt Moretti

On Thu, Aug 27, 2015 at 8:34 AM, Alexander Skwar
alexanders.mailinglists+nospam@gmail.com wrote:

Hello

We are using chef-solo 11.8.2 and in a recipe, I’d like to use
Chef::Util::FileEdit.search_file_replace_line to replace a line
matching some regexp and “capture” what has been found and use this in
the replacement.

How? :slight_smile:

Now, in a recipe, we have got the following:

ruby_block “CIS: AutoFS start deaktivieren” do
block do
fe = Chef::Util::FileEdit.new("/etc/init/autofs.conf")
# “start on” auskommentieren
fe.search_file_replace_line(/^(start on.*)/,
"# removed because of CIS check:\n# \1"
)

    # Datei schreiben
    fe.write_file
end # of block do

end # of ruby_block “CIS: AutoFS start deaktivieren” do

This is supposed to comment any lines starting with “start on” in the
autofs.conf file. It should replace the lines with the following
"block":

removed because of CIS check:

start on…

With perl, I used to have this:

perl -pi -e ‘s/^(start on.*)/# removed because of CIS check:\n# $1/’
/etc/autofs.conf

This works.

But this does not:

    fe.search_file_replace_line(/^(start on.*)/,
        "# removed because of CIS check:\n# \1"
        )

It has replaced the “start on” lines just fine, but it added a \1…
It should have replaced the \1 by what’s in the first “caputre”
(parentheses; ie. what’s in “(” … “)”; ie. “start on” and whatever is
following it).

How to do that?

Thanks a lot,

Alexander

=> Google+ => http://plus.skwar.me <==
=> Chat (Jabber/Google Talk) => a.skwar@gmail.com <==

Alexander

=> Google+ => http://plus.skwar.me <==
=> Chat (Jabber/Google Talk) => a.skwar@gmail.com <==