warn if apt-key is used in scripts/its output parsed

[apt.git] / doc / apt-key.8.xml

diff --git a/doc/apt-key.8.xml b/doc/apt-key.8.xml
index 5dbbaaf2691a87a9239c5bd3fe124126e4743559..e0d9f5b9575f735ea57a713be4361c511c8754b9 100644 (file)
--- a/doc/apt-key.8.xml
+++ b/doc/apt-key.8.xml
@@ -1,15 +1,9 @@
 <?xml version="1.0" encoding="utf-8" standalone="no"?>
 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
-
-<!ENTITY % aptent SYSTEM "apt.ent">
-%aptent;
-
-<!ENTITY % aptverbatiment SYSTEM "apt-verbatim.ent">
-%aptverbatiment;
-
-<!ENTITY % aptvendor SYSTEM "apt-vendor.ent">
-%aptvendor;
+<!ENTITY % aptent SYSTEM "apt.ent"> %aptent;
+<!ENTITY % aptverbatiment SYSTEM "apt-verbatim.ent"> %aptverbatiment;
+<!ENTITY % aptvendor SYSTEM "apt-vendor.ent"> %aptvendor;
 ]>
 
 <refentry>
@@ -19,7 +13,7 @@
    &apt-email;
    &apt-product;
    <!-- The last update date -->
-   <date>2012-06-09T00:00:00Z</date>
+   <date>2016-07-01T00:00:00Z</date>
  </refentryinfo>
 
  <refmeta>
@@ -42,6 +36,15 @@
    by apt to authenticate packages.  Packages which have been
    authenticated using these keys will be considered trusted.
    </para>
+   <para>
+   Note that if usage of <command>apt-key</command> is desired the additional
+   installation of the GNU Privacy Guard suite (packaged in
+   <package>gnupg</package>) is required. For this reason alone the programatic
+   usage (especially in package maintainerscripts!) is strongly discouraged.
+   Further more the output format of all commands is undefined and can and does
+   change whenever the underlying commands change. <command>apt-key</command> will
+   try to detect such usage and generates warnings on stderr in these cases.
+   </para>
 </refsect1>
 
 <refsect1><title>Commands</title>
@@ -54,7 +57,17 @@
        &synopsis-param-filename; or if the filename is <literal>-</literal>
        from standard input.
      </para>
-
+     <para>
+     It is critical that keys added manually via <command>apt-key</command> are
+     verified to belong to the owner of the repositories they claim to be for
+     otherwise the &apt-secure; infrastructure is completely undermined.
+     </para>
+     <para>
+       Instead of using this command a keyring can be placed directly in the
+       <filename>/etc/apt/trusted.gpg.d/</filename> directory with a descriptive name
+       (same rules for filename apply as for &apt-conf; files) and "<literal>gpg</literal>"
+       as file extension.
+     </para>
      </listitem>
      </varlistentry>
 
@@ -91,35 +104,25 @@
      </listitem>
      </varlistentry>
 
-     <varlistentry><term><option>list</option></term>
+     <varlistentry><term><option>list</option>, <option>finger</option></term>
      <listitem>
      <para>
 
-       List trusted keys.
+       List trusted keys with fingerprints.
 
      </para>
 
      </listitem>
      </varlistentry>
-     
-     <varlistentry><term><option>finger</option></term>
-     <listitem>
-     <para>
-
-     List fingerprints of trusted keys.
-
-     </para>
 
-     </listitem>
-     </varlistentry>
-     
      <varlistentry><term><option>adv</option></term>
      <listitem>
      <para>
-
-     Pass advanced options to gpg. With adv --recv-key you can download the 
-        public key.  
-
+     Pass advanced options to gpg. With <command>adv --recv-key</command> you
+     can e.g. download key from keyservers directly into the the trusted set of
+     keys. Note that there are <emphasis>no</emphasis> checks performed, so it is
+     easy to completely undermine the &apt-secure; infrastructure if used without
+     care.
      </para>
 
      </listitem>