Avoid using fakeroot for rebuilding packages

For parallel builds, fakeroot limits actual concurrency a lot.  In
other cases it's still an unnecessary complication that slows things
down.

- Where appropriate, use dpkg-buildpackage instead.
- Otherwise, since src:linux has had "Rules-Requires-Root: no" since
  before buster, use DEB_RULES_REQUIRES_ROOT=no instead.  (Without
  either this or fakeroot, some debhelper commands would complain.)
- Remove fakeroot from lists of packages to be installed.

chapter-common-tasks.dbk

@@ -278,7 +278,7 @@ Run the following commands:
 </para>
 <variablelist>
 <varlistentry>
-<term><prompt>#</prompt> <userinput>apt-get install build-essential fakeroot</userinput></term>
+<term><prompt>#</prompt> <userinput>apt-get install build-essential</userinput></term>
 <term><prompt>#</prompt> <userinput>apt-get build-dep linux</userinput></term>
 <listitem>
 <para>
@@ -437,7 +437,7 @@ To change the configuration before building, for example for the 686-pae
 flavour on i386, run the commands:
 </para>
 <screen>
-<prompt>$</prompt> <userinput>fakeroot make -f debian/rules.gen setup_i386_none_686-pae</userinput>
+<prompt>$</prompt> <userinput>make -f debian/rules.gen setup_i386_none_686-pae</userinput>
 <prompt>$</prompt> <userinput>make -C debian/build/build_i386_none_686-pae nconfig</userinput>
 </screen>
 </section>
@@ -447,19 +447,19 @@ flavour on i386, run the commands:
 To build all possible packages for this architecture, run:
 </para>
 <screen>
-<prompt>$</prompt> <userinput>fakeroot debian/rules binary</userinput>
+<prompt>$</prompt> <userinput>dpkg-buildpackage -b -nc -uc</userinput>
 </screen>
 <para>
 To build all architecture-dependent packages, run:
 </para>
 <screen>
-<prompt>$</prompt> <userinput>fakeroot debian/rules binary-arch</userinput>
+<prompt>$</prompt> <userinput>dpkg-buildpackage -B -nc -uc</userinput>
 </screen>
 <para>
 To build all architecture-independent packages, run:
 </para>
 <screen>
-<prompt>$</prompt> <userinput>fakeroot debian/rules binary-indep</userinput>
+<prompt>$</prompt> <userinput>dpkg-buildpackage -A -nc -uc</userinput>
 </screen>
 </section>
 
@@ -469,8 +469,8 @@ For example, to build only the binary packages for 686-pae flavour on i386
 architecture, use the following commands:
 </para>
 <screen>
-<prompt>$</prompt> <userinput>fakeroot debian/rules source</userinput>
-<prompt>$</prompt> <userinput>fakeroot make -f debian/rules.gen binary-arch_i386_none_686-pae</userinput>
+<prompt>$</prompt> <userinput>debian/rules source</userinput>
+<prompt>$</prompt> <userinput>DEB_RULES_REQUIRES_ROOT=no make -f debian/rules.gen binary-arch_i386_none_686-pae</userinput>
 </screen>
 <para>
 The target in this command has the general form of
@@ -482,8 +482,8 @@ need the <package>linux-headers-<replaceable>version</replaceable>-common</packa
 binary package, which can be built using the commands:
 </para>
 <screen>
-<prompt>$</prompt> <userinput>fakeroot debian/rules source</userinput>
-<prompt>$</prompt> <userinput>fakeroot make -f debian/rules.gen binary-arch_i386_none_real</userinput>
+<prompt>$</prompt> <userinput>debian/rules source</userinput>
+<prompt>$</prompt> <userinput>DEB_RULES_REQUIRES_ROOT=no make -f debian/rules.gen binary-arch_i386_none_real</userinput>
 </screen>
 <para>
 The target in this command has the general form of
@@ -500,7 +500,7 @@ version:
 </para>
 <variablelist>
 <varlistentry>
-<term><prompt>#</prompt> <userinput>apt-get install build-essential fakeroot rsync git</userinput></term>
+<term><prompt>#</prompt> <userinput>apt-get install build-essential rsync git</userinput></term>
 <term><prompt>#</prompt> <userinput>apt-get build-dep linux</userinput></term>
 <listitem>
 <para>
@@ -551,7 +551,7 @@ of the various kernel flavours which can be built.
 </listitem>
 </varlistentry>
 <varlistentry>
-<term><prompt>$</prompt> <userinput>fakeroot debian/rules <replaceable>target</replaceable></userinput></term>
+<term><prompt>$</prompt> <userinput>DEB_RULES_REQUIRES_ROOT=no debian/rules <replaceable>target</replaceable></userinput></term>
 <listitem>
 <para>
 Finally, build binary packages as explained in <xref

chapter-versions.dbk

@@ -120,7 +120,7 @@ If the kernel ABI has changed you must then change the ABI name in
 <filename>debian/config/defines</filename>.  Then run the command
 </para>
 <screen>
-<prompt>$</prompt> <userinput>fakeroot debian/rules debian/control-real</userinput>
+<prompt>$</prompt> <userinput>debian/rules debian/control-real</userinput>
 </screen>
 <para>
 to regenerate the package definitions for this ABI name.

debian/changelog

@@ -6,6 +6,7 @@ kernel-handbook (1.0.21) UNRELEASED; urgency=medium
     - Deprecate older versions of test-patches
     - Recommend changing ABI name before rebuilding
     - Add command to enable parallel builds when invoking make directly
+    - Avoid using fakeroot
   * Remove obsolete text referring to "patchlevels" in source packages
   * Remove redundant "bash" from debian/bin/test-patches command lines
   * Update instructions for disabling debug info (Closes: #1023773)

po4a/kernel-handbook.ja.po

@@ -1704,8 +1704,8 @@ msgstr ""
 #. type: Content of: <chapter><section><section><screen>
 #: chapter-versions.dbk:112
 #, no-wrap
-msgid "<prompt>$</prompt> <userinput>fakeroot debian/rules debian/control-real</userinput>\n"
-msgstr "<prompt>$</prompt> <userinput>fakeroot debian/rules debian/control-real</userinput>\n"
+msgid "<prompt>$</prompt> <userinput>debian/rules debian/control-real</userinput>\n"
+msgstr "<prompt>$</prompt> <userinput>debian/rules debian/control-real</userinput>\n"
 
 #. type: Content of: <chapter><section><section><para>
 #: chapter-versions.dbk:115
@@ -1908,11 +1908,9 @@ msgstr "次のコマンドを実行します:"
 #. type: Content of: <chapter><section><section><variablelist><varlistentry><term>
 #: chapter-common-tasks.dbk:34
 msgid ""
-"<prompt>#</prompt> <userinput>apt-get install build-essential fakeroot</"
-"userinput>"
+"<prompt>#</prompt> <userinput>apt-get install build-essential</userinput>"
 msgstr ""
-"<prompt>#</prompt> <userinput>apt-get install build-essential fakeroot</"
-"userinput>"
+"<prompt>#</prompt> <userinput>apt-get install build-essential</userinput>"
 
 #. type: Content of: <chapter><section><variablelist><varlistentry><term>
 #: chapter-common-tasks.dbk:35 chapter-common-tasks.dbk:221
@@ -2133,10 +2131,10 @@ msgstr ""
 #: chapter-common-tasks.dbk:153
 #, no-wrap
 msgid ""
-"<prompt>$</prompt> <userinput>fakeroot make -f debian/rules.gen setup_i386_none_686-pae</userinput>\n"
+"<prompt>$</prompt> <userinput>make -f debian/rules.gen setup_i386_none_686-pae</userinput>\n"
 "<prompt>$</prompt> <userinput>make -C debian/build/build_i386_none_686-pae nconfig</userinput>\n"
 msgstr ""
-"<prompt>$</prompt> <userinput>fakeroot make -f debian/rules.gen setup_i386_none_686-pae</userinput>\n"
+"<prompt>$</prompt> <userinput>make -f debian/rules.gen setup_i386_none_686-pae</userinput>\n"
 "<prompt>$</prompt> <userinput>make -C debian/build/build_i386_none_686-pae nconfig</userinput>\n"
 
 #. type: Content of: <chapter><section><section><para>
@@ -2164,8 +2162,8 @@ msgstr ""
 #. type: Content of: <chapter><section><section><screen>
 #: chapter-common-tasks.dbk:167
 #, no-wrap
-msgid "<prompt>$</prompt> <userinput>fakeroot debian/rules binary</userinput>\n"
-msgstr "<prompt>$</prompt> <userinput>fakeroot debian/rules binary</userinput>\n"
+msgid "<prompt>$</prompt> <userinput>dpkg-buildpackage -b -nc -uc</userinput>\n"
+msgstr "<prompt>$</prompt> <userinput>dpkg-buildpackage -b -nc -uc</userinput>\n"
 
 #. type: Content of: <chapter><section><section><para>
 #: chapter-common-tasks.dbk:170
@@ -2177,8 +2175,8 @@ msgstr ""
 #. type: Content of: <chapter><section><section><screen>
 #: chapter-common-tasks.dbk:173
 #, no-wrap
-msgid "<prompt>$</prompt> <userinput>fakeroot debian/rules binary-arch</userinput>\n"
-msgstr "<prompt>$</prompt> <userinput>fakeroot debian/rules binary-arch</userinput>\n"
+msgid "<prompt>$</prompt> <userinput>dpkg-buildpackage -B -nc -uc</userinput>\n"
+msgstr "<prompt>$</prompt> <userinput>dpkg-buildpackage -B -nc -uc</userinput>\n"
 
 #. type: Content of: <chapter><section><section><para>
 #: chapter-common-tasks.dbk:176
@@ -2190,8 +2188,8 @@ msgstr ""
 #. type: Content of: <chapter><section><section><screen>
 #: chapter-common-tasks.dbk:179
 #, no-wrap
-msgid "<prompt>$</prompt> <userinput>fakeroot debian/rules binary-indep</userinput>\n"
-msgstr "<prompt>$</prompt> <userinput>fakeroot debian/rules binary-indep</userinput>\n"
+msgid "<prompt>$</prompt> <userinput>dpkg-buildpackage -A -nc -uc</userinput>\n"
+msgstr "<prompt>$</prompt> <userinput>dpkg-buildpackage -A -nc -uc</userinput>\n"
 
 #. type: Content of: <chapter><section><section><title>
 #: chapter-common-tasks.dbk:183
@@ -2211,11 +2209,11 @@ msgstr ""
 #: chapter-common-tasks.dbk:189
 #, no-wrap
 msgid ""
-"<prompt>$</prompt> <userinput>fakeroot debian/rules source</userinput>\n"
-"<prompt>$</prompt> <userinput>fakeroot make -f debian/rules.gen binary-arch_i386_none_686-pae</userinput>\n"
+"<prompt>$</prompt> <userinput>debian/rules source</userinput>\n"
+"<prompt>$</prompt> <userinput>DEB_RULES_REQUIRES_ROOT=no make -f debian/rules.gen binary-arch_i386_none_686-pae</userinput>\n"
 msgstr ""
-"<prompt>$</prompt> <userinput>fakeroot debian/rules source</userinput>\n"
-"<prompt>$</prompt> <userinput>fakeroot make -f debian/rules.gen binary-arch_i386_none_686-pae</userinput>\n"
+"<prompt>$</prompt> <userinput>debian/rules source</userinput>\n"
+"<prompt>$</prompt> <userinput>DEB_RULES_REQUIRES_ROOT=no make -f debian/rules.gen binary-arch_i386_none_686-pae</userinput>\n"
 
 #. type: Content of: <chapter><section><section><para>
 #: chapter-common-tasks.dbk:193
@@ -2244,11 +2242,11 @@ msgstr ""
 #: chapter-common-tasks.dbk:202
 #, no-wrap
 msgid ""
-"<prompt>$</prompt> <userinput>fakeroot debian/rules source</userinput>\n"
-"<prompt>$</prompt> <userinput>fakeroot make -f debian/rules.gen binary-arch_i386_none_real</userinput>\n"
+"<prompt>$</prompt> <userinput>debian/rules source</userinput>\n"
+"<prompt>$</prompt> <userinput>DEB_RULES_REQUIRES_ROOT=no make -f debian/rules.gen binary-arch_i386_none_real</userinput>\n"
 msgstr ""
-"<prompt>$</prompt> <userinput>fakeroot debian/rules source</userinput>\n"
-"<prompt>$</prompt> <userinput>fakeroot make -f debian/rules.gen binary-arch_i386_none_real</userinput>\n"
+"<prompt>$</prompt> <userinput>debian/rules source</userinput>\n"
+"<prompt>$</prompt> <userinput>DEB_RULES_REQUIRES_ROOT=no make -f debian/rules.gen binary-arch_i386_none_real</userinput>\n"
 
 #. type: Content of: <chapter><section><section><para>
 #: chapter-common-tasks.dbk:206
@@ -2280,10 +2278,10 @@ msgstr ""
 #. type: Content of: <chapter><section><variablelist><varlistentry><term>
 #: chapter-common-tasks.dbk:220
 msgid ""
-"<prompt>#</prompt> <userinput>apt-get install build-essential fakeroot rsync "
+"<prompt>#</prompt> <userinput>apt-get install build-essential rsync "
 "git</userinput>"
 msgstr ""
-"<prompt>#</prompt> <userinput>apt-get install build-essential fakeroot rsync "
+"<prompt>#</prompt> <userinput>apt-get install build-essential rsync "
 "git</userinput>"
 
 #. type: Content of: <chapter><section><variablelist><varlistentry><listitem><para>
@@ -2372,10 +2370,10 @@ msgstr ""
 #. type: Content of: <chapter><section><variablelist><varlistentry><term>
 #: chapter-common-tasks.dbk:271
 msgid ""
-"<prompt>$</prompt> <userinput>fakeroot debian/rules <replaceable>target</"
+"<prompt>$</prompt> <userinput>DEB_RULES_REQUIRES_ROOT=no debian/rules <replaceable>target</"
 "replaceable></userinput>"
 msgstr ""
-"<prompt>$</prompt> <userinput>fakeroot debian/rules <replaceable>target</"
+"<prompt>$</prompt> <userinput>DEB_RULES_REQUIRES_ROOT=no debian/rules <replaceable>target</"
 "replaceable></userinput>"
 
 #. type: Content of: <chapter><section><variablelist><varlistentry><listitem><para>