[673b0d8] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[b06ca36] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[673b0d8] | 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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[8ef8304] | 7 |
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[673b0d8] | 8 | <sect1 id="ch-system-createfiles">
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[8ef8304] | 9 | <?dbhtml filename="createfiles.html"?>
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| 10 |
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[d2c332bc] | 11 | <title>Creating Essential Files and Symlinks</title>
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| 12 |
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| 13 | <indexterm zone="ch-system-createfiles">
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| 14 | <primary sortas="e-/etc/passwd">/etc/passwd</primary>
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| 15 | </indexterm>
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| 16 |
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| 17 | <indexterm zone="ch-system-createfiles">
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| 18 | <primary sortas="e-/etc/group">/etc/group</primary>
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| 19 | </indexterm>
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| 20 |
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| 21 | <indexterm zone="ch-system-createfiles">
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| 22 | <primary sortas="e-/var/run/utmp">/var/run/utmp</primary>
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| 23 | </indexterm>
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| 24 |
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| 25 | <indexterm zone="ch-system-createfiles">
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| 26 | <primary sortas="e-/var/log/btmp">/var/log/btmp</primary>
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| 27 | </indexterm>
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| 28 |
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| 29 | <indexterm zone="ch-system-createfiles">
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| 30 | <primary sortas="e-/var/log/lastlog">/var/log/lastlog</primary>
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| 31 | </indexterm>
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| 32 |
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| 33 | <indexterm zone="ch-system-createfiles">
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| 34 | <primary sortas="e-/var/log/wtmp">/var/log/wtmp</primary>
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| 35 | </indexterm>
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[673b0d8] | 36 |
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[d1a862d7] | 37 | <para>Some programs use hard-wired paths to programs which do not exist yet.
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| 38 | In order to satisfy these programs, create a number of symbolic links which
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| 39 | will be replaced by real files throughout the course of this chapter after the
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| 40 | software has been installed:</para>
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[673b0d8] | 41 |
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[75828c3] | 42 | <screen><userinput>ln -sv /tools/bin/{bash,cat,chmod,dd,echo,ln,mkdir,pwd,rm,stty,touch} /bin
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[d89628d] | 43 | ln -sv /tools/bin/{env,install,perl,printf} /usr/bin
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[6c67242] | 44 | ln -sv /tools/lib/libgcc_s.so{,.1} /usr/lib
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| 45 | ln -sv /tools/lib/libstdc++.{a,so{,.6}} /usr/lib
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[effe07a] | 46 | ln -sv /tools/lib/libfl.so* /usr/lib
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[8054162] | 47 |
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[effe07a] | 48 | ln -sv bash /bin/sh
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[a91de2aa] | 49 |
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[effe07a] | 50 | for lib in blkid mount uuid fdisk
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[d1a862d7] | 51 | do
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[3f60e0c] | 52 | ln -sv /tools/lib/lib$lib.so* /usr/lib
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[effe07a] | 53 | sed 's|/tools|/usr|' /tools/lib/pkgconfig/${lib}.pc \
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| 54 | > /usr/lib/pkgconfig/${lib}.pc
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| 55 | done
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| 56 | for incdir in blkid libmount uuid libfdisk
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[f1e1fe6] | 57 | do
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[effe07a] | 58 | ln -svf /tools/include/$incdir /usr/include
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[59b66d7] | 59 | done
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| 60 |
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| 61 | mkdir -pv /tools/lib/locale
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| 62 | ln -sv /usr/lib/locale/locale-archive /tools/lib/locale</userinput></screen>
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[effe07a] | 63 |
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[448e226] | 64 | <variablelist>
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| 65 | <title>The purpose of each link:</title>
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| 66 |
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| 67 | <varlistentry>
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| 68 | <term><parameter><filename>/bin/bash</filename></parameter></term>
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| 69 | <listitem>
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| 70 | <para>Many <command>bash</command> scripts specify
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| 71 | <filename>/bin/bash</filename>.</para>
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| 72 | </listitem>
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| 73 | </varlistentry>
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| 74 |
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| 75 | <varlistentry>
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| 76 | <term><parameter><filename>/bin/cat</filename></parameter></term>
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| 77 | <listitem>
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| 78 | <para>This pathname is hard-coded into Glibc's configure script.</para>
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| 79 | </listitem>
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| 80 | </varlistentry>
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| 81 |
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[d1a862d7] | 82 | <varlistentry>
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| 83 | <term><parameter><filename>/bin/dd</filename></parameter></term>
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| 84 | <listitem>
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| 85 | <para>The path to <filename>dd</filename> will be hard-coded into the
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| 86 | <filename>/usr/bin/libtool</filename> utility.</para>
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| 87 | </listitem>
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| 88 | </varlistentry>
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| 89 |
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[448e226] | 90 | <varlistentry>
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| 91 | <term><parameter><filename>/bin/echo</filename></parameter></term>
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| 92 | <listitem>
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| 93 | <para>This is to satisfy one of the tests in Glibc's test suite, which
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| 94 | expects <filename>/bin/echo</filename>.</para>
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| 95 | </listitem>
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| 96 | </varlistentry>
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| 97 |
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[6c67242] | 98 | <varlistentry>
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| 99 | <term><parameter><filename>/usr/bin/env</filename></parameter></term>
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| 100 | <listitem>
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| 101 | <para>This pathname is hard-coded into some packages build procedures.
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| 102 | <!-- systemd This may not be needed if we move sysd to the end--></para>
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| 103 | </listitem>
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| 104 | </varlistentry>
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| 105 |
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[d1a862d7] | 106 | <varlistentry>
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| 107 | <term><parameter><filename>/usr/bin/install</filename></parameter></term>
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| 108 | <listitem>
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| 109 | <para>The path to <filename>install</filename> will be hard-coded into
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| 110 | the <filename>/usr/lib/bash/Makefile.inc</filename> file.</para>
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| 111 | </listitem>
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| 112 | </varlistentry>
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| 113 |
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| 114 | <varlistentry>
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| 115 | <term><parameter><filename>/bin/ln</filename></parameter></term>
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| 116 | <listitem>
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| 117 | <para>The path to <filename>ln</filename> will be hard-coded into the
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| 118 | <filename>/usr/lib/perl5/&perl-version;/<target-triplet>/Config_heavy.pl</filename>
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| 119 | file.</para>
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| 120 | </listitem>
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| 121 | </varlistentry>
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| 122 |
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[448e226] | 123 | <varlistentry>
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| 124 | <term><parameter><filename>/bin/pwd</filename></parameter></term>
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| 125 | <listitem>
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| 126 | <para>Some <command>configure</command> scripts, particularly Glibc's,
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| 127 | have this pathname hard-coded.</para>
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| 128 | </listitem>
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| 129 | </varlistentry>
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| 130 |
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[d1a862d7] | 131 | <varlistentry>
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| 132 | <term><parameter><filename>/bin/rm</filename></parameter></term>
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| 133 | <listitem>
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| 134 | <para>The path to <filename>rm</filename> will be hard-coded into the
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| 135 | <filename>/usr/lib/perl5/&perl-version;/<target-triplet>/Config_heavy.pl</filename>
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| 136 | file.</para>
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| 137 | </listitem>
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| 138 | </varlistentry>
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| 139 |
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[448e226] | 140 | <varlistentry>
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| 141 | <term><parameter><filename>/bin/stty</filename></parameter></term>
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| 142 | <listitem>
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| 143 | <para>This pathname is hard-coded into Expect, therefore it is needed
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| 144 | for Binutils and GCC test suites to pass.</para>
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| 145 | </listitem>
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| 146 | </varlistentry>
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| 147 |
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| 148 | <varlistentry>
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| 149 | <term><parameter><filename>/usr/bin/perl</filename></parameter></term>
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| 150 | <listitem>
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| 151 | <para>Many Perl scripts hard-code this path to the
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| 152 | <command>perl</command> program.</para>
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| 153 | </listitem>
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| 154 | </varlistentry>
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| 155 |
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| 156 | <varlistentry>
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| 157 | <term><parameter><filename>/usr/lib/libgcc_s.so{,.1}</filename></parameter></term>
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| 158 | <listitem>
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| 159 | <para>Glibc needs this for the pthreads library to work.</para>
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| 160 | </listitem>
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| 161 | </varlistentry>
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| 162 |
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| 163 | <varlistentry>
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| 164 | <term><parameter><filename>/usr/lib/libstdc++{,.6}</filename></parameter></term>
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| 165 | <listitem>
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| 166 | <para>This is needed by several tests in Glibc's test suite, as well as
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| 167 | for C++ support in GMP.</para>
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| 168 | </listitem>
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| 169 | </varlistentry>
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[effe07a] | 170 |
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[448e226] | 171 | <varlistentry>
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[effe07a] | 172 | <term><parameter><filename>/bin/sh</filename></parameter></term>
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[448e226] | 173 | <listitem>
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[effe07a] | 174 | <para>Many shell scripts hard-code <filename>/bin/sh</filename>.</para>
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[448e226] | 175 | </listitem>
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| 176 | </varlistentry>
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[effe07a] | 177 |
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| 178 | <varlistentry>
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| 179 | <term>
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| 180 | <parameter><filename>/usr/lib/libfl.so*</filename></parameter>
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| 181 | </term>
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[d1a862d7] | 182 | <listitem>
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[effe07a] | 183 | <para>This link allows binutils to find the flex library, and to
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| 184 | build enhanced versions of ar and ranlib.</para>
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[d1a862d7] | 185 | </listitem>
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[effe07a] | 186 | </varlistentry>
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[d1a862d7] | 187 |
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[448e226] | 188 | <varlistentry>
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[effe07a] | 189 | <term>
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| 190 | <parameter>
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| 191 | <filename>/usr/lib/lib{blkid,fdisk,mount,uuid}.so*</filename>,
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| 192 | <filename>/usr/include/{blkid,libfdisk,libmount,uuid}</filename>,
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| 193 | <filename>/usr/lib/pkgconfig/{blkid,fdisk,mount,uuid}.pc</filename>
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| 194 | </parameter>
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| 195 | </term>
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| 196 | <listitem>
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| 197 | <para>These links and files allow
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| 198 | <phrase revision="sysv">eudev</phrase>
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| 199 | <phrase revision="systemd">systemd</phrase> to find the
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| 200 | util-linux libraries installed in chapter 5, without creating
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| 201 | wrong references to /tools. The uuid library is also needed for
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| 202 | building a python module.</para>
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[448e226] | 203 | </listitem>
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| 204 | </varlistentry>
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| 205 |
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[59b66d7] | 206 | <varlistentry>
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| 207 | <term>
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| 208 | <parameter>
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| 209 | <filename>/tools/lib/locale/locale-archive</filename>
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| 210 | </parameter>
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| 211 | </term>
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| 212 | <listitem>
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| 213 | <para>Some programs built in chapter 5 look for installed
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| 214 | locale descriptions in this file. The locale descriptions will be
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| 215 | installed in <filename>/usr/lib/locale/locale-archive</filename>
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| 216 | after building the final glibc. The symlink allows those programs
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| 217 | to use the installed locales.</para>
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| 218 | </listitem>
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| 219 | </varlistentry>
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| 220 |
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[448e226] | 221 | </variablelist>
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| 222 |
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[85e7f3c] | 223 | <para>Historically, Linux maintains a list of the mounted file systems in the
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[ba8848f] | 224 | file <filename>/etc/mtab</filename>. Modern kernels maintain this list
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[85e7f3c] | 225 | internally and exposes it to the user via the <filename
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[ba8848f] | 226 | class="directory">/proc</filename> filesystem. To satisfy utilities that
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[85e7f3c] | 227 | expect the presence of <filename>/etc/mtab</filename>, create the following
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| 228 | symbolic link:</para>
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| 229 |
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| 230 | <screen><userinput>ln -sv /proc/self/mounts /etc/mtab</userinput></screen>
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[d2c332bc] | 231 |
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| 232 | <para>In order for user <systemitem class="username">root</systemitem> to be
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| 233 | able to login and for the name <quote>root</quote> to be recognized, there
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| 234 | must be relevant entries in the <filename>/etc/passwd</filename> and
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| 235 | <filename>/etc/group</filename> files.</para>
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| 236 |
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| 237 | <para>Create the <filename>/etc/passwd</filename> file by running the following
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| 238 | command:</para>
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| 239 |
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[1118b17] | 240 | <screen revision="sysv"><userinput>cat > /etc/passwd << "EOF"
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[4361397] | 241 | <literal>root:x:0:0:root:/root:/bin/bash
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[8f90f47d] | 242 | bin:x:1:1:bin:/dev/null:/bin/false
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[030875a8] | 243 | daemon:x:6:6:Daemon User:/dev/null:/bin/false
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[f8fe8970] | 244 | messagebus:x:18:18:D-Bus Message Daemon User:/var/run/dbus:/bin/false
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[390e32c] | 245 | nobody:x:99:99:Unprivileged User:/dev/null:/bin/false</literal>
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[1118b17] | 246 | EOF</userinput></screen>
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| 247 |
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[cbd8bf0f] | 248 | <screen revision="systemd"><userinput>cat > /etc/passwd << "EOF"
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[1118b17] | 249 | <literal>root:x:0:0:root:/root:/bin/bash
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| 250 | bin:x:1:1:bin:/dev/null:/bin/false
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| 251 | daemon:x:6:6:Daemon User:/dev/null:/bin/false
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| 252 | messagebus:x:18:18:D-Bus Message Daemon User:/var/run/dbus:/bin/false
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| 253 | systemd-bus-proxy:x:72:72:systemd Bus Proxy:/:/bin/false
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| 254 | systemd-journal-gateway:x:73:73:systemd Journal Gateway:/:/bin/false
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| 255 | systemd-journal-remote:x:74:74:systemd Journal Remote:/:/bin/false
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| 256 | systemd-journal-upload:x:75:75:systemd Journal Upload:/:/bin/false
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| 257 | systemd-network:x:76:76:systemd Network Management:/:/bin/false
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| 258 | systemd-resolve:x:77:77:systemd Resolver:/:/bin/false
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| 259 | systemd-timesync:x:78:78:systemd Time Synchronization:/:/bin/false
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| 260 | systemd-coredump:x:79:79:systemd Core Dumper:/:/bin/false
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| 261 | nobody:x:99:99:Unprivileged User:/dev/null:/bin/false</literal>
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[d2c332bc] | 262 | EOF</userinput></screen>
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| 263 |
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| 264 | <para>The actual password for <systemitem class="username">root</systemitem>
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| 265 | (the <quote>x</quote> used here is just a placeholder) will be set later.</para>
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| 266 |
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| 267 | <para>Create the <filename>/etc/group</filename> file by running the following
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| 268 | command:</para>
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| 269 |
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[1118b17] | 270 | <screen revision="sysv"><userinput>cat > /etc/group << "EOF"
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| 271 | <literal>root:x:0:
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| 272 | bin:x:1:daemon
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| 273 | sys:x:2:
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| 274 | kmem:x:3:
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| 275 | tape:x:4:
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| 276 | tty:x:5:
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| 277 | daemon:x:6:
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| 278 | floppy:x:7:
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| 279 | disk:x:8:
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| 280 | lp:x:9:
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| 281 | dialout:x:10:
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| 282 | audio:x:11:
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| 283 | video:x:12:
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| 284 | utmp:x:13:
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| 285 | usb:x:14:
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| 286 | cdrom:x:15:
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| 287 | adm:x:16:
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| 288 | messagebus:x:18:
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| 289 | input:x:24:
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| 290 | mail:x:34:
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[e0472a1] | 291 | kvm:x:61:
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[31bf7e7] | 292 | wheel:x:97:
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[1118b17] | 293 | nogroup:x:99:
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| 294 | users:x:999:</literal>
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| 295 | EOF</userinput></screen>
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| 296 |
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| 297 | <screen revision="systemd"><userinput>cat > /etc/group << "EOF"
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[d2c332bc] | 298 | <literal>root:x:0:
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[030875a8] | 299 | bin:x:1:daemon
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[d2c332bc] | 300 | sys:x:2:
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| 301 | kmem:x:3:
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[107e7a5] | 302 | tape:x:4:
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| 303 | tty:x:5:
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[d2c332bc] | 304 | daemon:x:6:
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| 305 | floppy:x:7:
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| 306 | disk:x:8:
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| 307 | lp:x:9:
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[bb8939c] | 308 | dialout:x:10:
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[d2c332bc] | 309 | audio:x:11:
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| 310 | video:x:12:
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| 311 | utmp:x:13:
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| 312 | usb:x:14:
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[4361397] | 313 | cdrom:x:15:
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[f8fe8970] | 314 | adm:x:16:
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| 315 | messagebus:x:18:
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| 316 | systemd-journal:x:23:
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[e4429b7] | 317 | input:x:24:
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[d1538c0] | 318 | mail:x:34:
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[92c9489] | 319 | kvm:x:61:
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[1118b17] | 320 | systemd-bus-proxy:x:72:
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| 321 | systemd-journal-gateway:x:73:
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| 322 | systemd-journal-remote:x:74:
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| 323 | systemd-journal-upload:x:75:
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| 324 | systemd-network:x:76:
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| 325 | systemd-resolve:x:77:
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| 326 | systemd-timesync:x:78:
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| 327 | systemd-coredump:x:79:
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[b8cb3b3] | 328 | wheel:x:97:
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[030875a8] | 329 | nogroup:x:99:
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| 330 | users:x:999:</literal>
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[d2c332bc] | 331 | EOF</userinput></screen>
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| 332 |
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| 333 | <para>The created groups are not part of any standard—they are groups
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| 334 | decided on in part by the requirements of the Udev configuration in this
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| 335 | chapter, and in part by common convention employed by a number of existing
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[030875a8] | 336 | Linux distributions. In addition, some test suites rely on specific users
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| 337 | or groups. The Linux Standard Base (LSB, available at <ulink
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[d2c332bc] | 338 | url="http://www.linuxbase.org"/>) recommends only that, besides the group
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| 339 | <systemitem class="groupname">root</systemitem> with a Group ID (GID) of 0,
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| 340 | a group <systemitem class="groupname">bin</systemitem> with a GID of 1 be
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| 341 | present. All other group names and GIDs can be chosen freely by the system
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| 342 | administrator since well-written programs do not depend on GID numbers, but
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| 343 | rather use the group's name.</para>
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| 344 |
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[7406bec] | 345 | <para>Some tests later in the chapter need a regular user. We add this
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| 346 | user here and delete this account at the end of the chapter.</para>
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| 347 |
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[1f5a586] | 348 | <screen><userinput>echo "tester:x:101:101::/home/tester:/bin/bash" >> /etc/passwd
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| 349 | echo "tester:x:101:dummy" >> /etc/group
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| 350 | install -o tester -d /home/tester</userinput></screen>
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[7406bec] | 351 |
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[d2c332bc] | 352 | <para>To remove the <quote>I have no name!</quote> prompt, start a new
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| 353 | shell. Since a full Glibc was installed in <xref
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| 354 | linkend="chapter-temporary-tools"/> and the
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| 355 | <filename>/etc/passwd</filename> and <filename>/etc/group</filename>
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| 356 | files have been created, user name and group name resolution will now
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[f19e766] | 357 | work:</para>
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[d2c332bc] | 358 |
|
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| 359 | <screen role="nodump"><userinput>exec /tools/bin/bash --login +h</userinput></screen>
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| 360 |
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| 361 | <para>Note the use of the <parameter>+h</parameter> directive. This tells
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| 362 | <command>bash</command> not to use its internal path hashing. Without this
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| 363 | directive, <command>bash</command> would remember the paths to binaries it has
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| 364 | executed. To ensure the use of the newly compiled binaries as soon as they are
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| 365 | installed, the <parameter>+h</parameter> directive will be used for the duration
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| 366 | of this chapter.</para>
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| 367 |
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| 368 | <para>The <command>login</command>, <command>agetty</command>, and
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| 369 | <command>init</command> programs (and others) use a number of log
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| 370 | files to record information such as who was logged into the system and
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| 371 | when. However, these programs will not write to the log files if they
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| 372 | do not already exist. Initialize the log files and give them
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| 373 | proper permissions:</para>
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| 374 |
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[5bf238b] | 375 | <screen><userinput>touch /var/log/{btmp,lastlog,faillog,wtmp}
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[4f2e707] | 376 | chgrp -v utmp /var/log/lastlog
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| 377 | chmod -v 664 /var/log/lastlog
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| 378 | chmod -v 600 /var/log/btmp</userinput></screen>
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[d2c332bc] | 379 |
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[44f6add] | 380 | <para>The <filename>/var/log/wtmp</filename> file records all logins and
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| 381 | logouts. The <filename>/var/log/lastlog</filename> file records when each
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[5bf238b] | 382 | user last logged in. The <filename>/var/log/faillog</filename> file records
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| 383 | failed login attempts. The <filename>/var/log/btmp</filename> file records
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| 384 | the bad login attempts.</para>
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[44f6add] | 385 |
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| 386 | <note><para>The <filename>/run/utmp</filename> file records the users that
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| 387 | are currently logged in. This file is created dynamically in the boot
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| 388 | scripts.</para></note>
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[d2c332bc] | 389 |
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[673b0d8] | 390 | </sect1>
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