View source for LFS: Setup Host System

Untuk membuat Linux sendiri menggunakan LFS, kita tetap memerlukan Host OS. Di sini saya menggunakan Ubuntu Server. Selain itu ada juga beberapa dependencies yang dibutuhkan.

= Check Dependencies =
<syntaxhighlight lang=bash>
cat > version-check.sh << "EOF"
#!/bin/bash
# A script to list version numbers of critical development tools

# If you have tools installed in other directories, adjust PATH here AND
# in ~lfs/.bashrc (section 4.4) as well.

LC_ALL=C 
PATH=/usr/bin:/bin

bail() { echo "FATAL: $1"; exit 1; }
grep --version > /dev/null 2> /dev/null || bail "grep does not work"
sed '' /dev/null || bail "sed does not work"
sort   /dev/null || bail "sort does not work"

ver_check()
{
   if ! type -p $2 &>/dev/null
   then 
     echo "ERROR: Cannot find $2 ($1)"; return 1; 
   fi
   v=$($2 --version 2>&1 | grep -E -o '[0-9]+\.[0-9\.]+[a-z]*' | head -n1)
   if printf '%s\n' $3 $v | sort --version-sort --check &>/dev/null
   then 
     printf "OK:    %-9s %-6s >= $3\n" "$1" "$v"; return 0;
   else 
     printf "ERROR: %-9s is TOO OLD ($3 or later required)\n" "$1"; 
     return 1; 
   fi
}

ver_kernel()
{
   kver=$(uname -r | grep -E -o '^[0-9\.]+')
   if printf '%s\n' $1 $kver | sort --version-sort --check &>/dev/null
   then 
     printf "OK:    Linux Kernel $kver >= $1\n"; return 0;
   else 
     printf "ERROR: Linux Kernel ($kver) is TOO OLD ($1 or later required)\n" "$kver"; 
     return 1; 
   fi
}

# Coreutils first because --version-sort needs Coreutils >= 7.0
ver_check Coreutils      sort     8.1 || bail "Coreutils too old, stop"
ver_check Bash           bash     3.2
ver_check Binutils       ld       2.13.1
ver_check Bison          bison    2.7
ver_check Diffutils      diff     2.8.1
ver_check Findutils      find     4.2.31
ver_check Gawk           gawk     4.0.1
ver_check GCC            gcc      5.2
ver_check "GCC (C++)"    g++      5.2
ver_check Grep           grep     2.5.1a
ver_check Gzip           gzip     1.3.12
ver_check M4             m4       1.4.10
ver_check Make           make     4.0
ver_check Patch          patch    2.5.4
ver_check Perl           perl     5.8.8
ver_check Python         python3  3.4
ver_check Sed            sed      4.1.5
ver_check Tar            tar      1.22
ver_check Texinfo        texi2any 5.0
ver_check Xz             xz       5.0.0
ver_kernel 5.4 

if mount | grep -q 'devpts on /dev/pts' && [ -e /dev/ptmx ]
then echo "OK:    Linux Kernel supports UNIX 98 PTY";
else echo "ERROR: Linux Kernel does NOT support UNIX 98 PTY"; fi

alias_check() {
   if $1 --version 2>&1 | grep -qi $2
   then printf "OK:    %-4s is $2\n" "$1";
   else printf "ERROR: %-4s is NOT $2\n" "$1"; fi
}
echo "Aliases:"
alias_check awk GNU
alias_check yacc Bison
alias_check sh Bash

echo "Compiler check:"
if printf "int main(){}" | g++ -x c++ -
then echo "OK:    g++ works";
else echo "ERROR: g++ does NOT work"; fi
rm -f a.out

if [ "$(nproc)" = "" ]; then
   echo "ERROR: nproc is not available or it produces empty output"
else
   echo "OK: nproc reports $(nproc) logical cores are available"
fi
EOF

$ bash version-check.sh
</syntaxhighlight>

Contoh Output: 
<syntaxhighlight lang=bash>
OK:    Coreutils 9.4    >= 8.1
OK:    Bash      5.2.21 >= 3.2
OK:    Binutils  2.42   >= 2.13.1
OK:    Bison     3.8.2  >= 2.7
OK:    Diffutils 3.10   >= 2.8.1
OK:    Findutils 4.9.0  >= 4.2.31
OK:    Gawk      5.2.1  >= 4.0.1
OK:    GCC       13.3.0 >= 5.2
OK:    GCC (C++) 13.3.0 >= 5.2
OK:    Grep      3.11   >= 2.5.1a
OK:    Gzip      1.12   >= 1.3.12
OK:    M4        1.4.19 >= 1.4.10
OK:    Make      4.3    >= 4.0
OK:    Patch     2.7.6  >= 2.5.4
OK:    Perl      5.38.2 >= 5.8.8
OK:    Python    3.12.3 >= 3.4
OK:    Sed       4.9    >= 4.1.5
OK:    Tar       1.35   >= 1.22
OK:    Texinfo   7.1    >= 5.0
OK:    Xz        5.4.5  >= 5.0.0
OK:    Linux Kernel 6.8.0 >= 5.4
OK:    Linux Kernel supports UNIX 98 PTY
Aliases:
OK:    awk  is GNU
OK:    yacc is Bison
ERROR: sh   is NOT Bash
Compiler check:
OK:    g++ works
OK: nproc reports 1 logical cores are available
</syntaxhighlight>

Kalau ada yang error silahkan diinstall. Contoh dalam kasus saya:
<syntaxhighlight lang=bash>
sudo apt update && sudo apt install -y \
binutils \
bison \
gcc \
g++ \
m4 \
make \
texinfo \
bison \
bash
</syntaxhighlight>