===== Host에서 LFS 디렉토리로 chroot =====
6장 완료후 책의 끝까지 유용하게 사용하는 스크립트

**사용법:** \\
auto-lfs s : chroot 실행, 필요한 시스템 디렉토리 마운트 \\
auto-lfs c : chroot 종료후 불필요한 시스템 디렉토리 마운트 해제 \\

<WRAP center round tip 90%>
LFS, LFS_PART와 /boot, /boot/efi, /home, /sources 등은 상황에 맞게 조정이 필요합니다.
</WRAP>

<code lang=bash>
#!/bin/bash
# LFS 12.1-systemd에 맞춤
# <7.2 소유자 변경> 이후에 사용
# 커널 가상 파일 마운트/언마운트 지원용 스크립트
# Begin ~/bin/lfs-env-config

VERSION=0.1.7
LFS=/mnt/lfs
LFS_PART=/dev/nvme0n1p8
LFS_BOOT=/dev/nvme0n1p6
LFS_EFI=/dev/nvme0n1p2
LFS_HOME=/dev/nvme0n1p7

# 필요한 별도의 파티션 마운트
if ! mountpoint -q $LFS;          then mount $LFS_PART $LFS; fi
if ! mountpoint -q $LFS/boot;     then mount $LFS_BOOT $LFS/boot; fi
if ! mountpoint -q $LFS/boot/efi; then mount $LFS_EFI $LFS/boot/efi; fi
if ! mountpoint -q $LFS/home;     then mount $LFS_HOME $LFS/home; fi
if ! mountpoint -q $LFS/sources;  then mount /mnt/nfs/sources $LFS/sources; fi

# /dev 존재 확인 후 필요한 조치 진행
if [ ! -d $LFS/dev ]; then
        echo "Make necessary directories"
        mkdir -pv $LFS/{dev,proc,sys,run}
else
        echo "All required directories have been verified."
fi

# 입력에 따라 chroot 실행 또는 exit 후 사용한 커널 가상 파일 시스템 언마운트
case $1 in
    clean|c|-c)
        if mountpoint -q $LFS/dev/shm; then
            # Unmount Kernel Virtual File System used in previous LFS sessions.
            echo "LFS is now set to '"$LFS"'"
            echo "Now proceed with the unmount of <Kernel Virtual File System> for chroot"
            for kvfs in dev/shm dev/pts sys proc run dev ; do
                    if mountpoint $LFS/$kvfs; then umount -q $LFS/$kvfs; fi
            done
            findmnt -D -R $LFS 
            echo "Ok unmount unnecessary devices"
            echo "Good bye"
            exit 0
        else
            echo "Cleanup of Kernel Virtual File System is Complete."
            findmnt -D -R $LFS
            exit 0
        fi
    ;;
    start|s|-s)
        # Mount the Kernel Virtual File System to Enter LFS chroot environment.
        echo "Now proceed with the mount of <Kernel Virtual File System> for chroot"
        echo "LFS is now set to '"$LFS"'"
        if ! mountpoint -q $LFS/dev;     then mount --bind /dev $LFS/dev;                             fi
        if ! mountpoint -q $LFS/dev/pts; then mount -t devpts devpts -o gid=5,mode=0620 $LFS/dev/pts; fi
        if ! mountpoint -q $LFS/proc;    then mount -t proc proc $LFS/proc;                           fi
        if ! mountpoint -q $LFS/sys;     then mount -t sysfs sysfs $LFS/sys;                          fi
        if ! mountpoint -q $LFS/run;     then mount -t tmpfs tmpfs $LFS/run;                          fi
        if ! mountpoint -q $LFS/dev/shm; then mount -t tmpfs -o nosuid,nodev tmpfs $LFS/dev/shm;      fi
        if ! mountpoint -q $LFS/sources; then mount --rbind /mnt/nfs/sources $LFS/sources;            fi
        findmnt -D -R $LFS
        # Run 'chroot'
        chroot "$LFS" $(type -p env) -i \
            HOME=/root                  \
            TERM="$TERM"                \
            PS1='<LFS> \u@\h [ \w ] \$ '\
            PATH=/usr/bin:/usr/sbin     \
            MAKEFLAGS="-j$(nproc)"      \
            TESTSUITEFLAGS="-j$(nproc)" \
            NINJAJOBS="$(nproc)"        \
            /bin/bash --login
        exit 0
    ;;
    version|v|-v)
        echo "LFS chroot script $VERSION"
        exit 0
    ;;
    help|h|-h)
        echo "LFS chroot script $VERSION"
        echo "Usage:"
        echo "clean   or c- Unmount Kernel Virtual File System"
        echo "start   or s- Mount and run 'chroot' command with necessary variables"
        echo "version or v- Print script version"
        echo "help    or h - This screen"
        exit 0
    ;;
    *)
        #Guidance on the factors needed to execute script
        echo "sh ./lfs-env-config [ start | clean | help | version ]"
        exit 0
    ;;
esac
## End ~/bin/lfs-env-config
</code> \\ \\
===== 파일 다운로드 링크 처리 =====

다음과 같이 등록하고 사용해야 ''cd'' 가 작동을 합니다.

<code lang=bash>
alias <filename>='source <filename>'
</code>

다운로드 링크 입력: 다운로드 -> 압축 해제 -> 디렉토리 이동

추가한 사항
  - 입력받은 URL이 Git인 경우 처리 추가
  - 확장자가 .zip인 경우 처리 추가
  - 이미 다운로드 완료한 파일의 경우 처리 추가
  - 작업 디렉토리의 소유권 확인 추가
  - 출력 색상 변수 설정

추가할 사항
  - alias 등록 확인
  - wget, git, gawk 설치 여부 확인

수정할 사항
  - git clone 사용 할 때 작업 디렉터리에 먼저 받고 source 디렉터리에 복사하는 방식으로 변경 필요.


<code user=user host=host lang=bash>
user@host:[ ~ ] $ pre-stage  https://xorg.freedesktop.org/archive/individual/proto/xcb-proto-1.17.0.tar.xz
xcb-proto-1.17.0.tar 100% [====================================================>]  148.19K  302.76KB/s
                          [Files: 1  Bytes: 148.19K [153.40KB/s] Redirects: 0  Todo: 0  Errors: 0    ]
user@host:[ /workbench/xcb-proto-1.17.0 ] $ _</code>
<code lang=bash>
#!/bin/bash

Green='\033[0;32m'
BIGreen='\033[1;32m'
Red='\033[0;31m'
Yellow='\033[0;33m'
Color_Off='\033[0m'

if [ "$(type -t p4c)" != 'alias' ] ; then
        echo -e "p4c is not ${Yellow}alias registered${Color_Off}, so the functionality is not available."
        source ${HOME}/.bash_aliases
        return 2>&/dev/null
fi

if [ -z "$1" ]; then echo -e "${Green}An appropriate factor (file name or download link) is required.${Color_Off}"; return; fi
InputStringType=$(echo "$1" | awk 'BEGIN { FS = ":" } ; { print $1 }')
BuildBase="$LFS"/workbench
SourceBase="$LFS"/sources
TargetFile=$(basename "$1")
GitDirCheck=$(basename -s .git "$1")
GitCheck=${TargetFile: -3}
ZipCheck=${TargetFile: -3}
TargetDir=$(echo "$TargetFile" | sed -e 's/\.tar.*$//' -e 's/\.tgz*$//' -e 's/\.src*$//' -e 's/\.zip*$//' -e 's@^.*/@@')
NotFoundMsg1="The directory derived from the filename is ${BIGreen}$TargetDir${Color_Off}.\n\
However, it does not exist, so it will move to the ${Yellow}most recent directory created${Color_Off}.\n\
Please check if it is correct."

if [ $(stat -c %u $BuildBase) -ne $(id -u) ] ; then echo -e "Check ${Red}$BuildBase${Color_Off} Ownership"; return; fi

function chg_dir() {
    if [ -d "$1" ]; then 
        cd "$1"
        else 
                cd $(ls -tcA -w1 | head -n1)
                echo -e "$NotFoundMsg1"
        fi
}

# Change directory "$BuildBase"
if [ "$PWD" != "$BuildBase" ]; then 
        chg_dir "$BuildBase"
fi

## Handling Git
if [ "$GitCheck" == "git" ] ; then 
        if [ -d "$GitdirCheck" ] ; then
        chg_dir "$GitDirCheck"
                return 
        else
            pushd $SourceBase
            if [ -d $GitDirCheck ] ; then
                rm -rf $GitDirCheck
            fi
            git clone "$1"
            cp -R $GitDirCheck $BuildBase
            popd
#        echo "Git #1"
        chg_dir "$GitDirCheck"
        return
    fi
fi

case "$InputStringType" in
        https|http|ftp)
            wget --no-verbose -nc --directory-prefix="$SourceBase" "$1"
        ;;
        *)
        ;;
esac

# Prepare Package Build
if [ "$ZipCheck" == "zip" ] ; then
        mkdir -p "$TargetDir"
        chg_dir "$TargetDir"
        unzip -q "$SourceBase"/"$TargetFile"
        return
else
        if [ ! -d "$TargetDir" ]; then 
                tar -xf "$SourceBase"/"$TargetFile" 2>/dev/null
        fi
        chg_dir "$TargetDir"

fi

unset  InputStringType BuildBase SourceBase TargetFile GitDirCheck GitCheck ZipCheck TargetDir NotFoundMsg1
</code>