65 lines
5.3 KiB
Bash
Executable File
65 lines
5.3 KiB
Bash
Executable File
#!/bin/sh
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#------ cli variables -------------------------------------------------------------------------------------------------------------------------------
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PATH=$1 # path for new root
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SHELL=$2 # shell to use in chroot
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#----------------------------------------------------------------------------------------------------------------------------------------------------
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#------- Check root func ----------------------------------------------------------------------------------------------------------------------------
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check_root() {
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if [ $(/usr/bin/id -u) -ne 0 ]; then # cheking root priveleges
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printf "** You must be root\n"
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exit 1 # exit with exit code 1 error
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fi
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}
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#----------------------------------------------------------------------------------------------------------------------------------------------------
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#----------- checking or create dirs ----------------------------------------------------------------------------------------------------------------
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check_or_mkdir() {
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[ ! -d $PATH/dev ] && mkdir -pv $PATH/dev # if directory not exists then mkdir
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[ ! -d $PATH/proc ] && mkdir -pv $PATH/proc # if directory not exists then mkdir
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[ ! -d $PATH/sys ] && mkdir -pv $PATH/sys # if directory not exists then mkdir
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[ ! -d $PATH/run ] && mkdir -pv $PATH/run # if directory not exists then mkdir
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}
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#----------------------------------------------------------------------------------------------------------------------------------------------------
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#-------- mount virtual filesystems -----------------------------------------------------------------------------------------------------------------
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mount_virtual() {
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/usr/bin/mount -v --bind /dev $PATH/dev # mount bind devtmpfs to /dev
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/usr/bin/mount -vt devpts devpts -o gid=5,mode=0620 $PATH/dev/pts # mount devpts to /dev/pts
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/usr/bin/mount -vt proc proc $PATH/proc # mount procfs to /proc
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/usr/bin/mount -vt sysfs sysfs $PATH/sys # mount sysfs to /sys
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/usr/bin/mount -vt tmpfs tmpfs $PATH/run # mount tmpfs to /run
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if [ -h $PATH/dev/shm ]; then # check
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/usr/bin/install -v -d -m 1777 $PATH$(/usr/bin/realpath /dev/shm) # install directories
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else
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/usr/bin/mount -vt tmpfs -o nosuid,nodev tmpfs $PATH/dev/shm # mount tmpfs to /dev/shm
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fi
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/usr/bin/cp -v /etc/resolv.conf $PATH/etc/resolv.conf # copy resolv.conf file to chroot
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}
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#----------------------------------------------------------------------------------------------------------------------------------------------------
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#------ umount virtual filesystems ------------------------------------------------------------------------------------------------------------------
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umount_virtual() {
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/usr/bin/mountpoint -q $PATH/dev/shm && /usr/bin/umount $PATH/dev/shm # umount /dev/shm
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/usr/bin/umount $PATH/dev/pts # umount /dev/pts
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/usr/bin/umount $PATH/{sys,proc,run,dev} # umount /sys,/proc,/run,/dev
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}
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#----------------------------------------------------------------------------------------------------------------------------------------------------
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#------ get shell path func -------------------------------------------------------------------------------------------------------------------------
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get_shell() {
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if [[ "$SHELL" != "" ]]; then # if shell is not empty
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echo $SHELL # return shell
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fi
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echo "/bin/sh" # if shell is empty return /bin/sh
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}
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#----------------------------------------------------------------------------------------------------------------------------------------------------
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#------- main ---------------------------------------------------------------------------------------------------------------------------------------
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check_root # check root priveleges
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check_or_mkdir # check directories for mount virtual filesystems in chroot
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mount_virtual # mount virtual filesystems to chroot
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#---- do chroot in chroot path using shell ----------------------------------------------------------------------------------------------------------
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/usr/bin/chroot \
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$PATH \
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/usr/bin/env -i \
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PATH=/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin \
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$(get_shell)
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#----------------------------------------------------------------------------------------------------------------------------------------------------
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umount_virtual # umount virtual filesystems from chroot
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#----------------------------------------------------------------------------------------------------------------------------------------------------
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