rogier@PC-Rogier:~/Development/halium$ adb root
adbd is already running as root
rogier@PC-Rogier:~/Development/halium$ adb shell
~ # ls
acct                       init.qcom.power.rc         root
boot                       init.qcom.rc               sbin
bugreports                 init.qcom.usb.rc           sdcard
cache                      init.rc                    seapp_contexts
charger                    init.recovery.hlthchrg.rc  selinux_version
config                     init.recovery.service.rc   sepolicy
d                          init.recovery.usb.rc       service_contexts
data                       init.target.rc             sideload
default.prop               license                    storage
dev                        mnt                        sys
efs                        oem                        system
etc                        persist                    tmp
external_sd                preload                    twres
file_contexts              proc                       ueventd.qcom.rc
file_contexts.bin          property_contexts          ueventd.rc
fstab.qcom                 recovery                   usb-otg
init                       res
~ # mkdir /a
~ # mount /data/rootfs.img /a
~ # ls
a                          init                       res
acct                       init.qcom.power.rc         root
boot                       init.qcom.rc               sbin
bugreports                 init.qcom.usb.rc           sdcard
cache                      init.rc                    seapp_contexts
charger                    init.recovery.hlthchrg.rc  selinux_version
config                     init.recovery.service.rc   sepolicy
d                          init.recovery.usb.rc       service_contexts
data                       init.target.rc             sideload
default.prop               license                    storage
dev                        mnt                        sys
efs                        oem                        system
etc                        persist                    tmp
external_sd                preload                    twres
file_contexts              proc                       ueventd.qcom.rc
file_contexts.bin          property_contexts          ueventd.rc
fstab.qcom                 recovery                   usb-otg
~ # cd a
/a # ls
bin         etc         media       root        sys         var
boot        home        mnt         run         system      vendor
data        lib         opt         sbin        tmp
dev         lost+found  proc        srv         usr
/a # cd ..
~ # chroot /a /bin/bash
bash: groups: command not found
root@localhost:/# ls
bash: ls: command not found
root@localhost:/#