Can't enter in root environment

[ritcher]

There is the output I got:

$ tsu --dbg
+ shift
+ _TSU_CALL=tsu
+ [[ tsu == \s\u\d\o ]]
+ TERMUX_FS=/data/data/com.termux/files
+ TERMUX_PREFIX=/data/data/com.termux/files/usr
+ TERMUX_PATH=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets
+ ROOT_HOME=/data/data/com.termux/files/home/.suroot
+ ANDROID_SYSPATHS=/system/bin:/system/xbin
+ EXTRA_SYSPATHS=/sbin:/sbin/bin
+ BB_MAGISK=/sbin/.magisk/busybox
+ log_DEBUG TSU_AS_SUDO
+ [[ '' == true ]]
+ log_DEBUG _TSU_AS_SUDO
+ [[ -z '' ]]
+ SWITCH_USER=
+ declare -A EXP_ENV
+ log_DEBUG _TSU_AS_SUDO
+ [[ '' == true ]]
+ root_shell_helper
+ log_DEBUG root_shell_helper
+ [[ -n '' ]]
+ log_DEBUG ALT_SHELL
+ [[ '' == \s\y\s\t\e\m ]]
+ [[ -n '' ]]
+ [[ -x /data/data/com.termux/files/home/.termux/shell ]]
++ readlink -f -- /data/data/com.termux/files/home/.termux/shell
+ ROOT_SHELL=/data/data/com.termux/files/usr/bin/zsh
+ env_path_helper
+ log_DEBUG env_path_helper
+ log_DEBUG SWITCH_USER
+ [[ -z '' ]]
+ [[ -d /data/data/com.termux/files/home/.suroot ]]
+ NEW_HOME=/data/data/com.termux/files/home/.suroot
+ EXP_ENV[PREFIX]=/data/data/com.termux/files/usr
+ EXP_ENV[TMPDIR]=/data/data/com.termux/files/home/.suroot/.tmp
+ EXP_ENV[LD_PRELOAD]=/data/data/com.termux/files/usr/lib/libtermux-exec.so
+ log_DEBUG _TSU_AS_SUDO
+ [[ '' == true ]]
+ NEW_PATH=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets
+ log_DEBUG LD_LIBRARY_PATH
+ [[ -n '' ]]
+ ASP=/system/bin:/system/xbin:/sbin:/sbin/bin
+ log_DEBUG PREPEND_SYSTEM_PATH
+ [[ -n '' ]]
+ NEW_PATH=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets:/system/bin:/system/xbin:/sbin:/sbin/bin
+ EXP_ENV[PATH]=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets:/system/bin:/system/xbin:/sbin:/sbin/bin
+ EXP_ENV[HOME]=/data/data/com.termux/files/home/.suroot
+ EXP_ENV[TERM]=xterm-256color
+ [[ -z true ]]
+ set +x
+ STARTUP_SCRIPT=/data/data/com.termux/files/usr/bin/zsh
+ SU_BINARY_SEARCH=("/system/xbin/su" "/system/bin/su")
+ [[ -x /sbin ]]
+ SU_BINARY_SEARCH+=("/sbin/su" "/sbin/bin/su")
+ unset LD_LIBRARY_PATH
+ unset LD_PRELOAD
+ [[ -z '' ]]
++ /sbin/su -v
+ [[ 20.4:MAGISKSU == *\M\A\G\I\S\K\S\U ]]
+ su_args=("/sbin/su")
+ [[ -z '' ]]
+ su_cmdline='PATH=/sbin/.magisk/busybox '
+ [[ -n '' ]]
+ su_cmdline+='env -i  PATH=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets:/system/bin:/system/xbin:/sbin:/sbin/bin  ANDROID_DATA=/data  TMPDIR=/data/data/com.termux/files/home/.suroot/.tmp  PREFIX=/data/data/com.termux/files/usr  TERM=xterm-256color  LD_PRELOAD=/data/data/com.termux/files/usr/lib/libtermux-exec.so  ANDROID_ROOT=/system  HOME=/data/data/com.termux/files/home/.suroot  /data/data/com.termux/files/usr/bin/zsh'
+ su_args+=("-c")
+ exec /sbin/su -c 'PATH=/sbin/.magisk/busybox env -i  PATH=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets:/system/bin:/system/xbin:/sbin:/sbin/bin  ANDROID_DATA=/data  TMPDIR=/data/data/com.termux/files/home/.suroot/.tmp  PREFIX=/data/data/com.termux/files/usr  TERM=xterm-256color  LD_PRELOAD=/data/data/com.termux/files/usr/lib/libtermux-exec.so  ANDROID_ROOT=/system  HOME=/data/data/com.termux/files/home/.suroot  /data/data/com.termux/files/usr/bin/zsh'
/system/bin/sh: env: not found

Changing the env command call to /system/bin/env or /data/data/com.termux/files/usr/bin/coreutils --coreutils-prog=env solves the problem:

$ sed -i 's/env /\/system\/bin\/env /g' ../usr/bin/tsu
$ tsu --dbg
+ shift
+ _TSU_CALL=tsu
+ [[ tsu == \s\u\d\o ]]
+ TERMUX_FS=/data/data/com.termux/files
+ TERMUX_PREFIX=/data/data/com.termux/files/usr
+ TERMUX_PATH=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets
+ ROOT_HOME=/data/data/com.termux/files/home/.suroot
+ ANDROID_SYSPATHS=/system/bin:/system/xbin
+ EXTRA_SYSPATHS=/sbin:/sbin/bin
+ BB_MAGISK=/sbin/.magisk/busybox
+ log_DEBUG TSU_AS_SUDO
+ [[ '' == true ]]
+ log_DEBUG _TSU_AS_SUDO
+ [[ -z '' ]]
+ SWITCH_USER=
+ declare -A EXP_ENV
+ log_DEBUG _TSU_AS_SUDO
+ [[ '' == true ]]
+ root_shell_helper
+ log_DEBUG root_shell_helper
+ [[ -n '' ]]
+ log_DEBUG ALT_SHELL
+ [[ '' == \s\y\s\t\e\m ]]
+ [[ -n '' ]]
+ [[ -x /data/data/com.termux/files/home/.termux/shell ]]
++ readlink -f -- /data/data/com.termux/files/home/.termux/shell
+ ROOT_SHELL=/data/data/com.termux/files/usr/bin/zsh
+ env_path_helper
+ log_DEBUG env_path_helper
+ log_DEBUG SWITCH_USER
+ [[ -z '' ]]
+ [[ -d /data/data/com.termux/files/home/.suroot ]]
+ NEW_HOME=/data/data/com.termux/files/home/.suroot
+ EXP_ENV[PREFIX]=/data/data/com.termux/files/usr
+ EXP_ENV[TMPDIR]=/data/data/com.termux/files/home/.suroot/.tmp
+ EXP_ENV[LD_PRELOAD]=/data/data/com.termux/files/usr/lib/libtermux-exec.so
+ log_DEBUG _TSU_AS_SUDO
+ [[ '' == true ]]
+ NEW_PATH=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets
+ log_DEBUG LD_LIBRARY_PATH
+ [[ -n '' ]]
+ ASP=/system/bin:/system/xbin:/sbin:/sbin/bin
+ log_DEBUG PREPEND_SYSTEM_PATH
+ [[ -n '' ]]
+ NEW_PATH=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets:/system/bin:/system/xbin:/sbin:/sbin/bin
+ EXP_ENV[PATH]=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets:/system/bin:/system/xbin:/sbin:/sbin/bin
+ EXP_ENV[HOME]=/data/data/com.termux/files/home/.suroot
+ EXP_ENV[TERM]=xterm-256color
+ [[ -z true ]]
+ set +x
+ STARTUP_SCRIPT=/data/data/com.termux/files/usr/bin/zsh
+ SU_BINARY_SEARCH=("/system/xbin/su" "/system/bin/su")
+ [[ -x /sbin ]]
+ SU_BINARY_SEARCH+=("/sbin/su" "/sbin/bin/su")
+ unset LD_LIBRARY_PATH
+ unset LD_PRELOAD
+ [[ -z '' ]]
++ /sbin/su -v
+ [[ 20.4:MAGISKSU == *\M\A\G\I\S\K\S\U ]]
+ su_args=("/sbin/su")
+ [[ -z '' ]]
+ su_cmdline='PATH=/sbin/.magisk/busybox '
+ [[ -n '' ]]
+ su_cmdline+='/system/bin/env -i  PATH=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets:/system/bin:/system/xbin:/sbin:/sbin/bin  ANDROID_DATA=/data  TMPDIR=/data/data/com.termux/files/home/.suroot/.tmp  PREFIX=/data/data/com.termux/files/usr  TERM=xterm-256color  LD_PRELOAD=/data/data/com.termux/files/usr/lib/libtermux-exec.so  ANDROID_ROOT=/system  HOME=/data/data/com.termux/files/home/.suroot  /data/data/com.termux/files/usr/bin/zsh'
+ su_args+=("-c")
+ exec /sbin/su -c 'PATH=/sbin/.magisk/busybox /system/bin/env -i  PATH=/data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets:/system/bin:/system/xbin:/sbin:/sbin/bin  ANDROID_DATA=/data  TMPDIR=/data/data/com.termux/files/home/.suroot/.tmp  PREFIX=/data/data/com.termux/files/usr  TERM=xterm-256color  LD_PRELOAD=/data/data/com.termux/files/usr/lib/libtermux-exec.so  ANDROID_ROOT=/system  HOME=/data/data/com.termux/files/home/.suroot  /data/data/com.termux/files/usr/bin/zsh'
# id
uid=0(root) gid=0(root) groups=0(root)

[sjevtic]

The error means that /sbin/.magisk/busybox/env cannot be found, so check that Magisk Manager has completed setup.

Every time you wipe your /data partition you must actually open the Magisk Manager GUI, wait for the "additional setup required" prompt and complete the setup process including the subsequent reboot before trying tsu.