347 lines
11 KiB
Bash
347 lines
11 KiB
Bash
#!/bin/sh
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# Copyright (C) 2022 Kovid Goyal <kovid at kovidgoyal.net>
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# Distributed under terms of the GPLv3 license.
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saved_tty_settings=""
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cleanup_on_bootstrap_exit() {
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[ -n "$saved_tty_settings" ] && command stty "$saved_tty_settings" 2> /dev/null < /dev/tty
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saved_tty_settings=""
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}
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die() { printf "\033[31m%s\033[m\n\r" "$*" > /dev/stderr; cleanup_on_bootstrap_exit; exit 1; }
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init_tty() {
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saved_tty_settings=$(command stty -g 2> /dev/null < /dev/tty)
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tty_ok="n"
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[ -n "$saved_tty_settings" ] && tty_ok="y"
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if [ "$tty_ok" = "y" ]; then
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command stty raw min 1 time 0 -echo 2> /dev/null < /dev/tty || die "stty failed to set raw mode"
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return 0
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fi
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return 1
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}
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# try to use zsh's builtin sysread function for reading to TTY
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# as it is superior to the POSIX variants. The builtin read function doesn't work
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# as it hangs reading N bytes on macOS
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tty_fd=-1
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if builtin zmodload zsh/system 2> /dev/null; then
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builtin sysopen -o cloexec -rwu tty_fd -- "$TTY" 2> /dev/null
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[ $tty_fd = -1 ] && builtin sysopen -o cloexec -rwu tty_fd -- /dev/tty 2> /dev/null
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fi
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if [ $tty_fd -gt -1 ]; then
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dcs_to_kitty() {
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builtin local b64data
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b64data=$(builtin printf "%s" "$2" | builtin command base64)
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builtin print -nu "$tty_fd" '\eP@kitty-'"${1}|${b64data//[[:space:]]}"'\e\\'
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}
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read_one_byte_from_tty() {
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builtin sysread -s "1" -i "$tty_fd" n 2> /dev/null
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return $?
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}
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read_n_bytes_from_tty() {
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builtin let num_left=$1
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while [ $num_left -gt 0 ]; do
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builtin sysread -c num_read -s "$num_left" -i "$tty_fd" -o "1" 2> /dev/null || die "Failed to read $num_left bytes from TTY using sysread"
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builtin let num_left=$num_left-$num_read
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done
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}
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else
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dcs_to_kitty() { printf "\033P@kitty-$1|%s\033\\" "$(printf "%s" "$2" | command base64 | command tr -d \\n)" > /dev/tty; }
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read_one_byte_from_tty() {
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# We need a way to read a single byte at a time and to read a specified number of bytes in one invocation.
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# The options are head -c, read -N and dd
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#
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# read -N is not in POSIX and dash/posh dont implement it. Also bash seems to read beyond
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# the specified number of bytes into an internal buffer.
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#
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# head -c reads beyond the specified number of bytes into an internal buffer on macOS
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#
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# POSIX dd works for one byte at a time but for reading X bytes it needs the GNU iflag=count_bytes
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# extension, and is anyway unsafe as it can lead to corrupt output when the read syscall is interrupted.
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n=$(command dd bs=1 count=1 2> /dev/null < /dev/tty)
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return $?
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}
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read_n_bytes_from_tty() {
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# using dd with bs=1 is very slow, so use head. On non GNU coreutils head
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# does not limit itself to reading -c bytes only from the pipe so we can potentially lose
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# some trailing data, for instance if the user starts typing. Cant be helped.
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command head -c "$1" < /dev/tty
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}
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fi
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debug() { dcs_to_kitty "print" "debug $1"; }
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echo_via_kitty() { dcs_to_kitty "echo" "$1"; }
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if [ -z "$HOSTNAME" ]; then
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hostname=$(command hostname 2> /dev/null)
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if [ -z "$hostname" ]; then
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hostname=$(command hostnamectl hostname 2> /dev/null)
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if [ -z "$hostname" ]; then
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hostname="_";
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fi
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fi
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else
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hostname="$HOSTNAME"
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fi
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# ensure $HOME is set
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if [ -z "$HOME" ]; then HOME=~; fi
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# ensure $USER is set
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if [ -z "$USER" ]; then USER=$(command whoami 2> /dev/null); fi
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# ask for the SSH data
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data_password="DATA_PASSWORD"
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password_filename="PASSWORD_FILENAME"
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leading_data=""
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init_tty && trap 'cleanup_on_bootstrap_exit' EXIT
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[ "$tty_ok" = "y" ] && dcs_to_kitty "ssh" "hostname="$hostname":pwfile="$password_filename":user="$USER":pw="$data_password""
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record_separator=$(printf "\036")
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mv_files_and_dirs() {
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cwd="$PWD";
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cd "$1";
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command find . -type d -exec mkdir -p "$2/{}" ";"
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command find . -type l -exec sh -c "tgt=\$(command readlink -n \"{}\"); command ln -sf \"\$tgt\" \"$2/{}\"; command rm -f \"{}\"" ";"
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command find . -type f -exec mv "{}" "$2/{}" ";"
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cd "$cwd";
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}
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untar_and_read_env() {
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# extract the tar file atomically, in the sense that any file from the
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# tarfile is only put into place after it has been fully written to disk
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tdir=$(command mktemp -d "$HOME/.kitty-ssh-kitten-untar-XXXXXXXXXXXX");
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[ $? = 0 ] || die "Creating temp directory failed";
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read_n_bytes_from_tty "$1" | command base64 -d | command tar xjf - --no-same-owner -C "$tdir";
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data_file="$tdir/data.sh";
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[ -f "$data_file" ] && . "$data_file";
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data_dir="$HOME/$KITTY_SSH_KITTEN_DATA_DIR"
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mv_files_and_dirs "$tdir/home" "$HOME"
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[ -e "$tdir/root" ] && mv_files_and_dirs "$tdir/root" ""
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command rm -rf "$tdir";
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[ -z "KITTY_SSH_KITTEN_DATA_DIR" ] && die "Failed to read SSH data from tty";
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unset KITTY_SSH_KITTEN_DATA_DIR;
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}
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read_record() {
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record=""
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while :; do
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read_one_byte_from_tty || die "Reading a byte from the TTY failed"
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[ "$n" = "$record_separator" ] && break
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record="$record$n"
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done
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printf "%s" "$record"
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}
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get_data() {
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leading_data=$(read_record)
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size=$(read_record)
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case "$size" in
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("!"*)
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die "$size"
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;;
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esac
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untar_and_read_env "$size"
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}
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if [ "$tty_ok" = "y" ]; then
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get_data
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cleanup_on_bootstrap_exit
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if [ -n "$leading_data" ]; then
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# clear current line as it might have things echoed on it from leading_data
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# because we only turn off echo in this script whereas the leading bytes could
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# have been sent before the script had a chance to run
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printf "\r\033[K"
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fi
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shell_integration_dir="$data_dir/shell-integration"
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[ -f "$HOME/.terminfo/kitty.terminfo" ] || die "Incomplete extraction of ssh data";
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# export TERMINFO
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tname=".terminfo"
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if [ -e "/usr/share/misc/terminfo.cdb" ]; then
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# NetBSD requires this see https://github.com/kovidgoyal/kitty/issues/4622
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tname=".terminfo.cdb"
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fi
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export TERMINFO="$HOME/$tname"
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# compile terminfo for this system
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if [ -x "$(command -v tic)" ]; then
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tic_out=$(command tic -x -o "$HOME/$tname" "$HOME/.terminfo/kitty.terminfo" 2>&1)
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rc=$?
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if [ "$rc" != "0" ]; then die "$tic_out"; fi
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fi
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fi
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login_shell_is_ok() {
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if [ -z "$login_shell" -o ! -x "$login_shell" ]; then return 1; fi
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case "$login_shell" in
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*sh) return 0;
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esac
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return 1;
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}
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detect_python() {
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python=$(command -v python3)
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if [ -z "$python" ]; then python=$(command -v python2); fi
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if [ -z "$python" ]; then python=$(command -v python); fi
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if [ -z "$python" -o ! -x "$python" ]; then return 1; fi
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return 0;
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}
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parse_passwd_record() {
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printf "%s" "$(command grep -o '[^:]*$')"
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}
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using_getent() {
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cmd=$(command -v getent)
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if [ -n "$cmd" ]; then
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output=$($cmd passwd $USER 2>/dev/null)
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if [ $? = 0 ]; then
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login_shell=$(echo $output | parse_passwd_record);
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if login_shell_is_ok; then return 0; fi
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fi
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fi
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return 1;
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}
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using_id() {
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cmd=$(command -v id)
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if [ -n "$cmd" ]; then
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output=$($cmd -P $USER 2>/dev/null)
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if [ $? = 0 ]; then
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login_shell=$(echo $output | parse_passwd_record);
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if login_shell_is_ok; then return 0; fi
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fi
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fi
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return 1;
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}
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using_passwd() {
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if [ -f "/etc/passwd" -a -r "/etc/passwd" ]; then
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output=$(command grep "^$USER:" /etc/passwd 2>/dev/null)
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if [ $? = 0 ]; then
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login_shell=$(echo $output | parse_passwd_record);
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if login_shell_is_ok; then return 0; fi
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fi
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fi
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return 1;
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}
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using_python() {
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if detect_python; then
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output=$(command $python -c "import pwd, os; print(pwd.getpwuid(os.geteuid()).pw_shell)")
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if [ $? = 0 ]; then
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login_shell=$output;
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if login_shell_is_ok; then return 0; fi
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fi
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fi
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return 1
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}
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execute_with_python() {
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if detect_python; then
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exec $python -c "import os; os.execl('$login_shell', '-' '$shell_name')"
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fi
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return 1;
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}
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if [ -n "$KITTY_LOGIN_SHELL" ]; then
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login_shell="$KITTY_LOGIN_SHELL"
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unset KITTY_LOGIN_SHELL
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else
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using_getent || using_id || using_python || using_passwd || die "Could not detect login shell";
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fi
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shell_name=$(command basename $login_shell)
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# If a command was passed to SSH execute it here
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EXEC_CMD
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if [ "$tty_ok" = "n" ]; then
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if [ -z "$(command -v stty)" ]; then
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printf "%s\n" "stty missing ssh kitten cannot function" > /dev/stderr
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else
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printf "%s\n" "stty failed ssh kitten cannot function" > /dev/stderr
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fi
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fi
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exec_bash_with_integration() {
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export ENV="$shell_integration_dir/bash/kitty.bash"
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export KITTY_BASH_INJECT="1"
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if [ -z "$HISTFILE" ]; then
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export HISTFILE="$HOME/.bash_history"
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export KITTY_BASH_UNEXPORT_HISTFILE="1"
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fi
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exec "$login_shell" "--posix"
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}
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exec_zsh_with_integration() {
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zdotdir="$ZDOTDIR"
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if [ -z "$zdotdir" ]; then
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zdotdir=~;
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unset KITTY_ORIG_ZDOTDIR # ensure this is not propagated
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else
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export KITTY_ORIG_ZDOTDIR="$zdotdir"
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fi
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# dont prevent zsh-new-user from running
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if [ -f "$zdotdir/.zshrc" -o -f "$zdotdir/.zshenv" -o -f "$zdotdir/.zprofile" -o -f "$zdotdir/.zlogin" ]; then
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export ZDOTDIR="$shell_integration_dir/zsh"
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exec "$login_shell" "-l"
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fi
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}
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exec_fish_with_integration() {
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if [ -z "$XDG_DATA_DIRS" ]; then
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export XDG_DATA_DIRS="$shell_integration_dir"
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else
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export XDG_DATA_DIRS="$shell_integration_dir:$XDG_DATA_DIRS"
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fi
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export KITTY_FISH_XDG_DATA_DIR="$shell_integration_dir"
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exec "$login_shell" "-l"
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}
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exec_with_shell_integration() {
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case "$shell_name" in
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"zsh")
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exec_zsh_with_integration
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;;
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"bash")
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exec_bash_with_integration
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;;
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"fish")
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exec_fish_with_integration
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;;
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esac
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}
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case "$KITTY_SHELL_INTEGRATION" in
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("")
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# only blanks or unset
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unset KITTY_SHELL_INTEGRATION
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;;
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(*)
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# not blank
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q=$(printf "%s" "$KITTY_SHELL_INTEGRATION" | command grep '\bno-rc\b')
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if [ -z "$q" ]; then
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exec_with_shell_integration
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# exec failed, unset
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unset KITTY_SHELL_INTEGRATION
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fi
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;;
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esac
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# We need to pass the first argument to the executed program with a leading -
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# to make sure the shell executes as a login shell. Note that not all shells
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# support exec -a so we use the below to try to detect such shells
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if [ -z "$PIPESTATUS" ]; then
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# the dash shell does not support exec -a and also does not define PIPESTATUS
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execute_with_python
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exec $login_shell "-l"
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fi
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exec -a "-$shell_name" $login_shell
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