bashrc-forward.sh

@@ -8,8 +8,9 @@ bashrc_get () {
     #-# Has some bugs, which is why we have to introduce this bashrc_get and that bashrc_load function, instead
     #-# of just embedding it inside the command substitution.
     echo "set -v"
-    #-# Marker and variable so we can slice out the original .bashrc for relaying and have custom login only for forwarded .bashrc
-    echo "BASHRC_FORWARDED=1"
+    #-# Setting BASH_COMPLETION_VERSINFO because nixos likes to hijack your .bashrc to run bash-completion.sh, which
+    #-# of course fails on remote systems, so we need a way to stop that from happening. Not perfect, but I'll accept the tradeoff.
+    echo "[ \"\${BASH_COMPLETION_VERSINFO-}\" ] || BASH_COMPLETION_VERSINFO="
     #-# There's still a bug in bash at the moment regarding verbose mode not being turned on again after ${ :;}
     #-# https://www.mail-archive.com/bug-bash@gnu.org/msg35966.html
     #-# Therefore, be careful to use this new command substition syntax until it is fixed upstream!
@@ -20,7 +21,7 @@ bashrc_get () {
 bashrc_load () {
   if [ "$_s" ]; then
     #-# Relay .bashrc if it has already been forwarded
-    : "${_s#*[B]ASHRC_FORWARDED=1[[:space:]]}"
+    : "${_s#*[B]ASH_COMPLETION_VERSINFO=[[:space:]]}"
     printf %s "${_%[[:space:]][s]et +v*}"
   else
     #-# Warning: Your `.bashrc` MUST NOT print any error messages at all!
@@ -72,20 +73,25 @@ bashrc_forward () {
               set +o posix
               #-# In case `$0` is checked by other scripts
               BASH_ARGV0=bash
-
               #-# The following host-side command substitution MUST be single line if this file where the bashrc_forward function is defined
               #-# is part of the host-side .bashrc. Otherwise the self-inclusion trick with the `set -v; cat ~/.bashrc; set +v` WILL NOT work,
               #-# either because of a bug in bash or because of a quirk I do not understand. For some reason, if it is multiline, only the line
               #-# where the command substition starts is printed. If there is a trailing backslash, then also the second line is printed. But in
               #-# no circumstance will the last line be printed, no matter what amount of trailing backslashes you add.
               '"$(bashrc_load)"'
-
-              alias bash="-(exec -a sh bash {CURSOR})"
-              #-# tmux has a tight (16384) argument length limit. To bypass that limit, we pass the serialized `.bashrc`
-
-              #-# via an environment variable and deserialize it using eval. Unfortunately, it does not work perfectly.
-              alias tmuxb="FORWARDED_BASHRC=\$(bashrc_forward) tmux -2 new-session '\''\'\'''\''\'\''\'\'''\'''\''\'\'''\''eval \"\$FORWARDED_BASHRC\"'\''\'\'''\''\'\''\'\'''\'''\''\'\'''\''"
-
+              #-# Not universal, but good enough to bash is preferrably invoked as sh so our constructed ENV is loaded.
+              alias bashb="bash -c '\''\'\'''\''\'\''\'\'''\'''\''\'\'''\''exec -a sh bash \"\$@\"'\''\'\'''\''\'\''\'\'''\'''\''\'\'''\'' _"
+              #-# instead of the sudobash alias, you can also just do `sudo bbrc`. Keeping the `sudobash` alias anyway as an alternative.
+              #-# Warning: Be careful! sudobash will run YOUR .bashrc with ROOT on the remote system! You may or may not want this!
+              alias sudobash="ENV_RAW=\$(<\"\$ENV\") sudo --preserve-env=ENV_RAW bash --norc --noprofile -ic '\''\'\'''\''\'\''\'\'''\'''\''\'\'''\''
+                . <(printf %s \"\$ENV_RAW\")
+                unset -v ENV_RAW
+                builtin eval \"\$PROMPT_COMMAND\"
+                builtin exec -a sh bash \"\$@\"
+              '\''\'\'''\''\'\''\'\'''\'''\''\'\'''\'' _"
+              #-# For tmux, it is more complicated. Here, the `ENV_RAW` workaround is actually required, because TMUX restricts the total argument lenght to around 16384 characters, often to little for a complex `.bashrc`
+              #-# If you need a login shell, add a `-l` to the last `bash` invocation
+              alias tmuxb="ENV_RAW=\$(<\"\$ENV\") tmux -2 new-session '\''\'\'''\''\'\''\'\'''\'''\''\'\'''\''bash --norc --noprofile -ic '\''\'\'''\''\'\''\'\'''\'''\''\'\'''\''\'\''\'\'''\''\'\''\'\'''\'''\''\'\'''\'''\''\'\'''\''\'\''\'\'''\'''\''\'\'''\''. <(printf %s \"\$ENV_RAW\"); unset -v ENV_RAW; builtin eval \"\$PROMPT_COMMAND\"; builtin exec -a sh bash'\''\'\'''\''\'\''\'\'''\'''\''\'\'''\''\'\''\'\'''\''\'\''\'\'''\'''\''\'\'''\'''\''\'\'''\''\'\''\'\'''\'''\''\'\'''\'' '\''\'\'''\''\'\''\'\'''\'''\''\'\'''\''"
               #-# Using PROMPT_COMMAND instead of DEBUG trap because of speed tradeoffs (DEBUG trap runs way too often)
               #-# Also explicitly removing the export flag as to not append needlessly, in case the remote system exported it accidentally.
               declare +x PROMPT_COMMAND=$PROMPT_COMMAND'\''\'\'''\''\'\''\'\'''\'''\''\'\'''\''