X-Git-Url: https://feistymeow.org/gitweb/?a=blobdiff_plain;f=scripts%2Fcore%2Ffunctions.sh;h=0f356d6ef8d094550f32c8c924f5a37b529e0d7d;hb=2a3510674c526e4cb17c54054ad3d613c9e97fd3;hp=647c8ef9b90370dbd76eaf59aa2bf374b7ee3634;hpb=58c0d313ec5897ff54e959e0e94be0e398be958d;p=feisty_meow.git

diff --git a/scripts/core/functions.sh b/scripts/core/functions.sh
index 647c8ef9..0f356d6e 100644
--- a/scripts/core/functions.sh
+++ b/scripts/core/functions.sh
@@ -33,6 +33,20 @@ if [ -z "$skip_all" ]; then
     date +"%Y$sep%m$sep%d$sep%H%M$sep%S" | tr -d '/\n/'
   }
   
+  # a wrapper for the which command that finds items on the path.  some OSes
+  # do not provide which, so we want to not be spewing errors when that
+  # happens.
+  function whichable()
+  {
+    to_find="$1"; shift
+    local WHICHER="$(\which which 2>/dev/null)"
+    if [ $? -ne 0 ]; then
+      # there is no which command here.  we produce nothing due to this.
+      echo
+    fi
+    echo $($WHICHER $to_find 2>/dev/null)
+  }
+
   # makes a directory of the name specified and then tries to change the
   # current directory to that directory.
   function mcd() {
@@ -407,38 +421,33 @@ if [ -z "$skip_all" ]; then
   }
   
   # this function wraps the normal sudo by ensuring we replace the terminal
-  # label before we launch what they're passing to sudo.  we also ensure that
-  # the feisty meow environment is recreated; normal subshells don't need
-  # this, but when switching identity with sudo, it seems important.  yet,
-  # we also don't want to hose up their normal sudo actions, such as passing
-  # along the current environment, should the user choose.
+  # label before we launch what they're passing to sudo.  we also preserve
+  # specific variables that enable the main user's ssh credentials to still
+  # be relied on for ssh forwarding, even if the '-i' flag is passed to cause
+  # a fresh shell (which normally doesn't get the launching user's environment
+  # variables).
   function sudo() {
     save_terminal_title
+
     # hoist our X authorization info in case environment is passed along;
-    # this can allow root to use our display to show Xorg windows.
-    if [ ! -z "$DISPLAY" ]; then
+    # this can allow root to use our display to show X.org windows.
+    if [ -z "$IMPORTED_XAUTH" -a ! -z "$DISPLAY" ]; then
       export IMPORTED_XAUTH="$(xauth list $DISPLAY | head -n 1 | awk '{print $3}')"
+      local REMOVE_IMP_XAUTH=true
     fi
-    # prep a simple command string here, rather than messing with arguments
-    # in the already complicated command below.  i was seeing some really
-    # screwy behavior trying to expand $@ when embedded for the bash -c flag,
-    # but making the variable ahead of time gets rid of that.
-    cmd="/usr/bin/sudo ""$@"
-
-    # omit any variables that are either wrong for a different user or used
-    # to shield the feisty meow scripts from reconfiguring.  when we do the
-    # sudo, we want a fresh start for feisty meow at least.
-    # our approach to launching sudo is further complicated by our sentinel
-    # alias, which normally is passed to any subshells (to prevent recreating
-    # aliases).  we turn off the expand_aliases shell option to avoid passing
-    # the sentinel, which ensures aliases do get recreated for the new user.
-    BUILD_VARS_LOADED= \
-    CORE_VARIABLES_LOADED= \
-    FEISTY_MEOW_SCRIPTS_LOADED= \
-    function_sentinel= \
-    MAIL= \
-    bash +O expand_aliases -c "$cmd"
+
+    # launch sudo with just the variables we want to reach the other side.
+    local varmods=
+#    varmods+="PATH= "
+    if [ ! -z "$IMPORTED_XAUTH" ]; then varmods+="IMPORTED_XAUTH=$IMPORTED_XAUTH "; fi
+    if [ ! -z "$SSH_AUTH_SOCK" ]; then varmods+="SSH_AUTH_SOCK=$SSH_AUTH_SOCK"; fi
+    /usr/bin/sudo $varmods "$@"
     retval=$?
+
+    # take the xauth info away again if it wasn't set already.
+    if [ ! -z "$REMOVE_IMP_XAUTH" ]; then
+      unset IMPORTED_XAUTH
+    fi
     restore_terminal_title
     return $retval
   }
@@ -453,7 +462,7 @@ if [ -z "$skip_all" ]; then
 
   # overlay for nechung binary so that we can complain less grossly about it when it's missing.
   function nechung() {
-    local wheres_nechung=$(which nechung 2>/dev/null)
+    local wheres_nechung=$(whichable nechung)
     if [ -z "$wheres_nechung" ]; then
       echo "The nechung oracle program cannot be found.  You may want to consider"
       echo "rebuilding the feisty meow applications with this command:"
@@ -569,20 +578,6 @@ automatic if there is even a small amount of doubt about the issue."
     echo
   }
 
-  # a wrapper for the which command that finds items on the path.  some OSes
-  # do not provide which, so we want to not be spewing errors when that
-  # happens.
-  function whichable()
-  {
-    to_find="$1"; shift
-    which which &>/dev/null
-    if [ $? -ne 0 ]; then
-      # there is no which command here.  we produce nothing due to this.
-      echo
-    fi
-    echo $(which $to_find)
-  }
-
   function add_cygwin_drive_mounts() {
     for i in c d e f g h q z ; do
 #hmmm: improve this by not adding the link if already there, or if the drive is not valid.
@@ -838,7 +833,7 @@ return 0
       this_host=$(hostname)
     elif [ ! -z "$(echo $MACHTYPE | grep suse)" ]; then
       this_host=$(hostname --long)
-    elif [ -x "$(which hostname 2>/dev/null)" ]; then
+    elif [ -x "$(whichable hostname)" ]; then
       this_host=$(hostname)
     fi
     echo "$this_host"
@@ -937,7 +932,21 @@ return 0
 
   ##############
 
-  # site avenger aliases
+  # tty relevant functions...
+
+  # keep_awake: sends a message to the screen from the background.
+  function keep_awake()
+  {
+    # just starts the keep_awake process in the background.
+    bash $FEISTY_MEOW_SCRIPTS/tty/keep_awake_process.sh &
+      # this should leave the job running as %1 or a higher number if there
+      # are pre-existing background jobs.
+  }
+
+  ##############
+
+  # site avenger functions...
+
   function switchto()
   {
     THISDIR="$FEISTY_MEOW_SCRIPTS/site_avenger"