[arch-projects] any interest?: initcpio cleanup_hook function

[Matthew Monaco]

This has *not* been tested. I just wanted to see if there'd be any interest.

"cleanup_hook" is run in the reverse order of run_hooks, if available.

This would be useful to the dropbear hook in AUR. I know systemd is killing off
processes automatically, but even if initcpio/initscripts started doing this,
dropbear still sets up a network interface. Unlike the net hook, dropbear's
setup is meant to be undone.

diff --git i/init w/init
index 1f5f865..e9a6924 100644
--- i/init
+++ w/init
@@ -43,33 +43,48 @@ fi
 if [ -e "/hooks" ]; then
     for h in ${HOOKS}; do
         TST=""
         eval "TST=\$hook_${h}"
         if [ "${TST}" != "disabled" ]; then
             run_hook () { msg "${h}: no run function defined"; }
             if [ -e "/hooks/${h}" ]; then
                . /hooks/${h}
                msg ":: Running Hook [${h}]"
                run_hook
             fi
         fi
     done
+
+    for h in $(echo -n "${HOOKS} " | tac -s' '); do
+        TST=""
+        eval "TST=\$hook_${h}"
+        if [ "${TST}" != "disabled" ]; then
+            unset cleanup_hook
+            if [ -e "/hooks/${h}" ]; then
+               . /hooks/${h}
+               if [ "$(type -t foo 2>/dev/null)" == function ]; then
+                   msg ":: Running Hook Cleanup [${h}]"
+                   cleanup_hook
+               fi
+            fi
+        fi
+    done
 fi

 # honor the old behavior of break=y as a synonym for break=premount