front-ends: transparent FUSE remount on I/O errors

All front-ends (sh, b, ls, kill, cleanup, ellie.el, ollie-acme, Kmpl)
now retry file operations after running ollie-remount on failure.
contrib target added to 'all' so ollie-remount is always installed.

acme

@@ -1 +1 @@
-Subproject commit c8e6c50e5382ac51c2fc0957320798be930840ba
+Subproject commit 992050d462d823ac2e251a8fb92e9df4ae242b8c

el

@@ -1 +1 @@
-Subproject commit de3d08ce145218db8522c77c81d30248781ade90
+Subproject commit d97f4c4f4241f1f9abd30797b76b525a86e3e586

mkfile

@@ -7,7 +7,7 @@
 #   mk httpgw     # build only httpgw
 #   mk all        # build everything (default)
 
-all:V: core 9p acme httpgw webui data scripts
+all:V: core 9p acme httpgw webui data scripts contrib
 
 core:V:
 	echo === Building ollie-core ===

scripts/s/b

@@ -11,6 +11,11 @@ MOUNT=${OLLIE:-$HOME/mnt/ollie}
 cmd=${0##*/}
 die() { printf '%s: %s\n' "$cmd" "$*" >&2; exit 1; }
 
+# Retry a command once after remounting on I/O error.
+try() { "$@" 2>/dev/null || { ollie-remount && "$@"; }; }
+# Write $1 to file $2, retrying after remount on failure.
+wf() { printf '%s\n' "$1" > "$2" 2>/dev/null || { ollie-remount && printf '%s\n' "$1" > "$2"; }; }
+
 usage() {
     cat <<EOF
 usage: $cmd [flags] [prompt...]
@@ -87,14 +92,14 @@ agent=${agent}"
 backend=${backend}"
     [ -n "$model"   ] && kv="${kv}
 model=${model}"
-    printf '%s\n' "$kv" > "$MOUNT/s/new" || die "failed to create session"
+    wf "$kv" "$MOUNT/s/new" || die "failed to create session"
 
     # Poll until the session directory is visible (FUSE entry cache may lag).
     local deadline=$(( $(date +%s) + 5 ))
     until [ -d "$B" ] || [ "$(date +%s)" -ge "$deadline" ]; do sleep 0.05; done
     [ -d "$B" ] || die "timeout waiting for session $id"
 
-    printf '%s\n' "$prompt" > "$B/prompt" || die "failed to submit prompt"
+    wf "$prompt" "$B/prompt" || die "failed to submit prompt"
 
     if [ "$bg" -eq 1 ]; then
         printf '%s\n' "$B"
@@ -105,7 +110,7 @@ model=${model}"
     # when parallel sessions access the same mount).
     local state
     while true; do
-        state=$(cat "$B/state" 2>/dev/null | tr -d '[:space:]') || break
+        state=$(try cat "$B/state" | tr -d '[:space:]') || break
         [ "$state" = "idle" ] && break
         sleep 0.5
     done
@@ -117,8 +122,8 @@ model=${model}"
 
     # Print result: chat content from offset onward.
     local offset
-    offset=$(cat "$B/offset" 2>/dev/null || echo 0)
-    tail -c +$((offset + 1)) "$B/chat" 2>/dev/null
+    offset=$(try cat "$B/offset" || echo 0)
+    try tail -c +$((offset + 1)) "$B/chat"
     printf '\n'
 
     [ "$keep" -eq 0 ] && rm -r "$B" 2>/dev/null || true

scripts/s/cleanup

@@ -4,8 +4,10 @@ set -euo pipefail
 
 OLLIE=${OLLIE:-$HOME/mnt/ollie}
 
+remount_once() { ollie-remount 2>/dev/null; }
+
 for sess in "$OLLIE"/s/*/; do
-    [ -d "$sess" ] || continue
+    [ -d "$sess" ] || { remount_once; [ -d "$sess" ] || continue; }
     state=$(awk -F= '$1=="state"{print $2; exit}' "$sess/cfg" 2>/dev/null | tr -d '[:space:]') || continue
     [ "$state" = "idle" ] && rm -r "$sess"
 done

scripts/s/kill

@@ -1,2 +1,3 @@
 #!/usr/bin/env bash
-rm -r ${OLLIE}/s/$1
+OLLIE=${OLLIE:-$HOME/mnt/ollie}
+rm -r "${OLLIE}/s/$1" 2>/dev/null || { ollie-remount && rm -r "${OLLIE}/s/$1"; }

scripts/s/ls

@@ -1,2 +1,3 @@
 #!/usr/bin/env bash
-cat ${OLLIE}/s/idx
+OLLIE=${OLLIE:-$HOME/mnt/ollie}
+cat "$OLLIE/s/idx" 2>/dev/null || { ollie-remount && cat "$OLLIE/s/idx"; }

scripts/s/sh

@@ -24,12 +24,17 @@ fn die {
 	echo $* >[1=2]
 	exit 1
 }
+
+fn remount {
+	ollie-remount >[2]/dev/null
+}
 fn cfg_get {
 	awk -F= -v k=$1 '$1==k{gsub(/^[ \t]+|[ \t]+$/,"",$2); print $2; exit}' $S/cfg >[2]/dev/null
 }
 
 fn is_idle {
-	~ `{cat $S/state >[2]/dev/null} idle
+	state=`{cat $S/state >[2]/dev/null || { remount; cat $S/state >[2]/dev/null }}
+	~ $state idle
 }
 
 fn show_new {
@@ -127,7 +132,13 @@ fn write_new {
 		if(! ~ $#backend 0) printf 'backend=%s\n' $backend
 		if(! ~ $#model 0) printf 'model=%s\n' $model
 		if(! ~ $#agent 0) printf 'agent=%s\n' $agent
-	} > $MOUNT/s/new
+	} > $MOUNT/s/new || { remount; {
+		if(! ~ $#name 0) printf 'name=%s\n' $name
+		printf 'cwd=%s\n' $_dir
+		if(! ~ $#backend 0) printf 'backend=%s\n' $backend
+		if(! ~ $#model 0) printf 'model=%s\n' $model
+		if(! ~ $#agent 0) printf 'agent=%s\n' $agent
+	} > $MOUNT/s/new }
 }
 
 fn create_session {
@@ -199,7 +210,7 @@ chat_off=0
 if(test -f $S/chat) chat_off=`{wc -c < $S/chat}
 
 if(! test -t 0) {
-	cat > $S/prompt || die 'submit failed'
+	cat > $S/prompt || { remount; cat > $S/prompt } || die 'submit failed'
 	exit 0
 }
 
@@ -271,7 +282,7 @@ done; exit 1'}
 		case /*
 			printf 'unknown command: %s\n' `{printf '%s\n' $"input | awk '{print $1}'} >[1=2]
 		case *
-			printf '%s\n' $"input > $S/prompt || { printf 'submit failed\n' >[1=2] }
+			printf '%s\n' $"input > $S/prompt || { remount; printf '%s\n' $"input > $S/prompt } || { printf 'submit failed\n' >[1=2] }
 
 			while(! is_idle) {
 				n=`{wc -c < $S/chat >[2]/dev/null}