chg: dev: ``cached_cmd_on_base_image`` is now cached through sessions.

bin/compose-core

@@ -343,6 +343,35 @@ docker_has_image() {
 export -f docker_has_image
 
 
+docker_image_id() {
+    local image="$1" image_id cache_file="$state_dir/$FUNCNAME.cache.$(echo "$*" | md5_compat)"
+    if [ -e "$cache_file" ]; then
+        # debug "$FUNCNAME: cache hit ($*)"
+        quick_cat_stdin < "$cache_file"
+        return 0
+    fi
+    image_id=$(docker inspect "$image" --format='{{.Id}}') || return 1
+    echo "$image_id" | tee "$cache_file"
+}
+export -f docker_image_id
+
+
+cached_cmd_on_image() {
+    local image="$1" cache_file
+    image_id=$(docker_image_id "$image") || return 1
+    cache_file="$CACHEDIR/$FUNCNAME.cache.$(echo "$*" | md5_compat)"
+    if [ -e "$cache_file" ]; then
+        # debug "$FUNCNAME: cache hit ($*)"
+        quick_cat_stdin < "$cache_file"
+        return 0
+    fi
+    shift
+    out=$(docker run -i --rm --entrypoint /bin/bash "$image_id" -c "$*") || return 1
+    echo "$out" | tee "$cache_file"
+}
+export -f cached_cmd_on_image
+
+
 cmd_on_base_image() {
     local service="$1" base_image
     shift
@@ -353,14 +382,18 @@ export -f cmd_on_base_image
 
 
 cached_cmd_on_base_image() {
-    local service="$1" cache_file="$state_tmpdir/$FUNCNAME.cache.$(echo "$*" | md5_compat)"
+    local service="$1" base_image cache_file="$state_dir/$FUNCNAME.cache.$(printf "%s\0" "$@" | md5_compat)"
     shift
     if [ -e "$cache_file" ]; then
         # debug "$FUNCNAME: cache hit ($*)"
         quick_cat_stdin < "$cache_file"
         return 0
     fi
-    result=$(cmd_on_base_image "$service" "$@") || return 1
+    base_image=$(service_base_docker_image "$service") || return 1
+    if ! docker_has_image "$base_image"; then
+        docker pull "$base_image"
+    fi
+    result=$(cached_cmd_on_image "$base_image" "$@") || return 1
     echo "$result" | tee "$cache_file"
 }
 export -f cached_cmd_on_base_image