Add unpack state, command not found errors

app/classes/state/fs/PackState.js

@@ -0,0 +1,60 @@
+const State = require('../State')
+
+class PackState extends State {
+    async apply() {
+        if ( !(await this.check()) ) {
+            const path = await this._path()
+            const destination = await this._destination()
+            const type = await this._get_type()
+            const cd_cmd = await this._host.get_directory_change_command(await path.parent())
+
+            if ( type === 'tar' ) {
+                const tar_cmd = `${cd_cmd} && tar czf "${destination.path}" "${path.name()}"`
+                await this._host.run(tar_cmd)
+            } else if ( type === 'zip' ) {
+                const zip_cmd = `${cd_cmd} && zip -r "${destination.path}" "${path.name()}"`
+                await this._host.run(zip_cmd)
+            }
+        }
+    }
+
+    async check() {
+        const dest = await this._destination()
+        return dest.is_valid()
+    }
+
+    async reverse() {
+        if ( await this.check() ) {
+            const destination = await this._destination()
+            await destination.classify()
+            if (destination.is_valid()) await destination.unlink()
+        }
+    }
+
+    async _get_type() {
+        if ( this._config.format ) {
+            if ( this._config.format === 'tar' ) return 'tar'
+            else if ( this._config.format === 'zip' ) return 'zip'
+            throw new Error('Invalid unpack format: ' + this._config.type)
+        } else {
+            const dest = await this._destination()
+            if ( dest.path.endsWith('.tar.gz') || dest.path.endsWith('.tgz') ) return 'tar'
+            else if ( dest.path.endsWith('.zip') ) return 'zip'
+            throw new Error(`Unable to determine unpack type from destination: ${dest}`)
+        }
+    }
+
+    async _destination() {
+        if ( !this._config.destination ) throw new Error('Missing destination config for PackState.')
+        return await this._host.get_path(this._config.destination)
+    }
+
+    async _path() {
+        const path = await this._host.get_path(this._config.path)
+        await path.classify()
+        if ( !path.is_valid() ) throw new Error(`Invalid path for PathState: ${path}`)
+        return path
+    }
+}
+
+module.exports = exports = PackState

app/classes/state/fs/UnpackState.js

@@ -34,10 +34,10 @@ class UnpackState extends State {
     }
 
     async _get_type() {
-        if ( this._config.type ) {
-            if ( this._config.type === 'tar' ) return 'tar'
-            else if ( this._config.type === 'zip' ) return 'zip'
-            throw new Error('Invalid unpack type: ' + this._config.type)
+        if ( this._config.format ) {
+            if ( this._config.format === 'tar' ) return 'tar'
+            else if ( this._config.format === 'zip' ) return 'zip'
+            throw new Error('Invalid unpack format: ' + this._config.type)
         } else {
             const path = await this._path()
             if ( path.path.endsWith('.tar.gz') || path.path.endsWith('.tgz') ) return 'tar'