diff --git a/lib/build.lua b/lib/build.lua
index 3721754..e8218b8 100644
--- a/lib/build.lua
+++ b/lib/build.lua
@@ -11,17 +11,35 @@ end
 
 local function all_loader(paths, ...)
 	local files = { ... };
-	local function coro_entry()
+
+	return coroutine.wrap(function ()
 		for _, f in ipairs(files) do
 			local name = unresolve_require(paths, f);
 			local bytecode = string.dump(assert(load(io.lines(f, 1024), "@" .. f, "t", nil)));
 
 			coroutine.yield(("package.preload[%q] = load(%q, %q, 'b');"):format(name, bytecode, f));
 		end
-		coroutine.yield("require 'init' (...);");
-	end
 
-	return coroutine.wrap(coro_entry);
+		coroutine.yield("require 'init' (...);");
+	end);
+end
+
+local function escape(str)
+	return "\"" .. str:gsub(".", function (c)
+		local b = string.byte(c);
+
+		if c == "\n" then
+			return "\\n";
+		elseif c == "\\" then
+			return "\\\\";
+		elseif c == "\"" then
+			return "\\\"";
+		elseif b >= 32 and b <= 126 then
+			return c;
+		else
+			return ("\\%.3o"):format(b);
+		end
+	end) .. "\"";
 end
 
 local function main(root, out, ...)
@@ -36,13 +54,15 @@ local function main(root, out, ...)
 	local f = assert(io.open(out, "w"));
 	f:write "#include <stdint.h>\n";
 	f:write "#define BYTECODE entry_bytecode\n";
-	f:write "static const uint8_t entry_bytecode[] = { ";
+	f:write "#define BYTECODE_SIZE (sizeof entry_bytecode - 1)\n";
+	f:write "static const uint8_t entry_bytecode[] = ";
 
-	for i = 1, #res do
-		f:write(string.byte(res, i), ", ");
+	for i = 1, math.ceil(#res / 64) do
+		f:write(escape(res:sub((i - 1) * 64 + 1, i * 64)));
+		f:write"\n";
 	end
 
-	f:write "};";
+	f:write ";";
 
 	assert(f:close());
 end
diff --git a/src/errfunc.lua b/lib/errfunc.lua
similarity index 100%
rename from src/errfunc.lua
rename to lib/errfunc.lua
diff --git a/lib/fs.c b/lib/fs.c
new file mode 100644
index 0000000..e78777c
--- /dev/null
+++ b/lib/fs.c
@@ -0,0 +1,125 @@
+#define _GNU_SOURCE
+
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <err.h>
+
+#include "lib.h"
+
+static const char *fs_check_path(lua_State *ctx, int i, size_t *psize) {
+	size_t n;
+	const char *path = luaL_checklstring(ctx, 1, &n);
+
+	size_t real_len = strlen(path);
+	if (n != real_len) {
+		luaL_error(ctx, "path may not contain \\0");
+		return NULL;
+	}
+
+	if (psize) *psize = n;
+
+	return path;
+}
+
+static int lib_fs_mkdir(lua_State *ctx) {
+	size_t path_size;
+	const char *ro_path = fs_check_path(ctx, 1, &path_size);
+	bool recursive = lua_toboolean(ctx, 2);
+
+	if (recursive) {
+		char path[path_size + 1];
+		memcpy(path, ro_path, path_size + 1);
+
+		for (size_t i = 0; i <= path_size ; i++) {
+			if (path[i] == '/' || path[i] == '\0') {
+				path[i] = '\0';
+
+				if (mkdir(path, 0755) < 0 && errno != EEXIST) {
+					lua_pushnil(ctx);
+					lua_pushfstring(ctx, "can't make directory: %s", strerror(errno));
+					return 12;
+				}
+
+				if (i < path_size) path[i] = '/';
+			}
+		}
+	}
+	else {
+		if (mkdir(ro_path, 0755) < 0) {
+			lua_pushnil(ctx);
+			lua_pushfstring(ctx, "can't make directory: %s", strerror(errno));
+			return 12;
+		}
+	}
+
+	lua_pushboolean(ctx, true);
+	return 1;
+}
+static int lib_fs_symlink(lua_State *ctx) {
+	const char *src = fs_check_path(ctx, 1, NULL);
+	const char *dst = fs_check_path(ctx, 2, NULL);
+
+	if (symlink(src, dst) < 0) {
+		lua_pushnil(ctx);
+		lua_pushfstring(ctx, "failed to chmod: %s", strerror(errno));
+		return 2;
+	}
+
+	lua_pushboolean(ctx, true);
+	return 1;
+}
+static int lib_fs_chmod(lua_State *ctx) {
+	const char *path = fs_check_path(ctx, 1, NULL);
+	int mode;
+
+	if (lua_isinteger(ctx, 2)) {
+		mode = lua_tointeger(ctx, 2);
+		mode = mode & 0xFFF;
+	}
+	else {
+		const char *strmode = luaL_checkstring(ctx, 2);
+
+		mode = 0;
+
+		for (size_t i = 0; strmode[i]; i++) {
+			char c = strmode[i];
+			if (c >= '0' && c <= '7') {
+				mode <<= 3;
+				mode |= c - '0';
+			}
+			else {
+				return luaL_error(ctx, "invalid mode '%s' - must be an octal integer", strmode);
+			}
+		}
+	}
+
+	if (chmod(path, mode) < 0) {
+		lua_pushnil(ctx);
+		lua_pushfstring(ctx, "failed to chmod: %s", strerror(errno));
+		return 2;
+	}
+
+	lua_pushboolean(ctx, true);
+	return 1;
+}
+
+int fs_open_lib(lua_State *ctx) {
+	luaL_newlib(ctx, ((luaL_Reg[]) {
+		{ "mkdir", lib_fs_mkdir },
+		{ "chmod", lib_fs_chmod },
+		{ "symlink", lib_fs_symlink },
+		{ NULL, NULL },
+	}));
+
+	return 1;
+}
diff --git a/lib/http.c b/lib/http.c
index 9228391..a12b059 100644
--- a/lib/http.c
+++ b/lib/http.c
@@ -87,6 +87,7 @@ static int lib_http_get(lua_State *ctx) {
 	char *body = body_compress(buff, &size);
 	lua_pushlstring(ctx, body, size);
 	free(body);
+	// fprintf(stderr, "HTTP %s\n", url);
 
 	return 1;
 }
diff --git a/lib/lib.h b/lib/lib.h
index 9c5a6e3..914aae0 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -3,3 +3,4 @@
 int http_open_lib(lua_State *ctx);
 int fmt_open_lib(lua_State *ctx);
 int zlib_open_lib(lua_State *ctx);
+int fs_open_lib(lua_State *ctx);
diff --git a/lib/main.c b/lib/main.c
index 5f459ef..71f2de9 100644
--- a/lib/main.c
+++ b/lib/main.c
@@ -9,108 +9,35 @@
 #include "lib.h"
 
 #ifndef BYTECODE
-	static char entry_bytecode[] = {
-		0x1b, 0x4c, 0x75, 0x61, 0x54, 0x00, 0x19, 0x93,
-		0x0d, 0x0a, 0x1a, 0x0a, 0x04, 0x08, 0x08, 0x78,
-		0x56, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-		0x00, 0x00, 0x00, 0x00, 0x28, 0x77, 0x40, 0x01,
-		0x80, 0x80, 0x80, 0x00, 0x01, 0x02, 0x85, 0x51,
-		0x00, 0x00, 0x00, 0x0b, 0x00, 0x00, 0x00, 0x83,
-		0x80, 0x00, 0x00, 0x44, 0x00, 0x02, 0x01, 0x46,
-		0x00, 0x01, 0x01, 0x82, 0x04, 0x86, 0x65, 0x72,
-		0x72, 0x6f, 0x72, 0x04, 0xa4, 0x70, 0x6c, 0x65,
-		0x61, 0x73, 0x65, 0x2c, 0x20, 0x63, 0x6f, 0x6d,
-		0x70, 0x69, 0x6c, 0x65, 0x20, 0x77, 0x69, 0x74,
-		0x68, 0x20, 0x2d, 0x44, 0x42, 0x59, 0x54, 0x45,
-		0x43, 0x4f, 0x44, 0x45, 0x3d, 0x2e, 0x2e, 0x2e,
-		0x81, 0x01, 0x00, 0x00, 0x80, 0x80, 0x80, 0x80,
-		0x80,
-	};
+	static uint8_t entry_bytecode[] = "error \"bad build\"";
 	#define BYTECODE entry_bytecode
+	#define BYTECODE_SIZE (sizeof entry_bytecode - 1)
 #endif
 
-static char err_bytecode[] = {
-	0x1b, 0x4c, 0x75, 0x61, 0x54, 0x00, 0x19, 0x93,
-	0x0d, 0x0a, 0x1a, 0x0a, 0x04, 0x08, 0x08, 0x78,
-	0x56, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x28, 0x77, 0x40, 0x01,
-	0x80, 0x80, 0x80, 0x00, 0x01, 0x0c, 0xc4, 0x51,
-	0x00, 0x00, 0x00, 0x50, 0x00, 0x00, 0x02, 0x81,
-	0x80, 0x00, 0x80, 0x0b, 0x01, 0x00, 0x00, 0x0e,
-	0x01, 0x02, 0x01, 0x14, 0x81, 0x02, 0x02, 0x03,
-	0x82, 0x01, 0x00, 0x8b, 0x02, 0x00, 0x04, 0x00,
-	0x03, 0x00, 0x00, 0xc4, 0x02, 0x02, 0x02, 0x03,
-	0x83, 0x02, 0x00, 0x44, 0x01, 0x05, 0x01, 0x0b,
-	0x01, 0x00, 0x06, 0x0e, 0x01, 0x02, 0x07, 0x80,
-	0x01, 0x01, 0x00, 0x03, 0x02, 0x04, 0x00, 0x44,
-	0x01, 0x03, 0x02, 0x3c, 0x81, 0x09, 0x00, 0x38,
-	0x17, 0x00, 0x80, 0x8e, 0x01, 0x02, 0x0a, 0x0e,
-	0x02, 0x02, 0x0b, 0x3c, 0x02, 0x0c, 0x00, 0xb8,
-	0x00, 0x00, 0x80, 0x03, 0x82, 0x06, 0x00, 0x38,
-	0x05, 0x00, 0x80, 0x94, 0x82, 0x04, 0x0e, 0x83,
-	0x83, 0x07, 0x00, 0xc4, 0x02, 0x03, 0x02, 0xc2,
-	0x02, 0x00, 0x00, 0xb8, 0x00, 0x00, 0x80, 0x03,
-	0x02, 0x08, 0x00, 0xb8, 0x01, 0x00, 0x80, 0x83,
-	0x82, 0x08, 0x00, 0x00, 0x03, 0x04, 0x00, 0xb5,
-	0x02, 0x02, 0x00, 0x00, 0x02, 0x05, 0x00, 0x8e,
-	0x02, 0x02, 0x12, 0xc0, 0x02, 0x7f, 0x00, 0x38,
-	0x02, 0x00, 0x80, 0x80, 0x02, 0x04, 0x00, 0x03,
-	0x83, 0x09, 0x00, 0x8e, 0x03, 0x02, 0x12, 0xb5,
-	0x02, 0x03, 0x00, 0x00, 0x02, 0x05, 0x00, 0xbc,
-	0x81, 0x09, 0x00, 0xb8, 0x04, 0x00, 0x80, 0x8b,
-	0x02, 0x00, 0x00, 0x8e, 0x02, 0x05, 0x01, 0x94,
-	0x82, 0x05, 0x02, 0x83, 0x03, 0x0a, 0x00, 0x00,
-	0x04, 0x04, 0x00, 0x83, 0x84, 0x0a, 0x00, 0x00,
-	0x05, 0x03, 0x00, 0x83, 0x85, 0x02, 0x00, 0xc4,
-	0x02, 0x07, 0x01, 0x38, 0x03, 0x00, 0x80, 0x8b,
-	0x02, 0x00, 0x00, 0x8e, 0x02, 0x05, 0x01, 0x94,
-	0x82, 0x05, 0x02, 0x83, 0x03, 0x0a, 0x00, 0x00,
-	0x04, 0x04, 0x00, 0x83, 0x84, 0x02, 0x00, 0xc4,
-	0x02, 0x05, 0x01, 0x95, 0x00, 0x01, 0x80, 0xaf,
-	0x00, 0x80, 0x06, 0xb8, 0xe4, 0xff, 0x7f, 0x46,
-	0x00, 0x02, 0x01, 0x46, 0x01, 0x01, 0x01, 0x96,
-	0x04, 0x83, 0x69, 0x6f, 0x04, 0x87, 0x73, 0x74,
-	0x64, 0x65, 0x72, 0x72, 0x04, 0x86, 0x77, 0x72,
-	0x69, 0x74, 0x65, 0x04, 0x92, 0x75, 0x6e, 0x68,
-	0x61, 0x6e, 0x64, 0x6c, 0x65, 0x64, 0x20, 0x65,
-	0x72, 0x72, 0x6f, 0x72, 0x3a, 0x20, 0x04, 0x89,
-	0x74, 0x6f, 0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
-	0x04, 0x82, 0x0a, 0x04, 0x86, 0x64, 0x65, 0x62,
-	0x75, 0x67, 0x04, 0x88, 0x67, 0x65, 0x74, 0x69,
-	0x6e, 0x66, 0x6f, 0x04, 0x84, 0x53, 0x6e, 0x6c,
-	0x00, 0x04, 0x85, 0x6e, 0x61, 0x6d, 0x65, 0x04,
-	0x8a, 0x73, 0x68, 0x6f, 0x72, 0x74, 0x5f, 0x73,
-	0x72, 0x63, 0x04, 0x84, 0x5b, 0x43, 0x5d, 0x04,
-	0x87, 0x61, 0x74, 0x20, 0x3c, 0x43, 0x3e, 0x04,
-	0x85, 0x66, 0x69, 0x6e, 0x64, 0x04, 0x89, 0x25,
-	0x5b, 0x73, 0x74, 0x72, 0x69, 0x6e, 0x67, 0x04,
-	0x8c, 0x61, 0x74, 0x20, 0x3c, 0x73, 0x74, 0x72,
-	0x69, 0x6e, 0x67, 0x3e, 0x04, 0x84, 0x61, 0x74,
-	0x20, 0x04, 0x8c, 0x63, 0x75, 0x72, 0x72, 0x65,
-	0x6e, 0x74, 0x6c, 0x69, 0x6e, 0x65, 0x04, 0x82,
-	0x3a, 0x04, 0x83, 0x20, 0x20, 0x04, 0x85, 0x20,
-	0x69, 0x6e, 0x20, 0x81, 0x01, 0x00, 0x00, 0x80,
-	0x80, 0x80, 0x80, 0x80,
-};
+static char err_bytecode[] =
+	"local err = ...;"
+	"local trace = debug.traceback(nil, 2):match \"^[^\\n]+\\n(.+)$\""
+	"print(table.concat { \"unhandled error: \", err, \"\\n\", trace })";
 
 static void load_modules(lua_State *ctx) {
 	luaL_openlibs(ctx);
 	luaL_requiref(ctx, "http", http_open_lib, false);
 	luaL_requiref(ctx, "fmt", fmt_open_lib, false);
 	luaL_requiref(ctx, "zlib", zlib_open_lib, false);
+	luaL_requiref(ctx, "fs", fs_open_lib, false);
 }
 
 int main(int argc, const char **argv) {
 	lua_State *ctx = luaL_newstate();
 	load_modules(ctx);
 
-	if (luaL_loadbufferx(ctx, err_bytecode, sizeof(err_bytecode), "<main>", "b")) {
+	if (luaL_loadbuffer(ctx, err_bytecode, sizeof err_bytecode - 1, "<main>")) {
 		fprintf(stderr, "error while loading lua bytecode for errfunc: %s", lua_tostring(ctx, -1));
 		return 1;
 	}
 	int errfunc_i = lua_gettop(ctx);
 
-	if (luaL_loadbufferx(ctx, (char*)BYTECODE, sizeof(BYTECODE), "<main>", "b")) {
+	if (luaL_loadbuffer(ctx, (char*)BYTECODE, BYTECODE_SIZE, "<main>")) {
 		fprintf(stderr, "error while loading lua bytecode for main: %s", lua_tostring(ctx, -1));
 		return 1;
 	}
diff --git a/mod/fs.d.lua b/mod/fs.d.lua
new file mode 100644
index 0000000..2d3505c
--- /dev/null
+++ b/mod/fs.d.lua
@@ -0,0 +1,23 @@
+--- @meta fs
+
+local fs = {};
+
+--- @param path string
+--- @param recursive? boolean
+--- @return boolean? ok
+--- @return string? err
+function fs.mkdir(path, recursive) end
+
+--- @param src string
+--- @param dst string
+--- @return boolean? ok
+--- @return string? err
+function fs.symlink(src, dst) end
+
+--- @param path string
+--- @param mode string | integer
+--- @return boolean? ok
+--- @return string? err
+function fs.chmod(path, mode) end
+
+return fs;
diff --git a/src/cli/dump.lua b/src/cli/dump.lua
index 915c7e7..331a8ce 100644
--- a/src/cli/dump.lua
+++ b/src/cli/dump.lua
@@ -1,41 +1,13 @@
 local ostree = require "ostree";
--- TODO: make this an option
-local repo_url = "https://dl.flathub.org/repo";
 
-return function (name, out)
-	local repo = ostree.from_http(repo_url);
+return function (options, name, out)
+	local repo = ostree.from_http(options.repo);
 	local ref = repo:read_ref(name);
 	local commit = repo:read_commit(ref);
 
-	local function dump_file(path, file)
-		print("Dumping " .. path .. "...");
+	local root = repo:read_dir(commit.root);
 
-		local file_obj = repo:read_file(file);
-
-		if file_obj.type == "file" then
-			local f = assert(io.open(out .. "/" .. path, "w"));
-			for seg in file_obj.get_content() do
-				assert(f:write(seg));
-			end
-			f:close();
-		else
-			os.execute(("ln -s %q %q"):format(file_obj.target, out .. "/" .. path));
-		end
-	end
-	local function dump_dir(path, dir)
-		print("Dumping " .. path .. "...");
-		os.execute(("mkdir %q"):format(out .. "/" .. path));
-
-		local dir_obj = repo:read_dir(dir);
-
-		for subname, subdir in pairs(dir_obj.dirs) do
-			dump_dir(path .. "/" .. subname, subdir);
-		end
-
-		for subname, subfile in pairs(dir_obj.files) do
-			dump_file(path .. "/" .. subname, subfile);
-		end
-	end
-
-	dump_dir("/", commit.root);
+	root:recurse(repo, function (path, node)
+		return ostree.dump_node(out .. path, node);
+	end);
 end
diff --git a/src/cli/pack.lua b/src/cli/pack.lua
new file mode 100644
index 0000000..28ab3a9
--- /dev/null
+++ b/src/cli/pack.lua
@@ -0,0 +1,164 @@
+local ostree = require "ostree";
+local flatpak = require "flatpak";
+local fs = require "fs";
+
+local loader = [[#!/bin/sh
+
+set -euo pipefail;
+
+cleanup() {
+	cd /;
+
+	if [ "${mountpoint_dir+x}" ]; then
+		umount "$mountpoint_dir";
+	fi
+	if [ "${squashfs_dir+x}" ]; then
+		umount "$squashfs_dir";
+	fi
+	if [ "${tmp_dir+x}" ]; then
+		rm -rf "$tmp_dir";
+	fi
+}
+
+jail_run() {
+	unshare -cR $mountpoint_dir $@;
+}
+
+trap cleanup EXIT;
+
+marker="#END_OF_"LOADER"_MARKER";
+
+offset=$(( $(grep -abo "$marker" "$PWD/$0" | head -n 1 | cut -d: -f1) + ${#marker} + 1 ));
+
+if [ "${1-}" = "--slimpack-offset" ] || [ "${1-}" = "--appimage-offset" ]; then
+	echo $offset;
+	exit 0;
+fi
+
+tmp_dir=$(mktemp -d /tmp/.slimpack.XXXXXXXXXXXX);
+
+mkdir "$tmp_dir/squashfs";
+squashfuse -o offset=$offset "$PWD/$0" "$tmp_dir/squashfs";
+squashfs_dir="$tmp_dir/squashfs";
+
+mkdir "$tmp_dir/mount_point";
+unionfs -o suid,dev "$squashfs_dir"=RO:/=RW "$tmp_dir/mount_point";
+mountpoint_dir="$tmp_dir/mount_point";
+
+if [ "${1-}" = "--slimpack-dbg" ]; then
+	jail_run /bin/bash;
+elif [ "${1-}" = "--slimpack-dbg-2" ]; then
+	cd "$mountpoint_dir" && bash;
+else
+	jail_run "/entry" $@;
+fi
+exit 0;
+
+#END_OF_LOADER_MARKER
+]];
+
+local entry_preifx = [[#!/bin/sh
+
+export PATH=$PATH:/app/bin
+]];
+
+local function help()
+	print "Slimpack pack help:";
+	print "Subcommand of slimpack, used to repack a flatpak application into";
+	print "an AppImage-like self-contained executable.";
+	print "  --help: Shows this message";
+	print "  --target (-o): Specify the output file. Defaults to 'app'";
+	print "  <arg>: Specifies a package to be converted. At the moment, one may be specified.";
+	print "         in the future however, extensions will be specified as more package refs";
+
+	os.exit();
+end
+
+local function dump_at(repo, name, target)
+	local ref = repo:read_ref(name);
+	local commit = repo:read_commit(ref);
+
+	assert(repo:read_dir(commit.root))
+		:dir(repo, "files")
+		:recurse(repo, function (path, node)
+			print(path);
+			return ostree.dump_node(target .. path, node);
+		end);
+end
+
+local function write_entry(repo, name, target)
+	local meta = flatpak.parse_package(repo, name);
+
+	local f = assert(io.open(target, "wb"));
+	f:write(entry_preifx);
+	f:write(meta.command);
+	f:close();
+	assert(fs.chmod(target, "755"));
+end
+
+local function write_res(img_path, target)
+	local f = assert(io.open(target, "wb"));
+	f:write(loader);
+
+	local img_f = assert(io.open(img_path, "rb"));
+
+	for part in img_f:lines(4096) do
+		f:write(part);
+	end
+
+	img_f:close();
+	f:close();
+	assert(fs.chmod(target, "755"));
+end
+
+return function (options, ...)
+	local target;
+	local name;
+
+	require "util.args" ({
+		function (val)
+			if name then
+				error "only one package may be specified (at the moment)";
+			else
+				name = val;
+				return true;
+			end
+		end,
+		target = function (val)
+			if target then
+				error "target may be specified only once";
+			else
+				target = val;
+				return true;
+			end
+		end,
+		help = help,
+
+		o = "target",
+	}, ...);
+
+	target = target or "./app";
+	if not name then
+		error "package must be specified";
+	end
+
+	local repo = ostree.from_http(options.repo);
+
+	local tmp_dir = assert(io.popen "mktemp -d .pack_XXXXXXXX":read "*a"):sub(1, -2);
+
+	local ok, err = pcall(function ()
+		dump_at(repo, name, tmp_dir .. "/dump/app");
+
+		write_entry(repo, name, tmp_dir .. "/dump/entry");
+
+		-- TODO: replace with C code
+		assert(os.execute(("mksquashfs %q %q"):format(tmp_dir .. "/dump", tmp_dir .. "/img.squashfs")));
+
+		write_res(tmp_dir .. "/img.squashfs", target);
+	end);
+
+	-- TODO: replace with C code
+	os.execute(("rm -rf %q"):format(tmp_dir));
+
+	if not ok then error(err, 0) end
+end
diff --git a/src/cli/query.lua b/src/cli/query.lua
index c962d81..bac94c5 100644
--- a/src/cli/query.lua
+++ b/src/cli/query.lua
@@ -1,28 +1,53 @@
 local ostree = require "ostree";
-local repo_url = "https://dl.flathub.org/repo";
+local flatpak = require "flatpak";
 
 local actions = {};
-function actions.list()
-	local repo = ostree.from_http(repo_url);
+function actions.list(options)
+	local repo = ostree.from_http(options.repo);
 	local index = repo:read_summary_index();
 	local summary = repo:read_subsummary(index.refs.x86_64.checksum);
 
-	for ref in pairs(summary.refs) do
+	for ref in summary.refs do
 		print(ref);
 	end
 end
-function actions.search(term)
-	local repo = ostree.from_http(repo_url);
+function actions.search(options, term)
+	local repo = ostree.from_http(options.repo);
 	local index = repo:read_summary_index();
 	local summary = repo:read_subsummary(index.refs.x86_64.checksum);
 
-	for ref in pairs(summary.refs) do
+	for ref in summary.refs do
 		if ref:lower():match(term:lower(), 1, true) then
 			print(ref);
 		end
 	end
 end
+function actions.info(options, name)
+	local repo = ostree.from_http(options.repo);
+	print(name);
+	local meta = flatpak.parse_package(repo, name);
+	pprint(meta);
 
-return function (action, ...)
-	actions[action](...);
+	print("Name: " .. meta.name);
+	print("Branch: " .. meta.branch);
+	print("Architecture: " .. meta.arch);
+	print("Version: " .. (meta.version or "(not specified)"));
+	print("License: " .. (meta.license or "(not specified)"));
+	print("Summary: " .. (meta.summary or "(not specified)"));
+
+	print("Dependencies:");
+	if meta.deps.debug then
+		print("\tDebug package: " .. meta.deps.debug.name);
+	end
+	if meta.deps.locale then
+		print("\tLocale package: " .. meta.deps.locale.name);
+	end
+	for i = 1, #meta.deps do
+		local dep = meta.deps[i];
+		print("\t" .. dep.name .. (dep.required and "" or " (optional)"));
+	end
+end
+
+return function (options, action, ...)
+	actions[action](options, ...);
 end
diff --git a/src/flatpak.lua b/src/flatpak.lua
new file mode 100644
index 0000000..a0ed609
--- /dev/null
+++ b/src/flatpak.lua
@@ -0,0 +1,105 @@
+local ini = require "formats.ini";
+local xml = require "formats.xml";
+
+local flatpak = {};
+
+--- @param repo ostree
+local function get_metainfo(repo, commit, metadata)
+	local root_dir = repo:read_dir(commit.root);
+
+	local export_dir = root_dir:dir(repo, "export");
+	if export_dir == nil then return nil end
+
+	local share_dir = export_dir:dir(repo, "share");
+	if share_dir == nil then return nil end
+
+	local metainfo_dir = share_dir:dir(repo, "metainfo");
+	if metainfo_dir == nil then return nil end
+
+	local metainfo_ref =
+		metainfo_dir.files[metadata.Application.name .. ".metainfo.xml"] or
+		metainfo_dir.files[metadata.Application.name .. ".appdata.xml"];
+	if metainfo_ref == nil then return nil end
+
+	local metainfo_f = repo:read_file(metainfo_ref);
+
+	local parts = {};
+	for el in metainfo_f:get_content() do parts[#parts + 1] = el end
+	print(table.concat(parts, ""));
+	return xml.parse(table.concat(parts, ""));
+end
+
+--- @param repo ostree
+function flatpak.parse_package(repo, full_name)
+	local ref = repo:read_ref(full_name);
+	local commit = repo:read_commit(ref);
+	local name, arch, branch = full_name:match "^.-/(.-)/(.-)/(.-)$";
+	print(arch, branch);
+
+	local metadata = ini.parse(commit.metadata["xa.metadata"]);
+	local metainfo = get_metainfo(repo, commit, metadata);
+
+	local res = {};
+
+	pprint(metadata);
+
+	res.ref = full_name;
+	res.name = name;
+	res.arch = arch;
+	res.branch = branch;
+
+	res.size = commit.metadata["xa.download-size"];
+	res.command = metadata.Application.command;
+	res.runtime = metadata.Application.runtime;
+	res.deps = {};
+
+	for key, map in pairs(metadata) do
+		local dep = key:match "^Extension%s+(.-)%s*$";
+		if dep then
+			dep = (dep .. "@"):match "^(.-)@";
+
+			local dep_ref = "runtime/" .. dep .. "/" .. arch .. "/" .. (map.version or branch);
+			local required = map["no-autodownload"] ~= "true";
+			local mounts = {};
+
+			if map.directory then
+				mounts[#mounts + 1] = map.directory;
+			elseif map.directories then
+				mounts = ini.parse_list(map.directories);
+			end
+
+			if dep:find "%.Debug$" then
+				res.deps.debug = {
+					name = dep_ref,
+					required = required,
+					mounts = mounts,
+				};
+			elseif dep:find "%.Locale$" then
+				res.deps.locale = {
+					name = dep_ref,
+					required = required,
+					mounts = mounts,
+				};
+			else
+				res.deps[#res.deps + 1] = {
+					name = dep_ref,
+					required = required,
+					mounts = mounts,
+				};
+			end
+
+			pprint(dep, map);
+		end
+	end
+
+	if metainfo then
+		local app_meta = metainfo:get "component";
+		res.version = app_meta:get "releases":get_all "release"[1].attribs.version;
+		res.license = app_meta:get "project_license":text();
+		res.summary = app_meta:get_all "summary"[1]:text();
+	end
+
+	return res, commit;
+end
+
+return flatpak;
diff --git a/src/formats/gvariant.lua b/src/formats/gvariant.lua
index 5b09616..acb9788 100644
--- a/src/formats/gvariant.lua
+++ b/src/formats/gvariant.lua
@@ -1,5 +1,3 @@
--- TODO: remove string.unpack
-
 local fmt = require "fmt";
 
 local uint8_le_fmt = fmt.new "<! I1";
@@ -66,8 +64,10 @@ local function construct_reader_no_cache(str, i)
 		local reader;
 		reader, i = construct_reader_no_cache(str, i + 1);
 		return parsers.maybe(reader), i;
-	elseif c == "a" then
+	elseif c == "a" or c == "l" then
 		i = i + 1;
+		local is_gen = c == "l";
+
 		if str:sub(i, i) == "{" then
 			i = i + 1;
 
@@ -87,7 +87,7 @@ local function construct_reader_no_cache(str, i)
 		else
 			local reader;
 			reader, i = construct_reader_no_cache(str, i);
-			return parsers.array(reader), i;
+			return parsers.array(reader, is_gen), i;
 		end
 	elseif c == "(" then
 		i = i + 1;
@@ -235,10 +235,11 @@ function parsers.array(el_parser, as_iterable)
 			local n = ((e - s + 1) - read_offset(buf, 1)) / offset_size;
 			local curr_s = s;
 
-			-- print(indent, "ARR\t", s, e, n, read_offset(buf, 1));
+			-- print(indent, "ARR\t", s, e, n);
 			-- indent = indent .. "\t";
 
 			assert(not (n % 1 > 0), "offset calculation error");
+			assert(n > 0, "negative array length");
 			n = math.floor(n);
 
 			if as_iterable then
diff --git a/src/formats/ini.lua b/src/formats/ini.lua
index 15b8880..4d91f95 100644
--- a/src/formats/ini.lua
+++ b/src/formats/ini.lua
@@ -1,4 +1,6 @@
-local function parse_ini(raw, glob_group)
+local ini = {};
+
+function ini.parse(raw, glob_group)
 	local lines = {};
 
 	for line in raw:gmatch "[^\n]+" do
@@ -19,8 +21,9 @@ local function parse_ini(raw, glob_group)
 		line_i = line_i + 1;
 		line = line:match "^%s*(.-)%s*$";
 
+
 		if line ~= "" then
-			local group = line.match "^%[%s*(.-)%s*%]$";
+			local group = line:match "^%[%s*(.-)%s*%]$";
 
 			if group ~= nil then
 				curr_group = {};
@@ -28,7 +31,7 @@ local function parse_ini(raw, glob_group)
 			elseif curr_group == nil then
 				error("line " .. line_i .. ": Unexpected global key");
 			else
-				local key, value = line.match "^%s*(.-)%s*=%s*(.-)%s*$";
+				local key, value = line:match "^%s*(.-)%s*=%s*(.-)%s*$";
 				if key == nil then
 					error("line " .. line_i .. ": Unexpected ini syntax");
 				end
@@ -41,7 +44,7 @@ local function parse_ini(raw, glob_group)
 	return groups;
 end
 
-local function parse_ini_list(raw)
+function ini.parse_list(raw)
 	local res = {};
 
 	for el in raw:gmatch "%s*([^;]-)%s*" do
@@ -53,7 +56,4 @@ local function parse_ini_list(raw)
 	return res;
 end
 
-return {
-	parse = parse_ini,
-	list = parse_ini_list,
-};
+return ini;
diff --git a/src/formats/xml.lua b/src/formats/xml.lua
index bf80ac7..dec4761 100644
--- a/src/formats/xml.lua
+++ b/src/formats/xml.lua
@@ -72,7 +72,7 @@ end
 local function parse_tag(raw, i)
 	i = skip_spaces(raw, i);
 
-	local tag = raw:match("^[%w0-9%-]+", i);
+	local tag = raw:match("^[%w0-9%-_:]+", i);
 	if tag == nil then error("expected tag name near '" .. raw:sub(i, i + 25) .. "'") end
 
 	i = i + #tag;
@@ -82,7 +82,7 @@ local function parse_tag(raw, i)
 	while true do
 		i = skip_spaces(raw, i);
 
-		local all, key, _, val = raw:match("^(([%w0-9%-]-)%s*=%s*(['\"])(.-)%3%s*)", i);
+		local all, key, _, val = raw:match("^(([%w0-9%-_:]-)%s*=%s*(['\"])(.-)%3%s*)", i);
 		if all then
 			attribs[key] = val;
 			i = i + #all;
@@ -101,10 +101,15 @@ local function parse_part(raw, i, allow_version)
 		local comment_end;
 
 		if raw:sub(i, i + 3) == "<!--" then
-			i = i + 43;
+			i = i + 4;
+
+			comment_end = raw:find("-->", i);
+			if comment_end then
+				i = comment_end + 3;
+			else
+				i = #raw + 1;
+			end
 
-			_, comment_end = raw:find("-->", i);
-			i = comment_end or #raw;
 			i = skip_spaces(raw, i);
 		end
 	until not comment_end;
@@ -127,7 +132,7 @@ local function parse_part(raw, i, allow_version)
 		i = i + 2;
 		i = skip_spaces(raw, i);
 
-		local tag = raw:match("[%w0-9%-]+", i);
+		local tag = raw:match("[%w0-9%-_:]+", i);
 		if tag == nil then error("expected closing tag name near '" .. raw:sub(i, i + 25) .. "'") end
 
 		i = i + #tag;
@@ -145,7 +150,6 @@ local function parse_part(raw, i, allow_version)
 		local tag;
 		tag, i = parse_tag(raw, i);
 
-
 		if raw:sub(i, i + 1) == "/>" then
 			i = i + 2;
 			return { type = "small", tag = tag.tag, attribs = tag.attribs }, i;
@@ -161,7 +165,10 @@ local function parse_part(raw, i, allow_version)
 		while i <= #raw do
 			local text_end = raw:find("<", i);
 
-			local text_part = raw:sub(i, text_end and text_end - 1 or #raw):match "^%s*(.-)%s*$";
+			local text_part = raw:sub(i, text_end and text_end - 1 or #raw)
+				:match "^%s*(.-)%s*$"
+				:gsub("%s+", " ");
+
 			if text_part ~= "" then
 				text_parts[#text_parts + 1] = text_part;
 			end
@@ -175,8 +182,13 @@ local function parse_part(raw, i, allow_version)
 			if raw:sub(i, i + 3) == "<!--" then
 				i = i + 4;
 
-				_, comment_end = raw:find("-->", i);
-				i = comment_end and comment_end + 1 or #raw;
+				comment_end = raw:find("-->", i);
+				if comment_end then
+					i = comment_end + 3;
+				else
+					i = #raw + 1;
+				end
+
 				i = skip_spaces(raw, i);
 			else
 				break
@@ -210,9 +222,11 @@ local function parse(raw)
 
 		first = false;
 
+		pprint(part);
+
 		if part.type == "text" then
 			if #stack == 1 then
-				error "text may not appear outside a tag";
+				error("text may not appear outside a tag (near '" .. raw:sub(i, i + 25) .. "')");
 			else
 				curr_node[#curr_node + 1] = part.text;
 			end
diff --git a/src/init.lua b/src/init.lua
index 774c540..18eff9e 100644
--- a/src/init.lua
+++ b/src/init.lua
@@ -4,13 +4,53 @@ local actions = {
 	help = require "cli.help",
 	query = require "cli.query",
 	dump = require "cli.dump",
+	pack = require "cli.pack",
 };
 
-return function (action, ...)
-	if action == "--help" or action == "-h" or action == "-help" then
-		return actions.help();
+local function parse_args(...)
+	local options = {};
+	local args = {};
+
+	require "util.args" ({
+		function (arg)
+			if options.action then
+				args[#args + 1] = arg;
+			else
+				options.action = arg;
+			end
+
+			return true, true;
+		end,
+		repo = function (arg)
+			if options.repo ~= nil then
+				error "a repo may be specified only once";
+			else
+				options.repo = arg;
+				return true;
+			end
+		end,
+		help = actions.help,
+	}, ...);
+
+	if not options.action then
+		error "no action specified";
 	end
 
-	return actions[action](...);
+	return options, args;
+end
+
+return function (...)
+	xpcall(
+		function (...)
+			local options, args = parse_args(...);
+			options.repo = options.repo or "https://dl.flathub.org/repo";
+
+			return actions[options.action](options, table.unpack(args));
+		end,
+		function (err)
+			print(table.concat { "unhandled error: ", err, "\n", debug.traceback(nil, 2):match "^[^\n]+\n(.+)$" });
+		end,
+		...
+	);
 end
 
diff --git a/src/ostree.lua b/src/ostree.lua
index 5c574af..7d119a5 100644
--- a/src/ostree.lua
+++ b/src/ostree.lua
@@ -1,6 +1,7 @@
 local gvariant = require "formats.gvariant";
 local fmt = require "fmt";
 local zlib = require "zlib";
+local fs = require "fs";
 
 local header_fmt = fmt.new ">! I4 I4";
 
@@ -42,7 +43,7 @@ local read_header = gvariant "tuuuusa(ayay)";
 --- 	- r: checksum
 --- 	- a{sv}: metadata
 --- - a{sv}: metadata
-local read_summary = gvariant "a{s(tra{sv})}a{sv}";
+local read_summary = gvariant "l(s(tra{sv}))a{sv}";
 
 --- Flatpak-specific format (I think):
 --- - a{s(rara{sv})}: map of architecture name to data about it
@@ -52,6 +53,61 @@ local read_summary = gvariant "a{s(tra{sv})}a{sv}";
 --- - a{sv}: metadata
 local read_summary_index = gvariant "a{s(rara{sv})}a{sv}";
 
+--- @class ostree_file
+--- @field type "file"
+--- @field uid integer
+--- @field gid integer
+--- @field mode integer
+--- @field size integer
+--- @field get_content fun(): fun(): string?
+
+--- @class ostree_link
+--- @field type "link"
+--- @field uid integer
+--- @field gid integer
+--- @field mode integer
+--- @field target string
+
+--- @class ostree_dir
+--- @field type "dir"
+--- @field files { [string]: string }
+--- @field dirs { [string]: { [1]: string, [2]: string } }
+--- @field uid integer
+--- @field gid integer
+--- @field mode integer
+local ostree_dir = {};
+ostree_dir.__index = ostree_dir;
+
+--- @param repo ostree
+--- @param name string
+function ostree_dir:file(repo, name)
+	if self.files[name] == nil then return nil end
+	return repo:read_file(self.files[name]);
+end
+--- @param repo ostree
+--- @param name string
+function ostree_dir:dir(repo, name)
+	if self.dirs[name] == nil then return nil end
+	return repo:read_dir(self.dirs[name]);
+end
+--- @param repo ostree
+--- @param callback fun(path: string, val: ostree_dir | ostree_file | ostree_link)
+function ostree_dir:recurse(repo, callback)
+	local function recurser(self, repo, callback, path)
+		callback(path, self);
+
+		for file, ref in pairs(self.files) do
+			callback(path .. file, repo:read_file(ref));
+		end
+
+		for dir, ref in pairs(self.dirs) do
+			recurser(repo:read_dir(ref), repo, callback, path .. dir .. "/");
+		end
+	end
+
+	return recurser(self, repo, callback, "/");
+end
+
 --- @class ostree
 --- @field reader fun(path: string): string
 local ostree = {};
@@ -119,14 +175,15 @@ function ostree.parse_dir(dir, meta)
 
 	if meta then
 		local uid, gid, mode, xattrs = read_dirmeta(meta);
-		return { type = "dir", files = files, dirs = dirs, uid = uid, gid = gid, mode = mode, xattrs = xattrs };
+		return setmetatable({ type = "dir", files = files, dirs = dirs, uid = uid, gid = gid, mode = mode & 0xFFF, xattrs = xattrs }, ostree_dir);
 	else
-		return { type = "dir", files = files, dirs = dirs };
+		return setmetatable({ type = "dir", files = files, dirs = dirs }, ostree_dir);
 	end
 end
 --- @param data string
+--- @return ostree_file
 function ostree.parse_file(data)
-	local header_size, idk = header_fmt:unpack(data);
+	local header_size = header_fmt:unpack(data);
 	local header = data:sub(9, header_size + 8);
 	local size, uid, gid, mode, rdev, link, xattrs = read_header(header);
 
@@ -139,7 +196,7 @@ function ostree.parse_file(data)
 				target = link,
 				uid = uid,
 				gid = gid,
-				mode = mode,
+				mode = mode & 0xFFF,
 				xattrs = xattrs,
 			};
 		end
@@ -163,7 +220,7 @@ function ostree.parse_file(data)
 			get_content = get_content,
 			uid = uid,
 			gid = gid,
-			mode = mode,
+			mode = mode & 0xFFF,
 			size = size,
 			xattrs = xattrs,
 		};
@@ -173,16 +230,22 @@ end
 function ostree.parse_summary(data)
 	local refs, metadata = read_summary(data);
 
-	for key, val in pairs(refs) do
-		refs[key] = {
-			size = val[1],
-			checksum = val[2],
-			metadata = val[3],
-		};
+	local function refs_iter()
+		local el = refs();
+
+		if el == nil then
+			return nil;
+		else
+			return el[1], {
+				size = el[2][1],
+				checksum = el[2][2],
+				metadata = el[2][3],
+			};
+		end
 	end
 
 	return {
-		refs = refs,
+		refs = refs_iter,
 		metadata = metadata,
 	};
 end
@@ -209,6 +272,31 @@ function ostree.parse_summary_index(data)
 		metadata = metadata,
 	};
 end
+--- @param path string
+--- @param node ostree_dir | ostree_link | ostree_file
+function ostree.dump_node(path, node)
+	if node.type == "dir" then
+		assert(fs.mkdir(path, true));
+		assert(fs.chmod(path, node.mode & 0xFFF));
+	elseif node.type == "file" then
+		assert(fs.mkdir(path:match "^(.+)/[^/]+$", true));
+
+		local f = assert(io.open(path, "w"));
+
+		for seg in node.get_content() do
+			assert(f:write(seg));
+		end
+
+		assert(f:close());
+
+		assert(fs.chmod(path, node.mode & 0xFFF));
+	elseif node.type == "link" then
+		assert(fs.mkdir(path:match "^(.+)/[^/]+$", true));
+		assert(fs.symlink(path, node.target));
+	else
+		error("Unknown node type '" .. node.type .. "'");
+	end
+end
 
 --- @param type string
 --- @param ref string
@@ -223,9 +311,9 @@ end
 --- @param dir string | { [1]: string, [2]?: string }
 --- @param meta? string
 function ostree:read_dir(dir, meta)
-	if type(dir) ~= "strign" then
-		dir = dir[1];
+	if type(dir) ~= "string" then
 		meta = dir[2];
+		dir = dir[1];
 	end
 
 	return ostree.parse_dir(self:read_object("dirtree", dir), meta and self:read_object("dirmeta", meta));
@@ -235,6 +323,7 @@ function ostree:read_file(ref)
 	return ostree.parse_file(self:read_object("filez", ref));
 end
 function ostree:read_summary()
+	print(self.reader("summary"));
 	return ostree.parse_summary(self.reader("summary"));
 end
 function ostree:read_subsummary(ref)
diff --git a/src/util/args.lua b/src/util/args.lua
index 74589aa..af558d6 100644
--- a/src/util/args.lua
+++ b/src/util/args.lua
@@ -1,4 +1,4 @@
----@param consumers table<string, (fun(arg: string): boolean?, boolean?) | string>
+--- @param consumers table<string, (fun(arg: string): boolean?, boolean?) | string>
 --- @param ... string
 --- @returns nil
 return function (consumers, ...)
@@ -6,30 +6,30 @@ return function (consumers, ...)
 	local pass_args = false;
 
 	local function digest_arg(v)
-		local consumed = false;
-
 		while true do
+			--- @type (fun(arg: string): boolean?, boolean?)?
 			local el = table.remove(consumer_stack);
 			if el == nil then break end
 
 			local res, fin = el(v);
-			if res then
-				consumed = true;
-			end
 			if fin then
 				pass_args = true;
-				break;
 			end
 
 			if fin or res then
-				break;
+				return;
 			end
 		end
 
-		if not consumed then
-			if consumers[1](v) then
+		while true do
+			local res, fin = consumers[1](v);
+			if fin then
 				pass_args = true;
 			end
+
+			if res or fin then
+				return;
+			end
 		end
 	end
 
diff --git a/src/util/printing.lua b/src/util/printing.lua
index cd65224..6668c71 100644
--- a/src/util/printing.lua
+++ b/src/util/printing.lua
@@ -1,12 +1,3 @@
-local function escape_str(s)
-	local in_char = { "\\", "\"", "/", "\b", "\f", "\n", "\r", "\t" };
-	local out_char = { "\\", "\"", "/", "b", "f", "n", "r", "t" };
-	for i, c in ipairs(in_char) do
-		s = s:gsub(c, "\\" .. out_char[i]);
-	end
-	return s
-end
-
 local function stringify_impl(obj, indent_str, n, passed)
 	local parts = {};
 	local kind = type(obj);
@@ -17,10 +8,6 @@ local function stringify_impl(obj, indent_str, n, passed)
 
 		local len = #obj;
 
-		for i = 1, len do
-			parts[i] = stringify_impl(obj[i], indent_str, n + 1, passed) .. ",";
-		end
-
 		local keys = {};
 
 		for k, v in pairs(obj) do
@@ -53,7 +40,9 @@ local function stringify_impl(obj, indent_str, n, passed)
 			end
 		end
 
-		local meta = getmetatable(obj);
+		for i = 1, len do
+			parts[#parts + 1] = stringify_impl(obj[i], indent_str, n + 1, passed) .. ",";
+		end
 
 		passed[obj] = false;
 
@@ -76,7 +65,7 @@ local function stringify_impl(obj, indent_str, n, passed)
 
 		return table.concat { "{", contents, "}" };
 	elseif kind == "string" then
-		return "\"" .. escape_str(obj) .. "\"";
+		return ("%q"):format(obj);
 	elseif kind == "function" then
 		local data = debug.getinfo(obj, "S");
 		return table.concat { tostring(obj), " @ ", data.short_src, ":", data.linedefined };