void file_source_read_file(Value* file_source, Value* name, Value* contents)
{
if (file_source_is_map(file_source)) {
Value* entry = hashtable_get(file_source, name);
if (entry == NULL)
set_null(contents);
else
copy(list_get(entry, 1), contents);
return;
}
else if (file_source_is_filesystem_backed(file_source)) {
Value fullPath;
Value* rootDir = list_get(file_source, 1);
copy(rootDir, &fullPath);
join_path(&fullPath, name);
read_text_file(as_cstring(&fullPath), contents);
return;
}
else if (file_source_is_tarball_backed(file_source)) {
Value* tarball = list_get(file_source, 1);
tar_read_file(tarball, as_cstring(name), contents);
return;
}
internal_error("file_source_read_file: file_source type not recognized");
}
static int grub_load_from_tar(void) {
// prepare block api
priv.index = partition_get_index("aboot");
priv.ptn = partition_get_offset(priv.index) + 1024*1024; // 1MB offset to aboot
priv.is_ramdisk = 0;
tio.blksz = BLOCK_SIZE;
tio.lba = partition_get_size(priv.index) / tio.blksz - 1;
// search file
if(tar_get_fileinfo(&tio, "./boot/grub/core.img", &fi)) {
dprintf(CRITICAL, "%s: couldn't find core.img!\n", __func__);
return -1;
}
// load file into RAM
if(tar_read_file(&tio, &fi, (void*)GRUB_LOADING_ADDRESS_VIRT)) {
dprintf(CRITICAL, "%s: couldn't read core.img!\n", __func__);
return -1;
}
grub_bootdev = strdup("hd1");
grub_bootpath = strdup("/boot/grub");
grub_found_tar = 1;
dprintf(INFO, "Loaded GRUB from TAR\n");
return 0;
}
