1 // Copyright © 2020 Intel Corporation 2 // 3 // SPDX-License-Identifier: Apache-2.0 4 5 #[cfg(all(target_arch = "x86_64", feature = "guest_debug"))] 6 use crate::coredump::GuestDebuggableError; 7 use crate::{config::VmConfig, vm::VmSnapshot}; 8 use anyhow::anyhow; 9 use std::fs::File; 10 use std::io::BufReader; 11 use std::path::PathBuf; 12 use vm_migration::{MigratableError, Snapshot}; 13 14 pub const SNAPSHOT_STATE_FILE: &str = "state.json"; 15 pub const SNAPSHOT_CONFIG_FILE: &str = "config.json"; 16 17 pub fn url_to_path(url: &str) -> std::result::Result<PathBuf, MigratableError> { 18 let path: PathBuf = url 19 .strip_prefix("file://") 20 .ok_or_else(|| { 21 MigratableError::MigrateSend(anyhow!("Could not extract path from URL: {}", url)) 22 }) 23 .map(|s| s.into())?; 24 25 if !path.is_dir() { 26 return Err(MigratableError::MigrateSend(anyhow!( 27 "Destination is not a directory" 28 ))); 29 } 30 31 Ok(path) 32 } 33 34 #[cfg(all(target_arch = "x86_64", feature = "guest_debug"))] 35 pub fn url_to_file(url: &str) -> std::result::Result<PathBuf, GuestDebuggableError> { 36 let file: PathBuf = url 37 .strip_prefix("file://") 38 .ok_or_else(|| { 39 GuestDebuggableError::Coredump(anyhow!("Could not extract file from URL: {}", url)) 40 }) 41 .map(|s| s.into())?; 42 43 Ok(file) 44 } 45 46 pub fn recv_vm_config(source_url: &str) -> std::result::Result<VmConfig, MigratableError> { 47 let mut vm_config_path = url_to_path(source_url)?; 48 49 vm_config_path.push(SNAPSHOT_CONFIG_FILE); 50 51 // Try opening the snapshot file 52 let vm_config_file = 53 File::open(vm_config_path).map_err(|e| MigratableError::MigrateSend(e.into()))?; 54 let vm_config_reader = BufReader::new(vm_config_file); 55 serde_json::from_reader(vm_config_reader).map_err(|e| MigratableError::MigrateReceive(e.into())) 56 } 57 58 pub fn recv_vm_state(source_url: &str) -> std::result::Result<Snapshot, MigratableError> { 59 let mut vm_state_path = url_to_path(source_url)?; 60 61 vm_state_path.push(SNAPSHOT_STATE_FILE); 62 63 // Try opening the snapshot file 64 let vm_state_file = 65 File::open(vm_state_path).map_err(|e| MigratableError::MigrateSend(e.into()))?; 66 let vm_state_reader = BufReader::new(vm_state_file); 67 serde_json::from_reader(vm_state_reader).map_err(|e| MigratableError::MigrateReceive(e.into())) 68 } 69 70 pub fn get_vm_snapshot(snapshot: &Snapshot) -> std::result::Result<VmSnapshot, MigratableError> { 71 if let Some(snapshot_data) = snapshot.snapshot_data.as_ref() { 72 return snapshot_data.to_state(); 73 } 74 75 Err(MigratableError::Restore(anyhow!( 76 "Could not find VM config snapshot section" 77 ))) 78 } 79