Add core backup mechanism

src/example_config.py

@@ -1,3 +1,10 @@
 PWD_URL = "https://my-domain/ABunchOfRandomCharactersBecauseThisIsNotReallyImportant.file"
+SSH_KEY_PWD_URL = "https://my-domain/ABunchOfRandomCharactersBecauseThisIsNotReallyImportant.file"
 DISK = "/dev/sda"
 MNT_LOCATION = "/mnt"
+
+REMOTE_LOCATION = "192.168.1.5"
+REMOTE_USER = "myuser"
+BACKUP_MAP = [
+    ("/home/remote/MyData", "backup-it-here") # myuser@192.168.1.5:/home/remote/MyData will be backed up to /mnt/{backup-date and "latest"}/backup-it-here
+]

src/main.py

@@ -13,9 +13,12 @@ def log(*args, **kwargs):
 if not os.path.exists(config.DISK):
     log_error(f"Drive {config.DISK} not present on the system")
 
-passwd = requests.get(config.PWD_URL).text
+passwd = requests.get(config.PWD_URL).text.strip()
 log("Got password :", passwd)
 
+ssh_key_passwd = requests.get(config.SSH_KEY_PWD_URL).text.strip()
+log("Got password :", ssh_key_passwd)
+
 
 subprocess.run([
     "cryptsetup", "luksOpen",
@@ -27,7 +30,43 @@ subprocess.call([
     config.MNT_LOCATION
 ])
 
-log("Succesfully mounted, doing the backup stuff")
+log("Successfully mounted, doing the backup stuff")
+
+os.makedirs(
+    os.path.join(config.MNT_LOCATION, "latest"),
+    exist_ok=True
+)
+
+for src, dest in config.BACKUP_MAP:
+    # We could also use a rsync daemon on the remote machine for pwd(-less) auth
+    subprocess.call(
+        [
+            "sshpass", "-P", "passphrase", "-e",
+                "rsync",
+                "-ahz",
+                "--partial",
+                "--delete",
+                "--stats",
+                f"{config.REMOTE_USER}@{config.REMOTE_LOCATION}:{src}",
+                os.path.join(config.MNT_LOCATION, "latest", dest),
+        ],
+        env={**os.environ, "SSHPASS":ssh_key_passwd}
+    )
+
+log("Rsync ok. Creating snapshot.")
+
+subprocess.call([
+    "cp", "-a",
+    "--reflink=always", #! The partition must be Btrfs or XFS
+    os.path.join(config.MNT_LOCATION, "latest"),
+    os.path.join(config.MNT_LOCATION, datetime.today().strftime('%Y-%m-%d'))
+])
+
+log("Snapshot ok. Deleting unneeded backups.")
+
+#TODO
+
+log("Unmounting.")
 
 subprocess.call([
     "umount", config.MNT_LOCATION
@@ -37,3 +76,5 @@ subprocess.call([
     "cryptsetup", "luksClose",
     "/dev/mapper/backup"
 ])
+
+log("Done !")