probe: detect 64 bit operating systems

OpenGnsys partition images store OS information, including
the OS name appended with "64 bits" when the OS is meant for 64 bit
machines.

The detected OS name when probing (refresh) is important, if it differs
from what's stored in the DB OpenGnsys will wipe last image restored
information when running a refresh.

See actualizaConfiguracion from legacy ogserver (ogAdmServer.c) code:

	dato = dbi_result_get_uint(result, "idnombreso");
	if (idsoi == dato) {
		swu = false;
	}
	...
	if (swu) {
		result_update = dbi_conn_queryf(dbi->conn,
		"UPDATE ordenadores_particiones SET "
			" codpar=0x%s,"
			" tamano=%s,"
			" uso=%s,"
			" idsistemafichero=%d,"
			" idnombreso=%d,"
			" idimagen=0,"
			" idperfilsoft=0,"
			" fechadespliegue=NULL"
			" WHERE idordenador=%d AND numdisk=%s AND numpar=%s",

src/utils/fs.py

@@ -14,6 +14,16 @@ from subprocess import DEVNULL
 import psutil
 
 
+def find_mountpoint(path):
+    """
+    Returns mountpoint of a given path
+    """
+    path = os.path.abspath(path)
+    while not os.path.ismount(path):
+        path = os.path.dirname(path)
+    return path
+
+
 def mount_mkdir(source, target):
     """
     Mounts and creates the mountpoint directory if it's not present.

src/utils/probe.py

@@ -8,15 +8,20 @@
 
 import os
 import subprocess
+import platform
 
 from subprocess import PIPE
 
+from src.utils.fs import find_mountpoint
+
 def getlinuxversion(osrelease):
     """
     Parses a os-release file to fetch 'PRETTY_NAME' key.
     If file or key are not found, then returns generic
     'Linux' string.
     """
+    mountpoint = find_mountpoint(osrelease)
+
     with open(osrelease, 'r') as f:
         for line in f:
             if line.find('=') == -1:
@@ -25,7 +30,8 @@ def getlinuxversion(osrelease):
             if key == 'PRETTY_NAME':
                 value = value.replace('\n', '')
                 value = value.strip('"')
-                return value
+                bits = ' 64 bits' if linux_is64bit(mountpoint) else ''
+                return f'{value}{bits}'
         return 'Linux'
 
 
@@ -54,14 +60,52 @@ def getwindowsversion(winreghives):
 
         prodname = proc_prodname.stdout.decode().replace('\n', '')
         releaseid = proc_releaseid.stdout.decode().replace('\n', '')
+        bits = ' 64 bits' if windows_is64bit(winreghives) else ''
 
         if proc_prodname.returncode == 0 and proc_releaseid.returncode == 0:
-            return f'{prodname} {releaseid}'
+            return f'{prodname} {releaseid}{bits}'
     except FileNotFoundError:  # hivexget command not found
         pass
     return 'Microsoft Windows'
 
 
+def windows_is64bit(winreghives):
+    """
+    Check for 64 bit Windows by means of retrieving the value of
+    ProgramW6432Dir. This key is set if Windows is running 64 bit.
+
+    If set returns True.
+    If not set or hivexget exits with non-zero, returns False.
+    """
+    try:
+        proc_hivexget = subprocess.run(['hivexget',
+            f'{winreghives}/SOFTWARE',
+            'Microsoft\Windows\CurrentVersion',
+            'ProgramW6432Dir'], stdout=PIPE)
+        stdout = proc_hivexget.stdout.decode().replace('\n', '')
+
+        if proc_hivexget.returncode == 0 and stdout:
+            return True
+    except FileNotFoundError:  # hivexget command not found
+        pass
+    return False
+
+
+def linux_is64bit(mountpoint):
+    """
+    If /sbin/init is detected, check if compiled for 64-bit machine.
+
+    If init executable is not found, check for /lib64.
+    If /lib64 is found returns True, otherwise False.
+    """
+    init_path = f'{mountpoint}/sbin/init'
+    lib64_path = f'{mountpoint}/lib64'
+    if os.path.exists(init_path):
+        bits, linkage = platform.architecture(executable=init_path)
+        return True if bits == '64bit' else False
+    return os.path.exists(lib64_path)
+
+
 def cache_probe():
     """
     Runs 'blkid -L CACHE' and returns stripped stdout