X-Git-Url: http://git.grml.org/?p=grml2usb.git;a=blobdiff_plain;f=grml2usb;h=e2cffe8b7a5b4d3a64ea6c4a8bc95bb5b5272341;hp=075029e5bb2a631e3f49ab7463414f9e2f1bbc48;hb=5755759faac878a451d58d5f642209aab8cb45c7;hpb=f3a85acbbab6bd1f0140bdf8e7496d983a8a7c15

diff --git a/grml2usb b/grml2usb
index 075029e..e2cffe8 100755
--- a/grml2usb
+++ b/grml2usb
@@ -41,6 +41,9 @@ GRML_DEFAULT = None
 UUID = None
 SYSLINUX_LIBS = "/usr/lib/syslinux/"
 
+RE_PARTITION = re.compile(r'([a-z/]*?)(\d+)$')
+RE_P_PARTITION = re.compile(r'(.*?\d+)p(\d+)$')
+RE_LOOP_DEVICE = re.compile(r'/dev/loop\d+$')
 
 def syslinux_warning(option, opt, value, opt_parser):
     """A helper function for printing a warning about deprecated option
@@ -60,10 +63,10 @@ def grub_option(option, opt, value, opt_parser):
     setattr(opt_parser.values, 'syslinux', False)
 
 # cmdline parsing
-USAGE = "Usage: %prog [options] <[ISO[s] | /live/image]> </dev/sdX#>\n\
+USAGE = "Usage: %prog [options] <[ISO[s] | /lib/live/mount/medium]> </dev/sdX#>\n\
 \n\
-%prog installs grml ISO[s] to an USB device to be able to boot from it.\n\
-Make sure you have at least one grml ISO or a running grml system (/live/image),\n\
+%prog installs Grml ISO[s] to an USB device to be able to boot from it.\n\
+Make sure you have at least one Grml ISO or a running Grml system (/lib/live/mount/medium),\n\
 grub or syslinux and root access.\n\
 \n\
 Run %prog --help for usage hints, further information via: man grml2usb"
@@ -108,6 +111,8 @@ parser.add_option("--syslinux", dest="syslinux", action="callback", default=True
                   help="install syslinux bootloader (deprecated as it's the default)")
 parser.add_option("--syslinux-mbr", dest="syslinuxmbr", action="store_true",
                   help="install syslinux master boot record (MBR) instead of default")
+parser.add_option("--tmpdir", dest="tmpdir", default="/tmp",
+                  help="directory to be used for temporary files")
 parser.add_option("--verbose", dest="verbose", action="store_true",
                   help="enable verbose mode")
 parser.add_option("-v", "--version", dest="version", action="store_true",
@@ -126,6 +131,12 @@ class CriticalException(Exception):
     @Exception: message"""
     pass
 
+class VerifyException(Exception):
+    """Throw critical exception if there is an fatal error when verifying something.
+
+    @Exception: message"""
+    pass
+
 
 # The following two functions help to operate on strings as
 # array (list) of bytes (octets). In Python 3000, the bytes
@@ -303,6 +314,20 @@ def check_uid_root():
         sys.exit("Error: please run this script with uid 0 (root).")
 
 
+def check_boot_flag(device):
+    boot_dev, x = get_device_from_partition(device)
+
+    with open(boot_dev, 'r') as image:
+        data = image.read(512)
+        bootcode = data[440:]
+        if bootcode[6] == '\x80':
+            logging.debug("bootflag is enabled")
+        else:
+            logging.debug("bootflag is NOT enabled")
+            raise VerifyException("Device %s does not have the bootflag set. "
+                "Please enable it to be able to boot." % boot_dev)
+
+
 def mkfs_fat16(device):
     """Format specified device with VFAT/FAT16 filesystem.
 
@@ -412,10 +437,7 @@ def install_grub(device):
                 # If using --grub-mbr then make sure we install grub in MBR instead of PBR
                 if options.grubmbr:
                     logging.debug("Using option --grub-mbr ...")
-                    if device[-1:].isdigit():
-                        grub_device = re.match(r'(.*?)\d*$', device).group(1)
-                    else:
-                        grub_device = device
+                    grub_device, x = get_device_from_partition(device)
                 else:
                     grub_device = device
 
@@ -1091,6 +1113,19 @@ def install_iso_files(grml_flavour, iso_mount, device, target):
     proc.wait()
 
 
+def get_device_from_partition(partition):
+    device = partition
+    partition_number = None
+    if partition[-1].isdigit() and not RE_LOOP_DEVICE.match(partition):
+        m = RE_P_PARTITION.match(partition)
+        if not m:
+            m = RE_PARTITION.match(partition)
+        if m:
+            device = m.group(1)
+            partition_number = int(m.group(2)) - 1
+    return (device, partition_number)
+
+
 def get_flavour(flavour_str):
     """Returns the flavour of a grml version string
     """
@@ -1106,8 +1141,16 @@ def identify_grml_flavour(mountpath):
     version_files = search_file('grml-version', mountpath, lst_return=True)
 
     if not version_files:
-        logging.critical("Error: could not find grml-version file.")
-        raise
+        if mountpath.startswith("/lib/live/mount/medium"):
+            logging.critical("Error: could not find grml-version file.")
+            logging.critical("Looks like your system is running from RAM but required files are not available.")
+            logging.critical("Please either boot without toram=... or use boot option toram instead of toram=...")
+            cleanup()
+            sys.exit(1)
+        else:
+            logging.critical("Error: could not find grml-version file.")
+            cleanup()
+            sys.exit(1)
 
     flavours = []
     logging.debug("version_files = %s", version_files)
@@ -1429,7 +1472,7 @@ def install(image, device):
         logging.info("Using %s as install base", image)
     else:
         logging.info("Using ISO %s", image)
-        iso_mountpoint = tempfile.mkdtemp(prefix="grml2usb")
+        iso_mountpoint = tempfile.mkdtemp(prefix="grml2usb", dir=os.path.abspath(options.tmpdir))
         register_tmpfile(iso_mountpoint)
         remove_image_mountpoint = True
         try:
@@ -1452,12 +1495,12 @@ def install(image, device):
 def install_grml(mountpoint, device):
     """Main logic for copying files of the currently running grml system.
 
-    @mountpoin: directory where currently running live system resides (usually /live/image)
+    @mountpoint: directory where currently running live system resides (usually /lib/live/mount/medium)
     @device: partition where the specified ISO should be installed to"""
 
     device_mountpoint = device
     if os.path.isdir(device):
-        logging.info("Specified device is not a directory, therefore not mounting.")
+        logging.info("Specified device is a directory, therefore not mounting.")
         remove_device_mountpoint = False
     else:
         device_mountpoint = tempfile.mkdtemp(prefix="grml2usb")
@@ -1465,7 +1508,11 @@ def install_grml(mountpoint, device):
         remove_device_mountpoint = True
         try:
             check_for_fat(device)
+            check_boot_flag(device)
             mount(device, device_mountpoint, ['-o', 'utf8,iocharset=iso8859-1'])
+        except VerifyException, error:
+            logging.critical("Fatal: %s", error)
+            raise
         except CriticalException, error:
             try:
                 mount(device, device_mountpoint, "")
@@ -1508,12 +1555,9 @@ def handle_mbr(device):
         logging.info("Would install MBR")
         return 0
 
-    if device[-1:].isdigit():
-        mbr_device = re.match(r'(.*?)\d*$', device).group(1)
-        partition_number = int(device[-1:]) - 1
-    else:
+    mbr_device, partition_number = get_device_from_partition(device)
+    if not partition_number:
         logging.warn("Could not detect partition number, not activating partition")
-        partition_number = None
 
     # if we get e.g. /dev/loop1 as device we don't want to put the MBR
     # into /dev/loop of course, therefore use /dev/loop1 as mbr_device
@@ -1661,6 +1705,11 @@ def check_programs():
 
 def load_loop():
     """Runs modprobe loop and throws away it's output"""
+    if not which("modprobe"):
+        logging.critical("Fatal: modprobe not available, can not continue - sorry.")
+        logging.critical("Hint: is /sbin missing in PATH?")
+        sys.exit(1)
+
     proc = subprocess.Popen(["modprobe", "loop"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     proc.wait()