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Test all IOU requirements at VM startup

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This allow user to create the node and upload the image after
This commit is contained in:
Julien Duponchelle committed 2015-06-19 16:35:19 +02:00
1 parent 5c4a49a8c7
commit 4aadfa3b67
2 files changed
+27 -23
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gns3server/modules/iou/iou_vm.py
+22 -22
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@@ -142,27 +142,6 @@ class IOUVM(BaseVM):
if os.path.isfile(fix_path):
self._path = fix_path
if not os.path.isfile(self._path) or not os.path.exists(self._path):
if os.path.islink(self._path):
raise IOUError("IOU image '{}' linked to '{}' is not accessible".format(self._path, os.path.realpath(self._path)))
else:
raise IOUError("IOU image '{}' is not accessible".format(self._path))
try:
with open(self._path, "rb") as f:
# read the first 7 bytes of the file.
elf_header_start = f.read(7)
except OSError as e:
raise IOUError("Cannot read ELF header for IOU image '{}': {}".format(self._path, e))
# IOU images must start with the ELF magic number, be 32-bit, little endian
# and have an ELF version of 1 normal IOS image are big endian!
if elf_header_start != b'\x7fELF\x01\x01\x01':
raise IOUError("'{}' is not a valid IOU image".format(self._path))
if not os.access(self._path, os.X_OK):
raise IOUError("IOU image '{}' is not executable".format(self._path))
@property
def use_default_iou_values(self):
"""
@@ -189,9 +168,30 @@ class IOUVM(BaseVM):
def _check_requirements(self):
"""
Checks if IOUYAP executable is available.
Checks if IOUYAP executable is available and if image is accessible.
"""
if not os.path.isfile(self._path) or not os.path.exists(self._path):
if os.path.islink(self._path):
raise IOUError("IOU image '{}' linked to '{}' is not accessible".format(self._path, os.path.realpath(self._path)))
else:
raise IOUError("IOU image '{}' is not accessible".format(self._path))
try:
with open(self._path, "rb") as f:
# read the first 7 bytes of the file.
elf_header_start = f.read(7)
except OSError as e:
raise IOUError("Cannot read ELF header for IOU image '{}': {}".format(self._path, e))
# IOU images must start with the ELF magic number, be 32-bit, little endian
# and have an ELF version of 1 normal IOS image are big endian!
if elf_header_start != b'\x7fELF\x01\x01\x01':
raise IOUError("'{}' is not a valid IOU image".format(self._path))
if not os.access(self._path, os.X_OK):
raise IOUError("IOU image '{}' is not executable".format(self._path))
path = self.iouyap_path
if not path:
raise IOUError("No path to iouyap program has been set")