def hash_directory(path, root=None, visited=None):
"""Hashes a directory to a 40 hex character string.
"""
h = sha1()
if visited is None:
visited = set()
if os.path.realpath(path) in visited:
raise ValueError("Can't hash directory structure: loop detected at "
"%s" % path)
visited.add(os.path.realpath(path))
if root is None:
root = os.path.realpath(path)
h.update(b'dir\n')
for f in sorted(os.listdir(path)):
pf = os.path.join(path, f)
if os.path.islink(pf):
link = relativize_link(pf, root)
if link is not None:
h.update('link %s %s\n' % (f, sha1(link).hexdigest()))
continue
if os.path.isdir(pf):
if os.path.islink(pf):
warnings.warn("%s is a symbolic link, recursing on target "
"directory" % pf,
UsageWarning)
h.update('dir %s %s\n' % (f, hash_directory(pf, root, visited)))
else:
if os.path.islink(pf):
warnings.warn("%s is a symbolic link, using target file "
"instead" % pf,
UsageWarning)
with open(pf, 'rb') as fd:
h.update('file %s %s\n' % (f, hash_file(fd)))
return h.hexdigest()
def hash_directory(path, root=None, visited=None):
"""Hashes a directory to a 40 hex character string.
"""
h = sha1()
if visited is None:
visited = set()
if os.path.realpath(path) in visited:
raise ValueError("Can't hash directory structure: loop detected at "
"%s" % path)
visited.add(os.path.realpath(path))
if root is None:
root = os.path.realpath(path)
h.update(b'dir\n')
for f in sorted(os.listdir(path)):
pf = os.path.join(path, f)
if os.path.islink(pf):
link = relativize_link(pf, root)
if link is not None:
h.update('link %s %s\n' % (f, sha1(link).hexdigest()))
continue
if os.path.isdir(pf):
if os.path.islink(pf):
warnings.warn(
"%s is a symbolic link, recursing on target "
"directory" % pf, UsageWarning)
h.update('dir %s %s\n' % (f, hash_directory(pf, root, visited)))
else:
if os.path.islink(pf):
warnings.warn(
"%s is a symbolic link, using target file "
"instead" % pf, UsageWarning)
with open(pf, 'rb') as fd:
h.update('file %s %s\n' % (f, hash_file(fd)))
return h.hexdigest()
def hash_file(f):
"""Hashes a file to a 40 hex character SHA1.
"""
h = sha1()
h.update(b'file\n')
for chunk in BufferedReader(f):
h.update(chunk)
return h.hexdigest()
def hash_file(f):
"""Hashes a file to a 40 hex character SHA1.
"""
h = sha1()
h.update(b'file\n')
for chunk in BufferedReader(f):
h.update(chunk)
return h.hexdigest()
def hash_metadata(metadata):
"""Hashes a dictionary of metadata.
"""
assert 'hash' in metadata
metadata = normalize_metadata(metadata)
h = sha1()
for k, v in sorted(metadata.items(), key=lambda p: p[0]):
h.update('%d:%s' % (len(k), k))
if v['type'] == 'int':
h.update('i%de' % v['value'])
else: # v['type'] == 'str':
h.update('%d:%s' % (len(v['value']), v['value']))
return h.hexdigest()
def hash_metadata(metadata):
"""Hashes a dictionary of metadata.
"""
assert 'hash' in metadata
metadata = normalize_metadata(metadata)
h = sha1()
for k, v in sorted(metadata.items(), key=lambda p: p[0]):
h.update('%d:%s' % (len(k), k))
if v['type'] == 'int':
h.update('i%de' % v['value'])
else: # v['type'] == 'str':
h.update('%d:%s' % (len(v['value']), v['value']))
return h.hexdigest()
