mirror of
https://github.com/Pardus-LiderAhenk/ahenk
synced 2024-11-15 00:52:16 +03:00
87 lines
2.5 KiB
Python
87 lines
2.5 KiB
Python
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import os
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import sys
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import tempfile
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sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__))))
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from line import Line
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class Fstab(object):
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"""An /etc/fstab file."""
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def __init__(self):
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self.lines = []
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def open_file(self, filespec, mode):
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if isinstance(filespec, str):
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return open(filespec, mode=mode)
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else:
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return filespec
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def close_file(self, f, filespec):
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if isinstance(filespec, str):
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f.close()
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def get_perms(self, filename):
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return os.stat(filename).st_mode # pragma: no cover
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def chmod_file(self, filename, mode):
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os.chmod(filename, mode) # pragma: no cover
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def link_file(self, oldname, newname):
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if os.path.exists(newname):
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os.remove(newname)
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os.link(oldname, newname)
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def rename_file(self, oldname, newname):
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os.rename(oldname, newname) # pragma: no cover
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def read(self, filespec):
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"""Read in a new file.
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If filespec is a string, it is used as a filename. Otherwise
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it is used as an open file.
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The existing content is replaced.
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"""
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f = self.open_file(filespec, "r")
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lines = []
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for line in f:
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lines.append(Line(line))
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self.lines = lines
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self.close_file(filespec, f)
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def write(self, filespec):
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"""Write out a new file.
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If filespec is a string, it is used as a filename. Otherwise
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it is used as an open file.
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"""
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if isinstance(filespec, str):
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# We create the temporary file in the directory (/etc) that the
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# file exists in. This is so that we can do an atomic rename
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# later, and that only works inside one filesystem. Some systems
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# have /tmp and /etc on different filesystems, for good reasons,
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# and we need to support that.
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dirname = os.path.dirname(filespec)
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prefix = os.path.basename(filespec) + "."
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fd, tempname = tempfile.mkstemp(dir=dirname, prefix=prefix)
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os.close(fd)
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else:
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tempname = filespec
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f = self.open_file(tempname, "w")
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for line in self.lines:
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f.write(line.raw)
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self.close_file(filespec, f)
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if isinstance(filespec, str):
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self.chmod_file(tempname, self.get_perms(filespec))
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self.link_file(filespec, filespec + ".bak")
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self.rename_file(tempname, filespec)
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