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Do not clobber real files when creating a patch

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When a file unpacked from a crate is edited, it is OK to edit it
directly. But when editing something that was already there, we should
make a temporary copy. Let's do this copy next to the file being
edited, so it's easy for the user to open related files.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2018-08-13 17:52:53 +02:00
parent 2233404f98
commit 3637450520
1 changed files with 16 additions and 4 deletions
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20
rust2rpm/__main__.py
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@ -131,7 +131,7 @@ def toml_from_crate(cratef, crate, version):
raise IOError('crate does not contain Cargo.toml file')
yield toml
def make_patch(toml, enabled=True):
def make_patch(toml, enabled=True, tmpfile=False):
if not enabled:
return []
@ -139,9 +139,21 @@ def make_patch(toml, enabled=True):
mtime_before = file_mtime(toml)
toml_before = open(toml).readlines()
subprocess.check_call([editor, toml])
# When we are editing a git checkout, we should not modify the real file.
# When we are editing an unpacked crate, we are free to edit anything.
# Let's keep the file name as close as possible to make editing easier.
if tmpfile:
tmpfile = tempfile.NamedTemporaryFile('w+t', dir=os.path.dirname(toml),
prefix='Cargo.', suffix='.toml')
tmpfile.writelines(toml_before)
tmpfile.flush()
fname = tmpfile.name
else:
fname = toml
subprocess.check_call([editor, fname])
mtime_after = file_mtime(toml)
toml_after = open(toml).readlines()
toml_after = open(fname).readlines()
toml_relpath = '/'.join(toml.split('/')[-2:])
diff = list(difflib.unified_diff(toml_before, toml_after,
fromfile=toml_relpath, tofile=toml_relpath,
@ -158,7 +170,7 @@ def make_diff_metadata(crate, version, patch=False):
cratef, crate, version = local_crate(crate, version)
else:
toml, crate, version = local_toml(crate, version)
diff = make_patch(toml, enabled=patch)
diff = make_patch(toml, enabled=patch, tmpfile=True)
metadata = Metadata.from_file(toml)
return metadata.name, diff, metadata
else: