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perl: add write permissions to update config files (#5746)

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Perl installs a couple of config files that need to be munged so that
they don't refer to the spack compiler.  These files are installed
read-only.  Behind the scenes 'filter_file' moves its file to a safe
place, and tries to create a working file that is both O_WRONLY and
has the perms of the original file.  On an NFSv4 filesystem, the
combination of 'r--r--r--' and O_WRONLY throws a permissions error.

This commit adds a simple context manager that temporarily makes the
files writable.
This commit is contained in:
George Hartzell 2017-10-17 18:38:23 -07:00 committed by scheibelp
parent 464e558aea
commit ad5fb40d75
1 changed files with 23 additions and 10 deletions
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33
var/spack/repos/builtin/packages/perl/package.py
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@ -32,6 +32,7 @@
#
from spack import *
import os
from contextlib import contextmanager
class Perl(Package): # Perl doesn't use Autotools, it should subclass Package
@ -186,7 +187,9 @@ def setup_dependent_package(self, module, dependent_spec):
def filter_config_dot_pm(self):
"""Run after install so that Config.pm records the compiler that Spack
built the package with. If this isn't done, $Config{cc} will
be set to Spack's cc wrapper script.
be set to Spack's cc wrapper script. These files are read-only, which
frustrates filter_file on some filesystems (NFSv4), so make them
temporarily writable.
"""
kwargs = {'ignore_absent': True, 'backup': False, 'string': False}
@ -196,18 +199,28 @@ def filter_config_dot_pm(self):
config_dot_pm = perl('-MModule::Loaded', '-MConfig', '-e',
'print is_loaded(Config)', output=str)
match = 'cc *=>.*'
substitute = "cc => '{cc}',".format(cc=self.compiler.cc)
filter_file(match, substitute, config_dot_pm, **kwargs)
with self.make_briefly_writable(config_dot_pm):
match = 'cc *=>.*'
substitute = "cc => '{cc}',".format(cc=self.compiler.cc)
filter_file(match, substitute, config_dot_pm, **kwargs)
# And the path Config_heavy.pl
d = os.path.dirname(config_dot_pm)
config_heavy = join_path(d, 'Config_heavy.pl')
match = '^cc=.*'
substitute = "cc='{cc}'".format(cc=self.compiler.cc)
filter_file(match, substitute, config_heavy, **kwargs)
with self.make_briefly_writable(config_heavy):
match = '^cc=.*'
substitute = "cc='{cc}'".format(cc=self.compiler.cc)
filter_file(match, substitute, config_heavy, **kwargs)
match = '^ld=.*'
substitute = "ld='{ld}'".format(ld=self.compiler.cc)
filter_file(match, substitute, config_heavy, **kwargs)
match = '^ld=.*'
substitute = "ld='{ld}'".format(ld=self.compiler.cc)
filter_file(match, substitute, config_heavy, **kwargs)
@contextmanager
def make_briefly_writable(self, path):
"""Temporarily make a file writable, then reset"""
perm = os.stat(path).st_mode
os.chmod(path, perm | 0o200)
yield
os.chmod(path, perm)