* Include *all* coreutils as the repertoire of the shell_tool commands.

* Added sorted_glob to return sorted list of globbed files. Needed for
  this script to run on older python 2.3-based systems.
master
wirawan 15 years ago
parent dfc7a780f9
commit 599401a543
  1. 71
      shell_tools.py

@ -1,4 +1,4 @@
# $Id: shell_tools.py,v 1.4 2010-01-20 21:27:41 wirawan Exp $
# $Id: shell_tools.py,v 1.5 2010-02-08 19:57:35 wirawan Exp $
#
# wpylib.shell_tools
# Created: 20100106
@ -8,6 +8,7 @@
# scripts.
#
import glob
import os
import os.path
import sys
@ -26,7 +27,7 @@ def mcd(subdir):
os.chdir(subdir)
def provide_file(dest, src):
def provide_link(dest, src):
"""Checks if file `dest' exists. If it does not, provide for it by means
of a softlink from `src'."""
if not os.path.exists(dest):
@ -34,6 +35,41 @@ def provide_file(dest, src):
os.symlink(src, dest.rstrip("/"))
# Globbing utilities:
def sorted_glob(pathname):#, cmp=None, key=None, reverse=None):
"""Returns a sorted list of file names matching glob pattern `pathname'.
Added here to accomodate older python that do not have sorted() function."""
rslt = glob.glob(pathname)
rslt.sort() #cmp=cmp, key=key, reverse=reverse)
return rslt
# Environment variable utilities:
def env_push(name, new_value):
"""Temporarily modifies the value of an environment variable; saving the
original one in the function return value.
The original value can be restored to the environment variable by calling
env_pop.
Example:
oldpath = push_env('TOOL_HELPER', '/usr/bin/less')
execvp(os.P_WAIT, 'some_tool', ('some_tool', 'some_arg'))
pop_env('TOOL_HELPER', oldpath)
"""
old_value = os.environ.get(name, None)
os.environ[name] = new_value
return old_value
def env_pop(name, old_value):
"""Restores the original value of an environment variable that was modified
temporarily by env_push."""
if old_value == None:
del os.environ[name]
else:
os.environ[name] = old_value
# Low-level utilities:
def errchk(cmd, args, retcode):
@ -111,9 +147,38 @@ else:
# coreutils
coreutils = """
base64 basename
cat chcon chgrp chmod chown cksum comm cp csplit cut
date dd df dir dircolors dirname du
echo env expand expr
factor false fmt fold
groups
head hostid
id install
join
link
ln logname ls
md5sum mkdir mkfifo mknod mv
nice nl nohup
od
paste pathchk pinky pr printenv printf ptx pwd
readlink rm rmdir runcon
seq sha1sum sha224sum sha256sum sha384sum sha512sum shred shuf sleep sort split stat stty sum sync
tac tail tee test touch touch tr true tsort tty
uname unexpand uniq unlink users
vdir
wc who whoami
yes
""".split()
# and other common utilities
CMD = ['cat', 'cp', 'head', 'grep', 'less', 'ls', 'mkdir', 'mv', 'rm', 'tail']
CMD = coreutils
CMD += [ 'grep', 'less' ]
CMD += [ 'sh', 'bash' ]
CMD += [ 'gawk', 'sed', ]
CMD_NAME = {}
for n in CMD:
CMD_NAME[n] = n

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