apenwarr-redo/vars_init.py
Avery Pennarun fb388b3dde Automatically select a good shell instead of relying on /bin/sh.
This includes a fairly detailed test of various known shell bugs from the
autoconf docs.

The idea here is that if redo works on your system, you should be able to
rely on a *good* shell to run your .do files; you shouldn't have to work
around zillions of bugs like autoconf does.
2010-12-21 04:44:39 -08:00

34 lines
1.3 KiB
Python

import sys, os
def init(targets):
if not os.environ.get('REDO'):
# toplevel call to redo
exenames = [os.path.abspath(sys.argv[0]),
os.path.realpath(sys.argv[0])]
dirnames = [os.path.dirname(p) for p in exenames]
trynames = ([os.path.abspath(p+'/../lib/redo') for p in dirnames] +
[p+'/redo-sh' for p in dirnames] +
dirnames)
seen = {}
dirs = []
for k in trynames:
if not seen.get(k) and os.path.exists('%s/.' % k):
seen[k] = 1
dirs.append(k)
os.environ['PATH'] = ':'.join(dirs) + ':' + os.environ['PATH']
os.environ['REDO'] = os.path.abspath(sys.argv[0])
if not os.environ.get('REDO_BASE'):
base = os.path.commonprefix([os.path.abspath(os.path.dirname(t))
for t in targets] + [os.getcwd()])
bsplit = base.split('/')
for i in range(len(bsplit)-1, 0, -1):
newbase = '/'.join(bsplit[:i])
if os.path.exists(newbase + '/.redo'):
base = newbase
break
os.environ['REDO_BASE'] = base
os.environ['REDO_STARTDIR'] = os.getcwd()
import state
state.init()