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redo-stamp: print a helpful message if stdin is a tty.

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Otherwise your redo process might just freeze in the middle, and you'll
wonder why.
This commit is contained in:
Avery Pennarun 2010-12-11 18:13:58 -08:00
commit 2706525fc0
1 changed files with 9 additions and 1 deletions
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10
redo-stamp.py
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@ -7,6 +7,10 @@ if len(sys.argv) > 1:
err('%s: no arguments expected.\n' % sys.argv[0]) err('%s: no arguments expected.\n' % sys.argv[0])
sys.exit(1) sys.exit(1)
if os.isatty(0):
err('%s: you must provide the data to stamp on stdin\n' % sys.argv[0])
sys.exit(1)
# hashlib is only available in python 2.5 or higher, but the 'sha' module # hashlib is only available in python 2.5 or higher, but the 'sha' module
# produces a DeprecationWarning in python 2.6 or higher. We want to support # produces a DeprecationWarning in python 2.6 or higher. We want to support
# python 2.4 and above without any stupid warnings, so let's try using hashlib # python 2.4 and above without any stupid warnings, so let's try using hashlib
@ -24,8 +28,12 @@ while 1:
sh.update(b) sh.update(b)
if not b: break if not b: break
f = state.File(name=vars.TARGET)
csum = sh.hexdigest() csum = sh.hexdigest()
if not vars.TARGET:
sys.exit(0)
f = state.File(name=vars.TARGET)
changed = (csum != f.csum) changed = (csum != f.csum)
debug2('%s: old = %s\n' % (f.name, f.csum)) debug2('%s: old = %s\n' % (f.name, f.csum))
debug2('%s: sum = %s (%s)\n' % (f.name, csum, debug2('%s: sum = %s (%s)\n' % (f.name, csum,