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'newer_group()' can now deal with missing files, in a way specified by

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the 'missing' parameter.
This commit is contained in:
Greg Ward 2000-01-09 22:48:59 +00:00
parent c9f3187be2
commit 7b7679eb79
1 changed files with 17 additions and 2 deletions
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19
Lib/distutils/util.py
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@ -120,11 +120,18 @@ def newer_pairwise (sources, targets):
# newer_pairwise ()
def newer_group (sources, target):
def newer_group (sources, target, missing='error'):
"""Return true if 'target' is out-of-date with respect to any
file listed in 'sources'. In other words, if 'target' exists and
is newer than every file in 'sources', return false; otherwise
return true."""
return true. 'missing' controls what we do when a source file is
missing; the default ("error") is to blow up with an OSError from
inside 'stat()'; if it is "ignore", we silently drop any missing
source files; if it is "newer", any missing source files make us
assume that 'target' is out-of-date (this is handy in "dry-run"
mode: it'll make you pretend to carry out commands that wouldn't
work because inputs are missing, but that doesn't matter because
you're not actually going to run the commands)."""
# If the target doesn't even exist, then it's definitely out-of-date.
if not os.path.exists (target):
@ -137,6 +144,14 @@ def newer_group (sources, target):
from stat import ST_MTIME
target_mtime = os.stat (target)[ST_MTIME]
for source in sources:
if not os.path.exists (source):
if missing == 'error': # blow up when we stat() the file
pass
elif missing == 'ignore': # missing source dropped from
continue # target's dependency list
elif missing == 'newer': # missing source means target is
return 1 # out-of-date
source_mtime = os.stat(source)[ST_MTIME]
if source_mtime > target_mtime:
return 1