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"""Bring time stamps of generated checked-in files into the right order
A versioned configuration file .hgtouch specifies generated files, in the
syntax of make rules.
output: input1 input2
In addition to the dependency syntax, #-comments are supported.
"""
import errno
import os
def parse_config(repo):
try:
fp = repo.wfile(".hgtouch")
except IOError, e:
if e.errno != errno.ENOENT:
raise
return {}
result = {}
with fp:
for line in fp:
# strip comments
line = line.split('#')[0].strip()
if ':' not in line:
continue
outputs, inputs = line.split(':', 1)
outputs = outputs.split()
inputs = inputs.split()
for o in outputs:
try:
result[o].extend(inputs)
except KeyError:
result[o] = inputs
return result
def check_rule(ui, repo, modified, output, inputs):
f_output = repo.wjoin(output)
try:
o_time = os.stat(f_output).st_mtime
except OSError:
ui.warn("Generated file %s does not exist\n" % output)
return False
need_touch = False
backdate = None
backdate_source = None
for i in inputs:
f_i = repo.wjoin(i)
try:
i_time = os.stat(f_i).st_mtime
except OSError:
ui.warn(".hgtouch input file %s does not exist\n" % i)
return False
if i in modified:
# input is modified. Need to backdate at least to i_time
if backdate is None or backdate > i_time:
backdate = i_time
backdate_source = i
continue
if o_time <= i_time:
# generated file is older, touch
need_touch = True
if backdate is not None:
ui.warn("Input %s for file %s locally modified\n" % (backdate_source, output))
# set to 1s before oldest modified input
backdate -= 1
os.utime(f_output, (backdate, backdate))
return False
if need_touch:
ui.note("Touching %s\n" % output)
os.utime(f_output, None)
return True
def do_touch(ui, repo):
modified = repo.status()[0]
dependencies = parse_config(repo)
success = True
# try processing all rules in topological order
hold_back = {}
while dependencies:
output, inputs = dependencies.popitem()
# check whether any of the inputs is generated
for i in inputs:
if i in dependencies:
hold_back[output] = inputs
continue
success = check_rule(ui, repo, modified, output, inputs)
# put back held back rules
dependencies.update(hold_back)
hold_back = {}
if hold_back:
ui.warn("Cyclic dependency involving %s\n" % (' '.join(hold_back.keys())))
return False
return success
def touch(ui, repo):
"touch generated files that are older than their sources after an update."
do_touch(ui, repo)
cmdtable = {
"touch": (touch, [],
"touch generated files according to the .hgtouch configuration")
}
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