我想要一个 Mercurial 钩子,它会在提交事务之前运行,如果提交的二进制文件大于 1 兆字节,它将中止事务。我发现以下代码可以正常工作,除了一个问题。如果我的变更集涉及删除文件,则此挂钩将引发异常。
钩子(我正在使用pretxncommit = python:checksize.newbinsize
):
from mercurial import context, util
from mercurial.i18n import _
import mercurial.node as dpynode
'''hooks to forbid adding binary file over a given size
Ensure the PYTHONPATH is pointing where hg_checksize.py is and setup your
repo .hg/hgrc like this:
[hooks]
pretxncommit = python:checksize.newbinsize
pretxnchangegroup = python:checksize.newbinsize
preoutgoing = python:checksize.nopull
[limits]
maxnewbinsize = 10240
'''
def newbinsize(ui, repo, node=None, **kwargs):
'''forbid to add binary files over a given size'''
forbid = False
# default limit is 10 MB
limit = int(ui.config('limits', 'maxnewbinsize', 10000000))
tip = context.changectx(repo, 'tip').rev()
ctx = context.changectx(repo, node)
for rev in range(ctx.rev(), tip+1):
ctx = context.changectx(repo, rev)
print ctx.files()
for f in ctx.files():
fctx = ctx.filectx(f)
filecontent = fctx.data()
# check only for new files
if not fctx.parents():
if len(filecontent) > limit and util.binary(filecontent):
msg = 'new binary file %s of %s is too large: %ld > %ld\n'
hname = dpynode.short(ctx.node())
ui.write(_(msg) % (f, hname, len(filecontent), limit))
forbid = True
return forbid
例外:
$ hg commit -m 'commit message'
error: pretxncommit hook raised an exception: apps/helpers/templatetags/include_extends.py@bced6272d8f4: not found in manifest
transaction abort!
rollback completed
abort: apps/helpers/templatetags/include_extends.py@bced6272d8f4: not found in manifest!
我不熟悉编写 Mercurial 钩子,所以我对发生的事情感到很困惑。如果 hg 已经知道文件被删除,为什么钩子会关心它?有没有办法修复这个钩子,让它一直工作?
更新(已解决): 我修改了钩子以过滤掉在变更集中删除的文件。
def newbinsize(ui, repo, node=None, **kwargs):
'''forbid to add binary files over a given size'''
forbid = False
# default limit is 10 MB
limit = int(ui.config('limits', 'maxnewbinsize', 10000000))
ctx = repo[node]
for rev in xrange(ctx.rev(), len(repo)):
ctx = context.changectx(repo, rev)
# do not check the size of files that have been removed
# files that have been removed do not have filecontexts
# to test for whether a file was removed, test for the existence of a filecontext
filecontexts = list(ctx)
def file_was_removed(f):
"""Returns True if the file was removed"""
if f not in filecontexts:
return True
else:
return False
for f in itertools.ifilterfalse(file_was_removed, ctx.files()):
fctx = ctx.filectx(f)
filecontent = fctx.data()
# check only for new files
if not fctx.parents():
if len(filecontent) > limit and util.binary(filecontent):
msg = 'new binary file %s of %s is too large: %ld > %ld\n'
hname = dpynode.short(ctx.node())
ui.write(_(msg) % (f, hname, len(filecontent), limit))
forbid = True
return forbid