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packaging: be explicit about Python version in rpm spec...
packaging: be explicit about Python version in rpm spec Fedora 31 has Python3 at /usr/bin/python ... but expect everybody to not just find python in $PATH but be explicit about whether they want python2 or python3. mercurial.spec just used 'python' and would fail when it unknowingly used Python 3 and ended up with Mercurial setup.py reporting "Python 3.7 detected." and talking about the HGPYTHON3 environment variable. For now, just be explicit about using system python2 as python executable when building rpms.

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simplemerge
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#!/usr/bin/env python
from __future__ import absolute_import
import getopt
import sys
import hgdemandimport
hgdemandimport.enable()
from mercurial.i18n import _
from mercurial import (
context,
error,
fancyopts,
pycompat,
simplemerge,
ui as uimod,
)
from mercurial.utils import (
procutil,
)
options = [(b'L', b'label', [], _(b'labels to use on conflict markers')),
(b'a', b'text', None, _(b'treat all files as text')),
(b'p', b'print', None,
_(b'print results instead of overwriting LOCAL')),
(b'', b'no-minimal', None, _(b'no effect (DEPRECATED)')),
(b'h', b'help', None, _(b'display help and exit')),
(b'q', b'quiet', None, _(b'suppress output'))]
usage = _(b'''simplemerge [OPTS] LOCAL BASE OTHER
Simple three-way file merge utility with a minimal feature set.
Apply to LOCAL the changes necessary to go from BASE to OTHER.
By default, LOCAL is overwritten with the results of this operation.
''')
class ParseError(Exception):
"""Exception raised on errors in parsing the command line."""
def showhelp():
pycompat.stdout.write(usage)
pycompat.stdout.write(b'\noptions:\n')
out_opts = []
for shortopt, longopt, default, desc in options:
out_opts.append((b'%2s%s' % (shortopt and b'-%s' % shortopt,
longopt and b' --%s' % longopt),
b'%s' % desc))
opts_len = max([len(opt[0]) for opt in out_opts])
for first, second in out_opts:
pycompat.stdout.write(b' %-*s %s\n' % (opts_len, first, second))
try:
for fp in (sys.stdin, pycompat.stdout, sys.stderr):
procutil.setbinary(fp)
opts = {}
try:
bargv = [a.encode('utf8') for a in sys.argv[1:]]
args = fancyopts.fancyopts(bargv, options, opts)
except getopt.GetoptError as e:
raise ParseError(e)
if opts[b'help']:
showhelp()
sys.exit(0)
if len(args) != 3:
raise ParseError(_(b'wrong number of arguments').decode('utf8'))
local, base, other = args
sys.exit(simplemerge.simplemerge(uimod.ui.load(),
context.arbitraryfilectx(local),
context.arbitraryfilectx(base),
context.arbitraryfilectx(other),
**pycompat.strkwargs(opts)))
except ParseError as e:
if pycompat.ispy3:
e = str(e).encode('utf8')
pycompat.stdout.write(b"%s: %s\n" % (sys.argv[0].encode('utf8'), e))
showhelp()
sys.exit(1)
except error.Abort as e:
pycompat.stderr.write(b"abort: %s\n" % e)
sys.exit(255)
except KeyboardInterrupt:
sys.exit(255)