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Tests about metadataonlyctx
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$ hg init
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$ echo A > A
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$ hg commit -A A -m 'Add A'
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$ echo B > B
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$ hg commit -A B -m 'Add B'
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$ hg rm A
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$ echo C > C
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$ echo B2 > B
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$ hg add C -q
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$ hg commit -m 'Remove A'
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$ cat > metaedit.py <<EOF
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> from __future__ import absolute_import
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> from mercurial import context, registrar
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> cmdtable = {}
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> command = registrar.command(cmdtable)
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> @command('metaedit')
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> def metaedit(ui, repo, arg):
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> # Modify commit message to "FOO"
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> with repo.wlock(), repo.lock(), repo.transaction('metaedit'):
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> old = repo['.']
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> kwargs = dict(s.split('=', 1) for s in arg.split(';'))
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> if 'parents' in kwargs:
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> kwargs['parents'] = kwargs['parents'].split(',')
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> new = context.metadataonlyctx(repo, old, **kwargs)
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> new.commit()
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> EOF
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$ hg --config extensions.metaedit=$TESTTMP/metaedit.py metaedit 'text=Changed'
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$ hg log -r tip
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changeset: 3:ad83e9e00ec9
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tag: tip
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parent: 1:3afb7afe6632
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user: test
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date: Thu Jan 01 00:00:00 1970 +0000
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summary: Changed
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$ hg --config extensions.metaedit=$TESTTMP/metaedit.py metaedit 'parents=0' 2>&1 | egrep '^RuntimeError'
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RuntimeError: can't reuse the manifest: its p1 doesn't match the new ctx p1
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$ hg --config extensions.metaedit=$TESTTMP/metaedit.py metaedit 'user=foo <foo@example.com>'
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$ hg log -r tip
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changeset: 4:1f86eaeca92b
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tag: tip
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parent: 1:3afb7afe6632
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user: foo <foo@example.com>
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date: Thu Jan 01 00:00:00 1970 +0000
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summary: Remove A
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