evolve: add an `--update` flag to `hg evolve` command This patch adds a new `--update` flag which defaults to True. The update flag updates the working directory to the head of evolved revisions after `hg evolve` command. This flag can be used to not update your working directory after `hg evolve` which has been one of the biggest feature request from fig team at Google. To not update your working directory, the user can do `hg evolve --no-update`. If the working directory get obsoleted by evolve command, it will update to the successor. This patch also adds some basic tests for the flag introduced.

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# setup config and various utility to test new heads checks on push

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. $TESTDIR/testlib/common.sh

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cat >> $HGRCPATH <<EOF

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[ui]

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# simpler log output

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logtemplate ="{node|short} ({phase}): {desc}\n"

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[phases]

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# non publishing server

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publish=False

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[extensions]

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# we need to strip some changeset for some test cases

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strip=

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evolve=

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EOF

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setuprepos() {

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    echo creating basic server and client repo

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    hg init server

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    cd server

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    mkcommit root

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    hg phase --public .

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    mkcommit A0

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    cd ..

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    hg clone server client

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}