tests/test-hook

support hooks written in python.

to write hook in python, create module with hook function inside.
make sure mercurial can import module (put it in $PYTHONPATH or load it
as extension).  hook function should look like this:

def myhook(ui, repo, hooktype, **kwargs):
   if hook_passes:
      return True
   elif hook_explicitly_fails:
      return False
   elif some_other_failure:
      import util
      raise util.Abort('helpful failure message')
   else:
      return
      # implicit return of None makes hook fail!

then in .hgrc, add hook with "python:" prefix:

[hooks]
commit = python:mymodule.myhook

#!/bin/sh

# commit hooks can see env vars
hg init a
cd a
echo "[hooks]" > .hg/hgrc
echo 'commit = echo commit hook: n=$HG_NODE p1=$HG_PARENT1 p2=$HG_PARENT2' >> .hg/hgrc
echo 'commit.b = echo commit hook b' >> .hg/hgrc
echo 'precommit = echo precommit hook: p1=$HG_PARENT1 p2=$HG_PARENT2' >> .hg/hgrc
echo 'pretxncommit = echo pretxncommit hook: n=$HG_NODE p1=$HG_PARENT1 p2=$HG_PARENT2; hg -q tip' >> .hg/hgrc
echo a > a
hg add a
hg commit -m a -d "1000000 0"

hg clone . ../b
cd ../b

# changegroup hooks can see env vars
echo '[hooks]' > .hg/hgrc
echo 'prechangegroup = echo prechangegroup hook' >> .hg/hgrc
echo 'changegroup = echo changegroup hook: n=$HG_NODE' >> .hg/hgrc
echo 'incoming = echo incoming hook: n=$HG_NODE' >> .hg/hgrc

# pretxncommit and commit hooks can see both parents of merge
cd ../a
echo b >> a
hg commit -m a1 -d "1 0"
hg update -C 0
echo b > b
hg add b
hg commit -m b -d '1 0'
hg update -m 1
hg commit -m merge -d '2 0'

cd ../b
hg pull ../a

# tag hooks can see env vars
cd ../a
echo 'pretag = echo pretag hook: t=$HG_TAG n=$HG_NODE l=$HG_LOCAL' >> .hg/hgrc
echo 'tag = echo tag hook: t=$HG_TAG n=$HG_NODE l=$HG_LOCAL' >> .hg/hgrc
hg tag -d '3 0' a
hg tag -l la

# pretag hook can forbid tagging
echo 'pretag.forbid = echo pretag.forbid hook; exit 1' >> .hg/hgrc
hg tag -d '4 0' fa
hg tag -l fla

# pretxncommit hook can see changeset, can roll back txn, changeset
# no more there after
echo 'pretxncommit.forbid = echo pretxncommit.forbid hook: tip=`hg -q tip`; exit 1' >> .hg/hgrc
echo z > z
hg add z
hg -q tip
hg commit -m 'fail' -d '4 0'
hg -q tip

# precommit hook can prevent commit
echo 'precommit.forbid = echo precommit.forbid hook; exit 1' >> .hg/hgrc
hg commit -m 'fail' -d '4 0'
hg -q tip

# prechangegroup hook can prevent incoming changes
cd ../b
hg -q tip
echo '[hooks]' > .hg/hgrc
echo 'prechangegroup.forbid = echo prechangegroup.forbid hook; exit 1' >> .hg/hgrc
hg pull ../a

# pretxnchangegroup hook can see incoming changes, can roll back txn,
# incoming changes no longer there after
echo '[hooks]' > .hg/hgrc
echo 'pretxnchangegroup.forbid = echo pretxnchangegroup.forbid hook: tip=`hg -q tip`; exit 1' >> .hg/hgrc
hg pull ../a
hg -q tip

# outgoing hooks can see env vars
rm .hg/hgrc
echo '[hooks]' > ../a/.hg/hgrc
echo 'preoutgoing = echo preoutgoing hook: s=$HG_SOURCE' >> ../a/.hg/hgrc
echo 'outgoing = echo outgoing hook: n=$HG_NODE s=$HG_SOURCE' >> ../a/.hg/hgrc
hg pull ../a
hg undo

# preoutgoing hook can prevent outgoing changes
echo 'preoutgoing.forbid = echo preoutgoing.forbid hook; exit 1' >> ../a/.hg/hgrc
hg pull ../a

cat > hooktests.py <<EOF
from mercurial import util

uncallable = 0

def printargs(args):
    args.pop('ui', None)
    args.pop('repo', None)
    a = list(args.items())
    a.sort()
    print 'hook args:'
    for k, v in a:
       print ' ', k, v
    return True

def passhook(**args):
    printargs(args)
    return True

def failhook(**args):
    printargs(args)

class LocalException(Exception):
    pass

def raisehook(**args):
    raise LocalException('exception from hook')

def aborthook(**args):
    raise util.Abort('raise abort from hook')

def brokenhook(**args):
    return 1 + {}

class container:
    unreachable = 1
EOF

echo '# test python hooks'
PYTHONPATH="$PWD:$PYTHONPATH"
export PYTHONPATH

echo '[hooks]' > ../a/.hg/hgrc
echo 'preoutgoing.broken = python:hooktests.brokenhook' >> ../a/.hg/hgrc
hg pull ../a 2>&1 | grep 'raised an exception'

echo '[hooks]' > ../a/.hg/hgrc
echo 'preoutgoing.raise = python:hooktests.raisehook' >> ../a/.hg/hgrc
hg pull ../a 2>&1 | grep 'raised an exception'

echo '[hooks]' > ../a/.hg/hgrc
echo 'preoutgoing.abort = python:hooktests.aborthook' >> ../a/.hg/hgrc
hg pull ../a

echo '[hooks]' > ../a/.hg/hgrc
echo 'preoutgoing.fail = python:hooktests.failhook' >> ../a/.hg/hgrc
hg pull ../a

echo '[hooks]' > ../a/.hg/hgrc
echo 'preoutgoing.uncallable = python:hooktests.uncallable' >> ../a/.hg/hgrc
hg pull ../a

echo '[hooks]' > ../a/.hg/hgrc
echo 'preoutgoing.nohook = python:hooktests.nohook' >> ../a/.hg/hgrc
hg pull ../a

echo '[hooks]' > ../a/.hg/hgrc
echo 'preoutgoing.nomodule = python:nomodule' >> ../a/.hg/hgrc
hg pull ../a

echo '[hooks]' > ../a/.hg/hgrc
echo 'preoutgoing.badmodule = python:nomodule.nowhere' >> ../a/.hg/hgrc
hg pull ../a

echo '[hooks]' > ../a/.hg/hgrc
echo 'preoutgoing.unreachable = python:hooktests.container.unreachable' >> ../a/.hg/hgrc
hg pull ../a

echo '[hooks]' > ../a/.hg/hgrc
echo 'preoutgoing.pass = python:hooktests.passhook' >> ../a/.hg/hgrc
hg pull ../a

echo '# make sure --traceback works'
echo '[hooks]' > .hg/hgrc
echo 'commit.abort = python:hooktests.aborthook' >> .hg/hgrc

echo a >> a
hg --traceback commit -A -m a 2>&1 | grep '^Traceback'

exit 0