view tests/test-transaction-rollback-on-sigpipe.t @ 46393:66e8e279133b

hghave: list the module needed for the `vcr` check

I'm tired of having to look up modules each time I setup a system, and try to
distinguish between similar package names to get the right one.  Now that the
search API has been disabled, it's even harder.  There are other python packages
here that should be listed like this, but this is the one that came up missing
today, so it's a start.

Differential Revision: https://phab.mercurial-scm.org/D9879

Test that, when an hg push is interrupted and the remote side recieves SIGPIPE,
the remote hg is able to successfully roll back the transaction.

  $ hg init -q remote
  $ hg clone -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" -q ssh://user@dummy/`pwd`/remote local

  $ check_for_abandoned_transaction() {
  >     [ -f $TESTTMP/remote/.hg/store/journal ] && echo "Abandoned transaction!"
  > }

  $ pidfile=`pwd`/pidfile
  $ >$pidfile

  $ script() {
  >     cat >"$1"
  >     chmod +x "$1"
  > }

On the remote end, run hg, piping stdout and stderr through processes that we
know the PIDs of. We will later kill these to simulate an ssh client
disconnecting.

  $ killable_pipe=`pwd`/killable_pipe.sh
  $ script $killable_pipe <<EOF
  > #!/bin/bash
  > echo \$\$ >> $pidfile
  > exec cat
  > EOF

  $ remotecmd=`pwd`/remotecmd.sh
  $ script $remotecmd <<EOF
  > #!/bin/bash
  > hg "\$@" 1> >($killable_pipe) 2> >($killable_pipe >&2)
  > EOF

In the pretxnchangegroup hook, kill the PIDs recorded above to simulate ssh
disconnecting. Then exit nonzero, to force a transaction rollback.

  $ hook_script=`pwd`/pretxnchangegroup.sh
  $ script $hook_script <<EOF
  > #!/bin/bash
  > for pid in \$(cat $pidfile) ; do
  >   kill \$pid
  >   while kill -0 \$pid 2>/dev/null ; do
  >     sleep 0.1
  >   done
  > done
  > exit 1
  > EOF

  $ cat >remote/.hg/hgrc <<EOF
  > [hooks]
  > pretxnchangegroup.break-things=$hook_script
  > EOF

  $ cd local
  $ echo foo > foo ; hg commit -qAm "commit"
  $ hg push -q -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" --remotecmd $remotecmd 2>&1 | grep -v $killable_pipe
  abort: stream ended unexpectedly (got 0 bytes, expected 4)

  $ check_for_abandoned_transaction
  [1]