--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-transaction-rollback-on-sigpipe.t	Mon Oct 05 13:23:16 2020 -0400
@@ -0,0 +1,67 @@
+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 -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" --remotecmd $remotecmd 2>&1 | grep -v $killable_pipe
+  pushing to ssh://user@dummy/$TESTTMP/remote
+  searching for changes
+  remote: adding changesets
+  remote: adding manifests
+  remote: adding file changes
+  abort: stream ended unexpectedly (got 0 bytes, expected 4)
+
+  $ check_for_abandoned_transaction
+  Abandoned transaction!