tests/testlib/exchange-obsmarker-util.sh

test: add test-transaction-rollback-on-sigpipe.t demonstrating py3 regression

When an hg push is interrupted with C-c, the remote [hg serve] command
receives SIGPIPE.

If a pretxnchangegroup hook fails, the remote hg then tries to
rollback the transaction. It begins by printing "transaction
abort!\n". This returns EPIPE, but ui.py ignores that error.

In python3 (but not python2), this "transaction abort!\n" message
stays in a buffer, so future flushes of stderr will try to print the
message again, and so those flushes will also hit EPIPE.

This test demonstrates such a case where this EPIPE causes the
transaction rollback to fail, leaving behind an abandoned transaction.

Differential Revision: https://phab.mercurial-scm.org/D9151

#!/bin/sh
# setup config and various utility to test obsolescence marker exchanges tests

cat >> $TESTTMP/prune.sh << EOF
rev=\`hg log --hidden --template '{node}\n' --rev "\$3"\`

hg debugobsolete --record-parents \$1 "\$2" \$rev \
   && hg up --quiet 'max((::.) - obsolete())'
EOF

cat >> $HGRCPATH <<EOF
[web]
# We test http pull and push, drop authentication requirement
push_ssl = false
allow_push = *

[ui]
# simpler log output
logtemplate ="{node|short} ({phase}): {desc}\n"

[phases]
# non publishing server
publish=False

[experimental]
# reduce output changes
bundle2-output-capture=True
# enable evolution
evolution=true

[extensions]
# we need to strip some changeset for some test cases
hgext.strip=

[devel]
strip-obsmarkers = no

[alias]
# fix date used to create obsolete markers.
debugobsolete=debugobsolete -d '0 0'
# poor man substiture to the evolve 'hg prune'. using prune makes the test clearer and 
prune = !sh $TESTTMP/prune.sh \$1 "\$2" "\$3"
EOF

mkcommit() {
   echo "$1" > "$1"
   hg add "$1"
   hg ci -m "$1"
}
getid() {
   hg log --hidden --template '{node}\n' --rev "$1"
}

setuprepos() {
    echo creating test repo for test case $1
    mkdir $1
    cd $1
    echo - pulldest
    hg init pushdest
    cd pushdest
    mkcommit O
    hg phase --public .
    cd ..
    echo - main
    hg clone -q pushdest main
    echo - pushdest
    hg clone -q main pulldest
    echo 'cd into `main` and proceed with env setup'
}

inspect_obsmarkers (){
    # This exist as its own function to help the evolve extension reuse the tests as is.
    # The evolve extensions version will includes more advances query (eg:
    # related to obsmarkers discovery) to this.
    echo 'obsstore content'
    echo '================'
    hg debugobsolete
}

dotest() {
    # dotest TESTNAME [TARGETNODE] [PUSHFLAGS+]
    #
    # test exchange for the given test case.
    #
    # This function performs push and pull in all directions through all
    # protocols and display the resulting obsolescence markers on all sides.

    testcase=$1
    shift
    target="$1"
    if [ $# -gt 0 ]; then
        shift
    fi
    targetnode=""
    desccall=""
    cd $testcase
    echo "## Running testcase $testcase"
    if [ -n "$target" ]; then
        desccall="desc("\'"$target"\'")"
        targetnode="`hg -R main id -qr \"$desccall\"`"
        echo "# testing echange of \"$target\" ($targetnode)"
    fi
    echo "## initial state"
    echo "# obstore: main"
    hg -R main     debugobsolete | sort
    echo "# obstore: pushdest"
    hg -R pushdest debugobsolete | sort
    echo "# obstore: pulldest"
    hg -R pulldest debugobsolete | sort

    if [ -n "$target" ]; then
        echo "## pushing \"$target\"" from main to pushdest
        hg -R main push -r "$desccall" $@ pushdest
    else
        echo "## pushing from main to pushdest"
        hg -R main push pushdest $@
    fi
    echo "## post push state"
    echo "# obstore: main"
    hg -R main     debugobsolete | sort
    echo "# obstore: pushdest"
    hg -R pushdest debugobsolete | sort
    echo "# obstore: pulldest"
    hg -R pulldest debugobsolete | sort
    if [ -n "$target" ]; then
        echo "## pulling \"$targetnode\"" from main into pulldest
        hg -R pulldest pull -r $targetnode $@ main
    else
        echo "## pulling from main into pulldest"
        hg -R pulldest pull main $@
    fi
    echo "## post pull state"
    echo "# obstore: main"
    hg -R main     debugobsolete | sort
    echo "# obstore: pushdest"
    hg -R pushdest debugobsolete | sort
    echo "# obstore: pulldest"
    hg -R pulldest debugobsolete | sort

    cd ..

}