setup_spawnhost_coredump

#!/bin/bash

cd $HOME # workaround EVG-12829

unameOut=$(uname -s)
case "${unameOut}" in
    Linux*)     machine=Linux;;
    Darwin*)    machine=Mac;;
    CYGWIN*)    machine=Cygwin;;
    *)          machine="UNKNOWN:${unameOut}"
esac

if [[ "${machine}" = "Cygwin" ]]; then
    out_dir="/cygdrive/c/setup_script_output.txt"
    desktop_dir="/cygdrive/c/Users/Administrator/Desktop"

    {
        date
        env

        echo "----------------------"
        echo -e "\n=> Setting _NT_SOURCE_PATH environment variable for debuggers to pick up source files."
        src_dir_hash=$(readlink -f /cygdrive/z/data/mci/source-*)
        full_src_dir="${src_dir_hash}/src"
        echo "Source Path: [${full_src_dir}]"
        set -x;
        setx _NT_SOURCE_PATH "${full_src_dir}"
        { set +x; } 2>/dev/null

        echo -e "\n=> Setting _NT_SYMBOL_PATH environment variable for debuggers to pick up the symbols."
        sym_parent_dir=$(readlink -f /cygdrive/z/data/mci/artifacts-*dist_test_debug)
        sym_dir=$(readlink -f ${sym_parent_dir}/debugsymbols-mongodb*zip)
        sym_extracted_dir="${sym_parent_dir}/extracted_symbols"
        full_sym_dir="${sym_extracted_dir}/dist-test/bin"
        echo "Symbols Dir: [${full_sym_dir}]"

        echo -e "\n=> Extracting Symbol files."
        set -x;
        mkdir ${sym_extracted_dir}
        unzip -n ${sym_dir} -d ${sym_extracted_dir}
        setx _NT_SYMBOL_PATH "${full_sym_dir};srv*;"
        { set +x; } 2>/dev/null

        echo -e "\n=> Extracting Core Dump to Desktop."
        full_dump_dir=$(readlink -f /cygdrive/z/data/mci/artifacts-* | grep -v dist_test)
        full_dump_parent_dir=$(readlink -f ${full_dump_dir}/mongo-coredumps*tgz)
        extracted_dump_dir="${full_dump_dir}/extracted_dump"
        set -x;
        mkdir ${extracted_dump_dir}
        tar -xzvf ${full_dump_parent_dir} -C ${extracted_dump_dir}
        cp ${extracted_dump_dir}/* ${desktop_dir}
        { set +x; } 2>/dev/null
        echo "Copied to Desktop."

    } &> ${out_dir}

    cp ${out_dir} ${desktop_dir}
else
    # Communicate to users that logged in before the script started that nothing is ready.
    wall "The setup_spawnhost_coredump script has just started setting up the debugging environment."

    # Write this file that gets cat'ed on login to communicate to users logging in if this setup script is still running.
    echo '+-----------------------------------------------------------------------------------+' > ~/.setup_spawnhost_coredump_progress
    echo "| The setup script is still setting up data files for inspection on a [${machine}] host. |" >> ~/.setup_spawnhost_coredump_progress
    echo '+-----------------------------------------------------------------------------------+' >> ~/.setup_spawnhost_coredump_progress

    cat >> ~/.profile <<EOF
cat ~/.setup_spawnhost_coredump_progress
# Coredumps generated by a toolchain built mongodb can be problematic when examined with the system
# gdb.
alias gdb='/opt/mongodbtoolchain/v3/bin/gdb'
# As per below, put the user into the appropriate directory. This is where gdb is expected to be
# invoked from.
cd debug
echo "Debuggable binaries:"
ls -l mongo* | grep -v debug$
for item in "mongo" "mongod" "mongos"; do
    echo "\${item} core dumps:"
    ls -l dump_\${item}.*
done

echo "Core dumps from unknown processes (crashed processes typically found here):"
ls -l dump_* | grep -v mongo

echo
echo "To examine a core dump, type 'gdb ./<binary> ./<core file>'"
cat ~/.setup_spawnhost_coredump_progress
EOF

    echo 'if [ -f ~/.profile ]; then
    . ~/.profile
fi' >> .bash_profile

    # Make a directory on the larger EBS volume. Soft-link it under the home directory. The smaller home
    # volume can have trouble particularly with coredumps from sharded timeouts.
    mkdir /data/debug
    ln -s /data/debug .
    cd debug

    # As the name suggests, pretty printers. Primarily for boost::optional<T>
    git clone git@github.com:ruediger/Boost-Pretty-Printer.git &

    # Discover and unarchive necessary files and source code. This will put mongo binaries and their
    # partner .debug files in the same `debug/bin` directory. The `bin` directory will later be symbolic
    # linked into the top-level (`debug`) directory. Shared library files and their debug symbols will
    # be dumped into a `debug/lib` directory for tidiness. The mongo `<reporoot>/src/` directory is soft
    # linked as `debug/src`. The .gdbinit file assumes gdb is being run from the `debug` directory.
    BIN_ARCHIVE=`ls /data/mci/artifacts-*archive_dist_test*/mongo-*.tgz`
    tar --wildcards --strip-components=1 -xzf $BIN_ARCHIVE '*/bin/mongod' '*/bin/mongos' '*/bin/mongo' '*/bin/mongobridge' &
    tar --wildcards --strip-components=1 -xzf $BIN_ARCHIVE '*/lib/*' &
    DBG_ARCHIVE=`ls /data/mci/artifacts-*archive_dist_test_debug/debugsymbols-*.tgz`
    tar --wildcards --strip-components=1 -xzf $DBG_ARCHIVE '*/bin/mongod.debug' '*/bin/mongos.debug' '*/bin/mongo.debug' '*/bin/mongobridge.debug' &
    tar --wildcards --strip-components=1 -xzf $DBG_ARCHIVE '*/lib/*' &
    UNITTEST_ARCHIVE=`ls /data/mci/artifacts-*run_unittests/mongo-unittests-*.tgz`
    tar --wildcards --strip-components=0 -xzf $UNITTEST_ARCHIVE 'bin/*' &
    tar --wildcards -xzf $UNITTEST_ARCHIVE 'lib/*' &

    SRC_DIR=`find /data/mci/ -maxdepth 1 | grep source`
    ln -s $SRC_DIR/.gdbinit .
    ln -s $SRC_DIR/src src
    ln -s $SRC_DIR/buildscripts buildscripts

    # Install pymongo to get the bson library for pretty-printers.
    /opt/mongodbtoolchain/v3/bin/pip3 install -r $SRC_DIR/etc/pip/dev-requirements.txt &

    COREDUMP_ARCHIVE=`ls /data/mci/artifacts-*/mongo-coredumps-*.tgz`
    tar -xzf $COREDUMP_ARCHIVE &
    echo "Waiting for background processes to complete."
    wait

    # Symbolic linking all of the executable files is sufficient for `gdb ./mongod ./dump_mongod.core`
    # to succeed. This inadvertantly also links in the ".debug" files which is unnecessary, but
    # harmless. gdb expects the .debug files to live adjacent to the physical binary.
    ln -s bin/* ./

    cat >> ~/.gdbinit <<EOF
set auto-load safe-path /
set solib-search-path ./lib/
set pagination off
set print object on
set print static-members off
set print pretty on

python
import sys
sys.path.insert(0, './Boost-Pretty-Printer')
import boost
boost.register_printers()
end
EOF

    echo "dir $HOME/debug" >> ~/.gdbinit

    # Empty out the progress script that warns users about the set script still running when users log in.
    echo "" > ~/.setup_spawnhost_coredump_progress
    # Alert currently logged in users that this setup script has completed. Logging back in will ensure any
    # paths/environment variables will be set as intended.
    wall "The setup_spawnhost_coredump script has completed, please relogin to ensure the right environment variables are set."
fi

# Send a Slack notification as the very last thing the setup_spawnhost_coredump script does.
# This way a Server engineer can temporarily forget about the Evergreen host they spawned until the
# paths and environment variables are configured as intended for when they first connect.
slack_user=$(cat ~/.evergreen.yml | awk '{if ($1 == "user:") print $2}')
ssh_user=$(whoami)
# Refer to the https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html
# documentation for more information on the AWS instance metadata endpoints.
aws_metadata_svc="http://169.254.169.254"
aws_token=$(curl -s -X PUT "$aws_metadata_svc/latest/api/token" -H 'X-aws-ec2-metadata-token-ttl-seconds: 60')
ssh_host=$(curl -s -H "X-aws-ec2-metadata-token: $aws_token" "$aws_metadata_svc/latest/meta-data/public-hostname")
if [[ "${machine}" = "Cygwin" ]]; then
    slack_message=$(printf "The setup_spawnhost_coredump script has finished setting things up. \
Please use Windows Remote Desktop with\n\
1. PC name: $ssh_host\n\
2. User account: $ssh_user\n\
3. The RDP password configured under the edit dialog at https://spruce.mongodb.com/spawn/host\n\
to log in.")
else
    slack_message="The setup_spawnhost_coredump script has finished setting things up. Please run "'```'"ssh $ssh_user@$ssh_host"'```'" to log in."
fi

# The Evergreen spawn host is expected to be provisioned with the user's .evergreen.yml credentials.
# But in case something unexpected happens we don't want the setup_spawnhost_coredump script itself
# to error.
if [[ -n "${slack_user}" ]]; then
    evergreen notify slack -t "@$slack_user" -m "$slack_message"
fi