Per patch: multiple BMRR calls

This is to reduce sensitivity on testbed unstable performance.
Also add topo_cleanupbefore every pybot run
to avoid issues with VPP uninstall.

TRACE prints are left there to simplify investigation
of false positives if/when they happen.

Change-Id: I9b0cdcfbbe4aa0735a0596746ac32c9e93af0897
Signed-off-by: Vratko Polak <vrpolak@cisco.com>

3 files changed, 111 insertions, 82 deletions

diff --git a/resources/libraries/bash/entry/per_patch_perf.sh b/resources/libraries/bash/entry/per_patch_perf.sh
index 9fb266d106..abb1001652 100644
--- a/resources/libraries/bash/entry/per_patch_perf.sh
+++ b/resources/libraries/bash/entry/per_patch_perf.sh
@@ -24,7 +24,7 @@ set -exuo pipefail
 # + Everything needed to build VPP is already installed locally.
 # Consequences:
 # + At the end, VPP repo has parent commit checked out and built.
-# + Directories build_root, dpdk and csit are reset during the run.
+# + Directories build_root, build and csit are reset during the run.
 # + The following directories (relative to VPP repo) are (re)created:
 # ++ csit_new, csit_parent, build_new, build_parent,
 # ++ archive, csit/archive, csit_download_dir.
@@ -44,9 +44,10 @@ set_perpatch_vpp_dir || die
 build_vpp_ubuntu_amd64 "NEW" || die
 prepare_build_parent || die
 build_vpp_ubuntu_amd64 "PARENT" || die
-prepare_test_new || die
+prepare_test || die
 ## Replace previous 4 lines with this to speed up testing.
-#download_builds "REPLACE_WITH_URL" || die
+#download_builds "https://jenkins.fd.io/sandbox/job/vpp-csit-verify-perf-master-2n-skx/2/artifact/*zip*/archive.zip" || die
+initialize_csit_dirs || die
 get_test_tag_string || die
 get_test_code "${1-}" || die
 set_perpatch_dut || die
@@ -55,15 +56,24 @@ activate_virtualenv "${VPP_DIR}" || die
 reserve_testbed || die
 select_tags || die
 compose_pybot_arguments || die
-check_download_dir || die
-run_pybot "10" || die
-copy_archives || die
-die_on_pybot_error || die
-prepare_test_parent || die
-check_download_dir || die
-run_pybot "10" || die
+iterations=8
+for ((iter=0; iter<iterations; iter++)); do
+    # TODO: Use less heavy way to avoid apt remove falilures.
+    cleanup_topo
+    select_build "build_parent" || die
+    check_download_dir || die
+    run_pybot || die
+    copy_archives || die
+    archive_parse_test_results "csit_parent/${iter}" || die
+    die_on_pybot_error || die
+    cleanup_topo
+    select_build "build_new" || die
+    check_download_dir || die
+    run_pybot || die
+    copy_archives || die
+    archive_parse_test_results "csit_new/${iter}" || die
+    die_on_pybot_error || die
+done
 untrap_and_unreserve_testbed || die
-copy_archives || die
-die_on_pybot_error || die
 compare_test_results  # The error code becomes this script's error code.
 # TODO: After merging, make sure archiving works as expected.
diff --git a/resources/libraries/bash/function/common.sh b/resources/libraries/bash/function/common.sh
index 8b83ab4e7e..69c70935c7 100644
--- a/resources/libraries/bash/function/common.sh
+++ b/resources/libraries/bash/function/common.sh
@@ -82,6 +82,20 @@ function check_download_dir () {
 }
 
 
+function cleanup_topo () {
+
+    set -exuo pipefail
+
+    # Variables read:
+    # - WORKING_TOPOLOGY - Path to topology yaml file of the reserved testbed.
+    # - PYTHON_SCRIPTS_DIR - Path to directory holding the reservation script.
+
+    python "${PYTHON_SCRIPTS_DIR}/topo_cleanup.py" -t "${WORKING_TOPOLOGY}"
+    # Not using "|| die" as some callers might want to ignore errors,
+    # e.g. in teardowns, such as unreserve.
+}
+
+
 function common_dirs () {
 
     set -exuo pipefail
@@ -178,7 +192,7 @@ function copy_archives () {
     # automatically archived to logs.fd.io.
     if [[ -n "${WORKSPACE-}" ]]; then
         mkdir -p "${WORKSPACE}/archives/" || die "Archives dir create failed."
-        cp -r "${ARCHIVE_DIR}"/* "${WORKSPACE}/archives" || die "Copy failed."
+        cp -rf "${ARCHIVE_DIR}"/* "${WORKSPACE}/archives" || die "Copy failed."
     fi
 }
 
@@ -310,7 +324,7 @@ function reserve_testbed () {
                     }
                     die "Trap attempt failed, unreserve succeeded. Aborting."
                 }
-                python "${PYTHON_SCRIPTS_DIR}/topo_cleanup.py" -t "${topo}" || {
+                cleanup_topo || {
                     die "Testbed cleanup failed."
                 }
                 break
@@ -630,9 +644,9 @@ function untrap_and_unreserve_testbed () {
     wt="${WORKING_TOPOLOGY}"  # Just to avoid too long lines.
     if [[ -z "${wt-}" ]]; then
         set -eu
-        echo "Testbed looks unreserved already. Trap removal failed before?"
+        warn "Testbed looks unreserved already. Trap removal failed before?"
     else
-        python "${PYTHON_SCRIPTS_DIR}/topo_cleanup.py" -t "${wt}" || true
+        cleanup_topo || true
         python "${PYTHON_SCRIPTS_DIR}/topo_reservation.py" -c -t "${wt}" || {
             die "${1:-FAILED TO UNRESERVE, FIX MANUALLY.}" 2
         }
diff --git a/resources/libraries/bash/function/per_patch.sh b/resources/libraries/bash/function/per_patch.sh
index 4353a5e1a5..244b6f448c 100644
--- a/resources/libraries/bash/function/per_patch.sh
+++ b/resources/libraries/bash/function/per_patch.sh
@@ -21,6 +21,35 @@ set -exuo pipefail
 # TODO: Add a link to bash style guide.
 
 
+function archive_parse_test_results () {
+
+    set -exuo pipefail
+
+    # Arguments:
+    # - ${1}: Directory to archive to. Required. Parent has to exist.
+    # Variables read:
+    # - ARCHIVE_DIR - Path to where robot result files are created in.
+    # - VPP_DIR - Path to existing directory, root for to relative paths.
+    # Directories updated:
+    # - ${1} - Created, and robot and parsing files are moved/created there.
+    # Functions called:
+    # - die - Print to stderr and exit, defined in common.sh
+    # - parse_bmrr_results - See definition in this file.
+
+    cd "${VPP_DIR}" || die "Change directory command failed."
+    target="$(readlink -f "$1")"
+    mkdir -p "${target}" || die "Directory creation failed."
+    for filename in "output.xml" "log.html" "report.html"; do
+        mv "${ARCHIVE_DIR}/${filename}" "${target}/${filename}" || {
+            die "Attempt to move '${filename}' failed."
+        }
+    done
+    parse_bmrr_results "${target}" || {
+        die "The function should have died on error."
+    }
+}
+
+
 function build_vpp_ubuntu_amd64 () {
 
     set -exuo pipefail
@@ -50,7 +79,7 @@ function build_vpp_ubuntu_amd64 () {
     # On the other hand, if parent uses different dpdk version,
     # The new vpp-ext-deps is built, but the old one is not removed
     # from the build directory if present. (Further functions move both,
-    # and during test dpkg decides on its own which version gets installed.)
+    # and during test dpkg would decide randomly which version gets installed.)
     # As per_patch is too dumb (yet) to detect any of that,
     # the only safe solution is to clean build directory and force rebuild.
     # TODO: Make this function smarter and skip DPDK rebuilds if possible.
@@ -70,7 +99,6 @@ function build_vpp_ubuntu_amd64 () {
     mv -v "build/external/vpp-ext-deps"*".deb" "build-root"/ || {
         die "*.deb move failed."
     }
-
     echo "*******************************************************************"
     echo "* VPP ${1-} BUILD SUCCESSFULLY COMPLETED" || {
         die "Argument not found."
@@ -98,17 +126,6 @@ function compare_test_results () {
     # - 1 - If the comparison utility sees a regression (or data error).
 
     cd "${VPP_DIR}" || die "Change directory operation failed."
-    rm -rf "csit_parent" || die "Remove operation failed."
-    mkdir -p "csit_parent" || die "Directory creation failed."
-    for filename in "output.xml" "log.html" "report.html"; do
-        mv "${ARCHIVE_DIR}/${filename}" "csit_parent/${filename}" || {
-            die "Attempt to move '${filename}' failed."
-        }
-    done
-    parse_bmrr_results "csit_parent" || {
-        die "The function should have died on error."
-    }
-
     # Reusing CSIT main virtualenv.
     pip install -r "${PYTHON_SCRIPTS_DIR}/perpatch_requirements.txt" || {
         die "Perpatch Python requirements installation failed."
@@ -128,12 +145,10 @@ function download_builds () {
     # - ${1} - URL to download VPP builds from.
     # Variables read:
     # - VPP_DIR - Path to WORKSPACE, parent of created directories.
-    # - DOWNLOAD_DIR - Path to directory pybot takes the build to test from.
     # Directories created:
     # - archive - Ends up empty, not to be confused with ${ARCHIVE_DIR}.
     # - build_new - Holding built artifacts of the patch under test (PUT).
     # - built_parent - Holding built artifacts of parent of PUT.
-    # - csit_new - (Re)set to a symlink to archive robot results on failure.
     # Functions called:
     # - die - Print to stderr and exit, defined in common.sh
 
@@ -145,11 +160,30 @@ function download_builds () {
     unzip "archive.zip" || die "Archive extraction failed."
     mv "archive/build_parent" ./ || die "Move operation failed."
     mv "archive/build_new" ./ || die "Move operation failed."
-    cp -r "build_new"/*".deb" "${DOWNLOAD_DIR}" || {
-        die "Copy operation failed."
+}
+
+
+function initialize_csit_dirs () {
+
+    set -exuo pipefail
+
+    # This could be in prepare_test, but download_builds also needs this.
+    #
+    # Variables read:
+    # - VPP_DIR - Path to WORKSPACE, parent of created directories.
+    # Directories created:
+    # - csit_new - Holding test results of the patch under test (PUT).
+    # - csit_parent - Holding test results of parent of PUT.
+    # Functions called:
+    # - die - Print to stderr and exit, defined in common.sh
+
+    cd "${VPP_DIR}" || die "Change directory operation failed."
+    rm -rf "csit_new" "csit_parent" || {
+        die "Directory deletion failed."
+    }
+    mkdir -p "csit_new" "csit_parent" || {
+        die "Directory creation failed."
     }
-    # Create symlinks so that if job fails on robot, results can be archived.
-    ln -s "${ARCHIVE_DIR}" "csit_new" || die "Symbolic link creation failed."
 }
 
 
@@ -172,11 +206,9 @@ function parse_bmrr_results () {
     rel_dir="$(readlink -e "${1}")" || die "Readlink failed."
     in_file="${rel_dir}/output.xml"
     out_file="${rel_dir}/results.txt"
-
     # TODO: Do we need to check echo exit code explicitly?
     echo "Parsing ${in_file} putting results into ${out_file}"
     echo "TODO: Re-use parts of PAL when they support subsample test parsing."
-
     pattern='Maximum Receive Rate trial results in packets'
     pattern+=' per second: .*\]</status>'
     grep -o "${pattern}" "${in_file}" | grep -o '\[.*\]' > "${out_file}" || {
@@ -204,10 +236,9 @@ function prepare_build_parent () {
     mkdir -p "build_new" || die "Directory creation failed."
     mv "build-root"/*".deb" "build_new"/ || die "Move operation failed."
     # The previous build could have left some incompatible leftovers,
-    # e.g. DPDK artifacts of different version.
-    # "make -C dpdk clean" does not actually remove such .deb file.
+    # e.g. DPDK artifacts of different version (in build/external).
     # Also, there usually is a copy of dpdk artifact in build-root.
-    git clean -dffx "dpdk"/ "build-root"/ || die "Git clean operation failed."
+    git clean -dffx "build"/ "build-root"/ || die "Git clean operation failed."
     # Finally, check out the parent commit.
     git checkout HEAD~ || die "Git checkout operation failed."
     # Display any other leftovers.
@@ -215,74 +246,48 @@ function prepare_build_parent () {
 }
 
 
-function prepare_test_new () {
+function prepare_test () {
 
     set -exuo pipefail
 
     # Variables read:
     # - VPP_DIR - Path to existing directory, parent of accessed directories.
-    # - DOWNLOAD_DIR - Path to directory where Robot takes builds to test from.
-    # - ARCHIVE_DIR - Path to where robot result files are created in.
     # Directories read:
     # - build-root - Existing directory with built VPP artifacts (also DPDK).
     # Directories updated:
-    # - build_parent - Old directory removed, build-root moved to become this.
-    # - ${DOWNLOAD_DIR} - Old content removed, files from build_new copied here.
-    # - csit_new - Currently a symlink to to archive robot results on failure.
+    # - build_parent - Old directory removed, build-root debs moved here.
     # Functions called:
     # - die - Print to stderr and exit, defined in common.sh
 
-    cd "${VPP_DIR}" || die "Change directory operationf failed."
-    rm -rf "build_parent" "csit_new" "${DOWNLOAD_DIR}"/* || die "Remove failed."
+    cd "${VPP_DIR}" || die "Change directory operation failed."
+    rm -rf "build_parent" || die "Remove failed."
     mkdir -p "build_parent" || die "Directory creation operation failed."
     mv "build-root"/*".deb" "build_parent"/ || die "Move operation failed."
-    cp "build_new"/*".deb" "${DOWNLOAD_DIR}" || die "Copy operation failed."
-    # Create symlinks so that if job fails on robot, results can be archived.
-    ln -s "${ARCHIVE_DIR}" "csit_new" || die "Symbolic link creation failed."
 }
 
 
-function prepare_test_parent () {
+function select_build () {
 
     set -exuo pipefail
 
+    # Arguments:
+    # - ${1} - Path to directory to copy VPP artifacts from. Required.
     # Variables read:
-    # - VPP_DIR - Path to existing directory, parent of accessed directories.
-    # - CSIT_DIR - Path to existing root of local CSIT git repository.
-    # - ARCHIVE_DIR and DOWNLOAD_DIR - Paths to directories to update.
+    # - DOWNLOAD_DIR - Path to directory where Robot takes builds to test from.
+    # - VPP_DIR - Path to existing directory, root for relative paths.
     # Directories read:
-    # - build_parent - Build artifacts (to test next) are copied from here.
+    # - ${1} - Existing directory with built new VPP artifacts (and DPDK).
     # Directories updated:
-    # - csit_new - Deleted, then recreated and latest robot results copied here.
-    # - ${CSIT_DIR} - Subjected to git reset and git clean.
-    # - ${ARCHIVE_DIR} - Created if not existing (if deleted by git clean).
-    # - ${DOWNLOAD_DIR} - Created after git clean, parent build copied here.
-    # - csit_parent - Currently a symlink to csit/ to archive robot results.
+    # - ${DOWNLOAD_DIR} - Old content removed, .deb files from ${1} copied here.
     # Functions called:
     # - die - Print to stderr and exit, defined in common.sh
-    # - parse_bmrr_results - See definition in this file.
 
     cd "${VPP_DIR}" || die "Change directory operation failed."
-    rm -rf "csit_new" "csit_parent" || die "Remove operation failed."
-    mkdir -p "csit_new" || die "Create directory operation failed."
-    for filename in "output.xml" "log.html" "report.html"; do
-        mv "${ARCHIVE_DIR}/${filename}" "csit_new/${filename}" || {
-            die "Move operation of '${filename}' failed."
-        }
-    done
-    parse_bmrr_results "csit_new" || {
-        die "The function should have died on error."
-    }
-
-    pushd "${CSIT_DIR}" || die "Change directory operation failed."
-    git reset --hard HEAD || die "Git reset operation failed."
-    git clean -dffx || die "Git clean operation failed."
-    popd || die "Change directory operation failed."
-    mkdir -p "${ARCHIVE_DIR}" "${DOWNLOAD_DIR}" || die "Dir creation failed."
-
-    cp "build_parent"/*".deb" "${DOWNLOAD_DIR}"/ || die "Copy failed."
-    # Create symlinks so that if job fails on robot, results can be archived.
-    ln -s "${ARCHIVE_DIR}" "csit_parent" || die "Symlink creation failed."
+    source_dir="$(readlink -e "$1")"
+    rm -rf "${DOWNLOAD_DIR}"/* || die "Cleanup of download dir failed."
+    cp "${source_dir}"/*".deb" "${DOWNLOAD_DIR}" || die "Copy operation failed."
+    # TODO: Is there a nice way to create symlinks,
+    #   so that if job fails on robot, results can be archived?
 }