From 47eb9a4ee2a93630dd9d8712b4ea7b3386029cf6 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Wed, 21 Mar 2018 12:25:20 +0100
Subject: bin/ping-from-slave new to send pings to buildmaster in regular
 intervals during a build

---
 bin/build-packages | 16 ++++++++++++++++
 bin/ping-to-master | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100755 bin/ping-to-master

diff --git a/bin/build-packages b/bin/build-packages
index c7b5f85..aa3de6d 100755
--- a/bin/build-packages
+++ b/bin/build-packages
@@ -258,6 +258,7 @@ while [ "${count}" -ne 0 ]; do
         fi
         cd "${base_dir}"
         recursively_umount_and_rm "${tmp_dir}"
+        flock -u 9 || true
         exit "${err}"
       }
       find "${work_dir}" \
@@ -371,6 +372,17 @@ while [ "${count}" -ne 0 ]; do
         find . -maxdepth 1 -type f \( -name '*.pkg.tar.xz' -o -name '*.pkg.tar.xz.sig' \) -exec \
           rm {} \;
 
+        echo 'building' > "${tmp_dir}/.ping-build-master"
+        if [ -z "${forced_package}" ]; then
+          # we get a lock on "${work_dir}/ping-build-master.lock",
+          # if we release that lock, ping-to-master should stop _immediately_
+          exec 9> "${work_dir}/ping-build-master.lock"
+          if ! flock -n 9; then
+            >&2 echo 'ERROR: Cannot lock ping-to-master - this should not happen.'
+            exit 2
+          fi
+          "${base_dir}/bin/ping-to-master" "$$" "${tmp_dir}" &
+        fi
         >&2 printf '%s: building package "%s" (revisions %s %s, repository %s, straw %s) ...' \
           "$(date +'%Y-%m-%d %T')" \
           "${package}" \
@@ -390,6 +402,7 @@ while [ "${count}" -ne 0 ]; do
           >&2 printf ' ok.\n'
           tar_content_dir=$(mktemp -d "${tmp_dir}/tar-content.XXXXXX")
           find . -maxdepth 1 -type f -name '*-debug-*.pkg.tar.xz*' -delete
+          echo 'post-build' > "${tmp_dir}/.ping-build-master"
           >&2 printf 'signing package(s)\n'
           find . -maxdepth 1 -type f -name '*.pkg.tar.xz' \
             -execdir gpg --local-user="${package_key}" --detach-sign '{}' \; \
@@ -501,6 +514,7 @@ while [ "${count}" -ne 0 ]; do
               fi
             done
           >&2 printf ' ok.\n'
+          echo 'uploading' > "${tmp_dir}/.ping-build-master"
           if ${upload_to_build_master}; then
             find "${tar_content_dir}/" -maxdepth 1 \
               \( \
@@ -565,6 +579,7 @@ while [ "${count}" -ne 0 ]; do
           success=true
           break
         fi
+        echo 'failure' > "${tmp_dir}/.ping-build-master"
         >&2 printf ' failed.\n'
       done
 
@@ -619,6 +634,7 @@ while [ "${count}" -ne 0 ]; do
       # clean up tmp_dir
       cd "${base_dir}"
       recursively_umount_and_rm "${tmp_dir}"
+      flock -u 9 || true
       trap - EXIT
 
       continue
diff --git a/bin/ping-to-master b/bin/ping-to-master
new file mode 100755
index 0000000..15c9120
--- /dev/null
+++ b/bin/ping-to-master
@@ -0,0 +1,39 @@
+#!/bin/sh
+
+# periodically connects to the buildmaster to call ping-from slave to:
+#  - report any update on the build process
+#  - show that the build is still running
+#  - get notified by the build master if the build is not necessary anymore
+
+# shellcheck source=conf/default.conf
+. "${0%/*}/../conf/default.conf"
+
+# TODO: abort build if requested to
+
+parent_pid="$1"
+parent_tmp_dir="$2"
+
+exec 9> "${work_dir}/ping-build-master.lock"
+
+while kill -0 "${parent_pid}" && \
+  [ -f "${parent_tmp_dir}/.ping-build-master" ]; do
+
+  # shellcheck disable=SC2029
+  find "${parent_tmp_dir}" \
+    -xdev \
+    -type f \
+    -name '*.build-log' \
+    -exec wc -l {} \; | \
+    sed 's, .*/, ,' | \
+    ssh \
+      -i "${master_build_server_identity}" \
+      -p "${master_build_server_port}" \
+      "${master_build_server_user}@${master_build_server}" \
+      'ping-from-slave' "$(cat "${parent_tmp_dir}/.ping-build-master")"
+
+  # we wait upto 60 seconds to get the lock - if we get it, the parent
+  # must have released it and we're finished
+  if flock -w 60 9; then
+    break
+  fi
+done
-- 
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