From 1b08ec576fc105be8542a61aceb1b3683557e4b3 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Sun, 23 Apr 2017 12:02:07 +0200
Subject: bin/get-assignment: add max_parallel_build_per_client and some
 verbosity

---
 bin/get-assignment | 48 +++++++++++++++++++++++++++++++++++++++++++++++-
 conf/default.conf  |  2 ++
 2 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/bin/get-assignment b/bin/get-assignment
index f74399d..fed7056 100755
--- a/bin/get-assignment
+++ b/bin/get-assignment
@@ -3,6 +3,16 @@
 # receive one package to be built from the build-list whose dependencies
 # are already satisfied or which breaks a dependency cycle
 
+# exit code shows state of success:
+#  0: ok, I gave you an assignment
+#  1: come back (shortly) later - I was running already
+#  2: come back later - there are still packages to be built,
+#     but currently none has all its dependencies ready
+#  3: come back after the next run of get-package-updates - currently
+#     there are no pending packages
+#  4: come back, when you've done your work - you hit the limit on
+#     maximum allowed parallel jobs per ip
+
 # TODO:
 #  respect build-manually-list
 
@@ -27,7 +37,41 @@ hand_out_assignment() {
 # Create a lock file.
 
 exec 9> "${lock_file}"
-flock -n 9 || exit
+if ! flock -n 9; then
+  >&2 echo 'come back (shortly) later - I was running already'
+  exit 1
+fi
+
+# Check if there are any pending packages at all and if the requester
+# has already hit its max_parallel_build_per_client limit.
+
+num_jobs=0
+pending_packages=false
+
+while read -r package git_revision repository; do
+
+  if [ -f "${work_dir}/package-states/${package}.${git_revision}.${repository}.locked" ];
+  then
+    if [ "${SSH_CLIENT%% *}" = "$(cat "${work_dir}/package-states/${package}.${git_revision}.${repository}.locked")" ]; then
+      num_jobs=$[${num_jobs}+1];
+    fi
+  else
+    pending_packages=true
+  fi
+
+done < "${work_dir}/build-list"
+
+if ! ${pending_packages}; then
+  >&2 echo 'come back after the next run of get-package-updates - currently there are no pending packages'
+  rm -f "${lock_file}"
+  exit 3
+fi
+
+if [ ${num_jobs} -ge ${max_parallel_build_per_client} ]; then
+  >&2 echo "come back, when you've done your work - you hit the limit on maximum allowed parallel jobs per ip"
+  rm -f "${lock_file}"
+  exit 4
+fi
 
 while read -r package git_revision repository; do
 
@@ -62,4 +106,6 @@ fi
 
 # Remove the lock file
 
+>&2 echo 'come back later - there are still packages to be built, but currently none has all its dependencies ready'
 rm -f "${lock_file}"
+exit 2
diff --git a/conf/default.conf b/conf/default.conf
index 1517272..0343ba4 100755
--- a/conf/default.conf
+++ b/conf/default.conf
@@ -15,6 +15,8 @@ repo_paths["archlinux32"]="${work_dir}/repos/packages32"
 
 lock_file="/tmp/${0##*/}.lock"
 
+max_parallel_build_per_client=2
+
 # possibly pull in custom modifications
 
 [ -r "${base_dir}/conf/local.conf" ] && . "${base_dir}/conf/local.conf"
-- 
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