Add locking to poudboot.

ansible/roles/poudriere/files/poudboot.bash

@@ -5,26 +5,56 @@ set -euo pipefail
 IFS=$'\n\t'
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
+: ${LOCKFILE:="/var/run/poudboot.lock"}
+
+############## Setup #########################
+
+# function cleanup {
+#     for f in "${folders[@]}"; do
+#         log "Deleting $f"
+#         rm -rf "$f"
+#     done
+# }
+# folders=()
+# for sig in EXIT INT QUIT HUP TERM; do
+#   trap "set +e; cleanup" "$sig"
+# done
+
+function die {
+    local status_code="$1"
+    shift
+    (>&2 echo "${@}")
+    exit "$status_code"
+}
+
+function log {
+    (>&2 echo "${@}")
+}
+
+function run_locked {
+    if [ "${RUN_LOCKED:-}" != "RUN" ]; then
+        exec env RUN_LOCKED=RUN flock --nonblock $LOCKFILE $0 $@
+    fi
+
+}
+
+############## Program #########################
+
 function main {
-    COMMAND="$1"
+    local COMMAND="$1"
-    shift 1
 
     if [ "$COMMAND" = "start" ]; then
+        run_locked "${@}"
+        shift 1
         cmd_start "${@}"
     elif [ "$COMMAND" = "stop" ]; then
+        shift 1
         cmd_stop "${@}"
     else
         die 1 "Unrecognized command: $COMMAND"
     fi
 }
 
-function die {
-    exit_code="$1"
-    shift 1
-    (>&2 echo "${@}")
-    exit "$exit_code"
-}
-
 function abort_if_jobs_running {
     if [[ $(sudo poudriere status) != *"No running builds"* ]]; then
         echo "There is already a poudriere build in progress, exiting."
@@ -40,21 +70,18 @@ function build {
 function cmd_start {
     abort_if_jobs_running
 
+    for conf in /opt/poudriere/build_configs/*; do
+        (
             # Allow command failures without quitting the script because some
             # package sets might fail whereas others may succeed based on which
             # packages are in each set.
             set +e
 
-    for conf in /opt/poudriere/build_configs/*; do
-        (
             source "$conf"
             build -j "$JAIL" -p "$PORTS" -z "$SET" -f /usr/local/etc/poudriere.d/$JAIL-$PORTS-$SET-pkglist
         )
     done
 
-    # Re-enable exiting on failed commands
-    set -e
-
     # Cleanup old unused dist files
     for conf in /opt/poudriere/build_configs/*; do
         (