[scripts] move file lock handling for iso_build.sh consumers from crontab

scripts/daily_iso_build_locked.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+SABAYON_MOLECULE_HOME="${SABAYON_MOLECULE_HOME:-/sabayon}"
+
+exec "${SABAYON_MOLECULE_HOME}/scripts/iso_build_locked.sh" "daily_iso_build.sh"

scripts/iso_build.include

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+ISO_BUILD_LOCK=/tmp/.daily_iso_build.sh.lock

scripts/iso_build_locked.sh

@@ -0,0 +1,35 @@
+#!/bin/sh
+
+if [ -z "${1}" ]; then
+    echo "${0} <build script name>" >&2
+    exit 1
+fi
+
+BUILD_SCRIPT_NAME="${1}"
+
+SABAYON_MOLECULE_HOME="${SABAYON_MOLECULE_HOME:-/sabayon}"
+. "${SABAYON_MOLECULE_HOME}/scripts/iso_build.include"
+
+# Pull new data from Git
+(
+    flock --timeout 7200 -x 9
+    if [ "${?}" != "0" ]; then
+        echo "[git pull] cannot acquire lock, stale process holding it?" >&2
+        exit 1
+    fi
+    cd /sabayon && git pull --quiet
+) 9> "${ISO_BUILD_LOCK}"
+
+# Execute build
+(
+    flock --timeout 7200 -x 9
+    if [ "${?}" != "0" ]; then
+        echo "[build] cannot acquire lock, stale process holding it?" >&2
+        exit 1
+    fi
+
+    "${SABAYON_MOLECULE_HOME}/scripts/${BUILD_SCRIPT_NAME}"
+
+) 9> "${ISO_BUILD_LOCK}"
+
+exit ${?}

scripts/weekly_iso_build_locked.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+SABAYON_MOLECULE_HOME="${SABAYON_MOLECULE_HOME:-/sabayon}"
+
+exec "${SABAYON_MOLECULE_HOME}/scripts/iso_build_locked.sh" \
+    "weekly_iso_build.sh"