From 99e4b6e7677e34dd33eb3dbd7ba0c5a93ce60105 Mon Sep 17 00:00:00 2001
From: Stephane Gourichon <stephane.gourichon@fidergo.fr>
Date: Sun, 24 Mar 2024 17:13:58 +0100
Subject: [PATCH] Script to install monitoring task.

---
 tools/monitoring__crontask_install.sh | 52 +++++++++++++++++++++++++++
 tools/run_and_output_only_on_error.sh | 22 ++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100755 tools/monitoring__crontask_install.sh
 create mode 100755 tools/run_and_output_only_on_error.sh

diff --git a/tools/monitoring__crontask_install.sh b/tools/monitoring__crontask_install.sh
new file mode 100755
index 0000000..a7a13fa
--- /dev/null
+++ b/tools/monitoring__crontask_install.sh
@@ -0,0 +1,52 @@
+#!/bin/bash
+
+if [[ "$#" != 1 ]]
+then
+    echo >&2 "usage:"
+    echo >&2 "$0 install"
+    echo >&2 "$0 uninstall"
+    exit 1
+fi
+
+if [[ "$1" == "install" ]]
+then
+    INSTALL=true
+elif [[ "$1" == "uninstall" ]]
+then
+    INSTALL=false
+else
+    echo >&2 "unknown argument : $1"
+    exit 1
+fi
+
+cd -P "$(dirname "$(readlink -f "$0")" )"
+
+if [[ "$PWD" != "$(printf %q "$PWD" )" ]]
+then
+    echo >&2 "WARNING: path seems unsafe: $PWD"
+fi
+
+SCRIPT_ROOT="$PWD"
+cd ..
+INFRA_ROOT="$PWD"
+
+CRON_LINES=()
+
+if [[ "$INSTALL" == true ]]
+then
+    while IFS="" read -u 3 -r MONITOR_SCRIPT_PATH
+    do
+	if [[ "$MONITOR_SCRIPT_PATH" != "$(printf %q "$MONITOR_SCRIPT_PATH" )" ]]
+	then
+	    echo >&2 "WARNING: path seems unsafe: $MONITOR_SCRIPT_PATH"
+	fi
+
+	CRON_LINES+=( "0 0 * * * $SCRIPT_ROOT/run_and_output_only_on_error.sh $INFRA_ROOT/$MONITOR_SCRIPT_PATH # monitoring_crontask" )
+
+    done 3< <( find */ -iname "monitor_check_once.sh" )
+fi
+
+{
+    crontab -l | fgrep -v "# monitoring_crontask"
+    printf '%s\n' "${CRON_LINES[@]}"
+} | crontab -
diff --git a/tools/run_and_output_only_on_error.sh b/tools/run_and_output_only_on_error.sh
new file mode 100755
index 0000000..8b75bf6
--- /dev/null
+++ b/tools/run_and_output_only_on_error.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -eu
+
+LOGFILENAME=$(mktemp /tmp/run_and_output_only_on_error_XXXXXX)
+# set -xv
+
+trap "rm -f ${LOGFILENAME}" EXIT
+
+if
+    (
+        $@
+    ) > "${LOGFILENAME}" 2>&1
+then
+    true
+else
+    echo
+    echo "Error on running: $@"
+    echo
+    echo "Here's the program's output (out and err combined)"
+    cat "${LOGFILENAME}"
+fi