Add checks for super user exists

ReadMe.md

@@ -21,11 +21,13 @@ Two files must be created
 
 Example file is `pgbackrest.sample.cfg`
 
-This file holds the sudo_user for calling the commands
+This file holds the sudo_user for calling the commands and the main pgbackrest config file.
+If the super user or config file does not exists an error will be shown
 
 ```ini
 [PgBackRest]
 sudo_user=postgres
+pgbackrest_config=/etc/pgbackrest.conf
 ```
 
 ### `config/stanza.cfg`
@@ -34,16 +36,30 @@ Example file is `stanza.sample.cfg`
 
 This files holds the stanzas to backup
 
-`stanza:repo number:path to config file`
+`stanza:repo number:path to config file:super user`
 
 If the stanza has several repo settings as in "repo1-...", "repo2-..." then the repo to target can be listed in here by ":repo number"
 
 The third optional parameter is a config file path
 
+The forth optional parameter is the super user to use
+
+If parameters are not used but laters are, the empties need to be set with just the ":"
+
+`stanza::/config`
+
+The script checks for the following things during each run
+
+- stanza name exists in the main config file, or in the override config file if set
+- check if repo number exist in main config file, or in the override config file if set
+- override config file exists
+- override super does not exist
+
 ```ini
 [stanzas]
 stanza_a
 stanza_b:1
 stanza_b:2
 stanza_c::/etc/to/config
+stanza_d:::super user
 ```

bin/pgbackrest_backup.sh

@@ -71,6 +71,10 @@ if [ -z "${sudo_user}" ]; then
 	echo "sudo_user not set in the config file ${config_file}";
 	exit;
 fi;
+if ! id "${sudo_user}" &>/dev/null; then
+	echo "Sudo user ${sudo_user} does not exist, skipping stanza";
+	exit
+fi;
 if [ -z "${pgbackrest_config}" ] ||[ ! -f "${pgbackrest_config}" ]; then
 	echo "Missing pgbackrest default config file ${pgbackrest_config}";
 	exit;
@@ -185,6 +189,8 @@ while read -r stanza; do
 	stanza_repo=$(echo "${stanza}" | awk -F':' '{print (NF>1) ? $2 : ""}');
 	# if we have a config
 	stanza_config=$(echo "${stanza}" | awk -F':' '{print (NF>1) ? $3 : ""}');
+	# for possible override super user
+	stanza_super_user=$(echo "${stanza}" | awk -F':' '{print (NF>3) ? $4 : ""}');
 	# override stanza check
 	if [ -n "${OVERRIDE_STANZA}" ]; then
 		# skip if not matching name
@@ -198,6 +204,7 @@ while read -r stanza; do
 		fi;
 		# set repo from override
 		stanza_repo="${OVERRIDE_STANZA_REPO}";
+		# config
 		OVERRIDE_STANZA_CONFIG=$(echo "${OVERRIDE_STANZA}" | awk -F':' '{print (NF>2) ? $3 : ""}');
 		# if we have a config set in the stanza config, but none in the override, use the one from the stanza config
 		if [ -z "${OVERRIDE_STANZA_CONFIG}" ] && [ -n "${stanza_config}" ]; then
@@ -205,6 +212,21 @@ while read -r stanza; do
 		else
 			stanza_config="${OVERRIDE_STANZA_CONFIG}";
 		fi;
+		# super user
+		OVERRIDE_STANZA_SUPER_USER=$(echo "${OVERRIDE_STANZA}" | awk -F':' '{print (NF>3) ? $4 : ""}');
+		if [ -z "${OVERRIDE_STANZA_SUPER_USER}" ] && [ -n "${stanza_super_user}" ]; then
+			OVERRIDE_STANZA_SUPER_USER="${stanza_super_user}";
+		else
+			stanza_super_user="${OVERRIDE_STANZA_SUPER_USER}";
+		fi;
+	fi;
+	# set override sudo user
+	if [ -n "${stanza_super_user}" ]; then
+		if ! id "${stanza_super_user}" &>/dev/null; then
+			echo "[!] Sudo user ${stanza_super_user} for stanza ${stanza_name} does not exist, skipping stanza";
+			continue;
+		fi;
+		sudo_user="${stanza_super_user}";
 	fi;
 	# build the call command
 	CALL=(

config/stanza.sample.cfg

@@ -3,3 +3,4 @@ stanza_a
 stanza_b:1
 stanza_b:2
 stanca_c::/path/to/config/file
+stanza_d:::super_user