More support export logs (#102)

* Get Postgres logs from Primary and Replicas
* Get Postgres configuration files from PGDATA directory
* Get pgBackRest logs from DB host(s) and Repo hosts
* Store files in `pods/pod-name` directory
* Rename PGO log from `cli` to `cli.log`


---------

Co-authored-by: Philip Hurst <[email protected]>

Author: philrhurst

internal/cmd/exec.go

@@ -49,6 +49,39 @@ func (exec Executor) listPGLogFiles(numLogs int) (string, string, error) {
 	return stdout.String(), stderr.String(), err
 }
 
+// listPGConfFiles returns the full path of Postgres conf files.
+// These are the *.conf stored on the Postgres instance
+func (exec Executor) listPGConfFiles() (string, string, error) {
+	var stdout, stderr bytes.Buffer
+
+	command := "ls -1dt pgdata/pg[0-9][0-9]/*.conf"
+	err := exec(nil, &stdout, &stderr, "bash", "-ceu", "--", command)
+
+	return stdout.String(), stderr.String(), err
+}
+
+// listBackrestLogFiles returns the full path of pgBackRest log files.
+// These are the pgBackRest logs stored on the Postgres instance
+func (exec Executor) listBackrestLogFiles() (string, string, error) {
+	var stdout, stderr bytes.Buffer
+
+	command := "ls -1dt pgdata/pgbackrest/log/*"
+	err := exec(nil, &stdout, &stderr, "bash", "-ceu", "--", command)
+
+	return stdout.String(), stderr.String(), err
+}
+
+// listBackrestRepoHostLogFiles returns the full path of pgBackRest log files.
+// These are the pgBackRest logs stored on the repo host
+func (exec Executor) listBackrestRepoHostLogFiles() (string, string, error) {
+	var stdout, stderr bytes.Buffer
+
+	command := "ls -1dt pgbackrest/*/log/*"
+	err := exec(nil, &stdout, &stderr, "bash", "-ceu", "--", command)
+
+	return stdout.String(), stderr.String(), err
+}
+
 // catFile takes the full path of a file and returns the contents
 // of that file
 func (exec Executor) catFile(filePath string) (string, string, error) {