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exec.go
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exec.go
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// Copyright 2021 - 2024 Crunchy Data Solutions, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"bytes"
"fmt"
"io"
)
// Executor calls commands
type Executor func(
stdin io.Reader, stdout, stderr io.Writer, command ...string,
) error
// pgBackRestInfo defines a pgBackRest info command with relevant flags set
func (exec Executor) pgBackRestInfo(output, repoNum string) (string, string, error) {
var stdout, stderr bytes.Buffer
var command string
command = "pgbackrest info --output=" + output
if repoNum != "" {
command += " --repo=" + repoNum
}
err := exec(nil, &stdout, &stderr, "bash", "-ceu", "--", command)
return stdout.String(), stderr.String(), err
}
// postgresqlListLogFiles returns the full path of numLogs log files.
func (exec Executor) listPGLogFiles(numLogs int) (string, string, error) {
var stdout, stderr bytes.Buffer
command := fmt.Sprintf("ls -1dt pgdata/pg[0-9][0-9]/log/* | head -%d", numLogs)
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) {
var stdout, stderr bytes.Buffer
command := fmt.Sprintf("cat %s", filePath)
err := exec(nil, &stdout, &stderr, "bash", "-ceu", "--", command)
return stdout.String(), stderr.String(), err
}
// patronictl takes a patronictl subcommand and returns the output of that command
func (exec Executor) patronictl(cmd, output string) (string, string, error) {
var stdout, stderr bytes.Buffer
command := "patronictl " + cmd
if output != "" {
command += " --format " + output
}
err := exec(nil, &stdout, &stderr, "bash", "-ceu", "--", command)
return stdout.String(), stderr.String(), err
}
// processes returns the output of a ps command
func (exec Executor) processes() (string, string, error) {
var stdout, stderr bytes.Buffer
command := "ps aux --width 500"
err := exec(nil, &stdout, &stderr, "bash", "-ceu", "--", command)
return stdout.String(), stderr.String(), err
}
// systemTime returns the output of the date command
func (exec Executor) systemTime() (string, string, error) {
var stdout, stderr bytes.Buffer
err := exec(nil, &stdout, &stderr, "date")
return stdout.String(), stderr.String(), err
}