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metadata.go
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metadata.go
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// Copyright (c) Contributors to the Apptainer project, established as
// Apptainer a Series of LF Projects LLC.
// For website terms of use, trademark policy, privacy policy and other
// project policies see https://lfprojects.org/policies
// Copyright (c) 2018-2022, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package build
import (
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
"time"
"github.com/apptainer/apptainer/internal/pkg/buildcfg"
"github.com/apptainer/apptainer/pkg/build/types"
"github.com/apptainer/apptainer/pkg/build/types/parser"
"github.com/apptainer/apptainer/pkg/image"
"github.com/apptainer/apptainer/pkg/inspect"
"github.com/apptainer/apptainer/pkg/sylog"
)
func (s *stage) insertMetadata() error {
// insert help
if err := insertHelpScript(s.b); err != nil {
return fmt.Errorf("while inserting help script: %v", err)
}
// insert labels
if err := insertLabelsJSON(s.b); err != nil {
return fmt.Errorf("while inserting labels json: %v", err)
}
// insert definition
if err := insertDefinition(s.b); err != nil {
return fmt.Errorf("while inserting definition: %v", err)
}
// insert environment
if err := insertEnvScript(s.b); err != nil {
return fmt.Errorf("while inserting environment script: %v", err)
}
// insert startscript
if err := insertStartScript(s.b); err != nil {
return fmt.Errorf("while inserting startscript: %v", err)
}
// insert runscript
if err := insertRunScript(s.b); err != nil {
return fmt.Errorf("while inserting runscript: %v", err)
}
// insert test script
if err := insertTestScript(s.b); err != nil {
return fmt.Errorf("while inserting test script: %v", err)
}
// insert JSON inspect metadata (must be the last call)
if err := insertJSONInspectMetadata(s.b); err != nil {
return fmt.Errorf("while inserting JSON inspect metadata: %v", err)
}
return nil
}
func insertEnvScript(b *types.Bundle) error {
if b.RunSection("environment") && b.Recipe.ImageData.Environment.Script != "" {
sylog.Infof("Adding environment to container")
envScriptPath := filepath.Join(b.RootfsPath, "/.singularity.d/env/90-environment.sh")
_, err := os.Stat(envScriptPath)
if os.IsNotExist(err) {
err := os.WriteFile(envScriptPath, []byte("#!/bin/sh\n\n"+b.Recipe.ImageData.Environment.Script+"\n"), 0o755)
if err != nil {
return err
}
} else {
// append to script if it already exists
f, err := os.OpenFile(envScriptPath, os.O_APPEND|os.O_WRONLY, 0o755)
if err != nil {
return err
}
defer f.Close()
_, err = f.WriteString("\n" + b.Recipe.ImageData.Environment.Script + "\n")
if err != nil {
return err
}
}
}
return nil
}
// runscript and startscript should use this function to properly handle args and shebangs
func handleShebangScript(s types.Script) (string, string) {
shebang := "#!/bin/sh"
script := ""
if strings.HasPrefix(strings.TrimSpace(s.Script), "#!") {
// separate and cleanup shebang
split := strings.SplitN(s.Script, "\n", 2)
shebang = strings.TrimSpace(split[0])
if len(split) == 2 {
script = split[1]
}
} else {
script = s.Script
}
if s.Args != "" {
// add arg after trimming comments
shebang += " " + strings.Split(s.Args, "#")[0]
}
return shebang, script
}
func insertRunScript(b *types.Bundle) error {
if b.RunSection("runscript") && b.Recipe.ImageData.Runscript.Script != "" {
sylog.Infof("Adding runscript")
shebang, script := handleShebangScript(b.Recipe.ImageData.Runscript)
err := os.WriteFile(filepath.Join(b.RootfsPath, "/.singularity.d/runscript"), []byte(shebang+"\n\n"+script+"\n"), 0o755)
if err != nil {
return err
}
}
return nil
}
func insertStartScript(b *types.Bundle) error {
if b.RunSection("startscript") && b.Recipe.ImageData.Startscript.Script != "" {
sylog.Infof("Adding startscript")
shebang, script := handleShebangScript(b.Recipe.ImageData.Startscript)
err := os.WriteFile(filepath.Join(b.RootfsPath, "/.singularity.d/startscript"), []byte(shebang+"\n\n"+script+"\n"), 0o755)
if err != nil {
return err
}
}
return nil
}
func insertTestScript(b *types.Bundle) error {
if b.RunSection("test") && b.Recipe.ImageData.Test.Script != "" {
sylog.Infof("Adding testscript")
shebang, script := handleShebangScript(b.Recipe.ImageData.Test)
err := os.WriteFile(filepath.Join(b.RootfsPath, "/.singularity.d/test"), []byte(shebang+"\n\n"+script+"\n"), 0o755)
if err != nil {
return err
}
}
return nil
}
func insertHelpScript(b *types.Bundle) error {
if b.RunSection("help") && b.Recipe.ImageData.Help.Script != "" {
_, err := os.Stat(filepath.Join(b.RootfsPath, "/.singularity.d/runscript.help"))
if err != nil || b.Opts.Force {
sylog.Infof("Adding help info")
err := os.WriteFile(filepath.Join(b.RootfsPath, "/.singularity.d/runscript.help"), []byte(b.Recipe.ImageData.Help.Script+"\n"), 0o644)
if err != nil {
return err
}
} else {
sylog.Warningf("Help message already exists and force option is false, not overwriting")
}
}
return nil
}
func insertDefinition(b *types.Bundle) error {
// Check for existing definition and move it to bootstrap history
if _, err := os.Stat(filepath.Join(b.RootfsPath, "/.singularity.d/Singularity")); err == nil {
// make bootstrap_history directory if it doesn't exist
if _, err := os.Stat(filepath.Join(b.RootfsPath, "/.singularity.d/bootstrap_history")); err != nil {
err = os.Mkdir(filepath.Join(b.RootfsPath, "/.singularity.d/bootstrap_history"), 0o755)
if err != nil {
return err
}
}
// look at number of files in bootstrap_history to give correct file name
files, err := os.ReadDir(filepath.Join(b.RootfsPath, "/.singularity.d/bootstrap_history"))
if err != nil {
return err
}
// name is "Apptainer" concatenated with an index based on number of other files in bootstrap_history
len := strconv.Itoa(len(files))
histName := "Apptainer" + len
// move old definition into bootstrap_history
err = os.Rename(filepath.Join(b.RootfsPath, "/.singularity.d/Singularity"), filepath.Join(b.RootfsPath, "/.singularity.d/bootstrap_history", histName))
if err != nil {
return err
}
}
err := os.WriteFile(filepath.Join(b.RootfsPath, "/.singularity.d/Singularity"), b.Recipe.FullRaw, 0o644)
if err != nil {
return err
}
return nil
}
func insertLabelsJSON(b *types.Bundle) (err error) {
var text []byte
labels := make(map[string]string)
if err = getExistingLabels(labels, b); err != nil {
return err
}
// get labels added through APPTAINER_LABELS environment variables
buildLabels := filepath.Join(b.RootfsPath, sLabelsPath)
content, err := os.ReadFile(buildLabels)
if err == nil {
if err := os.Remove(filepath.Join(b.RootfsPath, sLabelsPath)); err != nil {
return err
}
for k, v := range parser.GetLabels(string(content)) {
labels[k] = v
}
} else if !os.IsNotExist(err) {
return fmt.Errorf("while reading %s: %s", buildLabels, err)
}
if err = addBuildLabels(labels, b); err != nil {
return err
}
if b.RunSection("labels") && len(b.Recipe.ImageData.Labels) > 0 {
sylog.Infof("Adding labels")
// add new labels to new map and check for collisions
for key, value := range b.Recipe.ImageData.Labels {
// check if label already exists
if _, ok := labels[key]; ok {
// overwrite collision if it exists and force flag is set
if b.Opts.Force {
labels[key] = value
} else {
sylog.Warningf("Label: %s already exists and force option is false, not overwriting", key)
}
} else {
// set if it doesn't
labels[key] = value
}
}
}
// make new map into json
text, err = json.MarshalIndent(labels, "", "\t")
if err != nil {
return err
}
err = os.WriteFile(filepath.Join(b.RootfsPath, "/.singularity.d/labels.json"), []byte(text), 0o644)
return err
}
func insertJSONInspectMetadata(b *types.Bundle) error {
metadata := new(inspect.Metadata)
exe := filepath.Join(buildcfg.BINDIR, "apptainer")
cmd := exec.Command(exe, "inspect", "--all", b.RootfsPath)
cmd.Stderr = os.Stderr
out, err := cmd.Output()
if err != nil {
return fmt.Errorf("while executing inspect command: %s", err)
}
if err := json.Unmarshal(out, metadata); err != nil {
return fmt.Errorf("while decoding inspect metadata: %s", err)
}
data, err := json.Marshal(metadata)
if err != nil {
return fmt.Errorf("while encoding inspect metadata: %s", err)
}
b.JSONObjects[image.SIFDescInspectMetadataJSON] = data
return nil
}
func getExistingLabels(labels map[string]string, b *types.Bundle) error {
// check for existing labels in bundle
if _, err := os.Stat(filepath.Join(b.RootfsPath, "/.singularity.d/labels.json")); err == nil {
jsonFile, err := os.Open(filepath.Join(b.RootfsPath, "/.singularity.d/labels.json"))
if err != nil {
return err
}
defer jsonFile.Close()
jsonBytes, err := io.ReadAll(jsonFile)
if err != nil {
return err
}
err = json.Unmarshal(jsonBytes, &labels)
if err != nil {
return err
}
}
return nil
}
func addBuildLabels(labels map[string]string, b *types.Bundle) error {
// schema version
labels["org.label-schema.schema-version"] = "1.0"
// build date and time, lots of time formatting
currentTime := time.Now()
year, month, day := currentTime.Date()
date := strconv.Itoa(day) + `_` + month.String() + `_` + strconv.Itoa(year)
hour, min, sec := currentTime.Clock()
time := strconv.Itoa(hour) + `:` + strconv.Itoa(min) + `:` + strconv.Itoa(sec)
zone, _ := currentTime.Zone()
timeString := currentTime.Weekday().String() + `_` + date + `_` + time + `_` + zone
labels["org.label-schema.build-date"] = timeString
// apptainer version
labels["org.label-schema.usage.apptainer.version"] = buildcfg.PACKAGE_VERSION
// help info if help exists in the definition and is run in the build
if b.RunSection("help") && b.Recipe.ImageData.Help.Script != "" {
labels["org.label-schema.usage"] = "/.singularity.d/runscript.help"
labels["org.label-schema.usage.apptainer.runscript.help"] = "/.singularity.d/runscript.help"
}
// bootstrap header info, only if this build actually bootstrapped
if !b.Opts.Update || b.Opts.Force {
for key, value := range b.Recipe.Header {
labels["org.label-schema.usage.singularity.deffile."+key] = value
}
}
// Architecture of build
// Local builds currently always use the host architecture.
labels["org.label-schema.build-arch"] = runtime.GOARCH
return nil
}