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Add 'environment' package

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This commit adds a new environment package that manages all calls to the
underlying operating system.
This commit is contained in:
Tom Wiesing 2022-09-18 14:24:22 +02:00
parent 822c70cd69
commit f19619ef9f
No known key found for this signature in database
60 changed files with 539 additions and 308 deletions
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27
pkg/unpack/resource.go
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@ -3,9 +3,9 @@ package unpack
import (
"io"
"io/fs"
"os"
"path/filepath"
"github.com/FAU-CDI/wisski-distillery/pkg/environment"
"github.com/pkg/errors"
)
@ -16,9 +16,9 @@ var errExpectedDirectoryButGotFile = errors.New("expected a directory, but got a
//
// onInstallFile is called for each file or directory being installed.
//
// If the destination path does not exist, it is created using [os.MakeDirs]
// If the destination path does not exist, it is created using [environment.MakeDirs]
// The directory is installed recursively.
func InstallDir(dst string, src string, fsys fs.FS, onInstallFile func(dst, src string)) error {
func InstallDir(env environment.Environment, dst string, src string, fsys fs.FS, onInstallFile func(dst, src string)) error {
// open the source file
srcFile, err := fsys.Open(src)
if err != nil {
@ -43,14 +43,14 @@ func InstallDir(dst string, src string, fsys fs.FS, onInstallFile func(dst, src
// do the installation of the directory.
// the type cast should be safe.
return installDir(dst, srcInfo, srcFile.(fs.ReadDirFile), src, fsys, onInstallFile)
return installDir(env, dst, srcInfo, srcFile.(fs.ReadDirFile), src, fsys, onInstallFile)
}
// installResource installs the resource at src within fsys to dst.
//
// OnInstallFile is called for each source and destination file.
// OnInstallFile may be nil.
func installResource(dst string, src string, fsys fs.FS, onInstallFile func(dst, src string)) error {
func installResource(env environment.Environment, dst string, src string, fsys fs.FS, onInstallFile func(dst, src string)) error {
// open the srcFile
srcFile, err := fsys.Open(src)
if err != nil {
@ -71,19 +71,19 @@ func installResource(dst string, src string, fsys fs.FS, onInstallFile func(dst,
// this is a directory, so the cast is safe!
if srcInfo.IsDir() {
return installDir(dst, srcInfo, srcFile.(fs.ReadDirFile), src, fsys, onInstallFile)
return installDir(env, dst, srcInfo, srcFile.(fs.ReadDirFile), src, fsys, onInstallFile)
}
// this is a regular file!
return installFile(dst, srcInfo, srcFile)
return installFile(env, dst, srcInfo, srcFile)
}
func installDir(dst string, srcInfo fs.FileInfo, srcFile fs.ReadDirFile, src string, fsys fs.FS, onInstallFile func(dst, src string)) error {
func installDir(env environment.Environment, dst string, srcInfo fs.FileInfo, srcFile fs.ReadDirFile, src string, fsys fs.FS, onInstallFile func(dst, src string)) error {
// create the destination
dstStat, dstErr := os.Stat(dst)
dstStat, dstErr := env.Stat(dst)
switch {
case os.IsNotExist(dstErr):
if err := os.MkdirAll(dst, srcInfo.Mode()); err != nil {
case environment.IsNotExist(dstErr):
if err := env.MkdirAll(dst, srcInfo.Mode()); err != nil {
return errors.Wrapf(err, "Error creating destination directory %s", dst)
}
case dstErr != nil:
@ -105,6 +105,7 @@ func installDir(dst string, srcInfo fs.FileInfo, srcFile fs.ReadDirFile, src str
// iterate over all the children
for _, entry := range entries {
if err := installResource(
env,
filepath.Join(dst, entry.Name()),
filepath.Join(src, entry.Name()),
fsys,
@ -117,9 +118,9 @@ func installDir(dst string, srcInfo fs.FileInfo, srcFile fs.ReadDirFile, src str
return nil
}
func installFile(dst string, srcInfo fs.FileInfo, src fs.File) error {
func installFile(env environment.Environment, dst string, srcInfo fs.FileInfo, src fs.File) error {
// create the file using the right mode!
file, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, srcInfo.Mode())
file, err := env.Create(dst, srcInfo.Mode())
if err != nil {
return err
}