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Reapply "Handle symlinks in sbox"

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This reverts commit 69b5a5f0bf.

Bug: 307824623
Test: Presubmits
Change-Id: Id7dd1518ae6b04232c48c0aa138cad2c59b228c3
This commit is contained in:
Cole Faust 2023-12-08 11:09:31 -08:00
parent df1efd7251
commit 14a2362183
1 changed files with 23 additions and 2 deletions
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25
cmd/sbox/sbox.go
View file

@ -22,6 +22,7 @@ import (
"flag"
"fmt"
"io"
"io/fs"
"io/ioutil"
"os"
"os/exec"
@ -478,7 +479,8 @@ func copyFiles(copies []*sbox_proto.Copy, fromDir, toDir string, exists existsTy
// copyOneFile copies a file and its permissions. If forceExecutable is true it adds u+x to the
// permissions. If exists is allowFromNotExists it returns nil if the from path doesn't exist.
// If write is onlyWriteIfChanged then the output file is compared to the input file and not written to
// if it is the same, avoiding updating the timestamp.
// if it is the same, avoiding updating the timestamp. If from is a symlink, the symlink itself
// will be copied, instead of what it points to.
func copyOneFile(from string, to string, forceExecutable bool, exists existsType,
write writeType) error {
err := os.MkdirAll(filepath.Dir(to), 0777)
@ -486,7 +488,7 @@ func copyOneFile(from string, to string, forceExecutable bool, exists existsType
return err
}
stat, err := os.Stat(from)
stat, err := os.Lstat(from)
if err != nil {
if os.IsNotExist(err) && exists == allowFromNotExists {
return nil
@ -494,6 +496,25 @@ func copyOneFile(from string, to string, forceExecutable bool, exists existsType
return err
}
if stat.Mode()&fs.ModeSymlink != 0 {
linkTarget, err := os.Readlink(from)
if err != nil {
return err
}
if write == onlyWriteIfChanged {
toLinkTarget, err := os.Readlink(to)
if err == nil && toLinkTarget == linkTarget {
return nil
}
}
err = os.Remove(to)
if err != nil && !os.IsNotExist(err) {
return err
}
return os.Symlink(linkTarget, to)
}
perm := stat.Mode()
if forceExecutable {
perm = perm | 0100 // u+x