42 lines
1.1 KiB
Go
42 lines
1.1 KiB
Go
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//go:build !windows && !plan9 && !js && !linux
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package local
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import (
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"os"
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"syscall"
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"golang.org/x/sys/unix"
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)
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const haveLChmod = true
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// syscallMode returns the syscall-specific mode bits from Go's portable mode bits.
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//
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// Borrowed from the syscall source since it isn't public.
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func syscallMode(i os.FileMode) (o uint32) {
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o |= uint32(i.Perm())
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if i&os.ModeSetuid != 0 {
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o |= syscall.S_ISUID
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}
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if i&os.ModeSetgid != 0 {
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o |= syscall.S_ISGID
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}
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if i&os.ModeSticky != 0 {
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o |= syscall.S_ISVTX
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}
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return o
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}
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// lChmod changes the mode of the named file to mode. If the file is a symbolic
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// link, it changes the link, not the target. If there is an error,
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// it will be of type *PathError.
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func lChmod(name string, mode os.FileMode) error {
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// NB linux does not support AT_SYMLINK_NOFOLLOW as a parameter to fchmodat
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// and returns ENOTSUP if you try, so we don't support this on linux
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if e := unix.Fchmodat(unix.AT_FDCWD, name, syscallMode(mode), unix.AT_SYMLINK_NOFOLLOW); e != nil {
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return &os.PathError{Op: "lChmod", Path: name, Err: e}
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}
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return nil
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}
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