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Fix _copyDirectoryMetadata compilation error on FreeBSD #1121

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Fix _copyDirectoryMetadata compilation error on FreeBSD #1121

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40 changes: 40 additions & 0 deletions Sources/FoundationEssentials/FileManager/FileOperations.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -960,6 +960,45 @@ enum _FileOperations {
private static func _copyDirectoryMetadata(srcFD: CInt, srcPath: @autoclosure () -> String, dstFD: CInt, dstPath: @autoclosure () -> String, delegate: some LinkOrCopyDelegate) throws {
#if !os(WASI) && !os(Android)
// Copy extended attributes
#if os(FreeBSD)
// FreeBSD uses the `extattr_*` calls for setting extended attributes. Unlike like, the namespace for the extattrs are not determined by prefix of the attribute
for namespace in [EXTATTR_NAMESPACE_SYSTEM, EXTATTR_NAMESPACE_USER] {
// if we don't have permission to list attributes in system namespace, this returns -1 and skips it
var size = extattr_list_fd(srcFD, namespace, nil, 0)
if size > 0 {
try withUnsafeTemporaryAllocation(of: CChar.self, capacity: size + 1) { keyList in
// The list of entry returns by `extattr_list_*` contains the length(1 byte) of the attribute name, follow by the Non-NULL terminated attribute name. (See exattr(2))
size = extattr_list_fd(srcFD, namespace, keyList.baseAddress!, size)
var keyLength = Int(keyList.baseAddress!.pointee)
var current = keyList.baseAddress!.advanced(by: 1)
let end = keyList.baseAddress!.advanced(by: keyList.count)
keyList.baseAddress!.advanced(by: size).pointee = 0

while current < end {
let nextEntry = current.advanced(by: keyLength)
// get the length of next key, if this is the last entry, this points to the explicitly zerod byte at `end`.
keyLength = Int(nextEntry.pointee)
// zero the length field of the next name, so current name can pass in as a null-terminated string
nextEntry.pointee = 0
// this also set `current` to `end` after iterating all entries
defer { current = nextEntry.advanced(by: 1) }

var valueSize = extattr_get_fd(srcFD, namespace, current, nil, 0)
if valueSize >= 0 {
try withUnsafeTemporaryAllocation(of: UInt8.self, capacity: valueSize) { valueBuffer in
valueSize = extattr_get_fd(srcFD, namespace, current, valueBuffer.baseAddress!, valueSize)
if valueSize >= 0 {
if extattr_set_fd(srcFD, namespace, current, valueBuffer.baseAddress!, valueSize) != 0 {
try delegate.throwIfNecessary(errno, srcPath(), dstPath())
}
}
}
}
}
}
}
}
#else
var size = flistxattr(srcFD, nil, 0)
if size > 0 {
try withUnsafeTemporaryAllocation(of: CChar.self, capacity: size) { keyList in
Expand All @@ -985,6 +1024,7 @@ enum _FileOperations {
}
}
#endif
#endif
var statInfo = stat()
if fstat(srcFD, &statInfo) == 0 {
#if !os(WASI) // WASI doesn't have fchown for now
Expand Down