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+/* core functions for copying files and directories
+   Copyright (C) 1989-2022 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Extracted from cp.c and librarified by Jim Meyering.  */
+
+#ifndef COPY_H
+# define COPY_H
+
+# include <stdbool.h>
+# include "hash.h"
+
+struct selabel_handle;
+
+/* Control creation of sparse files (files with holes).  */
+enum Sparse_type
+{
+  SPARSE_UNUSED,
+
+  /* Never create holes in DEST.  */
+  SPARSE_NEVER,
+
+  /* This is the default.  Use a crude (and sometimes inaccurate)
+     heuristic to determine if SOURCE has holes.  If so, try to create
+     holes in DEST.  */
+  SPARSE_AUTO,
+
+  /* For every sufficiently long sequence of bytes in SOURCE, try to
+     create a corresponding hole in DEST.  There is a performance penalty
+     here because CP has to search for holes in SRC.  But if the holes are
+     big enough, that penalty can be offset by the decrease in the amount
+     of data written to the file system.   */
+  SPARSE_ALWAYS
+};
+
+/* Control creation of COW files.  */
+enum Reflink_type
+{
+  /* Do a standard copy.  */
+  REFLINK_NEVER,
+
+  /* Try a COW copy and fall back to a standard copy; this is the default.  */
+  REFLINK_AUTO,
+
+  /* Require a COW copy and fail if not available.  */
+  REFLINK_ALWAYS
+};
+
+/* This type is used to help mv (via copy.c) distinguish these cases.  */
+enum Interactive
+{
+  I_ALWAYS_YES = 1,
+  I_ALWAYS_NO,
+  I_ASK_USER,
+  I_UNSPECIFIED
+};
+
+/* How to handle symbolic links.  */
+enum Dereference_symlink
+{
+  DEREF_UNDEFINED = 1,
+
+  /* Copy the symbolic link itself.  -P  */
+  DEREF_NEVER,
+
+  /* If the symbolic is a command line argument, then copy
+     its referent.  Otherwise, copy the symbolic link itself.  -H  */
+  DEREF_COMMAND_LINE_ARGUMENTS,
+
+  /* Copy the referent of the symbolic link.  -L  */
+  DEREF_ALWAYS
+};
+
+# define VALID_SPARSE_MODE(Mode)	\
+  ((Mode) == SPARSE_NEVER		\
+   || (Mode) == SPARSE_AUTO		\
+   || (Mode) == SPARSE_ALWAYS)
+
+# define VALID_REFLINK_MODE(Mode)	\
+  ((Mode) == REFLINK_NEVER		\
+   || (Mode) == REFLINK_AUTO		\
+   || (Mode) == REFLINK_ALWAYS)
+
+/* These options control how files are copied by at least the
+   following programs: mv (when rename doesn't work), cp, install.
+   So, if you add a new member, be sure to initialize it in
+   mv.c, cp.c, and install.c.  */
+struct cp_options
+{
+  enum backup_type backup_type;
+
+  /* How to handle symlinks in the source.  */
+  enum Dereference_symlink dereference;
+
+  /* This value is used to determine whether to prompt before removing
+     each existing destination file.  It works differently depending on
+     whether move_mode is set.  See code/comments in copy.c.  */
+  enum Interactive interactive;
+
+  /* Control creation of sparse files.  */
+  enum Sparse_type sparse_mode;
+
+  /* Set the mode of the destination file to exactly this value
+     if SET_MODE is nonzero.  */
+  mode_t mode;
+
+  /* If true, copy all files except (directories and, if not dereferencing
+     them, symbolic links,) as if they were regular files.  */
+  bool copy_as_regular;
+
+  /* If true, remove each existing destination nondirectory before
+     trying to open it.  */
+  bool unlink_dest_before_opening;
+
+  /* If true, first try to open each existing destination nondirectory,
+     then, if the open fails, unlink and try again.
+     This option must be set for 'cp -f', in case the destination file
+     exists when the open is attempted.  It is irrelevant to 'mv' since
+     any destination is sure to be removed before the open.  */
+  bool unlink_dest_after_failed_open;
+
+  /* If true, create hard links instead of copying files.
+     Create destination directories as usual. */
+  bool hard_link;
+
+  /* If true, rather than copying, first attempt to use rename.
+     If that fails, then resort to copying.  */
+  bool move_mode;
+
+  /* If true, install(1) is the caller.  */
+  bool install_mode;
+
+  /* Whether this process has appropriate privileges to chown a file
+     whose owner is not the effective user ID.  */
+  bool chown_privileges;
+
+  /* Whether this process has appropriate privileges to do the
+     following operations on a file even when it is owned by some
+     other user: set the file's atime, mtime, mode, or ACL; remove or
+     rename an entry in the file even though it is a sticky directory,
+     or to mount on the file.  */
+  bool owner_privileges;
+
+  /* If true, when copying recursively, skip any subdirectories that are
+     on different file systems from the one we started on.  */
+  bool one_file_system;
+
+  /* If true, attempt to give the copies the original files' permissions,
+     owner, group, and timestamps. */
+  bool preserve_ownership;
+  bool preserve_mode;
+  bool preserve_timestamps;
+  bool explicit_no_preserve_mode;
+
+  /* If non-null, attempt to set specified security context */
+  struct selabel_handle *set_security_context;
+
+  /* Enabled for mv, and for cp by the --preserve=links option.
+     If true, attempt to preserve in the destination files any
+     logical hard links between the source files.  If used with cp's
+     --no-dereference option, and copying two hard-linked files,
+     the two corresponding destination files will also be hard linked.
+
+     If used with cp's --dereference (-L) option, then, as that option implies,
+     hard links are *not* preserved.  However, when copying a file F and
+     a symlink S to F, the resulting S and F in the destination directory
+     will be hard links to the same file (a copy of F).  */
+  bool preserve_links;
+
+  /* Optionally don't copy the data, either with CoW reflink files or
+     explicitly with the --attributes-only option.  */
+  bool data_copy_required;
+
+  /* If true and any of the above (for preserve) file attributes cannot
+     be applied to a destination file, treat it as a failure and return
+     nonzero immediately.  E.g. for cp -p this must be true, for mv it
+     must be false.  */
+  bool require_preserve;
+
+  /* If true, attempt to preserve the SELinux security context, too.
+     Set this only if the kernel is SELinux enabled.  */
+  bool preserve_security_context;
+
+  /* Useful only when preserve_context is true.
+     If true, a failed attempt to preserve file's security context
+     propagates failure "out" to the caller, along with full diagnostics.
+     If false, a failure to preserve file's security context does not
+     change the invoking application's exit status, but may output diagnostics.
+     For example, with 'cp --preserve=context' this flag is "true",
+     while with 'cp --preserve=all' or 'cp -a', it is "false". */
+  bool require_preserve_context;
+
+  /* If true, attempt to preserve extended attributes using libattr.
+     Ignored if coreutils are compiled without xattr support. */
+  bool preserve_xattr;
+
+  /* Useful only when preserve_xattr is true.
+     If true, a failed attempt to preserve file's extended attributes
+     propagates failure "out" to the caller, along with full diagnostics.
+     If false, a failure to preserve file's extended attributes does not
+     change the invoking application's exit status, but may output diagnostics.
+     For example, with 'cp --preserve=xattr' this flag is "true",
+     while with 'cp --preserve=all' or 'cp -a', it is "false". */
+  bool require_preserve_xattr;
+
+  /* This allows us to output warnings in cases 2 and 4 below,
+     while being quiet for case 1 (when reduce_diagnostics is true).
+       1. cp -a                       try to copy xattrs with no errors
+       2. cp --preserve=all           copy xattrs with all but ENOTSUP warnings
+       3. cp --preserve=xattr,context copy xattrs with all errors
+       4. mv                          copy xattrs with all but ENOTSUP warnings
+   */
+  bool reduce_diagnostics;
+
+  /* If true, copy directories recursively and copy special files
+     as themselves rather than copying their contents. */
+  bool recursive;
+
+  /* If true, set file mode to value of MODE.  Otherwise,
+     set it based on current umask modified by UMASK_KILL.  */
+  bool set_mode;
+
+  /* If true, create symbolic links instead of copying files.
+     Create destination directories as usual. */
+  bool symbolic_link;
+
+  /* If true, do not copy a nondirectory that has an existing destination
+     with the same or newer modification time. */
+  bool update;
+
+  /* If true, display the names of the files before copying them. */
+  bool verbose;
+
+  /* If true, stdin is a tty.  */
+  bool stdin_tty;
+
+  /* If true, open a dangling destination symlink when not in move_mode.
+     Otherwise, copy_reg gives a diagnostic (it refuses to write through
+     such a symlink) and returns false.  */
+  bool open_dangling_dest_symlink;
+
+  /* If true, this is the last filed to be copied.  mv uses this to
+     avoid some unnecessary work.  */
+  bool last_file;
+
+  /* Zero if the source has already been renamed to the destination; a
+     positive errno number if this failed with the given errno; -1 if
+     no attempt has been made to rename.  Always -1, except for mv.  */
+  int rename_errno;
+
+  /* Control creation of COW files.  */
+  enum Reflink_type reflink_mode;
+
+  /* This is a set of destination name/inode/dev triples.  Each such triple
+     represents a file we have created corresponding to a source file name
+     that was specified on the command line.  Use it to avoid clobbering
+     source files in commands like this:
+       rm -rf a b c; mkdir a b c; touch a/f b/f; mv a/f b/f c
+     For now, it protects only regular files when copying (i.e., not renaming).
+     When renaming, it protects all non-directories.
+     Use dest_info_init to initialize it, or set it to NULL to disable
+     this feature.  */
+  Hash_table *dest_info;
+
+  /* FIXME */
+  Hash_table *src_info;
+};
+
+/* Arrange to make rename calls go through the wrapper function
+   on systems with a rename function that fails for a source file name
+   specified with a trailing slash.  */
+# if RENAME_TRAILING_SLASH_BUG
+int rpl_rename (char const *, char const *);
+#  undef rename
+#  define rename rpl_rename
+# endif
+
+bool copy (char const *src_name, char const *dst_name,
+           int dst_dirfd, char const *dst_relname,
+           int nonexistent_dst, const struct cp_options *options,
+           bool *copy_into_self, bool *rename_succeeded)
+  _GL_ATTRIBUTE_NONNULL ((1, 2, 4, 6, 7));
+
+extern bool set_process_security_ctx (char const *src_name,
+                                      char const *dst_name,
+                                      mode_t mode, bool new_dst,
+                                      const struct cp_options *x)
+  _GL_ATTRIBUTE_NONNULL ();
+
+extern bool set_file_security_ctx (char const *dst_name,
+                                   bool recurse, const struct cp_options *x)
+  _GL_ATTRIBUTE_NONNULL ();
+
+void dest_info_init (struct cp_options *) _GL_ATTRIBUTE_NONNULL ();
+void dest_info_free (struct cp_options *) _GL_ATTRIBUTE_NONNULL ();
+void src_info_init (struct cp_options *) _GL_ATTRIBUTE_NONNULL ();
+void src_info_free (struct cp_options *) _GL_ATTRIBUTE_NONNULL ();
+
+void cp_options_default (struct cp_options *) _GL_ATTRIBUTE_NONNULL ();
+bool chown_failure_ok (struct cp_options const *)
+  _GL_ATTRIBUTE_NONNULL () _GL_ATTRIBUTE_PURE;
+mode_t cached_umask (void);
+
+#endif