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f6a77804c9
We do this checks as protection against bind mount cycles on the same file system. However, the check wasn't really effective for that, as it would only detect cycles A → B → A this way. By using fs_is_mount_point() we'll also detect cycles A → A. Also, while we are at it, make these file system boundary checks optional. This is not used anywhere, but might be eventually... Most importantly though add a longer blurb explanation the why.
35 lines
1.6 KiB
C
35 lines
1.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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***/
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#include <inttypes.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/types.h>
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typedef enum CopyFlags {
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COPY_REFLINK = 1U << 0, /* Try to reflink */
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COPY_MERGE = 1U << 1, /* Merge existing trees with our new one to copy */
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COPY_REPLACE = 1U << 2, /* Replace an existing file if there's one */
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COPY_SAME_MOUNT = 1U << 3, /* Don't descend recursively into other file systems, across mount point boundaries */
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} CopyFlags;
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int copy_file_fd(const char *from, int to, CopyFlags copy_flags);
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int copy_file(const char *from, const char *to, int open_flags, mode_t mode, unsigned chattr_flags, CopyFlags copy_flags);
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int copy_file_atomic(const char *from, const char *to, mode_t mode, unsigned chattr_flags, CopyFlags copy_flags);
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int copy_tree(const char *from, const char *to, uid_t override_uid, gid_t override_gid, CopyFlags copy_flags);
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int copy_tree_at(int fdf, const char *from, int fdt, const char *to, uid_t override_uid, gid_t override_gid, CopyFlags copy_flags);
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int copy_directory_fd(int dirfd, const char *to, CopyFlags copy_flags);
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int copy_directory(const char *from, const char *to, CopyFlags copy_flags);
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int copy_bytes_full(int fdf, int fdt, uint64_t max_bytes, CopyFlags copy_flags, void **ret_remains, size_t *ret_remains_size);
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static inline int copy_bytes(int fdf, int fdt, uint64_t max_bytes, CopyFlags copy_flags) {
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return copy_bytes_full(fdf, fdt, max_bytes, copy_flags, NULL, NULL);
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}
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int copy_times(int fdf, int fdt);
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int copy_xattr(int fdf, int fdt);
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