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copy: optionally, reproduce hardlinks from source in destination

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This is useful for duplicating trees that contain hardlinks: we keep
track of potential hardlinks and try to reproduce them within the
destination tree. (We do not hardlink between source and destination!).

This is useful for trees like ostree images which heavily use hardlinks
and which are otherwise exploded into separate copies of all files when
we duplicate the trees.
This commit is contained in:
Lennart Poettering
2020-09-09 20:21:29 +02:00
parent 197db625a3
commit dd480f7835
4 changed files with 274 additions and 23 deletions
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src/dissect/dissect.c
+3 -3
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@@ -627,7 +627,7 @@ static int action_copy(DissectedImage *m, LoopDevice *d) {
}
/* Try to copy as directory? */
r = copy_directory_fd(source_fd, arg_target, COPY_REFLINK|COPY_MERGE_EMPTY|COPY_SIGINT);
r = copy_directory_fd(source_fd, arg_target, COPY_REFLINK|COPY_MERGE_EMPTY|COPY_SIGINT|COPY_HARDLINKS);
if (r >= 0)
return 0;
if (r != -ENOTDIR)
@@ -699,9 +699,9 @@ static int action_copy(DissectedImage *m, LoopDevice *d) {
if (errno != ENOENT)
return log_error_errno(errno, "Failed to open destination '%s': %m", arg_target);
r = copy_tree_at(source_fd, ".", dfd, basename(arg_target), UID_INVALID, GID_INVALID, COPY_REFLINK|COPY_REPLACE|COPY_SIGINT);
r = copy_tree_at(source_fd, ".", dfd, basename(arg_target), UID_INVALID, GID_INVALID, COPY_REFLINK|COPY_REPLACE|COPY_SIGINT|COPY_HARDLINKS);
} else
r = copy_tree_at(source_fd, ".", target_fd, ".", UID_INVALID, GID_INVALID, COPY_REFLINK|COPY_REPLACE|COPY_SIGINT);
r = copy_tree_at(source_fd, ".", target_fd, ".", UID_INVALID, GID_INVALID, COPY_REFLINK|COPY_REPLACE|COPY_SIGINT|COPY_HARDLINKS);
if (r < 0)
return log_error_errno(r, "Failed to copy '%s' to '%s' in image '%s': %m", arg_source, arg_target, arg_image);