btrfs-progs: receive: handle root subvol path in clone

testcase:
    # ro subvol /src/parent
    # rw subvol /src/foo
    clone /src/parent/file /src/foo/file
    subvol snapshot -r /src/foo /src/foo.snap

    # generates a "clone parent/file -> foo.snap/file" send command
    send -p /src/parent /src/foo.snap

    # target fs:
    #    dest/
    #        |--- parent/...
    # mounted with -o subvol=dest, such that "parent" is at <target>/parent
    receive <target>

result:
    ERROR: cannot open dest/parent/file: No such file or directory

expected:
    "dest/" get's stripped from the clone source path to get the actual
    path in the target fs, if reachable from the mount point/chroot.

    This is exactly what process_snapshot does, which gets called on
    _every_ incremental receive and I'm quite certain is correct in
    doing so

Signed-off-by: Benedikt Morbach <benedikt.morbach@googlemail.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 18 insertions, 1 deletions

diff --git a/cmds-receive.c b/cmds-receive.c
index 06e61773..6cf22637 100644
--- a/cmds-receive.c
+++ b/cmds-receive.c
@@ -783,7 +783,24 @@ static int process_clone(const char *path, u64 offset, u64 len,
 						r->subvol_parent_name);
 			}
 		}*/
-		subvol_path = strdup(si->path);
+
+		/* strip the subvolume that we are receiving to from the start of subvol_path */
+		if (rctx->full_root_path) {
+			size_t root_len = strlen(rctx->full_root_path);
+			size_t sub_len = strlen(si->path);
+
+			if (sub_len > root_len &&
+			    strstr(si->path, rctx->full_root_path) == si->path &&
+			    si->path[root_len] == '/') {
+				subvol_path = strdup(si->path + root_len + 1);
+			} else {
+				error("clone: source subvol path %s unreachable from %s",
+					si->path, rctx->full_root_path);
+				goto out;
+			}
+		} else {
+			subvol_path = strdup(si->path);
+		}
 	}
 
 	ret = path_cat_out(full_clone_path, subvol_path, clone_path);