1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
use cid::Cid;
use std::convert::TryFrom;
use std::fmt;
use std::io::{Error as IoError, Read};
use std::path::{Path, PathBuf};
fn main() {
let cid = match std::env::args().nth(1).map(Cid::try_from) {
Some(Ok(cid)) => cid,
Some(Err(e)) => {
eprintln!("Invalid cid given as argument: {e}");
std::process::exit(1);
}
None => {
eprintln!("USAGE: {} CID\n", std::env::args().next().unwrap());
eprintln!(
"Will walk the unixfs file pointed out by the CID from default go-ipfs 0.5 \
configuration flatfs blockstore and write listing to stdout."
);
std::process::exit(0);
}
};
let ipfs_path = match std::env::var("IPFS_PATH") {
Ok(s) => s,
Err(e) => {
eprintln!("IPFS_PATH is not set or could not be read: {e}");
std::process::exit(1);
}
};
let mut blocks = PathBuf::from(ipfs_path);
blocks.push("blocks");
let blockstore = ShardedBlockStore { root: blocks };
match walk(blockstore, &cid) {
Ok(()) => {}
Err(Error::OpeningFailed(e)) => {
eprintln!("{e}\n");
eprintln!("This is likely caused by either:");
eprintln!(" - ipfs does not have the block");
eprintln!(" - ipfs is configured to use non-flatfs storage");
eprintln!(" - ipfs is configured to use flatfs with different sharding");
std::process::exit(1);
}
Err(e) => {
eprintln!("Failed to walk the merkle tree: {e}");
std::process::exit(1);
}
}
}
fn walk(blocks: ShardedBlockStore, start: &Cid) -> Result<(), Error> {
use rust_unixfs::walk::{ContinuedWalk, Walker};
let mut buf = Vec::new();
let mut cache = None;
let mut walker = Walker::new(start.to_owned(), String::new());
while walker.should_continue() {
buf.clear();
// Note: if you bind the pending or the "prefetchable", it must be dropped before the next
// call to continue_walk.
let (next, _) = walker.pending_links();
blocks.as_file(&next.to_bytes())?.read_to_end(&mut buf)?;
match walker.next(&buf, &mut cache)? {
ContinuedWalk::Bucket(..) => {
// Continuation of a HAMT shard directory that is usually ignored
}
ContinuedWalk::File(segment, _, path, metadata, size) => {
if segment.is_first() {
// this is set on the root block, no actual bytes are present for multiblock
// files
}
if segment.is_last() {
let mode = metadata.mode().unwrap_or(0o0644) & 0o7777;
let (seconds, _) = metadata.mtime().unwrap_or((0, 0));
println!("f {mode:o} {seconds:>12} {size:>16} {path:?}");
}
}
ContinuedWalk::Directory(_, path, metadata)
| ContinuedWalk::RootDirectory(_, path, metadata) => {
let mode = metadata.mode().unwrap_or(0o0755) & 0o7777;
let (seconds, _) = metadata.mtime().unwrap_or((0, 0));
println!("d {:o} {:>12} {:>16} {:?}", mode, seconds, "-", path);
}
ContinuedWalk::Symlink(bytes, _, path, metadata) => {
let target = Path::new(std::str::from_utf8(bytes).unwrap());
let mode = metadata.mode().unwrap_or(0o0755) & 0o7777;
let (seconds, _) = metadata.mtime().unwrap_or((0, 0));
println!(
"s {:o} {:>12} {:>16} {:?} -> {:?}",
mode, seconds, "-", path, target
);
}
};
}
Ok(())
}
enum Error {
OpeningFailed(IoError),
Other(IoError),
Walk(rust_unixfs::walk::Error),
}
impl From<IoError> for Error {
fn from(e: IoError) -> Error {
Error::Other(e)
}
}
impl From<rust_unixfs::walk::Error> for Error {
fn from(e: rust_unixfs::walk::Error) -> Error {
Error::Walk(e)
}
}
impl fmt::Display for Error {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
use Error::*;
match self {
OpeningFailed(e) => write!(fmt, "Failed to open file: {e}"),
Other(e) => write!(fmt, "A file-related IO error: {e}"),
Walk(e) => write!(fmt, "Walk failed, please report this as a bug: {e}"),
}
}
}
struct ShardedBlockStore {
root: PathBuf,
}
impl ShardedBlockStore {
fn as_path(&self, key: &[u8]) -> PathBuf {
// assume that we have a block store with second-to-last/2 sharding
// files in Base32Upper
let encoded = multibase::Base::Base32Upper.encode(key);
let len = encoded.len();
// this is safe because base32 is ascii
let dir = &encoded[(len - 3)..(len - 1)];
assert_eq!(dir.len(), 2);
let mut path = self.root.clone();
path.push(dir);
path.push(encoded);
path.set_extension("data");
path
}
fn as_file(&self, key: &[u8]) -> Result<std::fs::File, Error> {
let path = self.as_path(key);
std::fs::OpenOptions::new()
.read(true)
.open(path)
.map_err(Error::OpeningFailed)
}
}
|
