Remove the unused `published` field from GenericRouterStatus.

This field isn't used in modern Tor, and has never been used in
Arti.  If tor!489 is merged, then it will no longer contain a useful
value in future consensuses.  We shouldn't store it, or else
somebody else will get the smart idea of using it for something.

This commit breaks API compatibility for tor-netdoc with the
`build_docs` feature enabled.  I haven't entered that into the
semver_status.md file, since we already have a pending tor-netdoc
API breaker in !129.

crates/tor-netdoc/src/doc/netstatus/build.rs

@@ -432,7 +432,6 @@ mod test {
             .rs()
             .nickname("Fred".into())
             .identity([155; 20].into())
-            .published(now - one_hour * 6)
             .add_or_port(SocketAddr::from(([10, 0, 0, 60], 9100)))
             .add_or_port("[f00f::1]:9200".parse().unwrap())
             .dir_port(66)

crates/tor-netdoc/src/doc/netstatus/rs.rs

@@ -63,13 +63,6 @@ struct GenericRouterStatus<D> {
     nickname: String,
     /// Fingerprint of the old-style RSA identity for this relay.
     identity: RsaIdentity,
-    /// Declared time at which the router descriptor for this relay
-    /// was published.
-    ///
-    /// This value should be ignored for all purposes; see
-    /// [proposal 275](https://gitlab.torproject.org/tpo/core/torspec/-/blob/master/proposals/275-md-published-time-is-silly.txt).
-    #[allow(dead_code)] // TODO: remove this some day?
-    published: time::SystemTime,
     /// A list of address:port values where this relay can be reached.
     addrs: Vec<net::SocketAddr>,
     /// Declared OR port for this relay.
@@ -266,7 +259,9 @@ where
         let identity = RsaIdentity::from_bytes(ident.as_bytes())
             .ok_or_else(|| Error::BadArgument(r_item.pos(), "Wrong identity length".to_string()))?;
         let skip = if microdesc_format { 0 } else { 1 };
-        let published: time::SystemTime = {
+        // We check that the published time is well-formed, but we never use it
+        // for anything in a consensus document.
+        let _ignore_published: time::SystemTime = {
             // TODO: It's annoying to have to do this allocation, since we
             // already have a slice that contains both of these arguments.
             // Instead, we could get a slice of arguments: we'd have to add
@@ -326,7 +321,6 @@ where
         Ok(GenericRouterStatus {
             nickname,
             identity,
-            published,
             addrs,
             or_port,
             dir_port,

crates/tor-netdoc/src/doc/netstatus/rs/build.rs

@@ -9,7 +9,6 @@ use tor_llcrypto::pk::rsa::RsaIdentity;
 use tor_protover::Protocols;
 
 use std::net::SocketAddr;
-use std::time::SystemTime;
 
 /// A Builder object for creating a RouterStatus and adding it to a
 /// consensus.
@@ -19,8 +18,6 @@ pub struct RouterStatusBuilder<D> {
     nickname: Option<String>,
     /// See [`GenericRouterStatus::identity`].
     identity: Option<RsaIdentity>,
-    /// See [`GenericRouterStatus::published`].
-    published: Option<SystemTime>,
     /// See [`GenericRouterStatus::addrs`].
     addrs: Vec<SocketAddr>,
     /// See [`GenericRouterStatus::dir_port`].
@@ -43,7 +40,6 @@ impl<D: Clone> RouterStatusBuilder<D> {
         RouterStatusBuilder {
             nickname: None,
             identity: None,
-            published: None,
             addrs: Vec::new(),
             dir_port: 0,
             doc_digest: None,
@@ -71,13 +67,6 @@ impl<D: Clone> RouterStatusBuilder<D> {
         self.identity = Some(identity);
         self
     }
-    /// Set the publication time for this routerstatus.
-    ///
-    /// This value is optional, and does nothing (TODO).
-    pub fn published(&mut self, published: SystemTime) -> &mut Self {
-        self.published = Some(published);
-        self
-    }
     /// Add an OrPort at `addr` to this routerstatus.
     ///
     /// At least one value here is required.
@@ -138,7 +127,6 @@ impl<D: Clone> RouterStatusBuilder<D> {
         let identity = self
             .identity
             .ok_or(Error::CannotBuild("Missing RSA identity"))?;
-        let published = self.published.unwrap_or_else(SystemTime::now);
         if self.addrs.is_empty() {
             return Err(Error::CannotBuild("No addresses"));
         }
@@ -158,7 +146,6 @@ impl<D: Clone> RouterStatusBuilder<D> {
         Ok(GenericRouterStatus {
             nickname,
             identity,
-            published,
             addrs: self.addrs.clone(),
             or_port,
             dir_port: self.dir_port,