goto: swap redacted content for human readable message

Summary:
When checking out files, if the content matches the redacted tombstone, swap the contents to a human readable message. This logic was missing from the Rust checkout.

I considered adding this logic deeper in the scmstore FileStore object, but I didn't like that since it would make it hard for us to see the "real" content served by the server. Only performing the substitution for the working copy manifestation of the contents seems better.

Reviewed By: quark-zju, andreacampi

Differential Revision: D67958797

fbshipit-source-id: 73d6cddcee53530e562b5df543584a4f0f85fab0

eden/mononoke/tests/integration/test-redaction-config.t

@@ -144,9 +144,8 @@ Restart mononoke
   $ hg up -q 14961831bd3a
 
 Should gives us the tombstone file since it is redacted
-FIXME: should show message for human
   $ cat b
-  PoUOK1GkdH6Xtx5j9WKYew3dZXspyfkahcNkhV6MJ4rhyNICTvX0nxmbCImFoT0oHAF9ivWGaC6ByswQZUgf1nlyxcDcahHknJS15Vl9Lvc4NokYhMg0mV1rapq1a4bhNoUI9EWTBiAkYmkadkO3YQXV0TAjyhUQWxxLVskjOwiiFPdL1l1pdYYCLTE3CpgOoxQV3EPVxGUPh1FGfk7F9Myv22qN1sUPSNN4h3IFfm2NNPRFgWPDsqAcaQ7BUSKa
+  This version of the file is redacted and you are not allowed to access it. Update or rebase to a newer commit.
 
 
 Mononoke admin also won't give us the content

eden/scm/lib/checkout/Cargo.toml

@@ -17,6 +17,7 @@ anyhow = "1.0.95"
 crossbeam = "0.8"
 fail = { version = "0.4", features = ["failpoints"] }
 parking_lot = { version = "0.12.1", features = ["send_guard"] }
+redacted = { version = "0.1.0", path = "../util/redacted" }
 sapling-async-runtime = { version = "0.1.0", path = "../async-runtime" }
 sapling-atexit = { version = "0.1.0", path = "../util/atexit" }
 sapling-configmodel = { version = "0.1.0", path = "../config/model" }

eden/scm/lib/checkout/src/lib.rs

@@ -43,6 +43,7 @@ use pathmatcher::Matcher;
 use pathmatcher::UnionMatcher;
 use progress_model::ProgressBar;
 use progress_model::Registry;
+use redacted::redact_if_needed;
 use repo::repo::Repo;
 use serde::Deserialize;
 use storemodel::FileStore;
@@ -355,6 +356,9 @@ impl CheckoutPlan {
                     }
                     Ok(v) => v,
                 };
+
+                let data = redact_if_needed(data);
+
                 let action = actions
                     .get(&key)
                     .ok_or_else(|| format_err!("Storage returned unknown key {}", key))?;