From 882ff473d5f45dff2d537daf9cdf05ea96db96ed Mon Sep 17 00:00:00 2001
From: gibix <gibix@riseup.net>
Date: Mon, 19 Mar 2018 18:43:02 +0100
Subject: [PATCH] fix #2773 with new precise encode

---
 src/cargo/ops/cargo_generate_lockfile.rs |  2 +-
 src/cargo/sources/registry/index.rs      | 13 +++++++++----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/src/cargo/ops/cargo_generate_lockfile.rs b/src/cargo/ops/cargo_generate_lockfile.rs
index c9a61266a..741974e3b 100644
--- a/src/cargo/ops/cargo_generate_lockfile.rs
+++ b/src/cargo/ops/cargo_generate_lockfile.rs
@@ -69,7 +69,7 @@ pub fn update_lockfile(ws: &Workspace, opts: &UpdateOptions) -> CargoResult<()>
                         //       seems like a pretty hokey reason to single out
                         //       the registry as well.
                         let precise = if dep.source_id().is_registry() {
-                            format!("{}={}", dep.name(), precise)
+                            format!("{}={}->{}", dep.name(), dep.version(), precise)
                         } else {
                             precise.to_string()
                         };
diff --git a/src/cargo/sources/registry/index.rs b/src/cargo/sources/registry/index.rs
index eb07c24e8..b47ac26ce 100644
--- a/src/cargo/sources/registry/index.rs
+++ b/src/cargo/sources/registry/index.rs
@@ -179,13 +179,18 @@ impl<'cfg> RegistryIndex<'cfg> {
             .map(|s| s.0.clone());
 
         // Handle `cargo update --precise` here. If specified, our own source
-        // will have a precise version listed of the form `<pkg>=<req>` where
-        // `<pkg>` is the name of a crate on this source and `<req>` is the
+        // will have a precise version listed of the form
+        // `<pkg>=<p_req>o-><f_req>` where `<pkg>` is the name of a crate on
+        // this source, `<p_req>` is the version installed and `<f_req> is the
         // version requested (argument to `--precise`).
         let summaries = summaries.filter(|s| match source_id.precise() {
             Some(p) if p.starts_with(&*dep.name()) && p[dep.name().len()..].starts_with('=') => {
-                let vers = &p[dep.name().len() + 1..];
-                s.version().to_string() == vers
+                let vers: Vec<&str> = p[dep.name().len() + 1..].split("->").collect();
+                    if dep.version_req().matches(&Version::parse(vers[0]).unwrap()) {
+                        return vers[1] == s.version().to_string()
+                    }
+
+                    true
             }
             _ => true,
         });
-- 
2.30.2