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diff --git a/vendor/git2/examples/fetch.rs b/vendor/git2/examples/fetch.rs
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+/*
+ * libgit2 "fetch" example - shows how to fetch remote data
+ *
+ * Written by the libgit2 contributors
+ *
+ * To the extent possible under law, the author(s) have dedicated all copyright
+ * and related and neighboring rights to this software to the public domain
+ * worldwide. This software is distributed without any warranty.
+ *
+ * You should have received a copy of the CC0 Public Domain Dedication along
+ * with this software. If not, see
+ * <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+#![deny(warnings)]
+
+use git2::{AutotagOption, FetchOptions, RemoteCallbacks, Repository};
+use std::io::{self, Write};
+use std::str;
+use structopt::StructOpt;
+
+#[derive(StructOpt)]
+struct Args {
+    #[structopt(name = "remote")]
+    arg_remote: Option<String>,
+}
+
+fn run(args: &Args) -> Result<(), git2::Error> {
+    let repo = Repository::open(".")?;
+    let remote = args.arg_remote.as_ref().map(|s| &s[..]).unwrap_or("origin");
+
+    // Figure out whether it's a named remote or a URL
+    println!("Fetching {} for repo", remote);
+    let mut cb = RemoteCallbacks::new();
+    let mut remote = repo
+        .find_remote(remote)
+        .or_else(|_| repo.remote_anonymous(remote))?;
+    cb.sideband_progress(|data| {
+        print!("remote: {}", str::from_utf8(data).unwrap());
+        io::stdout().flush().unwrap();
+        true
+    });
+
+    // This callback gets called for each remote-tracking branch that gets
+    // updated. The message we output depends on whether it's a new one or an
+    // update.
+    cb.update_tips(|refname, a, b| {
+        if a.is_zero() {
+            println!("[new]     {:20} {}", b, refname);
+        } else {
+            println!("[updated] {:10}..{:10} {}", a, b, refname);
+        }
+        true
+    });
+
+    // Here we show processed and total objects in the pack and the amount of
+    // received data. Most frontends will probably want to show a percentage and
+    // the download rate.
+    cb.transfer_progress(|stats| {
+        if stats.received_objects() == stats.total_objects() {
+            print!(
+                "Resolving deltas {}/{}\r",
+                stats.indexed_deltas(),
+                stats.total_deltas()
+            );
+        } else if stats.total_objects() > 0 {
+            print!(
+                "Received {}/{} objects ({}) in {} bytes\r",
+                stats.received_objects(),
+                stats.total_objects(),
+                stats.indexed_objects(),
+                stats.received_bytes()
+            );
+        }
+        io::stdout().flush().unwrap();
+        true
+    });
+
+    // Download the packfile and index it. This function updates the amount of
+    // received data and the indexer stats which lets you inform the user about
+    // progress.
+    let mut fo = FetchOptions::new();
+    fo.remote_callbacks(cb);
+    remote.download(&[] as &[&str], Some(&mut fo))?;
+
+    {
+        // If there are local objects (we got a thin pack), then tell the user
+        // how many objects we saved from having to cross the network.
+        let stats = remote.stats();
+        if stats.local_objects() > 0 {
+            println!(
+                "\rReceived {}/{} objects in {} bytes (used {} local \
+                 objects)",
+                stats.indexed_objects(),
+                stats.total_objects(),
+                stats.received_bytes(),
+                stats.local_objects()
+            );
+        } else {
+            println!(
+                "\rReceived {}/{} objects in {} bytes",
+                stats.indexed_objects(),
+                stats.total_objects(),
+                stats.received_bytes()
+            );
+        }
+    }
+
+    // Disconnect the underlying connection to prevent from idling.
+    remote.disconnect()?;
+
+    // Update the references in the remote's namespace to point to the right
+    // commits. This may be needed even if there was no packfile to download,
+    // which can happen e.g. when the branches have been changed but all the
+    // needed objects are available locally.
+    remote.update_tips(None, true, AutotagOption::Unspecified, None)?;
+
+    Ok(())
+}
+
+fn main() {
+    let args = Args::from_args();
+    match run(&args) {
+        Ok(()) => {}
+        Err(e) => println!("error: {}", e),
+    }
+}