Switch from failure to anyhow

failure is abandoned upstream, see
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25575 and
https://github.com/rust-lang-deprecated/failure

Change-Id: Iaa238ba638e47b95f96eba8b36db9fe147c466c8
Reviewed-on: https://fuchsia-review.googlesource.com/c/fargo/+/874441
Reviewed-by: Adam Perry <adamperry@google.com>
diff --git a/Cargo.lock b/Cargo.lock
index aa3961d..5858c4d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,762 +1,700 @@
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-"checksum rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
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diff --git a/Cargo.toml b/Cargo.toml
index 123ec7c..3ef27ec 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,6 @@
 
 [dependencies]
 clap = "2"
-failure = "0.1.1"
 itertools = "0.7"
 uname = "0.1.1"
 notify = "4.0.0"
@@ -17,6 +16,7 @@
 structopt = "0.3"
 tempfile = "3.1"
 toml = "0.5"
+anyhow = "1.0.71"
 
 [[bin]]
 name = "fargo"
diff --git a/src/bin/fargo.rs b/src/bin/fargo.rs
index 6ab5eff..b0bdb25 100644
--- a/src/bin/fargo.rs
+++ b/src/bin/fargo.rs
@@ -1,11 +1,11 @@
 #![recursion_limit = "1024"]
 
 use fargo::command_line::run;
-use itertools::Itertools;
+use anyhow::anyhow;
 
 fn main() {
-    if let Err(ref e) = run() {
-        println!("error: {}", e.iter_chain().join(", "));
+    if let Err(e) = run() {
+        println!("error: {:#}", anyhow!(e));
         ::std::process::exit(1);
     }
 }
diff --git a/src/build_rustc.rs b/src/build_rustc.rs
index 6e463d6..dac0cfe 100644
--- a/src/build_rustc.rs
+++ b/src/build_rustc.rs
@@ -4,7 +4,7 @@
 use crate::X64;
 use crate::{get_target_triple, get_triple_cpu};
 
-use failure::Error;
+use anyhow::Error;
 use std::fs::create_dir_all;
 use std::fs::File;
 use std::io::Write;
diff --git a/src/command_line.rs b/src/command_line.rs
index 9255305..36d93e5 100644
--- a/src/command_line.rs
+++ b/src/command_line.rs
@@ -12,7 +12,7 @@
     sdk::TargetOptions,
     write_config, FuchsiaConfig, RunCargoOptions, RunMode,
 };
-use failure::{bail, Error, ResultExt};
+use anyhow::{bail, Error, Context as _};
 use std::path::PathBuf;
 use structopt::StructOpt;
 
diff --git a/src/cross.rs b/src/cross.rs
index fb0f61e..dfd506c 100644
--- a/src/cross.rs
+++ b/src/cross.rs
@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 use crate::sdk::{clang_base_path, sysroot_path, TargetOptions};
-use failure::{Error, ResultExt};
+use anyhow::{Error, Context as _};
 use std::env;
 use std::fs;
 use std::path::PathBuf;
diff --git a/src/device.rs b/src/device.rs
index 9d37b41..ea035a4 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -4,7 +4,7 @@
 
 use crate::sdk::{fuchsia_dir, fx_path, TargetOptions};
 use crate::utils::is_mac;
-use failure::{bail, err_msg, Error, ResultExt};
+use anyhow::{bail, anyhow, Error, Context as _};
 use std::env;
 use std::path::Path;
 use std::process::{Command, Stdio};
@@ -138,9 +138,9 @@
             .status()
             .map_err(|e| {
                 if e.kind() == ::std::io::ErrorKind::NotFound {
-                    err_msg(TUNCTL_NOT_FOUND_ERROR)
+                    anyhow!(TUNCTL_NOT_FOUND_ERROR)
                 } else {
-                    err_msg("tunctl failed to create a new tap network device")
+                    anyhow!("tunctl failed to create a new tap network device")
                 }
             })?;
 
diff --git a/src/lib.rs b/src/lib.rs
index 5761ac0..e4d28f2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -30,7 +30,7 @@
 };
 use manifest::Manifest;
 
-use failure::{bail, err_msg, Error, ResultExt};
+use anyhow::{anyhow, bail, Error, Context as _};
 use std::fs;
 use std::fs::File;
 use std::io::Write;
@@ -487,7 +487,7 @@
 
     let mut runner_args = vec![fargo_path
         .to_str()
-        .ok_or_else(|| err_msg("unable to convert path to utf8 encoding"))?];
+        .ok_or_else(|| anyhow!("unable to convert path to utf8 encoding"))?];
 
     if options.verbose {
         runner_args.push("-v");
diff --git a/src/linking.rs b/src/linking.rs
index 5418568..660e20e 100644
--- a/src/linking.rs
+++ b/src/linking.rs
@@ -1,4 +1,4 @@
-use failure::Error;
+use anyhow::Error;
 use regex::Regex;
 use std::{collections::BTreeSet, io};
 
diff --git a/src/manifest.rs b/src/manifest.rs
index 9b87344..d146a60 100644
--- a/src/manifest.rs
+++ b/src/manifest.rs
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-use failure::{Error, ResultExt};
+use anyhow::{Error, Context as _};
 use serde_derive::Deserialize;
 use std::{fs, path::PathBuf};
 
diff --git a/src/package.rs b/src/package.rs
index dccb50b..869a9f6 100644
--- a/src/package.rs
+++ b/src/package.rs
@@ -11,7 +11,7 @@
     utils::{strip_binary, target_crate_path},
     RunCargoOptions,
 };
-use failure::{bail, ensure, format_err, Error, ResultExt};
+use anyhow::{bail, ensure, format_err, Error, Context as _};
 use serde::{Deserialize, Serialize};
 use serde_json::json;
 use std::{
diff --git a/src/sdk.rs b/src/sdk.rs
index 39d563d..c99b089 100644
--- a/src/sdk.rs
+++ b/src/sdk.rs
@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 use crate::{get_triple_cpu, utils::is_mac, X64};
-use failure::{bail, Error, ResultExt};
+use anyhow::{bail, Error, Context as _};
 use std::path::PathBuf;
 use std::process::Command;
 use std::{env, str};
diff --git a/src/utils.rs b/src/utils.rs
index a68094e..52b3270 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 use crate::sdk::strip_tool_path;
-use failure::{bail, format_err, Error, ResultExt};
+use anyhow::{bail, format_err, Error, Context as _};
 use std::path::{Path, PathBuf};
 use std::process::Command;
 use std::time::Duration;