Flag to disable updating the lockfile

src/config.rs

@@ -66,12 +66,18 @@ fn build_cli_parser<'a, 'b>() -> App<'a, 'b> {
                 .long("git-tag")
                 .help("Optional commit the updated version and create a git tag."),
         )
+        .arg(
+            Arg::with_name("ignore-lockfile")
+                .long("ignore-lockfile")
+                .help("Don't update the lockfile")
+        )
 }
 
 pub struct Config {
     pub version_modifier: VersionModifier,
     pub manifest: PathBuf,
     pub git_tag: bool,
+    pub ignore_lockfile: bool,
 }
 
 impl Config {
@@ -81,6 +87,7 @@ impl Config {
         let build_metadata = matches.value_of("build-metadata").map(parse_identifiers);
         let pre_release = matches.value_of("pre-release").map(parse_identifiers);
         let git_tag = matches.is_present("git-tag");
+        let ignore_lockfile = matches.is_present("ignore-lockfile");
         let mut metadata_cmd = MetadataCommand::new();
         if let Some(path) = matches.value_of("manifest-path") {
             metadata_cmd.manifest_path(path);
@@ -97,6 +104,7 @@ impl Config {
                     .manifest_path
                     .clone(),
                 git_tag,
+                ignore_lockfile,
             }
         } else {
             panic!("Workspaces are not supported yet.");

src/main.rs

@@ -36,10 +36,12 @@ fn main() {
         .unwrap();
     f.write_all(output.to_string().as_bytes()).unwrap();
 
-    Command::new("cargo")
-    .args(&["generate-lockfile", "--offline", "--manifest-path", &conf.manifest.to_string_lossy()])
-    .status()
-    .expect("Failed to generate lockfile");
+    if !&conf.ignore_lockfile {
+        Command::new("cargo")
+        .args(&["generate-lockfile", "--offline", "--manifest-path", &conf.manifest.to_string_lossy()])
+        .status()
+        .expect("Failed to generate lockfile");
+    }
 
     if use_git {
         git::git_commit_and_tag(version);