Add a prerequisites check

Cargo.lock

@@ -61,7 +61,7 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e28923312444cdd728e4738b3f9c9cac739500909bb3d3c94b43551b16517648"
 dependencies = [
- "windows-sys",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -71,7 +71,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1cd54b81ec8d6180e24654d0b371ad22fc3dd083b6ff8ba325b72e00c87660a7"
 dependencies = [
  "anstyle",
- "windows-sys",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -341,7 +341,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a258e46cdc063eb8519c00b9fc845fc47bcfca4130e2f08e88665ceda8474245"
 dependencies = [
  "libc",
- "windows-sys",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -405,6 +405,7 @@ dependencies = [
  "serde_yaml",
  "tempfile",
  "time",
+ "which",
 ]
 
 [[package]]
@@ -413,6 +414,15 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d77f7ec81a6d05a3abb01ab6eb7590f6083d08449fe5a1c8b1e620283546ccb7"
 
+[[package]]
+name = "home"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d1354bf6b7235cb4a0576c2619fd4ed18183f689b12b006a0ee7329eeff9a5"
+dependencies = [
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "humantime"
 version = "2.1.0"
@@ -460,7 +470,7 @@ checksum = "0bad00257d07be169d870ab665980b06cdb366d792ad690bf2e76876dc503455"
 dependencies = [
  "hermit-abi",
  "rustix",
- "windows-sys",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -664,7 +674,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -779,7 +789,7 @@ dependencies = [
  "fastrand",
  "redox_syscall",
  "rustix",
- "windows-sys",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -940,6 +950,19 @@ version = "0.2.89"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ab9b36309365056cd639da3134bf87fa8f3d86008abf99e612384a6eecd459f"
 
+[[package]]
+name = "which"
+version = "5.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9bf3ea8596f3a0dd5980b46430f2058dfe2c36a27ccfbb1845d6fbfcd9ba6e14"
+dependencies = [
+ "either",
+ "home",
+ "once_cell",
+ "rustix",
+ "windows-sys 0.48.0",
+]
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -980,6 +1003,15 @@ dependencies = [
  "windows-targets 0.52.0",
 ]
 
+[[package]]
+name = "windows-sys"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+dependencies = [
+ "windows-targets 0.48.5",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"

Cargo.toml

@@ -21,3 +21,4 @@ serde_json = "1.0.110"
 serde_yaml = "0.9.29"
 tempfile = "3.9.0"
 time = { version = "0.3.31", features = ["serde", "formatting", "parsing"]}
+which = "5.0.0"

src/config/mod.rs

@@ -189,11 +189,9 @@ impl Chart {
                     return Err(Box::from("unknown repository kind is found"));
                 }
             }
-            None => {
-                Err(Box::from(
-                    "repository object is not filled up for the chart",
-                ))
-            }
+            None => Err(Box::from(
+                "repository object is not filled up for the chart",
+            )),
         }
     }
 }

src/main.rs

@@ -8,7 +8,7 @@ pub(crate) mod template;
 use clap::Parser;
 use log::{error, info};
 use std::collections::HashMap;
-use std::fs;
+use std::{env, fs};
 use std::{fs::create_dir, path::PathBuf, process::exit};
 use tempfile::TempDir;
 
@@ -27,6 +27,8 @@ struct Args {
     /// Dry run
     #[arg(short, long, default_value = "false")]
     dry_run: bool,
+    #[arg(long, default_value = "false")]
+    skip_prerequisites_check: bool,
     /// Init git patch. Use it if you want to create git patch for a chart
     /// It's going to pull a chart and init a git repo there, so you can
     /// apply changes and create a patch file
@@ -36,9 +38,30 @@ struct Args {
     init_git_patch: Option<Vec<String>>,
 }
 
+fn check_prerequisites() -> Result<(), Box<dyn std::error::Error>> {
+    info!("checking prerequisites");
+    let prerequisites = vec!["helm", "yq", "helm"];
+    for bin in prerequisites {
+        info!("checking {}", bin);
+        which::which(bin)?;
+    }
+    Ok(())
+}
+
 fn main() {
+    // Prepare the logger
+    if env::var("RUST_LOG").is_err() {
+        env::set_var("RUST_LOG", "info")
+    }
     env_logger::init();
+
     let args = Args::parse();
+    if !args.skip_prerequisites_check {
+        if let Err(err) = check_prerequisites() {
+            error!("{}", err);
+            exit(1);
+        }
+    }
     // Prepare the workdir
     let workdir_path = match args.workdir {
         Some(res) => match create_dir(res.clone()) {

src/source/mod.rs

@@ -36,18 +36,16 @@ pub(crate) struct Version {
 
 pub(crate) fn repo_from_chart(chart: Chart) -> Result<Box<dyn Repo>, Box<dyn std::error::Error>> {
     match chart.get_repo_kind() {
-        Ok(res) => {
-            match res {
-                crate::config::RepositoryKind::Helm => {
-                    let helm: helm::Helm = chart.into();
-                    Ok(Box::new(helm))
-                }
-                crate::config::RepositoryKind::Git => {
-                    let git: git::Git = chart.into();
-                    Ok(Box::new(git))
-                }
+        Ok(res) => match res {
+            crate::config::RepositoryKind::Helm => {
+                let helm: helm::Helm = chart.into();
+                Ok(Box::new(helm))
             }
-        }
+            crate::config::RepositoryKind::Git => {
+                let git: git::Git = chart.into();
+                Ok(Box::new(git))
+            }
+        },
         Err(err) => Err(err),
     }
 }