Add --profile command line option

When expanding an asset path, currently only the "target/release/" prefix
could be remapped. By comprehending the build profile, path expansion can
happen for "target/<profile>". This enables use of both alternative
target-triple and build profiles.

For example, given the following asset configuration in Cargo.toml:

    [package.metadata.generate-rpm]
    assets = [
      { source = "target/my-profile/my-exe", dest = "/usr/bin/", mode = "755" },
    ]

rpms can be generated for multiple target triples, such as:

    cargo generate-rpm --profile my-profile --target x86_64-unknown-linux-musl
    cargo generate-rpm --profile my-profile --target i668-unknown-linux-musl

with the paths for the "my-exe" executable expanded correctly to:

    target/x86_64-unknown-linux-musl/my-profile/my-exe
    target/i686-unknown-linux-musl/my-profile/my-exe

This behavior is consistent with cargo-deb, which also has a --profile
option for the same purpose.

Signed-off-by: Peter Grayson <pete@jpgrayson.net>

README.md

@@ -172,7 +172,7 @@ Because all packages in the workspace share a common output directory that is lo
 
 ### Cross compilation
 
-This command supports `--target-dir` and `--target` option like `cargo build`.
+This command supports `--target-dir`, `--target`, and `--profile` options like `cargo build`.
 Depending on these options, this command changes the RPM package file location and replaces `target/release/` of
 the source locations of the assets.
 
@@ -189,6 +189,9 @@ In this case, the source of the asset `{ source = "target/release/XXX", dest = "
 You can use `CARGO_BUILD_TARGET` environment variable instead of `--target` option and `CARGO_BUILD_TARGET_DIR` or
 `CARGO_TARGET_DIR` instead of `--target-dir`.
 
+Similarly, if using a custom build profile with, for example, `--profile custom` the source of the asset
+`{ source = "target/release/XXX" }` will be treated as `target/custom/XXX`.
+
 ### Payload compress type
 
 The default payload compress type of the generated RPM file is zstd.

src/build_target.rs

@@ -5,6 +5,7 @@ use std::path::{Path, PathBuf};
 pub struct BuildTarget {
     pub target_dir: Option<String>,
     pub target: Option<String>,
+    pub profile: Option<String>,
     pub arch: Option<String>,
 }
 

src/config/file_info.rs

@@ -108,12 +108,14 @@ impl FileInfo<'_, '_, '_, '_> {
         parent: P,
         idx: usize,
     ) -> Result<Vec<(PathBuf, String)>, ConfigError> {
+        let profile = build_target.profile.as_deref().unwrap_or("release");
         let source = self
             .source
             .strip_prefix("target/release/")
+            .or_else(|| self.source.strip_prefix(&format!("target/{profile}/")))
             .and_then(|rel_path| {
                 build_target
-                    .target_path("release")
+                    .target_path(profile)
                     .join(rel_path)
                     .to_str()
                     .map(|v| v.to_string())
@@ -411,11 +413,16 @@ mod test {
             )]
         );
 
-        std::fs::create_dir_all(tempdir.path().join("target/foobarbaz/release")).unwrap();
-        File::create(tempdir.path().join("target/foobarbaz/release/foobarbaz")).unwrap();
+        std::fs::create_dir_all(tempdir.path().join("target/target-triple/my-profile")).unwrap();
+        File::create(
+            tempdir
+                .path()
+                .join("target/target-triple/my-profile/my-bin"),
+        )
+        .unwrap();
         let file_info = FileInfo {
-            source: "target/release/foobarbaz".into(),
-            dest: "/usr/bin/foobarbaz".into(),
+            source: "target/release/my-bin".into(),
+            dest: "/usr/bin/my-bin".into(),
             user: None,
             group: None,
             mode: None,
@@ -432,7 +439,8 @@ mod test {
                     .unwrap()
                     .to_string(),
             ),
-            target: Some("foobarbaz".to_string()),
+            target: Some("target-triple".to_string()),
+            profile: Some("my-profile".to_string()),
             ..Default::default()
         };
         let expanded = file_info
@@ -447,7 +455,7 @@ mod test {
                 Some(
                     tempdir
                         .path()
-                        .join("target/foobarbaz/release/foobarbaz")
+                        .join("target/target-triple/my-profile/my-bin")
                         .to_str()
                         .unwrap()
                 ),
@@ -490,7 +498,7 @@ mod test {
                 "/usr/share/doc/cargo-generate-rpm/", // specifying directory
                 0
             )
-                .unwrap(),
+            .unwrap(),
             vec![(
                 PathBuf::from("README.md"),
                 "/usr/share/doc/cargo-generate-rpm/README.md".into()

src/main.rs

@@ -120,6 +120,12 @@ fn parse_arg() -> Result<(BuildTarget, Option<PathBuf>, Option<String>, CliSetti
     May be specified with CARGO_BUILD_TARGET_DIR or CARGO_TARGET_DIR environment variables.",
         "DIRECTORY",
     );
+    opts.optopt(
+        "",
+        "profile",
+        "Select which build profile to package. Defaults to \"release\".",
+        "PROFILE",
+    );
     opts.optopt(
         "",
         "payload-compress",
@@ -179,6 +185,9 @@ fn parse_arg() -> Result<(BuildTarget, Option<PathBuf>, Option<String>, CliSetti
     if let Some(target_dir) = opt_matches.opt_str("target-dir") {
         build_target.target_dir = Some(target_dir);
     }
+    if let Some(profile) = opt_matches.opt_str("profile") {
+        build_target.profile = Some(profile);
+    }
     let payload_compress = opt_matches
         .opt_str("payload-compress")
         .unwrap_or("zstd".to_string());