rustpkg: Make crates, not packages, the unit of rustpkg dependencies

Treating a package as the thing that can have other packages depend on it,
and depends on other packages, was wrong if a package has more than one
crate. Now, rustpkg knows about dependencies between crates in the same
package. This solves the problem reported in #7879 where rustpkg wrongly
discovered a circular dependency between thhe package and itself, and
recursed infinitely.

Closes #7879

src/librustpkg/api.rs

@@ -12,6 +12,7 @@ use context::*;
 use crate::*;
 use package_id::*;
 use package_source::*;
+use target::*;
 use version::Version;
 use workcache_support::*;
 
@@ -63,56 +64,40 @@ pub fn new_workcache_context(p: &Path) -> workcache::Context {
 pub fn build_lib(sysroot: Path, root: Path, name: ~str, version: Version,
                  lib: Path) {
     let cx = default_context(sysroot);
-    let subroot = root.clone();
-    let subversion = version.clone();
-    let sublib = lib.clone();
-    do cx.workcache_context.with_prep(name) |prep| {
-        let pkg_src = PkgSrc {
-            workspace: subroot.clone(),
-            start_dir: subroot.push("src").push(name),
-            id: PkgId{ version: subversion.clone(), ..PkgId::new(name)},
-            libs: ~[mk_crate(sublib.clone())],
+    let pkg_src = PkgSrc {
+            workspace: root.clone(),
+            start_dir: root.push("src").push(name),
+            id: PkgId{ version: version, ..PkgId::new(name)},
+            // n.b. This assumes the package only has one crate
+            libs: ~[mk_crate(lib)],
             mains: ~[],
             tests: ~[],
             benchs: ~[]
         };
-        pkg_src.declare_inputs(prep);
-        let subcx = cx.clone();
-        let subsrc = pkg_src.clone();
-        do prep.exec |exec| {
-            subsrc.build(exec, &subcx.clone(), ~[]);
-        }
-    };
+    pkg_src.build(&cx, ~[]);
 }
 
 pub fn build_exe(sysroot: Path, root: Path, name: ~str, version: Version,
                  main: Path) {
     let cx = default_context(sysroot);
-    let subroot = root.clone();
-    let submain = main.clone();
-    do cx.workcache_context.with_prep(name) |prep| {
-        let pkg_src = PkgSrc {
-            workspace: subroot.clone(),
-            start_dir: subroot.push("src").push(name),
-            id: PkgId{ version: version.clone(), ..PkgId::new(name)},
-            libs: ~[],
-            mains: ~[mk_crate(submain.clone())],
-            tests: ~[],
-            benchs: ~[]
-        };
-        pkg_src.declare_inputs(prep);
-        let subsrc = pkg_src.clone();
-        let subcx = cx.clone();
-        do prep.exec |exec| {
-            subsrc.clone().build(exec, &subcx.clone(), ~[]);
-        }
-    }
+    let pkg_src = PkgSrc {
+        workspace: root.clone(),
+        start_dir: root.push("src").push(name),
+        id: PkgId{ version: version, ..PkgId::new(name)},
+        libs: ~[],
+        // n.b. This assumes the package only has one crate
+        mains: ~[mk_crate(main)],
+        tests: ~[],
+        benchs: ~[]
+    };
+
+    pkg_src.build(&cx, ~[]);
 }
 
 pub fn install_pkg(sysroot: Path, workspace: Path, name: ~str, version: Version) {
     let cx = default_context(sysroot);
     let pkgid = PkgId{ version: version, ..PkgId::new(name)};
-    cx.install(PkgSrc::new(workspace, false, pkgid));
+    cx.install(PkgSrc::new(workspace, false, pkgid), &Everything);
 }
 
 fn mk_crate(p: Path) -> Crate {

src/librustpkg/exit_codes.rs

@@ -0,0 +1,11 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+pub static copy_failed_code: int = 65;

src/librustpkg/package_id.rs

@@ -108,6 +108,12 @@ impl PkgId {
         }
     }
 
+    // This is the workcache function name for the *installed*
+    // binaries for this package (as opposed to the built ones,
+    // which are per-crate).
+    pub fn install_tag(&self) -> ~str {
+        fmt!("install(%s)", self.to_str())
+    }
 }
 
 struct Prefixes {

src/librustpkg/package_source.rs

@@ -22,6 +22,7 @@ use path_util::{find_dir_using_rust_path_hack, default_workspace, make_dir_rwx_r
 use util::compile_crate;
 use workspace::is_workspace;
 use workcache_support;
+use workcache_support::crate_tag;
 use extra::workcache;
 
 // An enumeration of the unpacked source of a package workspace.
@@ -231,7 +232,7 @@ impl PkgSrc {
         p.filestem().map_default(false, |p| { p == &self.id.short_name.as_slice() })
     }
 
-    fn push_crate(cs: &mut ~[Crate], prefix: uint, p: &Path) {
+    pub fn push_crate(cs: &mut ~[Crate], prefix: uint, p: &Path) {
         assert!(p.components.len() > prefix);
         let mut sub = Path("");
         for c in p.components.slice(prefix, p.components.len()).iter() {
@@ -286,7 +287,6 @@ impl PkgSrc {
 
     fn build_crates(&self,
                     ctx: &BuildContext,
-                    exec: &mut workcache::Exec,
                     destination_dir: &Path,
                     crates: &[Crate],
                     cfgs: &[~str],
@@ -297,25 +297,40 @@ impl PkgSrc {
             let path_str = path.to_str();
             let cfgs = crate.cfgs + cfgs;
 
-            let result =
-                // compile_crate should return the path of the output artifact
-                compile_crate(ctx,
-                              exec,
-                              &self.id,
-                              &path,
-                              destination_dir,
-                              crate.flags,
-                              cfgs,
-                              false,
-                              what).to_str();
-            debug!("Result of compiling %s was %s", path_str, result);
+            do ctx.workcache_context.with_prep(crate_tag(&path)) |prep| {
+                debug!("Building crate %s, declaring it as an input", path.to_str());
+                prep.declare_input("file", path.to_str(),
+                                   workcache_support::digest_file_with_date(&path));
+                let subpath = path.clone();
+                let subcfgs = cfgs.clone();
+                let subpath_str = path_str.clone();
+                let subcx = ctx.clone();
+                let id = self.id.clone();
+                let sub_dir = destination_dir.clone();
+                let sub_flags = crate.flags.clone();
+                do prep.exec |exec| {
+                    let result = compile_crate(&subcx,
+                                               exec,
+                                               &id,
+                                               &subpath,
+                                               &sub_dir,
+                                               sub_flags,
+                                               subcfgs,
+                                               false,
+                                               what).to_str();
+                    debug!("Result of compiling %s was %s", subpath_str, result);
+                    result
+                }
+            };
         }
     }
 
     /// Declare all the crate files in the package source as inputs
+    /// (to the package)
     pub fn declare_inputs(&self, prep: &mut workcache::Prep) {
         let to_do = ~[self.libs.clone(), self.mains.clone(),
                       self.tests.clone(), self.benchs.clone()];
+        debug!("In declare inputs, self = %s", self.to_str());
         for cs in to_do.iter() {
             for c in cs.iter() {
                 let path = self.start_dir.push_rel(&c.file).normalize();
@@ -330,7 +345,6 @@ impl PkgSrc {
     // It would be better if build returned a Path, but then Path would have to derive
     // Encodable.
     pub fn build(&self,
-                 exec: &mut workcache::Exec,
                  build_context: &BuildContext,
                  cfgs: ~[~str]) -> ~str {
         use conditions::not_a_workspace::cond;
@@ -360,13 +374,23 @@ impl PkgSrc {
         let benchs = self.benchs.clone();
         debug!("Building libs in %s, destination = %s",
                destination_workspace.to_str(), destination_workspace.to_str());
-        self.build_crates(build_context, exec, &destination_workspace, libs, cfgs, Lib);
+        self.build_crates(build_context, &destination_workspace, libs, cfgs, Lib);
         debug!("Building mains");
-        self.build_crates(build_context, exec, &destination_workspace, mains, cfgs, Main);
+        self.build_crates(build_context, &destination_workspace, mains, cfgs, Main);
         debug!("Building tests");
-        self.build_crates(build_context, exec, &destination_workspace, tests, cfgs, Test);
+        self.build_crates(build_context, &destination_workspace, tests, cfgs, Test);
         debug!("Building benches");
-        self.build_crates(build_context, exec, &destination_workspace, benchs, cfgs, Bench);
+        self.build_crates(build_context, &destination_workspace, benchs, cfgs, Bench);
         destination_workspace.to_str()
     }
+
+    /// Debugging
+    pub fn dump_crates(&self) {
+        let crate_sets = [&self.libs, &self.mains, &self.tests, &self.benchs];
+        for crate_set in crate_sets.iter() {
+            for c in crate_set.iter() {
+                debug!("Built crate: %s", c.file.to_str())
+            }
+        }
+    }
 }