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// Copyright 2017 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package build
import (
"bufio"
"path/filepath"
"strings"
)
// Checks for files in the out directory that have a rule that depends on them but no rule to
// create them. This catches a common set of build failures where a rule to generate a file is
// deleted (either by deleting a module in an Android.mk file, or by modifying the build system
// incorrectly). These failures are often not caught by a local incremental build because the
// previously built files are still present in the output directory.
func testForDanglingRules(ctx Context, config Config) {
ctx.BeginTrace("test for dangling rules")
defer ctx.EndTrace()
// Get a list of leaf nodes in the dependency graph from ninja
executable := config.PrebuiltBuildTool("ninja")
args := []string{}
args = append(args, config.NinjaArgs()...)
args = append(args, "-f", config.CombinedNinjaFile())
args = append(args, "-t", "targets", "rule")
cmd := Command(ctx, config, "ninja", executable, args...)
stdout, err := cmd.StdoutPipe()
if err != nil {
ctx.Fatal(err)
}
cmd.StartOrFatal()
outDir := config.OutDir()
bootstrapDir := filepath.Join(outDir, "soong", ".bootstrap")
miniBootstrapDir := filepath.Join(outDir, "soong", ".minibootstrap")
var danglingRules []string
scanner := bufio.NewScanner(stdout)
for scanner.Scan() {
line := scanner.Text()
if !strings.HasPrefix(line, outDir) {
// Leaf node is not in the out directory.
continue
}
if strings.HasPrefix(line, bootstrapDir) || strings.HasPrefix(line, miniBootstrapDir) {
// Leaf node is in one of Soong's bootstrap directories, which do not have
// full build rules in the primary build.ninja file.
continue
}
danglingRules = append(danglingRules, line)
}
cmd.WaitOrFatal()
if len(danglingRules) > 0 {
ctx.Println("Dependencies in out found with no rule to create them:")
for _, dep := range danglingRules {
ctx.Println(dep)
}
ctx.Fatal("")
}
}
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