1 files changed, 82 insertions, 0 deletions
diff --git a/internal/importer/channel.go b/internal/importer/channel.go
new file mode 100644
index 0000000..4d051cc
--- /dev/null
+++ b/internal/importer/channel.go
@@ -0,0 +1,82 @@
+package importer
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"os"
+	"os/exec"
+	"path"
+	"searchix/internal/file"
+	"searchix/internal/search"
+	"strconv"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+type ChannelImporter struct {
+	DataPath   string
+	Source     Source
+	SourceFile string
+	Logger     *slog.Logger
+	indexPath  string
+}
+
+func (i *ChannelImporter) FetchIfNeeded(parent context.Context) (bool, error) {
+	ctx, cancel := context.WithTimeout(parent, i.Source.FetchTimeout)
+	defer cancel()
+
+	dest := i.DataPath
+
+	before, err := os.Readlink(dest)
+	if file.NeedNotExist(err) != nil {
+		return false, errors.WithMessagef(err, "could not call readlink on file %s", dest)
+	}
+	i.Logger.Debug("stat before", "name", before)
+
+	args := []string{
+		"--no-build-output",
+		"--timeout",
+		strconv.Itoa(int(i.Source.FetchTimeout.Seconds() - 1)),
+		fmt.Sprintf("<%s/%s>", i.Source.Channel, i.Source.ImportPath),
+		"--attr",
+		i.Source.Attribute,
+		"--out-link",
+		dest,
+	}
+
+	i.Logger.Debug("nix-build command", "args", args)
+	cmd := exec.CommandContext(ctx, "nix-build", args...)
+	out, err := cmd.Output()
+	if err != nil {
+		return false, errors.WithMessage(err, "failed to run nix-build (--dry-run)")
+	}
+	i.Logger.Debug("nix-build", "output", strings.TrimSpace(string(out)))
+
+	outPath := path.Join(dest, i.Source.OutputPath)
+	i.Logger.Debug("checking output path", "outputPath", outPath, "dest", dest, "source", i.Source.OutputPath)
+	after, err := os.Readlink(dest)
+	if err := file.NeedNotExist(err); err != nil {
+		return false, errors.WithMessagef(err, "failed to stat output file from nix-build, filename: %s", outPath)
+	}
+	i.Logger.Debug("stat after", "name", after)
+
+	return before != after, nil
+}
+
+func (i *ChannelImporter) Import(parent context.Context, indexer *search.WriteIndex) (bool, error) {
+	if i.Source.OutputPath == "" {
+		return false, errors.New("no output path specified")
+	}
+
+	filename := path.Join(i.DataPath, i.SourceFile, i.Source.OutputPath)
+	i.Logger.Debug("preparing import run", "revision", i.Source.Repo.Revision, "filename", filename)
+
+	return processOptions(parent, indexer, &importConfig{
+		IndexPath: i.indexPath,
+		Source:    i.Source,
+		Filename:  filename,
+		Logger:    i.Logger,
+	})
+}