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package fetcher
import (
"context"
"fmt"
"log/slog"
"os"
"os/exec"
"path"
"searchix/internal/config"
"searchix/internal/file"
"strconv"
"strings"
"github.com/pkg/errors"
)
type ChannelFetcher struct {
DataPath string
Source *config.Source
SourceFile string
Logger *slog.Logger
}
func NewChannelFetcher(
source *config.Source,
dataPath string,
logger *slog.Logger,
) (*ChannelFetcher, error) {
switch source.Importer {
case config.Options:
return &ChannelFetcher{
DataPath: dataPath,
Source: source,
Logger: logger,
}, nil
default:
return nil, fmt.Errorf("unsupported importer type %s", source.Importer)
}
}
func (i *ChannelFetcher) FetchIfNeeded(
parent context.Context,
) (f FetchedFiles, updated bool, err error) {
ctx, cancel := context.WithTimeout(parent, i.Source.FetchTimeout.Duration)
defer cancel()
dest := i.DataPath
var before string
before, err = os.Readlink(dest)
if file.NeedNotExist(err) != nil {
err = errors.WithMessagef(err, "could not call readlink on file %s", dest)
return
}
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,
}
if i.Source.URL != "" {
args = append(args, "-I", fmt.Sprintf("%s=%s", i.Source.Channel, i.Source.URL))
}
i.Logger.Debug("nix-build command", "args", args)
cmd := exec.CommandContext(ctx, "nix-build", args...)
var out []byte
out, err = cmd.Output()
if err != nil {
err = errors.WithMessage(err, "failed to run nix-build (--dry-run)")
return
}
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,
)
var after string
after, err = os.Readlink(dest)
if err = file.NeedNotExist(err); err != nil {
err = errors.WithMessagef(
err,
"failed to stat output file from nix-build, filename: %s",
outPath,
)
return
}
i.Logger.Debug("stat after", "name", after)
updated = before != after
f = FetchedFiles{
Options: path.Join(dest, i.Source.OutputPath, "options.json"),
}
return
}
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