Initial commit
This commit is contained in:
441
pkg/repos/pull.go
Normal file
441
pkg/repos/pull.go
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@ -0,0 +1,441 @@
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/*
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* LURE - Linux User REpository
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* Copyright (C) 2023 Elara Musayelyan
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package repos
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import (
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"context"
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"errors"
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"io"
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"net/url"
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"os"
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"path/filepath"
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"reflect"
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"strings"
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"github.com/go-git/go-billy/v5"
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"github.com/go-git/go-billy/v5/osfs"
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"github.com/go-git/go-git/v5"
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"github.com/go-git/go-git/v5/plumbing"
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"github.com/go-git/go-git/v5/plumbing/format/diff"
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"github.com/pelletier/go-toml/v2"
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"go.elara.ws/vercmp"
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"lure.sh/lure/internal/config"
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"lure.sh/lure/internal/db"
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"lure.sh/lure/internal/shutils/decoder"
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"lure.sh/lure/internal/shutils/handlers"
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"lure.sh/lure/internal/types"
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"lure.sh/lure/pkg/distro"
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"lure.sh/lure/pkg/loggerctx"
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"mvdan.cc/sh/v3/expand"
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"mvdan.cc/sh/v3/interp"
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"mvdan.cc/sh/v3/syntax"
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)
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// Pull pulls the provided repositories. If a repo doesn't exist, it will be cloned
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// and its packages will be written to the DB. If it does exist, it will be pulled.
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// In this case, only changed packages will be processed if possible.
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// If repos is set to nil, the repos in the LURE config will be used.
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func Pull(ctx context.Context, repos []types.Repo) error {
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log := loggerctx.From(ctx)
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if repos == nil {
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repos = config.Config(ctx).Repos
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}
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for _, repo := range repos {
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repoURL, err := url.Parse(repo.URL)
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if err != nil {
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return err
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}
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log.Info("Pulling repository").Str("name", repo.Name).Send()
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repoDir := filepath.Join(config.GetPaths(ctx).RepoDir, repo.Name)
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var repoFS billy.Filesystem
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gitDir := filepath.Join(repoDir, ".git")
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// Only pull repos that contain valid git repos
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if fi, err := os.Stat(gitDir); err == nil && fi.IsDir() {
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r, err := git.PlainOpen(repoDir)
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if err != nil {
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return err
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}
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w, err := r.Worktree()
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if err != nil {
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return err
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}
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old, err := r.Head()
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if err != nil {
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return err
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}
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err = w.PullContext(ctx, &git.PullOptions{Progress: os.Stderr})
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if errors.Is(err, git.NoErrAlreadyUpToDate) {
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log.Info("Repository up to date").Str("name", repo.Name).Send()
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} else if err != nil {
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return err
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}
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repoFS = w.Filesystem
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// Make sure the DB is created even if the repo is up to date
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if !errors.Is(err, git.NoErrAlreadyUpToDate) || db.IsEmpty(ctx) {
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new, err := r.Head()
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if err != nil {
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return err
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}
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// If the DB was not present at startup, that means it's
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// empty. In this case, we need to update the DB fully
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// rather than just incrementally.
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if db.IsEmpty(ctx) {
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err = processRepoFull(ctx, repo, repoDir)
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if err != nil {
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return err
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}
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} else {
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err = processRepoChanges(ctx, repo, r, w, old, new)
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if err != nil {
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return err
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}
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}
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}
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} else {
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err = os.RemoveAll(repoDir)
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if err != nil {
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return err
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}
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err = os.MkdirAll(repoDir, 0o755)
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if err != nil {
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return err
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}
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_, err = git.PlainCloneContext(ctx, repoDir, false, &git.CloneOptions{
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URL: repoURL.String(),
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Progress: os.Stderr,
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})
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if err != nil {
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return err
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}
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err = processRepoFull(ctx, repo, repoDir)
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if err != nil {
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return err
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}
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repoFS = osfs.New(repoDir)
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}
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fl, err := repoFS.Open("lure-repo.toml")
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if err != nil {
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log.Warn("Git repository does not appear to be a valid LURE repo").Str("repo", repo.Name).Send()
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continue
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}
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var repoCfg types.RepoConfig
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err = toml.NewDecoder(fl).Decode(&repoCfg)
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if err != nil {
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return err
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}
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fl.Close()
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// If the version doesn't have a "v" prefix, it's not a standard version.
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// It may be "unknown" or a git version, but either way, there's no way
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// to compare it to the repo version, so only compare versions with the "v".
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if strings.HasPrefix(config.Version, "v") {
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if vercmp.Compare(config.Version, repoCfg.Repo.MinVersion) == -1 {
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log.Warn("LURE repo's minumum LURE version is greater than the current version. Try updating LURE if something doesn't work.").Str("repo", repo.Name).Send()
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}
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}
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}
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return nil
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}
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type actionType uint8
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const (
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actionDelete actionType = iota
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actionUpdate
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)
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type action struct {
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Type actionType
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File string
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}
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func processRepoChanges(ctx context.Context, repo types.Repo, r *git.Repository, w *git.Worktree, old, new *plumbing.Reference) error {
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oldCommit, err := r.CommitObject(old.Hash())
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if err != nil {
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return err
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}
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newCommit, err := r.CommitObject(new.Hash())
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if err != nil {
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return err
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}
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patch, err := oldCommit.Patch(newCommit)
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if err != nil {
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return err
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}
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var actions []action
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for _, fp := range patch.FilePatches() {
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from, to := fp.Files()
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if !isValid(from, to) {
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continue
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}
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if to == nil {
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actions = append(actions, action{
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Type: actionDelete,
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File: from.Path(),
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})
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} else if from == nil {
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actions = append(actions, action{
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Type: actionUpdate,
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File: to.Path(),
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})
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} else {
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if from.Path() != to.Path() {
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actions = append(actions,
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action{
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Type: actionDelete,
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File: from.Path(),
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},
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action{
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Type: actionUpdate,
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File: to.Path(),
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},
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)
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} else {
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actions = append(actions, action{
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Type: actionUpdate,
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File: to.Path(),
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})
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}
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}
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}
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repoDir := w.Filesystem.Root()
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parser := syntax.NewParser()
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for _, action := range actions {
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env := append(os.Environ(), "scriptdir="+filepath.Dir(filepath.Join(repoDir, action.File)))
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runner, err := interp.New(
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interp.Env(expand.ListEnviron(env...)),
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interp.ExecHandler(handlers.NopExec),
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interp.ReadDirHandler(handlers.RestrictedReadDir(repoDir)),
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interp.StatHandler(handlers.RestrictedStat(repoDir)),
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interp.OpenHandler(handlers.RestrictedOpen(repoDir)),
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interp.StdIO(handlers.NopRWC{}, handlers.NopRWC{}, handlers.NopRWC{}),
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)
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if err != nil {
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return err
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}
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switch action.Type {
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case actionDelete:
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if filepath.Base(action.File) != "lure.sh" {
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continue
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}
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scriptFl, err := oldCommit.File(action.File)
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if err != nil {
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return nil
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}
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r, err := scriptFl.Reader()
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if err != nil {
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return nil
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}
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var pkg db.Package
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err = parseScript(ctx, parser, runner, r, &pkg)
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if err != nil {
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return err
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}
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err = db.DeletePkgs(ctx, "name = ? AND repository = ?", pkg.Name, repo.Name)
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if err != nil {
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return err
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}
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case actionUpdate:
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if filepath.Base(action.File) != "lure.sh" {
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action.File = filepath.Join(filepath.Dir(action.File), "lure.sh")
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}
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scriptFl, err := newCommit.File(action.File)
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if err != nil {
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return nil
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}
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r, err := scriptFl.Reader()
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if err != nil {
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return nil
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}
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pkg := db.Package{
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Description: db.NewJSON(map[string]string{}),
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Homepage: db.NewJSON(map[string]string{}),
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Maintainer: db.NewJSON(map[string]string{}),
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Depends: db.NewJSON(map[string][]string{}),
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BuildDepends: db.NewJSON(map[string][]string{}),
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Repository: repo.Name,
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}
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err = parseScript(ctx, parser, runner, r, &pkg)
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if err != nil {
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return err
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}
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resolveOverrides(runner, &pkg)
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err = db.InsertPackage(ctx, pkg)
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if err != nil {
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return err
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}
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}
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}
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return nil
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}
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// isValid makes sure the path of the file being updated is valid.
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// It checks to make sure the file is not within a nested directory
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// and that it is called lure.sh.
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func isValid(from, to diff.File) bool {
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var path string
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if from != nil {
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path = from.Path()
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}
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if to != nil {
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path = to.Path()
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}
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match, _ := filepath.Match("*/*.sh", path)
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return match
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}
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func processRepoFull(ctx context.Context, repo types.Repo, repoDir string) error {
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glob := filepath.Join(repoDir, "/*/lure.sh")
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matches, err := filepath.Glob(glob)
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if err != nil {
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return err
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}
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parser := syntax.NewParser()
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for _, match := range matches {
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env := append(os.Environ(), "scriptdir="+filepath.Dir(match))
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runner, err := interp.New(
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interp.Env(expand.ListEnviron(env...)),
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interp.ExecHandler(handlers.NopExec),
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interp.ReadDirHandler(handlers.RestrictedReadDir(repoDir)),
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interp.StatHandler(handlers.RestrictedStat(repoDir)),
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interp.OpenHandler(handlers.RestrictedOpen(repoDir)),
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interp.StdIO(handlers.NopRWC{}, handlers.NopRWC{}, handlers.NopRWC{}),
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)
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if err != nil {
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return err
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}
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scriptFl, err := os.Open(match)
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if err != nil {
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return err
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}
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pkg := db.Package{
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Description: db.NewJSON(map[string]string{}),
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Homepage: db.NewJSON(map[string]string{}),
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Maintainer: db.NewJSON(map[string]string{}),
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Depends: db.NewJSON(map[string][]string{}),
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BuildDepends: db.NewJSON(map[string][]string{}),
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Repository: repo.Name,
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}
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err = parseScript(ctx, parser, runner, scriptFl, &pkg)
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if err != nil {
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return err
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}
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resolveOverrides(runner, &pkg)
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err = db.InsertPackage(ctx, pkg)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func parseScript(ctx context.Context, parser *syntax.Parser, runner *interp.Runner, r io.ReadCloser, pkg *db.Package) error {
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defer r.Close()
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fl, err := parser.Parse(r, "lure.sh")
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if err != nil {
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return err
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}
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runner.Reset()
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err = runner.Run(ctx, fl)
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if err != nil {
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return err
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}
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d := decoder.New(&distro.OSRelease{}, runner)
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d.Overrides = false
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d.LikeDistros = false
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return d.DecodeVars(pkg)
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}
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var overridable = map[string]string{
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"deps": "Depends",
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"build_deps": "BuildDepends",
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"desc": "Description",
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"homepage": "Homepage",
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"maintainer": "Maintainer",
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}
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func resolveOverrides(runner *interp.Runner, pkg *db.Package) {
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pkgVal := reflect.ValueOf(pkg).Elem()
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for name, val := range runner.Vars {
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for prefix, field := range overridable {
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if strings.HasPrefix(name, prefix) {
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override := strings.TrimPrefix(name, prefix)
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override = strings.TrimPrefix(override, "_")
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field := pkgVal.FieldByName(field)
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varVal := field.FieldByName("Val")
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varType := varVal.Type()
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switch varType.Elem().String() {
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case "[]string":
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varVal.SetMapIndex(reflect.ValueOf(override), reflect.ValueOf(val.List))
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case "string":
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varVal.SetMapIndex(reflect.ValueOf(override), reflect.ValueOf(val.Str))
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}
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break
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}
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}
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}
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}
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Reference in New Issue
Block a user