Prevent hang in git cat-file if repository is not a valid repository and other fixes (#17991)

This PR contains multiple fixes. The most important of which is:

* Prevent hang in git cat-file if the repository is not a valid repository 
    
    Unfortunately it appears that if git cat-file is run in an invalid
    repository it will hang until stdin is closed. This will result in
    deadlocked /pulls pages and dangling git cat-file calls if a broken
    repository is tried to be reviewed or pulls exists for a broken
    repository.

    Fix #14734
    Fix #9271
    Fix #16113

Otherwise there are a few small other fixes included which this PR was initially intending to fix:

* Fix panic on partial compares due to missing PullRequestWorkInProgressPrefixes
* Fix links on pulls pages  due to regression from #17551 - by making most /issues routes match /pulls too - Fix #17983
* Fix links on feeds pages due to another regression from #17551 but also fix issue with syncing tags - Fix #17943
* Add missing locale entries for oauth group claims
* Prevent NPEs if ColorFormat is called on nil users, repos or teams.

6 files changed, 93 insertions, 0 deletions

diff --git a/models/action.go b/models/action.go
index da9e6776b1..26d05730c5 100644
--- a/models/action.go
+++ b/models/action.go
@@ -23,6 +23,7 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/modules/util"
 
 	"xorm.io/builder"
 )
@@ -252,6 +253,21 @@ func (a *Action) GetBranch() string {
 	return strings.TrimPrefix(a.RefName, git.BranchPrefix)
 }
 
+// GetRefLink returns the action's ref link.
+func (a *Action) GetRefLink() string {
+	switch {
+	case strings.HasPrefix(a.RefName, git.BranchPrefix):
+		return a.GetRepoLink() + "/src/branch/" + util.PathEscapeSegments(strings.TrimPrefix(a.RefName, git.BranchPrefix))
+	case strings.HasPrefix(a.RefName, git.TagPrefix):
+		return a.GetRepoLink() + "/src/tag/" + util.PathEscapeSegments(strings.TrimPrefix(a.RefName, git.TagPrefix))
+	case len(a.RefName) == 40 && git.SHAPattern.MatchString(a.RefName):
+		return a.GetRepoLink() + "/src/commit/" + a.RefName
+	default:
+		// FIXME: we will just assume it's a branch - this was the old way - at some point we may want to enforce that there is always a ref here.
+		return a.GetRepoLink() + "/src/branch/" + util.PathEscapeSegments(strings.TrimPrefix(a.RefName, git.BranchPrefix))
+	}
+}
+
 // GetTag returns the action's repository tag.
 func (a *Action) GetTag() string {
 	return strings.TrimPrefix(a.RefName, git.TagPrefix)
diff --git a/models/migrations/migrations_test.go b/models/migrations/migrations_test.go
index 10ba3dde09..ceef0954e1 100644
--- a/models/migrations/migrations_test.go
+++ b/models/migrations/migrations_test.go
@@ -207,6 +207,25 @@ func prepareTestEnv(t *testing.T, skip int, syncModels ...interface{}) (*xorm.En
 
 	assert.NoError(t, com.CopyDir(path.Join(filepath.Dir(setting.AppPath), "integrations/gitea-repositories-meta"),
 		setting.RepoRootPath))
+	ownerDirs, err := os.ReadDir(setting.RepoRootPath)
+	if err != nil {
+		assert.NoError(t, err, "unable to read the new repo root: %v\n", err)
+	}
+	for _, ownerDir := range ownerDirs {
+		if !ownerDir.Type().IsDir() {
+			continue
+		}
+		repoDirs, err := os.ReadDir(filepath.Join(setting.RepoRootPath, ownerDir.Name()))
+		if err != nil {
+			assert.NoError(t, err, "unable to read the new repo root: %v\n", err)
+		}
+		for _, repoDir := range repoDirs {
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "pack"), 0755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "info"), 0755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "heads"), 0755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "tag"), 0755)
+		}
+	}
 
 	if err := deleteDB(); err != nil {
 		t.Errorf("unable to reset database: %v", err)
diff --git a/models/org_team.go b/models/org_team.go
index 3d4a2882c7..7eac0f7bc5 100644
--- a/models/org_team.go
+++ b/models/org_team.go
@@ -114,6 +114,14 @@ func SearchTeam(opts *SearchTeamOptions) ([]*Team, int64, error) {
 
 // ColorFormat provides a basic color format for a Team
 func (t *Team) ColorFormat(s fmt.State) {
+	if t == nil {
+		log.ColorFprintf(s, "%d:%s (OrgID: %d) %-v",
+			log.NewColoredIDValue(0),
+			"<nil>",
+			log.NewColoredIDValue(0),
+			0)
+		return
+	}
 	log.ColorFprintf(s, "%d:%s (OrgID: %d) %-v",
 		log.NewColoredIDValue(t.ID),
 		t.Name,
diff --git a/models/repo/repo.go b/models/repo/repo.go
index 43ac9fb62a..d0136e9c66 100644
--- a/models/repo/repo.go
+++ b/models/repo/repo.go
@@ -173,6 +173,13 @@ func (repo *Repository) SanitizedOriginalURL() string {
 
 // ColorFormat returns a colored string to represent this repo
 func (repo *Repository) ColorFormat(s fmt.State) {
+	if repo == nil {
+		log.ColorFprintf(s, "%d:%s/%s",
+			log.NewColoredIDValue(0),
+			"<nil>",
+			"<nil>")
+		return
+	}
 	log.ColorFprintf(s, "%d:%s/%s",
 		log.NewColoredIDValue(repo.ID),
 		repo.OwnerName,
diff --git a/models/unittest/testdb.go b/models/unittest/testdb.go
index 8083c607e5..c798dbefb1 100644
--- a/models/unittest/testdb.go
+++ b/models/unittest/testdb.go
@@ -104,6 +104,26 @@ func MainTest(m *testing.M, pathToGiteaRoot string, fixtureFiles ...string) {
 		fatalTestError("util.CopyDir: %v\n", err)
 	}
 
+	ownerDirs, err := os.ReadDir(setting.RepoRootPath)
+	if err != nil {
+		fatalTestError("unable to read the new repo root: %v\n", err)
+	}
+	for _, ownerDir := range ownerDirs {
+		if !ownerDir.Type().IsDir() {
+			continue
+		}
+		repoDirs, err := os.ReadDir(filepath.Join(setting.RepoRootPath, ownerDir.Name()))
+		if err != nil {
+			fatalTestError("unable to read the new repo root: %v\n", err)
+		}
+		for _, repoDir := range repoDirs {
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "pack"), 0755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "info"), 0755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "heads"), 0755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "tag"), 0755)
+		}
+	}
+
 	exitStatus := m.Run()
 	if err = util.RemoveAll(repoRootPath); err != nil {
 		fatalTestError("util.RemoveAll: %v\n", err)
@@ -152,5 +172,22 @@ func PrepareTestEnv(t testing.TB) {
 	assert.NoError(t, util.RemoveAll(setting.RepoRootPath))
 	metaPath := filepath.Join(giteaRoot, "integrations", "gitea-repositories-meta")
 	assert.NoError(t, util.CopyDir(metaPath, setting.RepoRootPath))
+
+	ownerDirs, err := os.ReadDir(setting.RepoRootPath)
+	assert.NoError(t, err)
+	for _, ownerDir := range ownerDirs {
+		if !ownerDir.Type().IsDir() {
+			continue
+		}
+		repoDirs, err := os.ReadDir(filepath.Join(setting.RepoRootPath, ownerDir.Name()))
+		assert.NoError(t, err)
+		for _, repoDir := range repoDirs {
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "pack"), 0755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "info"), 0755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "heads"), 0755)
+			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "tag"), 0755)
+		}
+	}
+
 	base.SetupGiteaRoot() // Makes sure GITEA_ROOT is set
 }
diff --git a/models/user/user.go b/models/user/user.go
index 80ddcdba37..d56a225d5f 100644
--- a/models/user/user.go
+++ b/models/user/user.go
@@ -160,6 +160,12 @@ type SearchOrganizationsOptions struct {
 
 // ColorFormat writes a colored string to identify this struct
 func (u *User) ColorFormat(s fmt.State) {
+	if u == nil {
+		log.ColorFprintf(s, "%d:%s",
+			log.NewColoredIDValue(0),
+			log.NewColoredValue("<nil>"))
+		return
+	}
 	log.ColorFprintf(s, "%d:%s",
 		log.NewColoredIDValue(u.ID),
 		log.NewColoredValue(u.Name))