Refactor repo_paths.go to use git rev-parse

This changes GetRepoPaths() to pull information from `git rev-parse`
instead of effectively reimplementing git's logic for pathfinding. This
change fixes issues with bare repos, esp. versioned homedir use cases,
by aligning lazygit's path handling to what git itself does.

This change also enables lazygit to run from arbitrary subdirectories of
a repository, including correct handling of symlinks, including "deep"
symlinks into a repo, worktree, a repo's submodules, etc.

Integration tests are now resilient against unintended side effects from
the host's environment variables. Of necessity, $PATH and $TERM are the
only env vars allowed through now.

1 files changed, 17 insertions, 11 deletions

diff --git a/pkg/commands/git_commands/working_tree_test.go b/pkg/commands/git_commands/working_tree_test.go
index cc46d4994..51fa88b7f 100644
--- a/pkg/commands/git_commands/working_tree_test.go
+++ b/pkg/commands/git_commands/working_tree_test.go
@@ -231,7 +231,7 @@ func TestWorkingTreeDiff(t *testing.T) {
 			ignoreWhitespace: false,
 			contextSize:      3,
 			runner: oscommands.NewFakeRunner(t).
-				ExpectGitArgs([]string{"diff", "--no-ext-diff", "--submodule", "--unified=3", "--color=always", "--", "test.txt"}, expectedResult, nil),
+				ExpectGitArgs([]string{"-C", "/path/to/worktree", "diff", "--no-ext-diff", "--submodule", "--unified=3", "--color=always", "--", "test.txt"}, expectedResult, nil),
 		},
 		{
 			testName: "cached",
@@ -245,7 +245,7 @@ func TestWorkingTreeDiff(t *testing.T) {
 			ignoreWhitespace: false,
 			contextSize:      3,
 			runner: oscommands.NewFakeRunner(t).
-				ExpectGitArgs([]string{"diff", "--no-ext-diff", "--submodule", "--unified=3", "--color=always", "--cached", "--", "test.txt"}, expectedResult, nil),
+				ExpectGitArgs([]string{"-C", "/path/to/worktree", "diff", "--no-ext-diff", "--submodule", "--unified=3", "--color=always", "--cached", "--", "test.txt"}, expectedResult, nil),
 		},
 		{
 			testName: "plain",
@@ -259,7 +259,7 @@ func TestWorkingTreeDiff(t *testing.T) {
 			ignoreWhitespace: false,
 			contextSize:      3,
 			runner: oscommands.NewFakeRunner(t).
-				ExpectGitArgs([]string{"diff", "--no-ext-diff", "--submodule", "--unified=3", "--color=never", "--", "test.txt"}, expectedResult, nil),
+				ExpectGitArgs([]string{"-C", "/path/to/worktree", "diff", "--no-ext-diff", "--submodule", "--unified=3", "--color=never", "--", "test.txt"}, expectedResult, nil),
 		},
 		{
 			testName: "File not tracked and file has no staged changes",
@@ -273,7 +273,7 @@ func TestWorkingTreeDiff(t *testing.T) {
 			ignoreWhitespace: false,
 			contextSize:      3,
 			runner: oscommands.NewFakeRunner(t).
-				ExpectGitArgs([]string{"diff", "--no-ext-diff", "--submodule", "--unified=3", "--color=always", "--no-index", "--", "/dev/null", "test.txt"}, expectedResult, nil),
+				ExpectGitArgs([]string{"-C", "/path/to/worktree", "diff", "--no-ext-diff", "--submodule", "--unified=3", "--color=always", "--no-index", "--", "/dev/null", "test.txt"}, expectedResult, nil),
 		},
 		{
 			testName: "Default case (ignore whitespace)",
@@ -287,7 +287,7 @@ func TestWorkingTreeDiff(t *testing.T) {
 			ignoreWhitespace: true,
 			contextSize:      3,
 			runner: oscommands.NewFakeRunner(t).
-				ExpectGitArgs([]string{"diff", "--no-ext-diff", "--submodule", "--unified=3", "--color=always", "--ignore-all-space", "--", "test.txt"}, expectedResult, nil),
+				ExpectGitArgs([]string{"-C", "/path/to/worktree", "diff", "--no-ext-diff", "--submodule", "--unified=3", "--color=always", "--ignore-all-space", "--", "test.txt"}, expectedResult, nil),
 		},
 		{
 			testName: "Show diff with custom context size",
@@ -301,7 +301,7 @@ func TestWorkingTreeDiff(t *testing.T) {
 			ignoreWhitespace: false,
 			contextSize:      17,
 			runner: oscommands.NewFakeRunner(t).
-				ExpectGitArgs([]string{"diff", "--no-ext-diff", "--submodule", "--unified=17", "--color=always", "--", "test.txt"}, expectedResult, nil),
+				ExpectGitArgs([]string{"-C", "/path/to/worktree", "diff", "--no-ext-diff", "--submodule", "--unified=17", "--color=always", "--", "test.txt"}, expectedResult, nil),
 		},
 	}
 
@@ -312,8 +312,11 @@ func TestWorkingTreeDiff(t *testing.T) {
 			appState := &config.AppState{}
 			appState.IgnoreWhitespaceInDiffView = s.ignoreWhitespace
 			appState.DiffContextSize = s.contextSize
+			repoPaths := RepoPaths{
+				worktreePath: "/path/to/worktree",
+			}
 
-			instance := buildWorkingTreeCommands(commonDeps{runner: s.runner, userConfig: userConfig, appState: appState})
+			instance := buildWorkingTreeCommands(commonDeps{runner: s.runner, userConfig: userConfig, appState: appState, repoPaths: &repoPaths})
 			result := instance.WorktreeFileDiff(s.file, s.plain, s.cached)
 			assert.Equal(t, expectedResult, result)
 			s.runner.CheckForMissingCalls()
@@ -345,7 +348,7 @@ func TestWorkingTreeShowFileDiff(t *testing.T) {
 			ignoreWhitespace: false,
 			contextSize:      3,
 			runner: oscommands.NewFakeRunner(t).
-				ExpectGitArgs([]string{"diff", "--no-ext-diff", "--submodule", "--unified=3", "--no-renames", "--color=always", "1234567890", "0987654321", "--", "test.txt"}, expectedResult, nil),
+				ExpectGitArgs([]string{"-C", "/path/to/worktree", "diff", "--no-ext-diff", "--submodule", "--unified=3", "--no-renames", "--color=always", "1234567890", "0987654321", "--", "test.txt"}, expectedResult, nil),
 		},
 		{
 			testName:         "Show diff with custom context size",
@@ -356,7 +359,7 @@ func TestWorkingTreeShowFileDiff(t *testing.T) {
 			ignoreWhitespace: false,
 			contextSize:      123,
 			runner: oscommands.NewFakeRunner(t).
-				ExpectGitArgs([]string{"diff", "--no-ext-diff", "--submodule", "--unified=123", "--no-renames", "--color=always", "1234567890", "0987654321", "--", "test.txt"}, expectedResult, nil),
+				ExpectGitArgs([]string{"-C", "/path/to/worktree", "diff", "--no-ext-diff", "--submodule", "--unified=123", "--no-renames", "--color=always", "1234567890", "0987654321", "--", "test.txt"}, expectedResult, nil),
 		},
 		{
 			testName:         "Default case (ignore whitespace)",
@@ -367,7 +370,7 @@ func TestWorkingTreeShowFileDiff(t *testing.T) {
 			ignoreWhitespace: true,
 			contextSize:      3,
 			runner: oscommands.NewFakeRunner(t).
-				ExpectGitArgs([]string{"diff", "--no-ext-diff", "--submodule", "--unified=3", "--no-renames", "--color=always", "1234567890", "0987654321", "--ignore-all-space", "--", "test.txt"}, expectedResult, nil),
+				ExpectGitArgs([]string{"-C", "/path/to/worktree", "diff", "--no-ext-diff", "--submodule", "--unified=3", "--no-renames", "--color=always", "1234567890", "0987654321", "--ignore-all-space", "--", "test.txt"}, expectedResult, nil),
 		},
 	}
 
@@ -378,8 +381,11 @@ func TestWorkingTreeShowFileDiff(t *testing.T) {
 			appState := &config.AppState{}
 			appState.IgnoreWhitespaceInDiffView = s.ignoreWhitespace
 			appState.DiffContextSize = s.contextSize
+			repoPaths := RepoPaths{
+				worktreePath: "/path/to/worktree",
+			}
 
-			instance := buildWorkingTreeCommands(commonDeps{runner: s.runner, userConfig: userConfig, appState: appState})
+			instance := buildWorkingTreeCommands(commonDeps{runner: s.runner, userConfig: userConfig, appState: appState, repoPaths: &repoPaths})
 
 			result, err := instance.ShowFileDiff(s.from, s.to, s.reverse, "test.txt", s.plain)
 			assert.NoError(t, err)