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package cmdutil
import (
"net/http"
"os"
"path/filepath"
"strings"
"github.com/cli/cli/v2/context"
"github.com/cli/cli/v2/git"
"github.com/cli/cli/v2/internal/browser"
"github.com/cli/cli/v2/internal/config"
"github.com/cli/cli/v2/internal/ghrepo"
"github.com/cli/cli/v2/internal/prompter"
"github.com/cli/cli/v2/pkg/extensions"
"github.com/cli/cli/v2/pkg/iostreams"
)
type Factory struct {
AppVersion string
ExecutableName string
Browser browser.Browser
ExtensionManager extensions.ExtensionManager
GitClient *git.Client
IOStreams *iostreams.IOStreams
Prompter prompter.Prompter
BaseRepo func() (ghrepo.Interface, error)
Branch func() (string, error)
Config func() (config.Config, error)
HttpClient func() (*http.Client, error)
Remotes func() (context.Remotes, error)
}
// Executable is the path to the currently invoked binary
func (f *Factory) Executable() string {
ghPath := os.Getenv("GH_PATH")
if ghPath != "" {
return ghPath
}
if !strings.ContainsRune(f.ExecutableName, os.PathSeparator) {
f.ExecutableName = executable(f.ExecutableName)
}
return f.ExecutableName
}
// Finds the location of the executable for the current process as it's found in PATH, respecting symlinks.
// If the process couldn't determine its location, return fallbackName. If the executable wasn't found in
// PATH, return the absolute location to the program.
//
// The idea is that the result of this function is callable in the future and refers to the same
// installation of gh, even across upgrades. This is needed primarily for Homebrew, which installs software
// under a location such as `/usr/local/Cellar/gh/1.13.1/bin/gh` and symlinks it from `/usr/local/bin/gh`.
// When the version is upgraded, Homebrew will often delete older versions, but keep the symlink. Because of
// this, we want to refer to the `gh` binary as `/usr/local/bin/gh` and not as its internal Homebrew
// location.
//
// None of this would be needed if we could just refer to GitHub CLI as `gh`, i.e. without using an absolute
// path. However, for some reason Homebrew does not include `/usr/local/bin` in PATH when it invokes git
// commands to update its taps. If `gh` (no path) is being used as git credential helper, as set up by `gh
// auth login`, running `brew update` will print out authentication errors as git is unable to locate
// Homebrew-installed `gh`.
func executable(fallbackName string) string {
exe, err := os.Executable()
if err != nil {
return fallbackName
}
base := filepath.Base(exe)
path := os.Getenv("PATH")
for _, dir := range filepath.SplitList(path) {
p, err := filepath.Abs(filepath.Join(dir, base))
if err != nil {
continue
}
f, err := os.Lstat(p)
if err != nil {
continue
}
if p == exe {
return p
} else if f.Mode()&os.ModeSymlink != 0 {
realP, err := filepath.EvalSymlinks(p)
if err != nil {
continue
}
realExe, err := filepath.EvalSymlinks(exe)
if err != nil {
continue
}
if realP == realExe {
return p
}
}
}
return exe
}
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