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package main
import (
"fmt"
"os"
"path/filepath"
"gitlab.com/gitlab-org/gitlab-shell/go/internal/command"
"gitlab.com/gitlab-org/gitlab-shell/go/internal/command/fallback"
"gitlab.com/gitlab-org/gitlab-shell/go/internal/command/readwriter"
"gitlab.com/gitlab-org/gitlab-shell/go/internal/config"
)
// findRootDir determines the root directory (and so, the location of the config
// file) from os.Executable()
func findRootDir() (string, error) {
if path := os.Getenv("GITLAB_SHELL_DIR"); path != "" {
return path, nil
}
path, err := os.Executable()
if err != nil {
return "", err
}
// Start: /opt/.../gitlab-shell/bin/gitlab-shell
// Ends: /opt/.../gitlab-shell
return filepath.Dir(filepath.Dir(path)), nil
}
// rubyExec will never return. It either replaces the current process with a
// Ruby interpreter, or outputs an error and kills the process.
func execRuby(rootDir string, readWriter *readwriter.ReadWriter) {
cmd := &fallback.Command{RootDir: rootDir, Args: os.Args}
if err := cmd.Execute(); err != nil {
fmt.Fprintf(readWriter.ErrOut, "Failed to exec: %v\n", err)
os.Exit(1)
}
}
func main() {
readWriter := &readwriter.ReadWriter{
Out: os.Stdout,
In: os.Stdin,
ErrOut: os.Stderr,
}
rootDir, err := findRootDir()
if err != nil {
fmt.Fprintln(readWriter.ErrOut, "Failed to determine root directory, exiting")
os.Exit(1)
}
// Fall back to Ruby in case of problems reading the config, but issue a
// warning as this isn't something we can sustain indefinitely
config, err := config.NewFromDir(rootDir)
if err != nil {
fmt.Fprintln(readWriter.ErrOut, "Failed to read config, falling back to gitlab-shell-ruby")
execRuby(rootDir, readWriter)
}
cmd, err := command.New(os.Args, config, readWriter)
if err != nil {
// For now this could happen if `SSH_CONNECTION` is not set on
// the environment
fmt.Fprintf(readWriter.ErrOut, "%v\n", err)
os.Exit(1)
}
// The command will write to STDOUT on execution or replace the current
// process in case of the `fallback.Command`
if err = cmd.Execute(); err != nil {
fmt.Fprintf(readWriter.ErrOut, "%v\n", err)
os.Exit(1)
}
}
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