add goreleaser configuration for binaries and deb/rpm packages

- build static binaries for linux, darwin and freebsd
- create deb and rpm packages that register gosh in /etc/shells
- publish releases to Gitea
- add --version flag, set at build time via ldflags

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -1 +1,2 @@
 gosh
+dist/

.goreleaser.yaml

@@ -0,0 +1,103 @@
+# yaml-language-server: $schema=https://goreleaser.com/static/schema.json
+# Release: git tag -a v0.1.0 -m "v0.1.0" && git push origin v0.1.0 && goreleaser release --clean
+# Local test (no publishing): goreleaser release --snapshot --clean
+version: 2
+
+project_name: gosh
+
+# GITHUB_TOKEN/GITLAB_TOKEN may also be set; always use Gitea.
+force_token: gitea
+
+before:
+  hooks:
+    - go mod tidy
+    - go test ./...
+
+builds:
+  - id: gosh
+    binary: gosh
+    main: .
+    env:
+      - CGO_ENABLED=0
+    flags:
+      - -trimpath
+    ldflags:
+      - -s -w -X main.version={{ .Version }}
+    goos:
+      - linux
+      - darwin
+      - freebsd
+    goarch:
+      - amd64
+      - arm64
+      - arm
+      - "386"
+    goarm:
+      - "7"
+    ignore:
+      - goos: darwin
+        goarch: "386"
+      - goos: darwin
+        goarch: arm
+    mod_timestamp: "{{ .CommitTimestamp }}"
+
+archives:
+  - id: gosh
+    formats: [tar.gz]
+    name_template: >-
+      {{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}{{ with .Arm }}v{{ . }}{{ end }}
+    files:
+      - src: README.md
+        info:
+          mode: 0644
+
+nfpms:
+  - id: gosh
+    package_name: gosh
+    file_name_template: "{{ .ConventionalFileName }}"
+    ids: [gosh]
+    formats:
+      - deb
+      - rpm
+    vendor: Florian Walther
+    maintainer: Florian Walther <florian.walther@certainity.com>
+    homepage: https://gitea.scu.si/Florian.Walther/gosh
+    description: |-
+      gosh - a simple shell written in Go
+       Proof of concept with history, tab completion,
+       tilde and environment variable expansion.
+    license: ""
+    section: shells
+    priority: optional
+    bindir: /usr/bin
+    contents:
+      - src: README.md
+        dst: /usr/share/doc/gosh/README.md
+        file_info:
+          mode: 0644
+    scripts:
+      postinstall: packaging/scripts/postinstall.sh
+      postremove: packaging/scripts/postremove.sh
+
+checksum:
+  name_template: checksums.txt
+
+snapshot:
+  version_template: "{{ incpatch .Version }}-next"
+
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - "^docs:"
+      - "^test:"
+
+# Repository is hosted on Gitea; requires GITEA_TOKEN in the environment.
+gitea_urls:
+  api: https://gitea.scu.si/api/v1
+  download: https://gitea.scu.si
+
+release:
+  gitea:
+    owner: Florian.Walther
+    name: gosh

README.md

@@ -44,3 +44,20 @@ _gosh is not meant for production use, it is just a proof of concept._
 ```bash
 go build ./
 ```
+
+## Release
+
+Binaries sowie `.deb`- und `.rpm`-Pakete werden mit [GoReleaser](https://goreleaser.com) gebaut (Konfiguration: `.goreleaser.yaml`).
+
+```bash
+# lokal testen, ohne etwas zu veröffentlichen (Ergebnis in dist/)
+goreleaser release --snapshot --clean
+
+# Release auf Gitea veröffentlichen
+export GITEA_TOKEN=...
+git tag -a v0.1.0 -m "v0.1.0"
+git push origin v0.1.0
+goreleaser release --clean
+```
+
+Das Paket installiert `/usr/bin/gosh` und trägt die Shell in `/etc/shells` ein, sodass sie mit `chsh -s /usr/bin/gosh` gesetzt werden kann.

main.go

@@ -19,6 +19,9 @@ import (
 // ErrNoPath is returned when 'cd' was called without a second argument.
 var ErrNoPath = errors.New("path required")
 
+// version is set at build time via -ldflags "-X main.version=..."
+var version = "dev"
+
 // previousDir tracks the previous working directory for 'cd -' support
 var previousDir string
 
@@ -483,6 +486,11 @@ func completeFilePath(line, prefix string) []string {
 }
 
 func main() {
+	if len(os.Args) > 1 && (os.Args[1] == "--version" || os.Args[1] == "-V") {
+		fmt.Println("gosh", version)
+		return
+	}
+
 	// Ctrl+C sends SIGINT to the whole foreground process group. Catch it so
 	// that it only stops the running command and not the shell. (signal.Ignore
 	// would be inherited by the child processes.)

packaging/scripts/postinstall.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+# Register gosh as a login shell in /etc/shells.
+set -e
+
+if command -v add-shell >/dev/null 2>&1; then
+	add-shell /usr/bin/gosh
+elif ! grep -qx /usr/bin/gosh /etc/shells 2>/dev/null; then
+	echo /usr/bin/gosh >> /etc/shells
+fi

packaging/scripts/postremove.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+# Remove gosh from /etc/shells on uninstall (not on upgrade).
+# deb passes "remove"/"purge", rpm passes "0" on final removal.
+set -e
+
+case "$1" in
+	remove|purge|0)
+		if command -v remove-shell >/dev/null 2>&1; then
+			remove-shell /usr/bin/gosh
+		elif [ -f /etc/shells ]; then
+			sed -i '\|^/usr/bin/gosh$|d' /etc/shells
+		fi
+		;;
+esac