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cli,doctor: --version flag + CLI/install drift check

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Two pre-release polish items on the version-display surface.

  * --version on both binaries: cobra's Version field on the banger
    and bangerd roots renders a one-line summary (banger v0.1.0
    (commit abcd1234, built 2026-04-28T20:45:50Z)). The
    SetVersionTemplate override drops cobra's "{{.Name}} version"
    prefix — our string is already a complete sentence. The
    multi-line `banger version` subcommand is unchanged for callers
    that want the full SHA / built_at on separate lines.
  * Doctor "banger version" row: prints the running CLI's version +
    short commit + built-at, plus what /etc/banger/install.toml
    recorded at install time. Disagreement is the most common
    version-skew pitfall (stale CLI against fresh daemon, or vice
    versa) and a one-line warn is friendlier than tracking that down
    from a launch failure.
    Drift detection is suppressed when either side is dev/unknown
    (untagged build) — comparing a dev CLI against a tagged install
    is the developer-machine case, not a real problem.

formatVersionLine is in internal/cli (banger.go) and reused by
bangerd.go via a strings.Replace because bangerd's version line
should say "bangerd" not "banger". Slightly tilt-feeling but cheaper
than parameterising the helper for one caller.

Tests: TestVersionsDriftToleratesDevAndUnknown pins the four
branches (match, version diff, commit diff, dev-suppression). The
existing version-format test already runs through formatVersionLine
indirectly.

Live exercise:
  $ banger --version
  banger dev (commit 1c1ca7d6, built 2026-04-28T20:52:33Z)
  $ bangerd --version
  bangerd dev (commit 1c1ca7d6, built 2026-04-28T20:52:33Z)
  $ banger doctor | head
  ...
  PASS	banger version
    - CLI dev (commit 1c1ca7d6, built 2026-04-28T20:52:33Z)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Thales Maciel 2026-04-28 17:53:32 -03:00
parent 1c1ca7d6a4
commit 775525b592
No known key found for this signature in database
GPG key ID: 33112E6833C34679
4 changed files with 121 additions and 2 deletions
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22
internal/cli/banger.go
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@ -21,8 +21,9 @@ func NewBangerCommand() *cobra.Command {
func (d *deps) newRootCommand() *cobra.Command {
root := &cobra.Command{
Use: "banger",
Short: "Run development sandboxes as Firecracker microVMs",
Use: "banger",
Version: formatVersionLine(buildinfo.Current()),
Short: "Run development sandboxes as Firecracker microVMs",
Long: strings.TrimSpace(`
banger runs disposable development sandboxes as Firecracker microVMs.
Each sandbox boots in a few seconds, gets its own root filesystem and
@ -50,6 +51,9 @@ to diagnose host readiness problems.
SilenceErrors: true,
RunE: helpNoArgs,
}
// Drop cobra's default "{{.Name}} version {{.Version}}" wrapper —
// our Version string is already a complete sentence.
root.SetVersionTemplate("{{.Version}}\n")
root.AddCommand(
d.newDaemonCommand(),
d.newDoctorCommand(),
@ -186,3 +190,17 @@ func absolutizePaths(values ...*string) error {
func formatBuildInfoBlock(info buildinfo.Info) string {
return fmt.Sprintf("version: %s\ncommit: %s\nbuilt_at: %s\n", info.Version, info.Commit, info.BuiltAt)
}
// formatVersionLine renders a buildinfo.Info as a single line —
// "banger v0.1.0 (commit abcd1234, built 2026-04-28T20:45:50Z)" — for
// the `--version` flag. Long commit strings are truncated to the
// first 8 hex chars so the line stays scannable. The verbose
// multi-line form lives on `banger version` for callers that want
// the full SHA / built_at on separate lines.
func formatVersionLine(info buildinfo.Info) string {
commit := info.Commit
if len(commit) > 8 {
commit = commit[:8]
}
return fmt.Sprintf("banger %s (commit %s, built %s)", info.Version, commit, info.BuiltAt)
}