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main.go
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/*
Copyright 2014 The Kubernetes Authors All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// git-sync is a command that pulls a git repository to a local directory.
package main // import "k8s.io/git-sync/cmd/git-sync"
import (
"context"
"crypto/md5"
"encoding/json"
"errors"
"fmt"
"io"
"io/fs"
"net"
"net/http"
"net/http/pprof"
"net/url"
"os"
"os/exec"
"os/signal"
"os/user"
"path/filepath"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/golang-jwt/jwt/v4"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/spf13/pflag"
"golang.org/x/sys/unix"
"k8s.io/git-sync/pkg/cmd"
"k8s.io/git-sync/pkg/hook"
"k8s.io/git-sync/pkg/logging"
"k8s.io/git-sync/pkg/pid1"
"k8s.io/git-sync/pkg/version"
)
var (
metricSyncDuration = prometheus.NewSummaryVec(prometheus.SummaryOpts{
Name: "git_sync_duration_seconds",
Help: "Summary of git_sync durations",
}, []string{"status"})
metricSyncCount = prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "git_sync_count_total",
Help: "How many git syncs completed, partitioned by state (success, error, noop)",
}, []string{"status"})
metricFetchCount = prometheus.NewCounter(prometheus.CounterOpts{
Name: "git_fetch_count_total",
Help: "How many git fetches were run",
})
metricAskpassCount = prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "git_sync_askpass_calls",
Help: "How many git askpass calls completed, partitioned by state (success, error)",
}, []string{"status"})
metricRefreshGitHubAppTokenCount = prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "git_sync_refresh_github_app_token_count",
Help: "How many times the GitHub app token was refreshed, partitioned by state (success, error)",
}, []string{"status"})
)
func init() {
prometheus.MustRegister(metricSyncDuration)
prometheus.MustRegister(metricSyncCount)
prometheus.MustRegister(metricFetchCount)
prometheus.MustRegister(metricAskpassCount)
prometheus.MustRegister(metricRefreshGitHubAppTokenCount)
}
const (
metricKeySuccess = "success"
metricKeyError = "error"
metricKeyNoOp = "noop"
)
type submodulesMode string
const (
submodulesRecursive submodulesMode = "recursive"
submodulesShallow submodulesMode = "shallow"
submodulesOff submodulesMode = "off"
)
type gcMode string
const (
gcAuto = "auto"
gcAlways = "always"
gcAggressive = "aggressive"
gcOff = "off"
)
const defaultDirMode = os.FileMode(0775) // subject to umask
// repoSync represents the remote repo and the local sync of it.
type repoSync struct {
cmd string // the git command to run
root absPath // absolute path to the root directory
repo string // remote repo to sync
ref string // the ref to sync
depth int // for shallow sync
submodules submodulesMode // how to handle submodules
gc gcMode // garbage collection
link absPath // absolute path to the symlink to publish
authURL string // a URL to re-fetch credentials, or ""
sparseFile string // path to a sparse-checkout file
syncCount int // how many times have we synced?
log *logging.Logger
run cmd.Runner
staleTimeout time.Duration // time for worktrees to be cleaned up
appTokenExpiry time.Time // time when github app auth token expires
}
func main() {
// In case we come up as pid 1, act as init.
if os.Getpid() == 1 {
fmt.Fprintf(os.Stderr, "INFO: detected pid 1, running init handler\n")
code, err := pid1.ReRun()
if err == nil {
os.Exit(code)
}
fmt.Fprintf(os.Stderr, "FATAL: unhandled pid1 error: %v\n", err)
os.Exit(127)
}
//
// Declare flags inside main() so they are not used as global variables.
//
flVersion := pflag.Bool("version", false, "print the version and exit")
flHelp := pflag.BoolP("help", "h", false, "print help text and exit")
pflag.BoolVarP(flHelp, "__?", "?", false, "") // support -? as an alias to -h
mustMarkHidden("__?")
flManual := pflag.Bool("man", false, "print the full manual and exit")
flVerbose := pflag.IntP("verbose", "v",
envInt(0, "GITSYNC_VERBOSE"),
"logs at this V level and lower will be printed")
flRepo := pflag.String("repo",
envString("", "GITSYNC_REPO", "GIT_SYNC_REPO"),
"the git repository to sync (required)")
flRef := pflag.String("ref",
envString("HEAD", "GITSYNC_REF"),
"the git revision (branch, tag, or hash) to sync")
flDepth := pflag.Int("depth",
envInt(1, "GITSYNC_DEPTH", "GIT_SYNC_DEPTH"),
"create a shallow clone with history truncated to the specified number of commits")
flSubmodules := pflag.String("submodules",
envString("recursive", "GITSYNC_SUBMODULES", "GIT_SYNC_SUBMODULES"),
"git submodule behavior: one of 'recursive', 'shallow', or 'off'")
flSparseCheckoutFile := pflag.String("sparse-checkout-file",
envString("", "GITSYNC_SPARSE_CHECKOUT_FILE", "GIT_SYNC_SPARSE_CHECKOUT_FILE"),
"the path to a sparse-checkout file")
flRoot := pflag.String("root",
envString("", "GITSYNC_ROOT", "GIT_SYNC_ROOT"),
"the root directory for git-sync operations (required)")
flLink := pflag.String("link",
envString("", "GITSYNC_LINK", "GIT_SYNC_LINK"),
"the path (absolute or relative to --root) at which to create a symlink to the directory holding the checked-out files (defaults to the leaf dir of --repo)")
flErrorFile := pflag.String("error-file",
envString("", "GITSYNC_ERROR_FILE", "GIT_SYNC_ERROR_FILE"),
"the path (absolute or relative to --root) to an optional file into which errors will be written (defaults to disabled)")
flPeriod := pflag.Duration("period",
envDuration(10*time.Second, "GITSYNC_PERIOD", "GIT_SYNC_PERIOD"),
"how long to wait between syncs, must be >= 10ms; --wait overrides this")
flSyncTimeout := pflag.Duration("sync-timeout",
envDuration(120*time.Second, "GITSYNC_SYNC_TIMEOUT", "GIT_SYNC_SYNC_TIMEOUT"),
"the total time allowed for one complete sync, must be >= 10ms; --timeout overrides this")
flOneTime := pflag.Bool("one-time",
envBool(false, "GITSYNC_ONE_TIME", "GIT_SYNC_ONE_TIME"),
"exit after the first sync")
flSyncOnSignal := pflag.String("sync-on-signal",
envString("", "GITSYNC_SYNC_ON_SIGNAL", "GIT_SYNC_SYNC_ON_SIGNAL"),
"sync on receipt of the specified signal (e.g. SIGHUP)")
flMaxFailures := pflag.Int("max-failures",
envInt(0, "GITSYNC_MAX_FAILURES", "GIT_SYNC_MAX_FAILURES"),
"the number of consecutive failures allowed before aborting (-1 will retry forever")
flTouchFile := pflag.String("touch-file",
envString("", "GITSYNC_TOUCH_FILE", "GIT_SYNC_TOUCH_FILE"),
"the path (absolute or relative to --root) to an optional file which will be touched whenever a sync completes (defaults to disabled)")
flAddUser := pflag.Bool("add-user",
envBool(false, "GITSYNC_ADD_USER", "GIT_SYNC_ADD_USER"),
"add a record to /etc/passwd for the current UID/GID (needed to use SSH with an arbitrary UID)")
flGroupWrite := pflag.Bool("group-write",
envBool(false, "GITSYNC_GROUP_WRITE", "GIT_SYNC_GROUP_WRITE"),
"ensure that all data (repo, worktrees, etc.) is group writable")
flStaleWorktreeTimeout := pflag.Duration("stale-worktree-timeout", envDuration(0, "GITSYNC_STALE_WORKTREE_TIMEOUT"),
"how long to retain non-current worktrees")
flExechookCommand := pflag.String("exechook-command",
envString("", "GITSYNC_EXECHOOK_COMMAND", "GIT_SYNC_EXECHOOK_COMMAND"),
"an optional command to be run when syncs complete (must be idempotent)")
flExechookTimeout := pflag.Duration("exechook-timeout",
envDuration(30*time.Second, "GITSYNC_EXECHOOK_TIMEOUT", "GIT_SYNC_EXECHOOK_TIMEOUT"),
"the timeout for the exechook")
flExechookBackoff := pflag.Duration("exechook-backoff",
envDuration(3*time.Second, "GITSYNC_EXECHOOK_BACKOFF", "GIT_SYNC_EXECHOOK_BACKOFF"),
"the time to wait before retrying a failed exechook")
flWebhookURL := pflag.String("webhook-url",
envString("", "GITSYNC_WEBHOOK_URL", "GIT_SYNC_WEBHOOK_URL"),
"a URL for optional webhook notifications when syncs complete (must be idempotent)")
flWebhookMethod := pflag.String("webhook-method",
envString("POST", "GITSYNC_WEBHOOK_METHOD", "GIT_SYNC_WEBHOOK_METHOD"),
"the HTTP method for the webhook")
flWebhookStatusSuccess := pflag.Int("webhook-success-status",
envInt(200, "GITSYNC_WEBHOOK_SUCCESS_STATUS", "GIT_SYNC_WEBHOOK_SUCCESS_STATUS"),
"the HTTP status code indicating a successful webhook (0 disables success checks")
flWebhookTimeout := pflag.Duration("webhook-timeout",
envDuration(1*time.Second, "GITSYNC_WEBHOOK_TIMEOUT", "GIT_SYNC_WEBHOOK_TIMEOUT"),
"the timeout for the webhook")
flWebhookBackoff := pflag.Duration("webhook-backoff",
envDuration(3*time.Second, "GITSYNC_WEBHOOK_BACKOFF", "GIT_SYNC_WEBHOOK_BACKOFF"),
"the time to wait before retrying a failed webhook")
flUsername := pflag.String("username",
envString("", "GITSYNC_USERNAME", "GIT_SYNC_USERNAME"),
"the username to use for git auth")
flPassword := envFlagString("GITSYNC_PASSWORD", "",
"the password or personal access token to use for git auth",
"GIT_SYNC_PASSWORD")
flPasswordFile := pflag.String("password-file",
envString("", "GITSYNC_PASSWORD_FILE", "GIT_SYNC_PASSWORD_FILE"),
"the file from which the password or personal access token for git auth will be sourced")
flCredentials := pflagCredentialSlice("credential", envString("", "GITSYNC_CREDENTIAL"), "one or more credentials (see --man for details) available for authentication")
flSSHKeyFiles := pflag.StringArray("ssh-key-file",
envStringArray("/etc/git-secret/ssh", "GITSYNC_SSH_KEY_FILE", "GIT_SYNC_SSH_KEY_FILE", "GIT_SSH_KEY_FILE"),
"the SSH key(s) to use")
flSSHKnownHosts := pflag.Bool("ssh-known-hosts",
envBool(true, "GITSYNC_SSH_KNOWN_HOSTS", "GIT_SYNC_KNOWN_HOSTS", "GIT_KNOWN_HOSTS"),
"enable SSH known_hosts verification")
flSSHKnownHostsFile := pflag.String("ssh-known-hosts-file",
envString("/etc/git-secret/known_hosts", "GITSYNC_SSH_KNOWN_HOSTS_FILE", "GIT_SYNC_SSH_KNOWN_HOSTS_FILE", "GIT_SSH_KNOWN_HOSTS_FILE"),
"the known_hosts file to use")
flCookieFile := pflag.Bool("cookie-file",
envBool(false, "GITSYNC_COOKIE_FILE", "GIT_SYNC_COOKIE_FILE", "GIT_COOKIE_FILE"),
"use a git cookiefile (/etc/git-secret/cookie_file) for authentication")
flAskPassURL := pflag.String("askpass-url",
envString("", "GITSYNC_ASKPASS_URL", "GIT_SYNC_ASKPASS_URL", "GIT_ASKPASS_URL"),
"a URL to query for git credentials (username=<value> and password=<value>)")
flGithubBaseURL := pflag.String("github-base-url",
envString("https://api.github.com/", "GITSYNC_GITHUB_BASE_URL"),
"the GitHub base URL to use when making requests to GitHub when using GitHub app auth")
flGithubAppPrivateKey := envFlagString("GITSYNC_GITHUB_APP_PRIVATE_KEY", "",
"the private key to use for GitHub app auth")
flGithubAppPrivateKeyFile := pflag.String("github-app-private-key-file",
envString("", "GITSYNC_GITHUB_APP_PRIVATE_KEY_FILE"),
"the file from which the private key for GitHub app auth will be sourced")
flGithubAppClientID := pflag.String("github-app-client-id",
envString("", "GITSYNC_GITHUB_APP_CLIENT_ID"),
"the GitHub app client ID to use for GitHub app auth")
flGithubAppApplicationID := pflag.Int("github-app-application-id",
envInt(0, "GITSYNC_GITHUB_APP_APPLICATION_ID"),
"the GitHub app application ID to use for GitHub app auth")
flGithubAppInstallationID := pflag.Int("github-app-installation-id",
envInt(0, "GITSYNC_GITHUB_APP_INSTALLATION_ID"),
"the GitHub app installation ID to use for GitHub app auth")
flGitCmd := pflag.String("git",
envString("git", "GITSYNC_GIT", "GIT_SYNC_GIT"),
"the git command to run (subject to PATH search, mostly for testing)")
flGitConfig := pflag.String("git-config",
envString("", "GITSYNC_GIT_CONFIG", "GIT_SYNC_GIT_CONFIG"),
"additional git config options in 'section.var1:val1,\"section.sub.var2\":\"val2\"' format")
flGitGC := pflag.String("git-gc",
envString("always", "GITSYNC_GIT_GC", "GIT_SYNC_GIT_GC"),
"git garbage collection behavior: one of 'auto', 'always', 'aggressive', or 'off'")
flHTTPBind := pflag.String("http-bind",
envString("", "GITSYNC_HTTP_BIND", "GIT_SYNC_HTTP_BIND"),
"the bind address (including port) for git-sync's HTTP endpoint")
flHTTPMetrics := pflag.Bool("http-metrics",
envBool(false, "GITSYNC_HTTP_METRICS", "GIT_SYNC_HTTP_METRICS"),
"enable metrics on git-sync's HTTP endpoint")
flHTTPprof := pflag.Bool("http-pprof",
envBool(false, "GITSYNC_HTTP_PPROF", "GIT_SYNC_HTTP_PPROF"),
"enable the pprof debug endpoints on git-sync's HTTP endpoint")
// Obsolete flags, kept for compat.
flDeprecatedBranch := pflag.String("branch", envString("", "GIT_SYNC_BRANCH"),
"DEPRECATED: use --ref instead")
mustMarkDeprecated("branch", "use --ref instead")
flDeprecatedChmod := pflag.Int("change-permissions", envInt(0, "GIT_SYNC_PERMISSIONS"),
"DEPRECATED: use --group-write instead")
mustMarkDeprecated("change-permissions", "use --group-write instead")
flDeprecatedDest := pflag.String("dest", envString("", "GIT_SYNC_DEST"),
"DEPRECATED: use --link instead")
mustMarkDeprecated("dest", "use --link instead")
flDeprecatedMaxSyncFailures := pflag.Int("max-sync-failures", envInt(0, "GIT_SYNC_MAX_SYNC_FAILURES"),
"DEPRECATED: use --max-failures instead")
mustMarkDeprecated("max-sync-failures", "use --max-failures instead")
flDeprecatedPassword := pflag.String("password", "", // the env vars are not deprecated
"DEPRECATED: use --password-file or $GITSYNC_PASSWORD instead")
mustMarkDeprecated("password", "use --password-file or $GITSYNC_PASSWORD instead")
flDeprecatedRev := pflag.String("rev", envString("", "GIT_SYNC_REV"),
"DEPRECATED: use --ref instead")
mustMarkDeprecated("rev", "use --ref instead")
_ = pflag.Bool("ssh", false,
"DEPRECATED: this flag is no longer necessary")
mustMarkDeprecated("ssh", "no longer necessary")
flDeprecatedSyncHookCommand := pflag.String("sync-hook-command", envString("", "GIT_SYNC_HOOK_COMMAND"),
"DEPRECATED: use --exechook-command instead")
mustMarkDeprecated("sync-hook-command", "use --exechook-command instead")
flDeprecatedTimeout := pflag.Int("timeout", envInt(0, "GIT_SYNC_TIMEOUT"),
"DEPRECATED: use --sync-timeout instead")
mustMarkDeprecated("timeout", "use --sync-timeout instead")
flDeprecatedV := pflag.Int("v", -1,
"DEPRECATED: use -v or --verbose instead")
mustMarkDeprecated("v", "use -v or --verbose instead")
flDeprecatedWait := pflag.Float64("wait", envFloat(0, "GIT_SYNC_WAIT"),
"DEPRECATED: use --period instead")
mustMarkDeprecated("wait", "use --period instead")
// For whatever reason pflag hardcodes stderr for the "usage" line when
// using the default FlagSet. We tweak the output a bit anyway.
usage := func(out io.Writer, msg string) {
// When pflag parsing hits an error, it prints a message before and
// after the usage, which makes for nice reading.
if msg != "" {
fmt.Fprintln(out, msg)
}
fmt.Fprintf(out, "Usage: %s [FLAGS...]\n", filepath.Base(os.Args[0]))
fmt.Fprintln(out, "")
fmt.Fprintln(out, " FLAGS:")
pflag.CommandLine.SetOutput(out)
pflag.PrintDefaults()
fmt.Fprintln(out, "")
fmt.Fprintln(out, " ENVIRONMENT VARIABLES:")
printEnvFlags(out)
if msg != "" {
fmt.Fprintln(out, msg)
}
}
pflag.Usage = func() { usage(os.Stderr, "") }
//
// Parse and verify flags. Errors here are fatal.
//
pflag.Parse()
// Handle print-and-exit cases.
if *flVersion {
fmt.Fprintln(os.Stdout, version.VERSION)
os.Exit(0)
}
if *flHelp {
usage(os.Stdout, "")
os.Exit(0)
}
if *flManual {
printManPage()
os.Exit(0)
}
// Make sure we have a root dir in which to work.
if *flRoot == "" {
usage(os.Stderr, "required flag: --root must be specified")
os.Exit(1)
}
var absRoot absPath
if abs, err := absPath(*flRoot).Canonical(); err != nil {
fmt.Fprintf(os.Stderr, "FATAL: can't absolutize --root: %v\n", err)
os.Exit(1)
} else {
absRoot = abs
}
// Init logging very early, so most errors can be written to a file.
if *flDeprecatedV >= 0 {
// Back-compat
*flVerbose = *flDeprecatedV
}
log := func() *logging.Logger {
dir, file := makeAbsPath(*flErrorFile, absRoot).Split()
return logging.New(dir.String(), file, *flVerbose)
}()
cmdRunner := cmd.NewRunner(log)
if *flRepo == "" {
fatalConfigErrorf(log, true, "required flag: --repo must be specified")
}
switch {
case *flDeprecatedBranch != "" && (*flDeprecatedRev == "" || *flDeprecatedRev == "HEAD"):
// Back-compat
log.V(0).Info("setting --ref from deprecated --branch")
*flRef = *flDeprecatedBranch
case *flDeprecatedRev != "" && *flDeprecatedBranch == "":
// Back-compat
log.V(0).Info("setting --ref from deprecated --rev")
*flRef = *flDeprecatedRev
case *flDeprecatedBranch != "" && *flDeprecatedRev != "":
fatalConfigErrorf(log, true, "deprecated flag combo: can't set --ref from deprecated --branch and --rev (one or the other is OK)")
}
if *flRef == "" {
fatalConfigErrorf(log, true, "required flag: --ref must be specified")
}
if *flDepth < 0 { // 0 means "no limit"
fatalConfigErrorf(log, true, "invalid flag: --depth must be greater than or equal to 0")
}
switch submodulesMode(*flSubmodules) {
case submodulesRecursive, submodulesShallow, submodulesOff:
default:
fatalConfigErrorf(log, true, "invalid flag: --submodules must be one of %q, %q, or %q", submodulesRecursive, submodulesShallow, submodulesOff)
}
switch *flGitGC {
case gcAuto, gcAlways, gcAggressive, gcOff:
default:
fatalConfigErrorf(log, true, "invalid flag: --git-gc must be one of %q, %q, %q, or %q", gcAuto, gcAlways, gcAggressive, gcOff)
}
if *flDeprecatedDest != "" {
// Back-compat
log.V(0).Info("setting --link from deprecated --dest")
*flLink = *flDeprecatedDest
}
if *flLink == "" {
parts := strings.Split(strings.Trim(*flRepo, "/"), "/")
*flLink = parts[len(parts)-1]
}
if *flDeprecatedWait != 0 {
// Back-compat
log.V(0).Info("setting --period from deprecated --wait")
*flPeriod = time.Duration(int(*flDeprecatedWait*1000)) * time.Millisecond
}
if *flPeriod < 10*time.Millisecond {
fatalConfigErrorf(log, true, "invalid flag: --period must be at least 10ms")
}
if *flDeprecatedChmod != 0 {
fatalConfigErrorf(log, true, "deprecated flag: --change-permissions is no longer supported")
}
var syncSig syscall.Signal
if *flSyncOnSignal != "" {
if num, err := strconv.ParseInt(*flSyncOnSignal, 0, 0); err == nil {
// sync-on-signal value is a number
syncSig = syscall.Signal(num)
} else {
// sync-on-signal value is a name
syncSig = unix.SignalNum(*flSyncOnSignal)
if syncSig == 0 {
// last resort - maybe they said "HUP", meaning "SIGHUP"
syncSig = unix.SignalNum("SIG" + *flSyncOnSignal)
}
}
if syncSig == 0 {
fatalConfigErrorf(log, true, "invalid flag: --sync-on-signal must be a valid signal name or number")
}
}
if *flDeprecatedTimeout != 0 {
// Back-compat
log.V(0).Info("setting --sync-timeout from deprecated --timeout")
*flSyncTimeout = time.Duration(*flDeprecatedTimeout) * time.Second
}
if *flSyncTimeout < 10*time.Millisecond {
fatalConfigErrorf(log, true, "invalid flag: --sync-timeout must be at least 10ms")
}
if *flDeprecatedMaxSyncFailures != 0 {
// Back-compat
log.V(0).Info("setting --max-failures from deprecated --max-sync-failures")
*flMaxFailures = *flDeprecatedMaxSyncFailures
}
if *flDeprecatedSyncHookCommand != "" {
// Back-compat
log.V(0).Info("setting --exechook-command from deprecated --sync-hook-command")
*flExechookCommand = *flDeprecatedSyncHookCommand
}
if *flExechookCommand != "" {
if *flExechookTimeout < time.Second {
fatalConfigErrorf(log, true, "invalid flag: --exechook-timeout must be at least 1s")
}
if *flExechookBackoff < time.Second {
fatalConfigErrorf(log, true, "invalid flag: --exechook-backoff must be at least 1s")
}
}
if *flWebhookURL != "" {
if *flWebhookStatusSuccess == -1 {
// Back-compat: -1 and 0 mean the same things
*flWebhookStatusSuccess = 0
}
if *flWebhookStatusSuccess < 0 {
fatalConfigErrorf(log, true, "invalid flag: --webhook-success-status must be a valid HTTP code or 0")
}
if *flWebhookTimeout < time.Second {
fatalConfigErrorf(log, true, "invalid flag: --webhook-timeout must be at least 1s")
}
if *flWebhookBackoff < time.Second {
fatalConfigErrorf(log, true, "invalid flag: --webhook-backoff must be at least 1s")
}
}
if *flDeprecatedPassword != "" {
log.V(0).Info("setting $GITSYNC_PASSWORD from deprecated --password")
*flPassword = *flDeprecatedPassword
}
if *flUsername != "" {
if *flPassword == "" && *flPasswordFile == "" {
fatalConfigErrorf(log, true, "required flag: $GITSYNC_PASSWORD or --password-file must be specified when --username is specified")
}
if *flPassword != "" && *flPasswordFile != "" {
fatalConfigErrorf(log, true, "invalid flag: only one of $GITSYNC_PASSWORD and --password-file may be specified")
}
if u, err := url.Parse(*flRepo); err == nil { // it may not even parse as a URL, that's OK
if u.User != nil {
fatalConfigErrorf(log, true, "invalid flag: credentials may not be specified in --repo when --username is specified")
}
}
} else {
if *flPassword != "" {
fatalConfigErrorf(log, true, "invalid flag: $GITSYNC_PASSWORD may only be specified when --username is specified")
}
if *flPasswordFile != "" {
fatalConfigErrorf(log, true, "invalid flag: --password-file may only be specified when --username is specified")
}
}
if *flGithubAppApplicationID != 0 || *flGithubAppClientID != "" {
if *flGithubAppApplicationID != 0 && *flGithubAppClientID != "" {
fatalConfigErrorf(log, true, "invalid flag: only one of --github-app-application-id or --github-app-client-id may be specified")
}
if *flGithubAppInstallationID == 0 {
fatalConfigErrorf(log, true, "invalid flag: --github-app-installation-id must be specified when --github-app-application-id or --github-app-client-id are specified")
}
if *flGithubAppPrivateKey == "" && *flGithubAppPrivateKeyFile == "" {
fatalConfigErrorf(log, true, "invalid flag: $GITSYNC_GITHUB_APP_PRIVATE_KEY or --github-app-private-key-file must be specified when --github-app-application-id or --github-app-client-id are specified")
}
if *flGithubAppPrivateKey != "" && *flGithubAppPrivateKeyFile != "" {
fatalConfigErrorf(log, true, "invalid flag: only one of $GITSYNC_GITHUB_APP_PRIVATE_KEY or --github-app-private-key-file may be specified")
}
if *flUsername != "" {
fatalConfigErrorf(log, true, "invalid flag: --username may not be specified when --github-app-private-key-file is specified")
}
if *flPassword != "" {
fatalConfigErrorf(log, true, "invalid flag: --password may not be specified when --github-app-private-key-file is specified")
}
if *flPasswordFile != "" {
fatalConfigErrorf(log, true, "invalid flag: --password-file may not be specified when --github-app-private-key-file is specified")
}
} else {
if *flGithubAppApplicationID != 0 {
fatalConfigErrorf(log, true, "invalid flag: --github-app-application-id may only be specified when --github-app-private-key-file is specified")
}
if *flGithubAppInstallationID != 0 {
fatalConfigErrorf(log, true, "invalid flag: --github-app-installation-id may only be specified when --github-app-private-key-file is specified")
}
}
if len(*flCredentials) > 0 {
for _, cred := range *flCredentials {
if cred.URL == "" {
fatalConfigErrorf(log, true, "invalid flag: --credential URL must be specified")
}
if cred.Username == "" {
fatalConfigErrorf(log, true, "invalid flag: --credential username must be specified")
}
if cred.Password == "" && cred.PasswordFile == "" {
fatalConfigErrorf(log, true, "invalid flag: --credential password or password-file must be specified")
}
if cred.Password != "" && cred.PasswordFile != "" {
fatalConfigErrorf(log, true, "invalid flag: only one of --credential password and password-file may be specified")
}
}
}
if *flHTTPBind == "" {
if *flHTTPMetrics {
fatalConfigErrorf(log, true, "required flag: --http-bind must be specified when --http-metrics is set")
}
if *flHTTPprof {
fatalConfigErrorf(log, true, "required flag: --http-bind must be specified when --http-pprof is set")
}
}
//
// From here on, output goes through logging.
//
log.V(0).Info("starting up",
"version", version.VERSION,
"pid", os.Getpid(),
"uid", os.Getuid(),
"gid", os.Getgid(),
"home", os.Getenv("HOME"),
"flags", logSafeFlags(*flVerbose))
if _, err := exec.LookPath(*flGitCmd); err != nil {
log.Error(err, "FATAL: git executable not found", "git", *flGitCmd)
os.Exit(1)
}
// If the user asked for group-writable data, make sure the umask allows it.
if *flGroupWrite {
syscall.Umask(0002)
} else {
syscall.Umask(0022)
}
// Make sure the root exists. defaultDirMode ensures that this is usable
// as a volume when the consumer isn't running as the same UID. We do this
// very early so that we can normalize the path even when there are
// symlinks in play.
if err := os.MkdirAll(absRoot.String(), defaultDirMode); err != nil {
log.Error(err, "FATAL: can't make root dir", "path", absRoot)
os.Exit(1)
}
// Get rid of symlinks in the root path to avoid getting confused about
// them later. The path must exist for EvalSymlinks to work.
if delinked, err := filepath.EvalSymlinks(absRoot.String()); err != nil {
log.Error(err, "FATAL: can't normalize root path", "path", absRoot)
os.Exit(1)
} else {
absRoot = absPath(delinked)
}
if absRoot.String() != *flRoot {
log.V(0).Info("normalized root path", "root", *flRoot, "result", absRoot)
}
// Convert files into an absolute paths.
absLink := makeAbsPath(*flLink, absRoot)
absTouchFile := makeAbsPath(*flTouchFile, absRoot)
// Merge credential sources.
if *flUsername == "" {
// username and user@host URLs are validated as mutually exclusive
if u, err := url.Parse(*flRepo); err == nil { // it may not even parse as a URL, that's OK
// Note that `ssh://user@host/path` URLs need to retain the user
// field. Out of caution, we only handle HTTP(S) URLs here.
if u.User != nil && (u.Scheme == "http" || u.Scheme == "https") {
if user := u.User.Username(); user != "" {
*flUsername = user
}
if pass, found := u.User.Password(); found {
*flPassword = pass
}
u.User = nil
*flRepo = u.String()
}
}
}
if *flUsername != "" {
cred := credential{
URL: *flRepo,
Username: *flUsername,
Password: *flPassword,
PasswordFile: *flPasswordFile,
}
*flCredentials = append([]credential{cred}, (*flCredentials)...)
}
if *flAddUser {
if err := addUser(); err != nil {
log.Error(err, "FATAL: can't add user")
os.Exit(1)
}
}
// Capture the various git parameters.
git := &repoSync{
cmd: *flGitCmd,
root: absRoot,
repo: *flRepo,
ref: *flRef,
depth: *flDepth,
submodules: submodulesMode(*flSubmodules),
gc: gcMode(*flGitGC),
link: absLink,
authURL: *flAskPassURL,
sparseFile: *flSparseCheckoutFile,
log: log,
run: cmdRunner,
staleTimeout: *flStaleWorktreeTimeout,
}
// This context is used only for git credentials initialization. There are
// no long-running operations like `git fetch`, so hopefully 30 seconds will be enough.
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
// Log the git version.
if ver, _, err := cmdRunner.Run(ctx, "", nil, *flGitCmd, "version"); err != nil {
log.Error(err, "can't get git version")
os.Exit(1)
} else {
log.V(0).Info("git version", "version", ver)
}
// Don't pollute the user's .gitconfig if this is being run directly.
if f, err := os.CreateTemp("", "git-sync.gitconfig.*"); err != nil {
log.Error(err, "FATAL: can't create gitconfig file")
os.Exit(1)
} else {
gitConfig := f.Name()
f.Close()
os.Setenv("GIT_CONFIG_GLOBAL", gitConfig)
os.Setenv("GIT_CONFIG_NOSYSTEM", "true")
log.V(2).Info("created private gitconfig file", "path", gitConfig)
}
// Set various configs we want, but users might override.
if err := git.SetupDefaultGitConfigs(ctx); err != nil {
log.Error(err, "can't set default git configs")
os.Exit(1)
}
// Finish populating credentials.
for i := range *flCredentials {
cred := &(*flCredentials)[i]
if cred.PasswordFile != "" {
passwordFileBytes, err := os.ReadFile(cred.PasswordFile)
if err != nil {
log.Error(err, "can't read password file", "file", cred.PasswordFile)
os.Exit(1)
}
cred.Password = string(passwordFileBytes)
}
}
// If the --repo or any submodule uses SSH, we need to know which keys.
if err := git.SetupGitSSH(*flSSHKnownHosts, *flSSHKeyFiles, *flSSHKnownHostsFile); err != nil {
log.Error(err, "can't set up git SSH", "keyFiles", *flSSHKeyFiles, "useKnownHosts", *flSSHKnownHosts, "knownHostsFile", *flSSHKnownHostsFile)
os.Exit(1)
}
if *flCookieFile {
if err := git.SetupCookieFile(ctx); err != nil {
log.Error(err, "can't set up git cookie file")
os.Exit(1)
}
}
// This needs to be after all other git-related config flags.
if *flGitConfig != "" {
if err := git.SetupExtraGitConfigs(ctx, *flGitConfig); err != nil {
log.Error(err, "can't set additional git configs", "configs", *flGitConfig)
os.Exit(1)
}
}
// The scope of the initialization context ends here, so we call cancel to release resources associated with it.
cancel()
if *flHTTPBind != "" {
ln, err := net.Listen("tcp", *flHTTPBind)
if err != nil {
log.Error(err, "can't bind HTTP endpoint", "endpoint", *flHTTPBind)
os.Exit(1)
}
mux := http.NewServeMux()
reasons := []string{}
// This is a dumb liveliness check endpoint. Currently this checks
// nothing and will always return 200 if the process is live.
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if !getRepoReady() {
http.Error(w, "repo is not ready", http.StatusServiceUnavailable)
}
// Otherwise success
})
reasons = append(reasons, "liveness")
if *flHTTPMetrics {
mux.Handle("/metrics", promhttp.Handler())
reasons = append(reasons, "metrics")
}
if *flHTTPprof {
mux.HandleFunc("/debug/pprof/", pprof.Index)
mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
reasons = append(reasons, "pprof")
}
log.V(0).Info("serving HTTP", "endpoint", *flHTTPBind, "reasons", reasons)
go func() {
err := http.Serve(ln, mux)
log.Error(err, "HTTP server terminated")
os.Exit(1)
}()
}
// Startup webhooks goroutine
var webhookRunner *hook.HookRunner
if *flWebhookURL != "" {
log := log.WithName("webhook")
webhook := hook.NewWebhook(
*flWebhookURL,
*flWebhookMethod,
*flWebhookStatusSuccess,
*flWebhookTimeout,
log,
)
webhookRunner = hook.NewHookRunner(
webhook,
*flWebhookBackoff,
hook.NewHookData(),
log,
*flOneTime,
)
go webhookRunner.Run(context.Background())
}
// Startup exechooks goroutine
var exechookRunner *hook.HookRunner
if *flExechookCommand != "" {
log := log.WithName("exechook")
exechook := hook.NewExechook(
cmd.NewRunner(log),
*flExechookCommand,
func(hash string) string {
return git.worktreeFor(hash).Path().String()
},
[]string{},
*flExechookTimeout,
log,
)
exechookRunner = hook.NewHookRunner(
exechook,
*flExechookBackoff,
hook.NewHookData(),
log,
*flOneTime,
)
go exechookRunner.Run(context.Background())
}
// Setup signal notify channel
sigChan := make(chan os.Signal, 1)
if syncSig != 0 {
log.V(1).Info("installing signal handler", "signal", unix.SignalName(syncSig))
signal.Notify(sigChan, syncSig)
}
// Craft a function that can be called to refresh credentials when needed.
refreshCreds := func(ctx context.Context) error {
// These should all be mutually-exclusive configs.
for _, cred := range *flCredentials {
if err := git.StoreCredentials(ctx, cred.URL, cred.Username, cred.Password); err != nil {
return err
}
}
if *flAskPassURL != "" {
// When using an auth URL, the credentials can be dynamic, and need
// to be re-fetched each time.
if err := git.CallAskPassURL(ctx); err != nil {
metricAskpassCount.WithLabelValues(metricKeyError).Inc()
return err
}
metricAskpassCount.WithLabelValues(metricKeySuccess).Inc()
}
if (*flGithubAppPrivateKeyFile != "" || *flGithubAppPrivateKey != "") && *flGithubAppInstallationID != 0 && (*flGithubAppApplicationID != 0 || *flGithubAppClientID != "") {
if git.appTokenExpiry.Before(time.Now().Add(30 * time.Second)) {
if err := git.RefreshGitHubAppToken(ctx, *flGithubBaseURL, *flGithubAppPrivateKey, *flGithubAppPrivateKeyFile, *flGithubAppClientID, *flGithubAppApplicationID, *flGithubAppInstallationID); err != nil {
metricRefreshGitHubAppTokenCount.WithLabelValues(metricKeyError).Inc()
return err
}
metricRefreshGitHubAppTokenCount.WithLabelValues(metricKeySuccess).Inc()
}
}
return nil
}
failCount := 0
syncCount := uint64(0)
for {
start := time.Now()
ctx, cancel := context.WithTimeout(context.Background(), *flSyncTimeout)
if changed, hash, err := git.SyncRepo(ctx, refreshCreds); err != nil {
failCount++
updateSyncMetrics(metricKeyError, start)
if *flMaxFailures >= 0 && failCount >= *flMaxFailures {
// Exit after too many retries, maybe the error is not recoverable.
log.Error(err, "too many failures, aborting", "failCount", failCount)
os.Exit(1)
}
log.Error(err, "error syncing repo, will retry", "failCount", failCount)
} else {
// this might have been called before, but also might not have
setRepoReady()
// We treat the first loop as a sync, including sending hooks.
if changed || syncCount == 0 {
if absTouchFile != "" {
if err := touch(absTouchFile); err != nil {
log.Error(err, "failed to touch touch-file", "path", absTouchFile)
} else {
log.V(3).Info("touched touch-file", "path", absTouchFile)
}
}
if webhookRunner != nil {
webhookRunner.Send(hash)
}
if exechookRunner != nil {
exechookRunner.Send(hash)
}
updateSyncMetrics(metricKeySuccess, start)
} else {
updateSyncMetrics(metricKeyNoOp, start)
}
syncCount++
// Clean up old worktree(s) and run GC.
if err := git.cleanup(ctx); err != nil {
log.Error(err, "git cleanup failed")
}
// Determine if git-sync should terminate for one of several reasons
if *flOneTime {
// Wait for hooks to complete at least once, if not nil, before
// checking whether to stop program.
// Assumes that if hook channels are not nil, they will have at
// least one value before getting closed
exitCode := 0 // is 0 if all hooks succeed, else is 1
if exechookRunner != nil {
if err := exechookRunner.WaitForCompletion(); err != nil {
exitCode = 1
}
}
if webhookRunner != nil {
if err := webhookRunner.WaitForCompletion(); err != nil {
exitCode = 1
}
}
log.DeleteErrorFile()
log.V(0).Info("exiting after one sync", "status", exitCode)
os.Exit(exitCode)
}
if hash == git.ref {
log.V(0).Info("ref appears to be a git hash, no further sync needed", "ref", git.ref)
log.DeleteErrorFile()
sleepForever()
}
if failCount > 0 {
log.V(4).Info("resetting failure count", "failCount", failCount)
failCount = 0
}
log.DeleteErrorFile()
}
log.V(3).Info("next sync", "waitTime", flPeriod.String(), "syncCount", syncCount)
cancel()
// Sleep until the next sync. If syncSig is set then the sleep may
// be interrupted by that signal.
t := time.NewTimer(*flPeriod)
select {
case <-t.C:
case <-sigChan: