v/cmd/tools/gen_vc.v

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// This tool regenerates V's bootstrap .c files
// every time the V master branch is updated.
// if run with the --serve flag it will run in webhook
// server mode awaiting a request to http://host:port/genhook
// available command line flags:
// --work-dir gen_vc's working directory
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// --purge force purge the local repositories
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// --serve run in webhook server mode
// --port port for http server to listen on
// --log-to either 'file' or 'terminal'
// --log-file path to log file used when --log-to is 'file'
// --dry-run dont push anything to remote repo
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// --force force update even if already up to date
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module main
import (
os
log
flag
time
vweb
net.urllib
)
// git credentials
const(
git_username = os.getenv('GITUSER')
git_password = os.getenv('GITPASS')
)
// repository
const(
// git repo
git_repo_v = 'github.com/vlang/v'
git_repo_vc = 'github.com/vlang/vc'
// local repo directories
git_repo_dir_v = 'v'
git_repo_dir_vc = 'vc'
)
// gen_vc
const(
// name
app_name = 'gen_vc'
// version
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app_version = '0.1.2'
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// description
app_description = 'This tool regenerates V\'s bootstrap .c files every time the V master branch is updated.'
// assume something went wrong if file size less than this
too_short_file_limit = 5000
// create a .c file for these os's
vc_build_oses = [
'nix', // all nix based os
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'windows'
]
)
// default options (overridden by flags)
const(
// gen_vc working directory
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work_dir = '/tmp/gen_vc'
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// dont push anything to remote repo
dry_run = false
// server port
server_port = 7171
// log file
log_file = '$work_dir/log.txt'
// log_to is either 'file' or 'terminal'
log_to = 'terminal'
)
// errors
const(
err_msg_build = 'error building'
err_msg_make = 'make failed'
err_msg_gen_c = 'failed to generate .c file'
err_msg_cmd_x = 'error running cmd'
)
struct GenVC {
// logger
logger &log.Log
// flag options
options FlagOptions
mut:
// true if error was experienced running generate
gen_error bool
}
// webhook server
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pub struct WebhookServer {
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pub mut:
vweb vweb.Context
gen_vc &GenVC
}
// storage for flag options
struct FlagOptions {
work_dir string
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purge bool
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serve bool
port int
log_to string
log_file string
dry_run bool
force bool
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}
fn main() {
mut fp := flag.new_flag_parser(os.args.clone())
fp.application(app_name)
fp.version(app_version)
fp.description(app_description)
fp.skip_executable()
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show_help:=fp.bool('help', 0, false, 'Show this help screen\n')
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flag_options := parse_flags(mut fp)
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if( show_help ){ println( fp.usage() ) exit(0) }
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fp.finalize() or {
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eprintln(err)
println(fp.usage())
return
}
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// webhook server mode
if flag_options.serve {
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vweb.run<WebhookServer>(flag_options.port)
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}
// cmd mode
else {
mut gen_vc := new_gen_vc(flag_options)
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gen_vc.init()
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gen_vc.generate()
}
}
// new GenVC
fn new_gen_vc(flag_options FlagOptions) &GenVC {
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mut logger := &log.Log{}
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logger.set_level(.debug)
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if flag_options.log_to == 'file' {
logger.set_full_logpath( flag_options.log_file )
}
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return &GenVC{
options: flag_options
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logger: logger
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}
}
// WebhookServer init
pub fn (ws mut WebhookServer) init() {
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mut fp := flag.new_flag_parser(os.args.clone())
flag_options := parse_flags(mut fp)
ws.gen_vc = new_gen_vc(flag_options)
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ws.gen_vc.init()
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//ws.gen_vc = new_gen_vc(flag_options)
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}
// gen webhook
pub fn (ws mut WebhookServer) genhook() {
ws.gen_vc.generate()
// error in generate
if ws.gen_vc.gen_error {
ws.vweb.json('{status: "failed"}')
return
}
ws.vweb.json('{status: "ok"}')
}
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pub fn (ws &WebhookServer) reset() {
}
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// parse flags to FlagOptions struct
fn parse_flags(fp mut flag.FlagParser) FlagOptions {
return FlagOptions{
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serve : fp.bool('serve', 0, false, 'run in webhook server mode')
work_dir : fp.string('work-dir', 0, work_dir, 'gen_vc working directory')
purge : fp.bool('purge', 0, false, 'force purge the local repositories')
port : fp.int('port', 0, server_port, 'port for web server to listen on')
log_to : fp.string('log-to', 0, log_to, 'log to is \'file\' or \'terminal\'')
log_file : fp.string('log-file', 0, log_file, 'log file to use when log-to is \'file\'')
dry_run : fp.bool('dry-run', 0, dry_run, 'when specified dont push anything to remote repo')
force : fp.bool('force', 0, false, 'force update even if already up to date')
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}
}
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// init
fn (gen_vc mut GenVC) init() {
// purge repos if flag is passed
if gen_vc.options.purge {
gen_vc.purge_repos()
}
}
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// regenerate
fn (gen_vc mut GenVC) generate() {
// set errors to false
gen_vc.gen_error = false
// check if gen_vc dir exists
if !os.is_dir(gen_vc.options.work_dir) {
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// try create
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os.mkdir(gen_vc.options.work_dir) or { panic(err) }
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// still dosen't exist... we have a problem
if !os.is_dir(gen_vc.options.work_dir) {
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gen_vc.logger.error('error creating directory: $gen_vc.options.work_dir')
gen_vc.gen_error = true
return
}
}
// cd to gen_vc dir
os.chdir(gen_vc.options.work_dir)
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// if we are not running with the --serve flag (webhook server)
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// rather than deleting and re-downloading the repo each time
// first check to see if the local v repo is behind master
// if it isn't behind theres no point continuing further
if !gen_vc.options.serve && os.is_dir(git_repo_dir_v) {
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gen_vc.cmd_exec('git -C $git_repo_dir_v checkout master')
// fetch the remote repo just in case there are newer commits there
gen_vc.cmd_exec('git -C $git_repo_dir_v fetch')
git_status := gen_vc.cmd_exec('git -C $git_repo_dir_v status')
if !git_status.contains('behind') && !gen_vc.options.force {
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gen_vc.logger.warn('v repository is already up to date.')
return
}
}
// delete repos
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gen_vc.purge_repos()
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// clone repos
gen_vc.cmd_exec('git clone --depth 1 https://$git_repo_v $git_repo_dir_v')
gen_vc.cmd_exec('git clone --depth 1 https://$git_repo_vc $git_repo_dir_vc')
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// get output of git log -1 (last commit)
git_log_v := gen_vc.cmd_exec('git -C $git_repo_dir_v log -1 --format="commit %H%nDate: %ci%nDate Unix: %ct%nSubject: %s"')
git_log_vc := gen_vc.cmd_exec('git -C $git_repo_dir_vc log -1 --format="Commit %H%nDate: %ci%nDate Unix: %ct%nSubject: %s"')
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// date of last commit in each repo
ts_v := git_log_v.find_between('Date:', '\n').trim_space()
ts_vc := git_log_vc.find_between('Date:', '\n').trim_space()
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// parse time as string to time.Time
last_commit_time_v := time.parse(ts_v) or {
panic(err)
}
last_commit_time_vc := time.parse(ts_vc) or {
panic(err)
}
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// git dates are in users local timezone and v time.parse does not parse
// timezones at the moment, so for now get unix timestamp from output also
t_unix_v := git_log_v.find_between('Date Unix:', '\n').trim_space().int()
t_unix_vc := git_log_vc.find_between('Date Unix:', '\n').trim_space().int()
// last commit hash in v repo
last_commit_hash_v := git_log_v.find_between('commit', '\n').trim_space()
last_commit_hash_v_short := last_commit_hash_v[..7]
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// subject
last_commit_subject := git_log_v.find_between('Subject:', '\n').trim_space().replace('"', '\\"')
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// log some info
gen_vc.logger.debug('last commit time ($git_repo_v): ' + last_commit_time_v.format_ss())
gen_vc.logger.debug('last commit time ($git_repo_vc): ' + last_commit_time_vc.format_ss())
gen_vc.logger.debug('last commit hash ($git_repo_v): $last_commit_hash_v')
gen_vc.logger.debug('last commit subject ($git_repo_v): $last_commit_subject')
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// if vc repo already has a newer commit than the v repo, assume it's up to date
if t_unix_vc >= t_unix_v && !gen_vc.options.force {
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gen_vc.logger.warn('vc repository is already up to date.')
return
}
// try build v for current os (linux in this case)
gen_vc.cmd_exec('make -C $git_repo_dir_v')
v_exec := '$git_repo_dir_v/v'
// check if make was successful
gen_vc.assert_file_exists_and_is_not_too_short(v_exec, err_msg_make)
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// build v.c for each os
for os_name in vc_build_oses {
vc_suffix := if os_name == 'nix' { '' } else { '_${os_name[..3]}' }
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v_flags := if os_name == 'nix' { '-os cross' } else { '-os $os_name' }
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c_file := 'v${vc_suffix}.c'
// try generate .c file
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gen_vc.cmd_exec('$v_exec $v_flags -o $c_file $git_repo_dir_v/cmd/v')
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// check if the c file seems ok
gen_vc.assert_file_exists_and_is_not_too_short(c_file, err_msg_gen_c)
// embed the latest v commit hash into the c file
gen_vc.cmd_exec('sed -i \'1s/^/#define V_COMMIT_HASH "$last_commit_hash_v_short"\\n/\' $c_file')
// move to vc repo
gen_vc.cmd_exec('mv $c_file $git_repo_dir_vc/$c_file')
// add new .c file to local vc repo
gen_vc.cmd_exec('git -C $git_repo_dir_vc add $c_file')
}
// check if the vc repo actually changed
git_status := gen_vc.cmd_exec('git -C $git_repo_dir_vc status')
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if git_status.contains('nothing to commit') {
gen_vc.logger.error('no changes to vc repo: something went wrong.')
gen_vc.gen_error = true
}
// commit changes to local vc repo
gen_vc.cmd_exec_safe('git -C $git_repo_dir_vc commit -m "[v:master] $last_commit_hash_v_short - $last_commit_subject"')
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// push changes to remote vc repo
gen_vc.cmd_exec_safe('git -C $git_repo_dir_vc push https://${urllib.query_escape(git_username)}:${urllib.query_escape(git_password)}@$git_repo_vc master')
}
// only execute when dry_run option is false, otherwise just log
fn (gen_vc mut GenVC) cmd_exec_safe(cmd string) string {
return gen_vc.command_execute(cmd, gen_vc.options.dry_run)
}
// always execute command
fn (gen_vc mut GenVC) cmd_exec(cmd string) string {
return gen_vc.command_execute(cmd, false)
}
// execute command
fn (gen_vc mut GenVC) command_execute(cmd string, dry bool) string {
// if dry is true then dont execute, just log
if dry {
return gen_vc.command_execute_dry(cmd)
}
gen_vc.logger.info('cmd: $cmd')
r := os.exec(cmd) or {
gen_vc.logger.error('$err_msg_cmd_x: "$cmd" could not start.')
gen_vc.logger.error( err )
// something went wrong, better start fresh next time
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gen_vc.purge_repos()
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gen_vc.gen_error = true
return ''
}
if r.exit_code != 0 {
gen_vc.logger.error('$err_msg_cmd_x: "$cmd" failed.')
gen_vc.logger.error(r.output)
// something went wrong, better start fresh next time
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gen_vc.purge_repos()
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gen_vc.gen_error = true
return ''
}
return r.output
}
// just log cmd, dont execute
fn (gen_vc mut GenVC) command_execute_dry(cmd string) string {
gen_vc.logger.info('cmd (dry): "$cmd"')
return ''
}
// delete repo directories
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fn (gen_vc mut GenVC) purge_repos() {
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// delete old repos (better to be fully explicit here, since these are destructive operations)
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mut repo_dir := '$gen_vc.options.work_dir/$git_repo_dir_v'
if os.is_dir(repo_dir) {
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gen_vc.logger.info('purging local repo: "$repo_dir"')
gen_vc.cmd_exec('rm -rf $repo_dir')
}
repo_dir = '$gen_vc.options.work_dir/$git_repo_dir_vc'
if os.is_dir(repo_dir) {
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gen_vc.logger.info('purging local repo: "$repo_dir"')
gen_vc.cmd_exec('rm -rf $repo_dir')
}
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}
// check if file size is too short
fn (gen_vc mut GenVC) assert_file_exists_and_is_not_too_short(f string, emsg string){
if !os.exists(f) {
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gen_vc.logger.error('$err_msg_build: $emsg .')
gen_vc.gen_error = true
return
}
fsize := os.file_size(f)
if fsize < too_short_file_limit {
gen_vc.logger.error('$err_msg_build: $f exists, but is too short: only $fsize bytes.')
gen_vc.gen_error = true
return
}
}