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|
import os
import flag
import scripting
import vgit
const (
tool_version = '0.0.3'
tool_description = ' Checkout an old V and compile it as it was on specific commit.
| This tool is useful, when you want to discover when something broke.
| It is also useful, when you just want to experiment with an older historic V.
|
| The VCOMMIT argument can be a git commitish like HEAD or master and so on.
| When oldv is used with git bisect, you probably want to give HEAD. For example:
| git bisect start
| git bisect bad
| git checkout known_good_commit
| git bisect good
| ## Now git will automatically checkout a middle commit between the bad and the good
| cmd/tools/oldv HEAD --command="run commands in oldv folder, to verify if the commit is good or bad"
| ## See what the result is, and either do: ...
| git bisect good
| ## ... or do:
| git bisect bad
| ## Now you just repeat the above steps, each time running oldv with the same command, then mark the result as good or bad,
| ## until you find the commit, where the problem first occurred.
| ## When you finish, do not forget to do:
| git bisect reset'.strip_margin()
)
struct Context {
mut:
vgo vgit.VGitOptions
vgcontext vgit.VGitContext
commit_v string = 'master' // the commit from which you want to produce a working v compiler (this may be a commit-ish too)
commit_v_hash string // this will be filled from the commit-ish commit_v using rev-list. It IS a commit hash.
path_v string // the full path to the v folder inside workdir.
path_vc string // the full path to the vc folder inside workdir.
cmd_to_run string // the command that you want to run *in* the oldv repo
cc string = 'cc' // the C compiler to use for bootstrapping.
cleanup bool // should the tool run a cleanup first
use_cache bool // use local cached copies for --vrepo and --vcrepo in
fresh_tcc bool // do use `make fresh_tcc`
}
fn (mut c Context) compile_oldv_if_needed() {
c.vgcontext = vgit.VGitContext{
workdir: c.vgo.workdir
v_repo_url: c.vgo.v_repo_url
vc_repo_url: c.vgo.vc_repo_url
cc: c.cc
commit_v: c.commit_v
path_v: c.path_v
path_vc: c.path_vc
make_fresh_tcc: c.fresh_tcc
}
c.vgcontext.compile_oldv_if_needed()
c.commit_v_hash = c.vgcontext.commit_v__hash
if !os.exists(c.vgcontext.vexepath) && c.cmd_to_run.len > 0 {
// NB: 125 is a special code, that git bisect understands as 'skip this commit'.
// it is used to inform git bisect that the current commit leads to a build failure.
exit(125)
}
}
const cache_oldv_folder = os.join_path(os.cache_dir(), 'oldv')
const cache_oldv_folder_v = os.join_path(cache_oldv_folder, 'v')
const cache_oldv_folder_vc = os.join_path(cache_oldv_folder, 'vc')
fn sync_cache() {
scripting.verbose_trace(@FN, 'start')
if !os.exists(cache_oldv_folder) {
scripting.verbose_trace(@FN, 'creating $cache_oldv_folder')
scripting.mkdir_all(cache_oldv_folder) or {
scripting.verbose_trace(@FN, '## failed.')
exit(1)
}
}
scripting.chdir(cache_oldv_folder)
for reponame in ['v', 'vc'] {
repofolder := os.join_path(cache_oldv_folder, reponame)
if !os.exists(repofolder) {
scripting.verbose_trace(@FN, 'cloning to $repofolder')
scripting.exec('git clone --quiet https://github.com/vlang/$reponame $repofolder') or {
scripting.verbose_trace(@FN, '## error during clone: $err')
exit(1)
}
}
scripting.chdir(repofolder)
scripting.exec('git pull --quiet') or {
scripting.verbose_trace(@FN, 'pulling to $repofolder')
scripting.verbose_trace(@FN, '## error during pull: $err')
exit(1)
}
}
scripting.verbose_trace(@FN, 'done')
}
fn main() {
scripting.used_tools_must_exist(['git', 'cc'])
//
// Resetting VEXE here allows for `v run cmd/tools/oldv.v'.
// the parent V would have set VEXE, which later will
// affect the V's run from the tool itself.
os.setenv('VEXE', '', true)
//
mut context := Context{}
context.vgo.workdir = cache_oldv_folder
mut fp := flag.new_flag_parser(os.args)
fp.application(os.file_name(os.executable()))
fp.version(tool_version)
fp.description(tool_description)
fp.arguments_description('VCOMMIT')
fp.skip_executable()
context.use_cache = fp.bool('cache', `u`, true, 'Use a cache of local repositories for --vrepo and --vcrepo in \$HOME/.cache/oldv/')
if context.use_cache {
context.vgo.v_repo_url = cache_oldv_folder_v
context.vgo.vc_repo_url = cache_oldv_folder_vc
} else {
context.vgo.v_repo_url = 'https://github.com/vlang/v'
context.vgo.vc_repo_url = 'https://github.com/vlang/vc'
}
should_sync := fp.bool('cache-sync', `s`, false, 'Update the local cache')
if !should_sync {
fp.limit_free_args(1, 1)
}
////
context.cleanup = fp.bool('clean', 0, false, 'Clean before running (slower).')
context.fresh_tcc = fp.bool('fresh_tcc', 0, true, 'Do `make fresh_tcc` when preparing a V compiler.')
context.cmd_to_run = fp.string('command', `c`, '', 'Command to run in the old V repo.\n')
commits := vgit.add_common_tool_options(mut context.vgo, mut fp)
if should_sync {
sync_cache()
exit(0)
}
if context.use_cache {
if !os.is_dir(cache_oldv_folder_v) || !os.is_dir(cache_oldv_folder_vc) {
sync_cache()
}
}
if commits.len > 0 {
context.commit_v = commits[0]
} else {
context.commit_v = scripting.run('git rev-list -n1 HEAD')
}
scripting.cprintln('################# context.commit_v: $context.commit_v #####################')
context.path_v = vgit.normalized_workpath_for_commit(context.vgo.workdir, context.commit_v)
context.path_vc = vgit.normalized_workpath_for_commit(context.vgo.workdir, 'vc')
if !os.is_dir(context.vgo.workdir) {
eprintln('Work folder: $context.vgo.workdir , does not exist.')
exit(2)
}
ecc := os.getenv('CC')
if ecc != '' {
context.cc = ecc
}
if context.cleanup {
scripting.rmrf(context.path_v)
scripting.rmrf(context.path_vc)
}
context.compile_oldv_if_needed()
scripting.chdir(context.path_v)
shorter_hash := context.commit_v_hash[0..10]
scripting.cprintln('# v commit hash: $shorter_hash | folder: $context.path_v')
if context.cmd_to_run.len > 0 {
scripting.cprintln_strong('# command: ${context.cmd_to_run:-34s}')
cmdres := os.execute_or_exit(context.cmd_to_run)
if cmdres.exit_code != 0 {
scripting.cprintln_strong('# exit code: ${cmdres.exit_code:-4d}')
}
scripting.cprint_strong('# result: ')
print(cmdres.output)
exit(cmdres.exit_code)
}
}
|
