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) if !cmdres.output.ends_with('\n') { println('') } exit(cmdres.exit_code) } }