113 lines
4.1 KiB
V
113 lines
4.1 KiB
V
import os
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import flag
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import scripting
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import vgit
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const (
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tool_version = '0.0.3'
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tool_description = ' Checkout an old V and compile it as it was on specific commit.
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This tool is useful, when you want to discover when something broke.
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It is also useful, when you just want to experiment with an older historic V.
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The VCOMMIT argument can be a git commitish like HEAD or master and so on.
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When oldv is used with git bisect, you probably want to give HEAD. For example:
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git bisect start
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git bisect bad
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git checkout known_good_commit
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git bisect good
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## Now git will automatically checkout a middle commit between the bad and the good
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cmd/tools/oldv HEAD --command="run commands in oldv folder, to verify if the commit is good or bad"
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## See what the result is, and either do: ...
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git bisect good
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## ... or do:
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git bisect bad
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## Now you just repeat the above steps, each time running oldv with the same command, then mark the result as good or bad,
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## until you find the commit, where the problem first occurred.
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## When you finish, do not forget to do:
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git bisect reset'
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)
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struct Context {
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mut:
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vgo vgit.VGitOptions
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commit_v string='master' // the commit from which you want to produce a working v compiler (this may be a commit-ish too)
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commit_vc string='master' // this will be derived from commit_v
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commit_v_hash string // this will be filled from the commit-ish commit_v using rev-list. It IS a commit hash.
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path_v string // the full path to the v folder inside workdir.
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path_vc string // the full path to the vc folder inside workdir.
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cmd_to_run string // the command that you want to run *in* the oldv repo
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cc string='cc' // the C compiler to use for bootstrapping.
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cleanup bool // should the tool run a cleanup first
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}
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fn (mut c Context) compile_oldv_if_needed() {
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mut vgit_context := vgit.VGitContext{
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workdir: c.vgo.workdir
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v_repo_url: c.vgo.v_repo_url
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vc_repo_url: c.vgo.vc_repo_url
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cc: c.cc
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commit_v: c.commit_v
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path_v: c.path_v
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path_vc: c.path_vc
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}
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vgit_context.compile_oldv_if_needed()
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c.commit_v_hash = vgit_context.commit_v__hash
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if !os.exists(vgit_context.vexepath) && c.cmd_to_run.len > 0 {
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// NB: 125 is a special code, that git bisect understands as 'skip this commit'.
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// it is used to inform git bisect that the current commit leads to a build failure.
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exit(125)
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}
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}
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fn main() {
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scripting.used_tools_must_exist(['git', 'cc'])
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mut context := Context{}
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mut fp := flag.new_flag_parser(os.args)
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fp.application(os.file_name(os.executable()))
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fp.version(tool_version)
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fp.description(tool_description)
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fp.arguments_description('VCOMMIT')
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fp.skip_executable()
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fp.limit_free_args(1, 1)
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context.cleanup = fp.bool('clean', 0, true, 'Clean before running (slower).')
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context.cmd_to_run = fp.string('command', `c`, '', 'Command to run in the old V repo.\n')
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commits := vgit.add_common_tool_options(mut context.vgo, mut fp)
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if commits.len > 0 {
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context.commit_v = commits[0]
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} else {
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context.commit_v = scripting.run('git rev-list -n1 HEAD')
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}
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println('################# context.commit_v: $context.commit_v #####################')
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context.path_v = vgit.normalized_workpath_for_commit(context.vgo.workdir, context.commit_v)
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context.path_vc = vgit.normalized_workpath_for_commit(context.vgo.workdir, 'vc')
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if !os.is_dir(context.vgo.workdir) {
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eprintln('Work folder: ${context.vgo.workdir} , does not exist.')
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exit(2)
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}
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ecc := os.getenv('CC')
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if ecc != '' {
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context.cc = ecc
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}
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if context.cleanup {
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scripting.rmrf(context.path_v)
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scripting.rmrf(context.path_vc)
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}
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context.compile_oldv_if_needed()
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scripting.chdir(context.path_v)
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println('# v commit hash: $context.commit_v_hash')
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println('# checkout folder: $context.path_v')
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if context.cmd_to_run.len > 0 {
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cmdres := os.exec(context.cmd_to_run) or {
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panic(err)
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}
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println('# command: ${context.cmd_to_run:-34s} exit code: ${cmdres.exit_code:-4d} result:')
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println(cmdres.output)
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exit(cmdres.exit_code)
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}
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}
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