tools: add support for vgit-fmt-hook on OpenBSD

[lcheylus]

On OpenBSD env -S is not supported => cmd/tools/git_pre_commit_hook.vsh cannot be used as pre-commit git hook.

Generate an equivalent shell script to run cmd/tools/git_pre_commit_hook.vsh file => exec it via v run then copy temporary generated shell script in .git/hook/pre-commit

Fix #26344

• Also add fix to not install pre-commit Git hook if already the same than the original version (VSH or shell script) (command ./v git-fmt-hook install)

Thanks to @spytheman for his help and see PR #26374 for previous discussions.

---

Tests OK on OpenBSD for status / install / remove with vgit-fmt-hook

$ ./v git-fmt-hook status
>   CURRENT git repo pre-commit hook: missing /home/fox/dev/vlang.git/.git/hooks/pre-commit
> Main V repo pre-commit hook script: size:     73 bytes, sha256: 33fd97a1602eafa9091f9378ac5e04213f5ae9a45d752c08326f2e8586bd6eeb, /tmp/v_1000/git_pre_commit_hook.sh
> Files have different hashes.
> Use `v git-fmt-hook install` to update the CURRENT repository's pre-commit hook,
> with the newest pre-commit formatting script from the main V repo.

$ ./v git-fmt-hook install
>   CURRENT git repo pre-commit hook: missing /home/fox/dev/vlang.git/.git/hooks/pre-commit
> Main V repo pre-commit hook script: size:     73 bytes, sha256: 33fd97a1602eafa9091f9378ac5e04213f5ae9a45d752c08326f2e8586bd6eeb, /tmp/v_1000/git_pre_commit_hook.sh
> Files have different hashes.
> Installing the newest version of /home/fox/dev/vlang.git/cmd/tools/git_pre_commit_hook.vsh over /home/fox/dev/vlang.git/.git/hooks/pre-commit ...
> Done.
$  ./v git-fmt-hook install
>   CURRENT git repo pre-commit hook: size:     73 bytes, sha256: 33fd97a1602eafa9091f9378ac5e04213f5ae9a45d752c08326f2e8586bd6eeb, /home/fox/dev/vlang.git/.git/hooks/pre-commit
> Main V repo pre-commit hook script: size:     73 bytes, sha256: 33fd97a1602eafa9091f9378ac5e04213f5ae9a45d752c08326f2e8586bd6eeb, /tmp/v_1000/git_pre_commit_hook.sh
> Both files are exactly the same.

./v git-fmt-hook remove
>   CURRENT git repo pre-commit hook: size:     73 bytes, sha256: 33fd97a1602eafa9091f9378ac5e04213f5ae9a45d752c08326f2e8586bd6eeb, /home/fox/dev/vlang.git/.git/hooks/pre-commit
> Main V repo pre-commit hook script: size:     73 bytes, sha256: 33fd97a1602eafa9091f9378ac5e04213f5ae9a45d752c08326f2e8586bd6eeb, /tmp/v_1000/git_pre_commit_hook.sh
> Both files are exactly the same.
> Removing /home/fox/dev/vlang.git/.git/hooks/pre-commit ...
> Done.

pre-commit Git hook works as attended on OpenBSD when commiting V files with bad format.

• Update tests for vgit-fmt-hook

$ ---- Testing... ----
        V  source  code size:      31733 lines,     145986 tokens,     864126 bytes,   322 types,    13 modules,   150 files
generated  target  code size:      11608 lines,     445294 bytes
compilation took: 639.449 ms, compilation speed: 49625 vlines/s, cgen threads: 3
running tests in: /home/fox/dev/vlang.git/cmd/tools/vgit-fmt-hook_test.v
>>>>>> preparing tfolder: /tmp/v_1000/tsession_22e0fca70_01KF95440J5SZ4SQ68EK347P35/fmt_hook_test
      OK    [1/9]   127.790 ms     3 asserts | main.testsuite_begin()
>>>> test_commit_no_vfmt
      OK    [2/9]    87.661 ms     6 asserts | main.test_commit_no_vfmt()
>>>> test_run_vfmt_manually
      OK    [3/9]   112.881 ms     7 asserts | main.test_run_vfmt_manually()
>>>> test_run_git_fmt_hook
      OK    [4/9]    28.258 ms     7 asserts | main.test_run_git_fmt_hook()
>>>> test_run_git_fmt_hook_status_explicit
      OK    [5/9]    65.794 ms     7 asserts | main.test_run_git_fmt_hook_status_explicit()
>>>> test_run_git_fmt_hook_install
      OK    [6/9]   879.745 ms    18 asserts | main.test_run_git_fmt_hook_install()
>>>> test_run_git_fmt_hook_remove
      OK    [7/9]   158.407 ms     7 asserts | main.test_run_git_fmt_hook_remove()
>>>> test_run_git_fmt_hook_install_and_remove_on_foreign_hook_should_be_a_nop
      OK    [8/9]   553.434 ms    16 asserts | main.test_run_git_fmt_hook_install_and_remove_on_foreign_hook_should_be_a_nop()
* commit 719ea573fa670b1e095733983fd77ed0bcfddf11 (install_and_remove_should_be_a_nop_on_a_foreign_hook)
| Author: Myself <me@example.com>
| Date:   Sun Jan 18 19:15:54 2026 +0100
|
|     this should NOT be formatted 2
|
| * commit 1c7114d48714cb744ee4afc3528329e754fbc22a (non_formatting_after_removing_hook)
|/  Author: Myself <me@example.com>
|   Date:   Sun Jan 18 19:15:54 2026 +0100
|
|       this should NOT be formatted again
|
| * commit ca13b484fb2c46cc797cd8399b01994687b8dc80 (formatted)
|/  Author: Myself <me@example.com>
|   Date:   Sun Jan 18 19:15:53 2026 +0100
|
|       formatted change
|
| * commit b961bc5d1ea54a6604bde31d5c64e7459de5874c (formatting_with_hook)
|/  Author: Myself <me@example.com>
|   Date:   Sun Jan 18 19:15:53 2026 +0100
|
|       this should be formatted
|
| * commit 9e025830c620248e4bc7374eac3f7195925587fc (unformatted)
|/  Author: Myself <me@example.com>
|   Date:   Sun Jan 18 19:15:52 2026 +0100
|
|       unformatted change
|
* commit f1134fd802b5cfe4ace6210fcd5f153f029aaba1 (HEAD -> start, master)
  Author: Myself <me@example.com>
  Date:   Sun Jan 18 19:15:52 2026 +0100

      start testing, initially unformatted
On branch start
nothing to commit, working tree clean
>>>>>> deleted /tmp/v_1000/tsession_22e0fca70_01KF95440J5SZ4SQ68EK347P35/fmt_hook_test . Use VTEST_KEEP_TFOLDER=1 to keep it to ease diagnosing platform issues.
      OK    [9/9]    68.670 ms     2 asserts | main.testsuite_end()
     Summary for running V tests in "vgit-fmt-hook_test.v": 73 passed, 73 total. Elapsed time: 2083 ms.

 OK    2793.188 ms cmd/tools/vgit-fmt-hook_test.v
----

With this fix, all self tests OK on OpenBSD for cmd/

$ ./v test-self cmd
---- testing: cmd ----
 OK    [ 1/25] C:   745.0 ms, R:  1162.800 ms cmd/tools/vbump_test.v
 OK    [ 2/25] C:   739.7 ms, R:  1451.023 ms cmd/tools/vcomplete_test.v
 OK    [ 3/25] C:   762.8 ms, R:     6.423 ms cmd/tools/vcreate/vcreate_init_test.v
 OK    [ 4/25] C:   780.9 ms, R:     5.991 ms cmd/tools/vcreate/vcreate_new_test.v
 OK    [ 5/25] C:   754.0 ms, R:  4352.684 ms cmd/tools/vcover/cover_test.v
 OK    [ 6/25] C:  3189.3 ms, R:    11.830 ms cmd/tools/vdoc/document/doc_private_fn_test.v
 OK    [ 7/25] C:  3789.0 ms, R:    99.690 ms cmd/tools/vdoc/document/doc_test.v
 OK    [ 8/25] C:   950.0 ms, R:  5196.406 ms cmd/tools/vdoc/vdoc_file_test.v
 OK    [ 9/25] C:  4498.8 ms, R:    76.193 ms cmd/tools/vdoc/vdoc_test.v
 OK    [10/25] C:  1094.1 ms, R:     9.843 ms cmd/tools/vpm/dependency_test.v
 OK    [11/25] C:   898.7 ms, R:  5920.660 ms cmd/tools/vdoc/vdoc_run_examples_test.v
 OK    [12/25] C:   977.3 ms, R:    10.691 ms cmd/tools/vpm/install_version_input_test.v
 OK    [13/25] C:   907.0 ms, R:  2645.469 ms cmd/tools/vgit-fmt-hook_test.v
 OK    [14/25] C:  8740.1 ms, R:    20.826 ms cmd/tools/vpm/install_test.v
 OK    [15/25] C:  6497.6 ms, R:    25.715 ms cmd/tools/vpm/outdated_test.v
 OK    [16/25] C:  7636.4 ms, R:    26.857 ms cmd/tools/vpm/install_version_test.v
 OK    [17/25] C:  1035.7 ms, R:     6.727 ms cmd/tools/vpm/remove_test.v
 OK    [18/25] C:  1004.9 ms, R:     7.688 ms cmd/tools/vpm/update_test.v
 OK    [19/25] C:  1662.5 ms, R:    16.467 ms cmd/tools/vpm/search_test.v
 OK    [20/25] C:  1591.4 ms, R:    16.294 ms cmd/tools/vpm/vcs_test.v
 OK    [21/25] C:   796.9 ms, R:    32.047 ms cmd/tools/vtimeout_test.v
 OK    [22/25] C:   931.1 ms, R:  3223.989 ms cmd/tools/vvet/vet_test.v
 OK    [23/25] C:   911.5 ms, R:  5692.915 ms cmd/tools/vretry_test.v
 OK    [24/25] C:   816.9 ms, R:  5719.786 ms cmd/tools/vtest_test.v
 OK    [25/25] C:   896.8 ms, R:    13.784 ms cmd/tools/vwhere/vwhere_test.v
----
Summary for testing: cmd: 25 passed, 25 total. Elapsed time: 29943 ms, on 3 parallel jobs. Comptime: 52608 ms. Runtime: 35752 ms.

[spytheman]

Thank you @lcheylus 🙇🏻 .