From 858de42a2bd6d3ef527a9716f193edab47292bdf Mon Sep 17 00:00:00 2001
From: Simon Cruanes <simon.cruanes.2007@m4x.org>
Date: Thu, 12 Mar 2026 20:49:35 -0400
Subject: [PATCH] revert to just dune-build-info

---
 .gitignore                    |  3 ---
 dune-project                  |  3 ++-
 opentelemetry.opam            |  1 +
 src/lib/dune                  | 24 +-----------------------
 src/lib/gen_git_index_path.sh |  2 --
 src/lib/gen_version.sh        |  6 ------
 src/lib/globals.ml            |  2 +-
 src/lib/version.ml            |  4 ++++
 src/lib/version.mli           |  7 +------
 9 files changed, 10 insertions(+), 42 deletions(-)
 delete mode 100644 src/lib/gen_git_index_path.sh
 delete mode 100644 src/lib/gen_version.sh
 create mode 100644 src/lib/version.ml

diff --git a/.gitignore b/.gitignore
index e109d796..85d4d798 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,3 @@ _opam
 *.install
 *.exe
 *.tmp
-src/lib/version.ml
-src/lib/.git_index_path
-src/lib/.git_index.lnk
diff --git a/dune-project b/dune-project
index e0f924ee..4f3cbf9d 100644
--- a/dune-project
+++ b/dune-project
@@ -49,7 +49,8 @@
     (>= 0.27)
     (< 0.28)))
   (mtime
-   (>= "1.4")))
+   (>= "1.4"))
+  dune-build-info)
  (depopts atomic trace thread-local-storage lwt eio picos)
  (conflicts
   (trace
diff --git a/opentelemetry.opam b/opentelemetry.opam
index 962fd3e5..cbe391fd 100644
--- a/opentelemetry.opam
+++ b/opentelemetry.opam
@@ -26,6 +26,7 @@ depends: [
   "ocaml-lsp-server" {with-dev-setup}
   "ocamlformat" {with-dev-setup & >= "0.27" & < "0.28"}
   "mtime" {>= "1.4"}
+  "dune-build-info"
 ]
 depopts: ["atomic" "trace" "thread-local-storage" "lwt" "eio" "picos"]
 conflicts: [
diff --git a/src/lib/dune b/src/lib/dune
index 1e6aff4a..5ac62e76 100644
--- a/src/lib/dune
+++ b/src/lib/dune
@@ -1,26 +1,3 @@
-(rule
- (target .git_index_path)
- (deps (universe) gen_git_index_path.sh)
- (action
-  (with-stdout-to
-   .git_index_path
-   (run sh gen_git_index_path.sh))))
-
-(rule
- (target .git_index.lnk)
- (action
-  (run ln -sf %{read-lines:.git_index_path} %{target})))
-
-(rule
- (target version.ml)
- (deps
-  (file .git_index.lnk)
-  gen_version.sh)
- (action
-  (with-stdout-to
-   version.ml
-   (run sh gen_version.sh))))
-
 (library
  (name opentelemetry)
  (public_name opentelemetry)
@@ -44,6 +21,7 @@
   (re_export opentelemetry.ambient-context)
   (re_export opentelemetry.atomic)
   (re_export hmap)
+  dune-build-info
   mtime
   mtime.clock.os
   pbrt
diff --git a/src/lib/gen_git_index_path.sh b/src/lib/gen_git_index_path.sh
deleted file mode 100644
index 899fbc6c..00000000
--- a/src/lib/gen_git_index_path.sh
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/bin/sh
-git rev-parse --git-path index 2>/dev/null || echo /dev/null
diff --git a/src/lib/gen_version.sh b/src/lib/gen_version.sh
deleted file mode 100644
index aecb43eb..00000000
--- a/src/lib/gen_version.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/bin/sh
-v=$(git describe --exact-match HEAD 2>/dev/null | sed 's/^v//')
-[ -z "$v" ] && v=dev
-h=$(git rev-parse HEAD 2>/dev/null)
-[ -z "$h" ] && h=unknown
-printf 'let version = "%s"\nlet git_hash = "%s"\n' "$v" "$h"
diff --git a/src/lib/globals.ml b/src/lib/globals.ml
index 0c4bc3a3..ab190703 100644
--- a/src/lib/globals.ml
+++ b/src/lib/globals.ml
@@ -21,7 +21,7 @@ let service_instance_id = ref None
 let service_version = ref None
 
 (** @since NEXT_RELEASE *)
-let sdk_version : string = Version.(spf "%s at %s" version git_hash)
+let sdk_version : string = Version.version
 
 let instrumentation_library =
   make_instrumentation_scope ~version:sdk_version ~name:"opentelemetry" ()
diff --git a/src/lib/version.ml b/src/lib/version.ml
new file mode 100644
index 00000000..a037540d
--- /dev/null
+++ b/src/lib/version.ml
@@ -0,0 +1,4 @@
+let version =
+  match Build_info.V1.version () with
+  | None -> "dev"
+  | Some v -> Build_info.V1.Version.to_string v
diff --git a/src/lib/version.mli b/src/lib/version.mli
index 050c8dad..64fe6591 100644
--- a/src/lib/version.mli
+++ b/src/lib/version.mli
@@ -1,7 +1,2 @@
 val version : string
-(** Version of the library, e.g. ["0.12"]. ["dev"] if not built from a release
-    tag. *)
-
-val git_hash : string
-(** Full git commit hash at build time, e.g. ["b92159c1..."]. ["unknown"] if git
-    was unavailable. *)
+(** Version of the library, e.g. ["0.12"]. ["dev"] if not built from a release. *)