From 85990610ca7572f5a6ff7604d957efdf00747094 Mon Sep 17 00:00:00 2001
From: Nicholas Vollmer <iarchivedmywholelife@gmail.com>
Date: Mon, 16 Jan 2023 14:00:41 -0500
Subject: [PATCH] * mk/targets.mk (GITVERSION): support shallow repo clones

If Org is being built from a shallow clone, tags are not locally available.
Query the upstream remote via git ls-remote and parse the output.
Note this will result in a "n/a" indicator in org-version where the
number of commits since the last tag is usually present.
e.g. "release_9.6.1-n/a-gabc123"
---
 mk/targets.mk | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/mk/targets.mk b/mk/targets.mk
index 4435daa9..be79a127 100644
--- a/mk/targets.mk
+++ b/mk/targets.mk
@@ -14,7 +14,20 @@ ifneq ($(wildcard .git),)
   # Use the org.el header.
   ORGVERSION := $(patsubst %-dev,%,$(shell $(BATCH) --eval "(require 'lisp-mnt)" \
     --visit lisp/org.el --eval '(princ (lm-header "version"))'))
-  GITVERSION ?= $(shell git describe --match release\* --abbrev=6 HEAD)
+  ifneq ($(wildcard .git/shallow),)
+    REMOTETAGS := $(strip $(shell git ls-remote --tags 2>/dev/null | tail -n 1))
+    COMMIT     := $(shell git rev-parse --short=6 HEAD)
+    TAG        := $(lastword $(REMOTETAGS))
+    ifneq ($(TAG),)
+      TAGPREFIX  := $(subst refs/tags/,,$(TAG))
+      GITVERSION ?= $(subst ^{},-n/a-g$(COMMIT), $(TAGPREFIX))
+    else
+      GITVERSION ?= $(ORGVERSION)-n/a-g$(COMMIT)
+    endif
+  else
+    GITVERSION ?= $(shell git describe --match release\* --abbrev=6 HEAD)
+  endif
+  GITVERSION ?= N/A
   GITSTATUS  ?= $(shell git status -uno --porcelain)
 else
  -include mk/version.mk
-- 
2.39.0