From 28c596320f48e4606f8eaf69fdc1c83fb084749e Mon Sep 17 00:00:00 2001
From: Nicholas Vollmer <iarchivedmywholelife@gmail.com>
Date: Sun, 15 Jan 2023 14:55:11 -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 | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/mk/targets.mk b/mk/targets.mk
index 4435daa91..300fc8e0b 100644
--- a/mk/targets.mk
+++ b/mk/targets.mk
@@ -14,7 +14,14 @@ 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 echo $(firstword $(REMOTETAGS)) | cut -c 1-6)
+    TAGPREFIX  := $(subst refs/tags/,,$(lastword $(REMOTETAGS)))
+    GITVERSION ?= $(subst ^{},-n/a-g$(COMMIT),$(TAGPREFIX))
+  else
+    GITVERSION ?= $(shell git describe --match release\* --abbrev=6 HEAD)
+  endif
   GITSTATUS  ?= $(shell git status -uno --porcelain)
 else
  -include mk/version.mk
-- 
2.39.0