From 947c92ce3f9f4fa16957648899a4088954d5bf5c Mon Sep 17 00:00:00 2001
From: javalsai <jvssxxi@gmail.com>
Date: Mon, 21 Jul 2025 18:30:28 +0200
Subject: [PATCH] build: allow to override git-rev and timestamp build info

---
 Makefile          |  9 +++++----
 docs/PACKAGERS.md | 11 +++++++++++
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index 7b48488..59f8799 100644
--- a/Makefile
+++ b/Makefile
@@ -22,14 +22,15 @@ DEPS = $(patsubst %,$(IDIR)/%,$(_DEPS))
 _OBJ = main.o log.o util.o ui.o ui_state.o config.o desktop.o auth.o ofield.o efield.o users.o sessions.o chvt.o launch_state.o
 OBJ = $(patsubst %,$(ODIR)/%,$(_OBJ))
 
-.git/HEAD:
+INFO_GIT_REV?=$$(git describe --long --tags --always || echo '?')
+INFO_BUILD_TS?=$$(date +%s)
 
-$(IDIR)/version.h: Makefile .git/HEAD
+$(IDIR)/version.h: Makefile
 	@tmp=$$(mktemp); \
 	printf '' > $$tmp; \
 	echo '#define LIDM_VERSION "'$(VERSION)'"' >> $$tmp; \
-	echo '#define LIDM_GIT_REV "'$$(git describe --long --tags --always || echo '?')'"' >> $$tmp; \
-	echo '#define LIDM_BUILD_TS '$$(date +%s) >> $$tmp; \
+	echo '#define LIDM_GIT_REV "'$(INFO_GIT_REV)'"' >> $$tmp; \
+	echo '#define LIDM_BUILD_TS '$(INFO_BUILD_TS) >> $$tmp; \
 	if ! cmp -s $$tmp $@; then \
 		mv $$tmp $@; \
 	fi; \
diff --git a/docs/PACKAGERS.md b/docs/PACKAGERS.md
index a94d835..5e41e2b 100644
--- a/docs/PACKAGERS.md
+++ b/docs/PACKAGERS.md
@@ -38,6 +38,17 @@ Lidm attempts to support being built by `gcc` and `clang` with preference over t
 
 Compiler flags should be passed with `CFLAGS`, its `-O3 -Wall` by default so adding anything will overwrite this.
 
+## Build Metadata
+
+`lidm -v` outputs some information about the build version, this can be weaked with `INFO_GIT_REV` and `INFO_BUILD_TS`, by default they are:
+
+```make
+INFO_GIT_REV?=$$(git describe --long --tags --always || echo '?')
+INFO_BUILD_TS?=$$(date +%s)
+```
+
+But this can be changed by just passing those env variables, for example, in the case git is not applicable in the build environment of the package.
+
 ## Target Directory
 
 `DESTDIR` can be used to for installation recipes to install on alternative root directories. Along with `PREFIX` (defaults to `/usr`) for systems which don't use the common `/usr` structure. e.g. `make install DESTDIR=$out PREFIX=`