From d1ebc56bfee34bee4095758b2a529e29a796d719 Mon Sep 17 00:00:00 2001
From: Caleb Maclennan <caleb@alerque.com>
Date: Thu, 30 May 2024 16:59:46 +0300
Subject: [PATCH] Allow builds from 'git archive' generated tarballs (#2187)

Co-authored-by: extrawurst <776816+extrawurst@users.noreply.github.com>
---
 CHANGELOG.md | 3 +++
 build.rs     | 7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b723485..8216cbd8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,9 @@ but this also allows us now to define colors in the common hex format:
 
 Checkout [THEMES.md](./THEMES.md) for more info.
 
+### Added
+* support `TAR_COMMIT_ID` enabling builds from `git archive` generated source tarballs or other outside a git repo [[@alerque](https://github.com/alerque)] ([#2187](https://github.com/extrawurst/gitui/pull/2187))
+
 ### Fixes
 * update yanked dependency to `libc` to fix building with `--locked`.
 * document breaking change in theme file format.
diff --git a/build.rs b/build.rs
index e217973c..2434db6a 100644
--- a/build.rs
+++ b/build.rs
@@ -3,9 +3,14 @@ use chrono::TimeZone;
 fn get_git_hash() -> String {
 	use std::process::Command;
 
+	// Allow builds from `git archive` generated tarballs if output of `git get-tar-commit-id` is
+	// set in an env var.
+	if let Ok(commit) = std::env::var("TAR_COMMIT_ID") {
+		return commit[..7].to_string();
+	};
 	let commit = Command::new("git")
 		.arg("rev-parse")
-		.arg("--short")
+		.arg("--short=7")
 		.arg("--verify")
 		.arg("HEAD")
 		.output();