From 5bc81e3a304369505b5a0b5f649995d039884681 Mon Sep 17 00:00:00 2001
From: Arsen Musayelyan <moussaelianarsen@gmail.com>
Date: Mon, 21 Nov 2022 21:03:56 -0800
Subject: [PATCH] Add DISTRO_ID_LIKE environment variable

---
 build.go              | 5 +++++
 docs/build-scripts.md | 6 ++++++
 2 files changed, 11 insertions(+)

diff --git a/build.go b/build.go
index b941136..b23ae55 100644
--- a/build.go
+++ b/build.go
@@ -22,6 +22,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/hex"
+	"fmt"
 	"io"
 	"os"
 	"path/filepath"
@@ -122,6 +123,9 @@ func buildPackage(ctx context.Context, script string, mgr manager.Manager) ([]st
 	var distroChanged bool
 	if distID, ok := os.LookupEnv("LURE_DISTRO"); ok {
 		info.ID = distID
+		// Since the distro was overwritten, we don't know what the
+		// like distros are, so set to nil
+		info.Like = nil
 		distroChanged = true
 	}
 
@@ -479,6 +483,7 @@ func genBuildEnv(info *distro.OSRelease) []string {
 		"DISTRO_PRETTY_NAME="+info.PrettyName,
 		"DISTRO_ID="+info.ID,
 		"DISTRO_VERSION_ID="+info.VersionID,
+		"DISTRO_ID_LIKE="+strings.Join(info.Like, " "),
 
 		"ARCH="+arch,
 		"NCPU="+strconv.Itoa(runtime.NumCPU()),
diff --git a/docs/build-scripts.md b/docs/build-scripts.md
index 75a63cc..f51f74b 100644
--- a/docs/build-scripts.md
+++ b/docs/build-scripts.md
@@ -301,6 +301,12 @@ The `DISTRO_ID` variable is the identifier of the distro as defined in its `os-r
 
 For example, it's set to `fedora` in a Fedora 36 docker image
 
+### DISTRO_ID_LIKE
+
+The `DISTRO_ID_LIKE` variable contains identifiers of similar distros to the one running, separated by spaces.
+
+For example, it's set to `opensuse suse` in an OpenSUSE Tumbleweed docker image and `rhel fedora` in a CentOS 8 docker image.
+
 ### DISTRO_VERSION_ID
 
 The `DISTRO_VERSION_ID` variable is the version identifier of the distro as defined in its `os-release` file.