From 42487c8b04c84e9e86263d162bc39586128216de Mon Sep 17 00:00:00 2001
From: Vishnu Santhosh <24693424+vishnu-santhosh@users.noreply.github.com>
Date: Thu, 21 May 2026 07:39:49 +0530
Subject: [PATCH] tiny-agent: switch to autotools build

The Yocto recipe in meta-tiny-agent inherits the `autotools` class,
which expects a standard `./configure && make && make install
DESTDIR=...` flow. The hand-rolled Makefile supported none of what
the recipe needs:

  - No `--host=` cross-compilation (Yocto builds on x86_64 host for
    arm/x86_64 target via sysroot + cross-toolchain)
  - No `DESTDIR` honored by install (breaks Yocto's `do_install`)
  - No `--prefix`/`--sysconfdir` for FHS-correct file placement
  - No `PKG_CHECK_MODULES` for sysroot-aware libcurl/jansson
    detection (needed in Phase 2)
  - No `make distcheck` to catch any of the above pre-package

Re-implementing all of that manually would mean rewriting half of
automake and getting it wrong. autoconf+automake is what Yocto
expects, so we use it.

configure.ac currently checks only for pty.h and forkpty() in
libutil; libcurl, jansson, and systemd detection are deferred to
the PRs that add code depending on them. Same source, same binary,
same behavior - only the build system changes.

Build:  ./autogen.sh && ./configure && make
Verify: make distcheck (passes clean)
Clean:  git clean -fdX  (removes all gitignored autotools artifacts)

Binary moves from build/pty_test to src/pty_test.
---
 tiny-agent/.gitignore      | 26 ++++++++++++++++++++++++++
 tiny-agent/Makefile        | 19 -------------------
 tiny-agent/Makefile.am     |  3 +++
 tiny-agent/autogen.sh      |  2 ++
 tiny-agent/configure.ac    | 22 ++++++++++++++++++++++
 tiny-agent/src/Makefile.am |  4 ++++
 6 files changed, 57 insertions(+), 19 deletions(-)
 delete mode 100644 tiny-agent/Makefile
 create mode 100644 tiny-agent/Makefile.am
 create mode 100755 tiny-agent/autogen.sh
 create mode 100644 tiny-agent/configure.ac
 create mode 100644 tiny-agent/src/Makefile.am

diff --git a/tiny-agent/.gitignore b/tiny-agent/.gitignore
index bffbdc5..6b08279 100644
--- a/tiny-agent/.gitignore
+++ b/tiny-agent/.gitignore
@@ -1,8 +1,34 @@
+# Hand-rolled build dir (legacy, kept for any in-flight bare-make users)
 build/
+
+# Object files
 *.o
+*.a
+
+# Autotools generated
+Makefile
 Makefile.in
 configure
+config.h
+config.h.in
+config.log
+config.status
+
+# Autoreconf --force backup files (and any editor backups)
+*~
 aclocal.m4
 autom4te.cache/
+build-aux/
+m4/
+stamp-h1
 .deps/
 .libs/
+
+# Built binary
+pty_test
+
+# Dist tarballs and distcheck temp dirs
+*.tar.gz
+*.tar.bz2
+*.tar.xz
+tiny-agent-*/
diff --git a/tiny-agent/Makefile b/tiny-agent/Makefile
deleted file mode 100644
index e8bcdce..0000000
--- a/tiny-agent/Makefile
+++ /dev/null
@@ -1,19 +0,0 @@
-CC      = gcc
-CFLAGS  = -Wall -Wextra -std=c99 -g
-LDFLAGS = -lutil
-
-SRC = src/pty.c
-BIN = build/pty_test
-
-.PHONY: all clean
-
-all: $(BIN)
-
-$(BIN): $(SRC) | build
-	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
-
-build:
-	mkdir -p build
-
-clean:
-	rm -rf build
diff --git a/tiny-agent/Makefile.am b/tiny-agent/Makefile.am
new file mode 100644
index 0000000..5ff2f58
--- /dev/null
+++ b/tiny-agent/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = src
+
+EXTRA_DIST = autogen.sh
diff --git a/tiny-agent/autogen.sh b/tiny-agent/autogen.sh
new file mode 100755
index 0000000..525de60
--- /dev/null
+++ b/tiny-agent/autogen.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+exec autoreconf --install --force --verbose
diff --git a/tiny-agent/configure.ac b/tiny-agent/configure.ac
new file mode 100644
index 0000000..bf7036c
--- /dev/null
+++ b/tiny-agent/configure.ac
@@ -0,0 +1,22 @@
+AC_PREREQ([2.69])
+AC_INIT([tiny-agent], [0.1.0], [https://github.com/vivekvjnk/tiny-agent/issues])
+AC_CONFIG_AUX_DIR([build-aux])
+AC_CONFIG_SRCDIR([src/pty.c])
+AC_CONFIG_HEADERS([config.h])
+
+AM_INIT_AUTOMAKE([1.15 foreign subdir-objects -Wall -Werror])
+AM_SILENT_RULES([yes])
+
+AC_PROG_CC
+AC_PROG_INSTALL
+
+# PTY support
+AC_CHECK_HEADER([pty.h], [], [AC_MSG_ERROR([pty.h not found])])
+AC_CHECK_LIB([util], [forkpty], [],
+    [AC_MSG_ERROR([libutil with forkpty() not found])])
+
+AC_CONFIG_FILES([
+    Makefile
+    src/Makefile
+])
+AC_OUTPUT
diff --git a/tiny-agent/src/Makefile.am b/tiny-agent/src/Makefile.am
new file mode 100644
index 0000000..ef5765e
--- /dev/null
+++ b/tiny-agent/src/Makefile.am
@@ -0,0 +1,4 @@
+AM_CFLAGS = -Wall -Wextra -std=c99
+
+bin_PROGRAMS = pty_test
+pty_test_SOURCES = pty.c