From bca78d2597c78b0166d76d023eee1354f5abd04e Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Wed, 27 Mar 2024 11:27:01 -0400
Subject: tests/xspawn: New unit test

---
 tests/xspawn.c | 154 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 tests/xspawn.c

(limited to 'tests/xspawn.c')

diff --git a/tests/xspawn.c b/tests/xspawn.c
new file mode 100644
index 0000000..e356842
--- /dev/null
+++ b/tests/xspawn.c
@@ -0,0 +1,154 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#include "tests.h"
+#include "../src/alloc.h"
+#include "../src/bfstd.h"
+#include "../src/config.h"
+#include "../src/dstring.h"
+#include "../src/xspawn.h"
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+
+/** Duplicate the current environment. */
+static char **envdup(void) {
+	extern char **environ;
+
+	char **envp = NULL;
+	size_t envc = 0;
+
+	for (char **var = environ; ; ++var) {
+		char *copy = NULL;
+		if (*var) {
+			copy = strdup(*var);
+			if (!copy) {
+				goto fail;
+			}
+		}
+
+		char **dest = RESERVE(char *, &envp, &envc);
+		if (!dest) {
+			free(copy);
+			goto fail;
+		}
+		*dest = copy;
+
+		if (!*var) {
+			break;
+		}
+	}
+
+	return envp;
+
+fail:
+	for (size_t i = 0; i < envc; ++i) {
+		free(envp[i]);
+	}
+	free(envp);
+	return NULL;
+}
+
+/** Check that we resolve executables in $PATH correctly. */
+static bool check_path_resolution(bool use_posix) {
+	bool ret = true;
+
+	struct bfs_spawn spawn;
+	ret &= bfs_pcheck(bfs_spawn_init(&spawn) == 0);
+	if (!ret) {
+		goto out;
+	}
+
+	spawn.flags |= BFS_SPAWN_USE_PATH;
+	if (!use_posix) {
+		spawn.flags &= ~BFS_SPAWN_USE_POSIX;
+	}
+
+	const char *builddir = getenv("BUILDDIR");
+	dchar *bin = dstrprintf("%s/bin", builddir ? builddir : ".");
+	ret &= bfs_pcheck(bin, "dstrprintf()");
+	if (!ret) {
+		goto destroy;
+	}
+
+	ret &= bfs_pcheck(bfs_spawn_addopen(&spawn, 10, bin, O_RDONLY | O_DIRECTORY, 0) == 0);
+	ret &= bfs_pcheck(bfs_spawn_addfchdir(&spawn, 10) == 0);
+	ret &= bfs_pcheck(bfs_spawn_addclose(&spawn, 10) == 0);
+	if (!ret) {
+		goto bin;
+	}
+
+	// Check that $PATH is resolved in the parent's environment
+	char **envp;
+	ret &= bfs_pcheck(envp = envdup());
+	if (!ret) {
+		goto bin;
+	}
+
+	// Check that $PATH is resolved after the file actions
+	char *old_path = getenv("PATH");
+	dchar *new_path = NULL;
+	if (old_path) {
+		ret &= bfs_pcheck(old_path = strdup(old_path));
+		if (!ret) {
+			goto env;
+		}
+		new_path = dstrprintf("tests:%s", old_path);
+	} else {
+		new_path = dstrdup("tests");
+	}
+	ret &= bfs_check(new_path);
+	if (!ret) {
+		goto path;
+	}
+
+	ret &= bfs_pcheck(setenv("PATH", new_path, true) == 0);
+	if (!ret) {
+		goto path;
+	}
+
+	char *argv[] = {"xspawnee", old_path, NULL};
+	pid_t pid = bfs_spawn("xspawnee", &spawn, argv, envp);
+	ret &= bfs_pcheck(pid >= 0, "bfs_spawn()");
+	if (!ret) {
+		goto unset;
+	}
+
+	int wstatus;
+	ret &= bfs_pcheck(xwaitpid(pid, &wstatus, 0) == pid)
+		&& bfs_check(WIFEXITED(wstatus));
+	if (ret) {
+		int wexit = WEXITSTATUS(wstatus);
+		ret &= bfs_check(wexit == EXIT_SUCCESS, "xspawnee: exit(%d)", wexit);
+	}
+
+unset:
+	if (old_path) {
+		ret &= bfs_pcheck(setenv("PATH", old_path, true) == 0);
+	} else {
+		ret &= bfs_pcheck(unsetenv("PATH") == 0);
+	}
+path:
+	dstrfree(new_path);
+	free(old_path);
+env:
+	for (char **var = envp; *var; ++var) {
+		free(*var);
+	}
+	free(envp);
+bin:
+	dstrfree(bin);
+destroy:
+	ret &= bfs_pcheck(bfs_spawn_destroy(&spawn) == 0);
+out:
+	return ret;
+}
+
+bool check_xspawn(void) {
+	bool ret = true;
+
+	ret &= check_path_resolution(true);
+	ret &= check_path_resolution(false);
+
+	return ret;
+}
-- 
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