From dd6321c0acf7b0570811200a205cc4104bee49c7 Mon Sep 17 00:00:00 2001
From: David Härdeman <david@hardeman.nu>
Date: Thu, 9 Jul 2020 20:36:15 +0200
Subject: Implement a basic init command in minecctl to create an initial
 example config

---
 minecctl/misc.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

(limited to 'minecctl/misc.c')

diff --git a/minecctl/misc.c b/minecctl/misc.c
index 525b09a..26cbc86 100644
--- a/minecctl/misc.c
+++ b/minecctl/misc.c
@@ -5,11 +5,84 @@
 #include <stdarg.h>
 #include <string.h>
 #include <termios.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <errno.h>
 
 #include "shared/utils.h"
 #include "misc.h"
 #include "minecctl.h"
 
+static const char *get_homedir()
+{
+	const char *e;
+        struct passwd *passwd;
+        uid_t uid;
+
+	e = getenv("HOME");
+	if (e && e[0] == '/')
+		return e;
+
+	uid = getuid();
+	if (uid == 0)
+		return "/root";
+
+        passwd = getpwuid(uid);
+	if (passwd && passwd->pw_dir[0] == '/')
+		return passwd->pw_dir;
+
+	return NULL;
+}
+
+int open_subdir(int dfd, const char *subdir, bool nofail)
+{
+	int sfd;
+
+	if (nofail && mkdirat(dfd, subdir, 0777) < 0 && errno != EEXIST) {
+		error("Unable to create subdirectory %s: %m", subdir);
+		return -1;
+	}
+
+	sfd = openat(dfd, subdir, O_PATH | O_CLOEXEC | O_DIRECTORY);
+	if (sfd < 0 && nofail)
+		error("Unable to open subdirectory %s: %m", subdir);
+
+	return sfd;
+}
+
+int open_xdg_dir(const char *envname, const char *altpath, bool nofail)
+{
+        const char *e;
+	const char *h;
+	int dfd, hfd;
+
+	e = getenv(envname);
+	if (e && e[0] == '/') {
+		dfd = open(e, O_PATH | O_CLOEXEC | O_DIRECTORY);
+		if (dfd < 0)
+			error("Unable to open $%s(%s): %m", envname, e);
+		return dfd;
+	}
+
+	h = get_homedir();
+	if (!h) {
+		error("Unable to determine home directory");
+		return -1;
+	}
+
+	hfd = open(h, O_PATH | O_CLOEXEC | O_DIRECTORY);
+	if (hfd < 0) {
+		error("Unable to open $HOME(%s): %m", h);
+		return -1;
+	}
+
+	dfd = open_subdir(hfd, altpath, nofail);
+	close(hfd);
+	return dfd;
+}
+
 /* FIXME: Can be shared */
 void set_use_colors()
 {
-- 
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