src: initial commit of jio WIP source

This is a very quick and dirty experimental hack written in some
sort of bastard continuation-passing style in C w/io_uring using
journal-file introspection and manipulation duty as an excuse for
its existence.

Consider this unfinished prototype quality code.

1 files changed, 139 insertions, 0 deletions

diff --git a/src/jio.c b/src/jio.c
new file mode 100644
index 0000000..2e98545
--- /dev/null
+++ b/src/jio.c
@@ -0,0 +1,139 @@
+/*
+ *  Copyright (C) 2020 - Vito Caputo - <vcaputo@pengaru.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 3 as published
+ *  by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <iou.h>
+
+#include "reclaim-tail-waste.h"
+#include "report-tail-waste.h"
+#include "report-usage.h"
+
+#include "upstream/journal-def.h"
+
+/* jio - journal-file input/output tool */
+
+/* Copyright (c) 2020 Vito Caputo <vcaputo@pengaru.com> */
+
+/* XXX: This is a WIP experiment, use at your own risk! XXX */
+
+int main(int argc, char *argv[])
+{
+	iou_t	*iou;
+	int	r;
+
+	if (argc < 2) {
+		printf("Usage: %s {help,reclaim,report} [subcommand-args]\n", argv[0]);
+		return 0;
+	}
+
+	iou = iou_new(8);
+	if (!iou)
+		return 1;
+
+	/* FIXME TODO This is ad-hoc open-coded jank for now */
+	if (!strcmp(argv[1], "help")) {
+		printf(
+			"\n"
+			" help                show this help\n"
+			" license             print license header\n"
+			" reclaim [subcmd]    reclaim space from journal files\n"
+			"         tail-waste  reclaim wasted space from tails of archives\n"
+			"\n"
+			" report  [subcmd]    report statistics about journal files\n"
+			"         usage       report space used by various object types\n"
+			"         tail-waste  report extra space allocated onto tails\n"
+			" version             print jio version\n"
+			"\n"
+		);
+		return 0;
+	} else if (!strcmp(argv[1], "license")) {
+		printf(
+			"\n"
+			" Copyright (C) 2020 - Vito Caputo - <vcaputo@pengaru.com>\n"
+			"\n"
+			" This program is free software: you can redistribute it and/or modify it\n"
+			" under the terms of the GNU General Public License version 3 as published\n"
+			" by the Free Software Foundation.\n"
+			"\n"
+			" This program is distributed in the hope that it will be useful,\n"
+			" but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
+			" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
+			" GNU General Public License for more details.\n"
+			"\n"
+			" You should have received a copy of the GNU General Public License\n"
+			" along with this program.  If not, see <http://www.gnu.org/licenses/>.\n"
+			"\n"
+		);
+		return 0;
+	} else if (!strcmp(argv[1], "reclaim")) {
+		if (argc < 3) {
+			printf("Usage: %s reclaim {tail-waste}\n", argv[0]);
+			return 0;
+		}
+
+		if (!strcmp(argv[2], "tail-waste")) {
+			r = jio_reclaim_tail_waste(iou, argc, argv);
+			if (r < 0) {
+				fprintf(stderr, "failed to reclaim tail waste: %s\n", strerror(-r));
+				return 1;
+			}
+		} else {
+			fprintf(stderr, "Unsupported reclaim subcommand: \"%s\"\n", argv[2]);
+			return 1;
+		}
+	} else if (!strcmp(argv[1], "report")) {
+		if (argc < 3) {
+			printf("Usage: %s report {usage,tail-waste}\n", argv[0]);
+			return 0;
+		}
+
+		if (!strcmp(argv[2], "tail-waste")) {
+			r = jio_report_tail_waste(iou, argc, argv);
+			if (r < 0) {
+				fprintf(stderr, "failed to report tail waste: %s\n", strerror(-r));
+				return 1;
+			}
+		} else if (!strcmp(argv[2], "usage")) {
+			r = jio_report_usage(iou, argc, argv);
+			if (r < 0) {
+				fprintf(stderr, "failed to report usage: %s\n", strerror(-r));
+				return 1;
+			}
+		} else {
+			fprintf(stderr, "Unsupported report subcommand: \"%s\"\n", argv[2]);
+			return 1;
+		}
+	} else if (!strcmp(argv[1], "version")) {
+		puts("jio version " VERSION);
+		return 0;
+	} else {
+		fprintf(stderr, "Unsupported subcommand: \"%s\"\n", argv[1]);
+		return 1;
+	}
+
+	if (!r) {
+		/* XXX: note this is a successful noop if there's no outstanding io */
+		r = iou_run(iou);
+		if (r < 0)
+			fprintf(stderr, "iou error: %s\n", strerror(-r));
+	}
+
+	iou_free(iou);
+
+	return r != 0;
+}