From: Mike Frysinger <vapier@gentoo.org>
Date: Sat, 15 Aug 2020 07:20:11 +0000 (-0400)
Subject: ddnuke: add fdisk+prompt to startup, and rough ETA
X-Git-Url: https://git.wh0rd.org/?p=home.git;a=commitdiff_plain;h=942a43e2e16198361bee17df0077435a5064a2ed

ddnuke: add fdisk+prompt to startup, and rough ETA
---

diff --git a/ddnuke.c b/ddnuke.c
index 1712d16..388a144 100644
--- a/ddnuke.c
+++ b/ddnuke.c
@@ -11,11 +11,13 @@
 #define _LARGEFILE64_SOURCE
 #define _GNU_SOURCE
 
+#include <ctype.h>
 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <locale.h>
+#include <spawn.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -25,6 +27,8 @@
 #include <unistd.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
 #include <linux/fs.h>
 
 static unsigned long long mbps(struct timespec *stime, struct timespec *etime, off_t len)
@@ -41,7 +45,7 @@ static off_t get_blk_size(int fd)
 {
 	uint64_t size;
 	if (ioctl(fd, BLKGETSIZE64, &size))
-		err(1, "ioctl(BLKGETSIZE64) failed");
+		err(EX_DATAERR, "ioctl(BLKGETSIZE64) failed");
 	return size;
 }
 
@@ -50,7 +54,7 @@ static off_t get_size(int fd)
 	struct stat st;
 
 	if (fstat(fd, &st))
-		err(1, "could not stat %i", fd);
+		err(EX_DATAERR, "could not stat %i", fd);
 
 	if (S_ISREG(st.st_mode))
 		return st.st_size;
@@ -58,7 +62,7 @@ static off_t get_size(int fd)
 		return get_blk_size(fd);
 
 	errno = EINVAL;
-	err(1, "unknown type of file");
+	err(EX_DATAERR, "unknown type of file");
 }
 
 static void nuke(int fd, off_t offset, off_t max_size, unsigned char pattern)
@@ -69,7 +73,7 @@ static void nuke(int fd, off_t offset, off_t max_size, unsigned char pattern)
 		printf("Writing 0x%X to the output\n", pattern);
 
 	if (lseek(fd, offset, SEEK_SET) != offset)
-		err(1, "lseek(%"PRIu64"u) failed", offset);
+		err(EX_DATAERR, "lseek(%"PRIu64"u) failed", offset);
 
 	unsigned long long speed = 0;
 	struct timespec stime, etime, itime;
@@ -90,8 +94,10 @@ static void nuke(int fd, off_t offset, off_t max_size, unsigned char pattern)
 			return;
 		}
 
-		printf("\r\e[2K%'llu bytes %u%% (%'llu MB/s)", (unsigned long long)pos,
-			(unsigned)((pos * 100) / max_size), speed);
+		unsigned long long eta = speed ? (max_size - pos) / (speed * 1000 * 1000) : 0;
+		printf("\r\e[2K%'llu bytes %u%% (%'llu MB/s) (ETA ~%llum%llus)",
+			(unsigned long long)pos, (unsigned)((pos * 100) / max_size), speed,
+			eta / 60, eta % 60);
 
 		if ((++fsync_pos % 32) == 0) {
 			speed = mbps(&stime, &etime, pos - last_pos);
@@ -111,6 +117,8 @@ static void usage(int status)
 		"Usage: ddnuke [options] <dev>\n"
 		"\n"
 		"Options:\n"
+		" -q            Run quietly\n"
+		" -y            Assume yes to all prompts\n"
 		" -o <offset>   Position to start writing\n"
 		" -r            Write three times: 0x00, then 0xaa, then 0x55\n"
 	);
@@ -121,19 +129,27 @@ int main(int argc, char *argv[])
 {
 	off_t offset = 0;
 	const char *file;
+	bool quiet = false;
 	bool random = false;
+	bool yes = false;
 	int o;
 
 	setlocale(LC_NUMERIC, "en_US");
 
-	while ((o = getopt(argc, argv, "ho:r")) != -1) {
+	while ((o = getopt(argc, argv, "ho:qry")) != -1) {
 		switch (o) {
 		case 'o':
 			offset = atoll(optarg);
 			break;
+		case 'q':
+			quiet = true;
+			break;
 		case 'r':
 			random = true;
 			break;
+		case 'y':
+			yes = true;
+			break;
 		case 'h':
 			usage(EX_OK);
 			break;
@@ -148,7 +164,25 @@ int main(int argc, char *argv[])
 
 	int fd = open(file, O_WRONLY|O_CLOEXEC);
 	if (fd == -1)
-		err(1, "open(%s) failed", file);
+		err(EX_NOINPUT, "open(%s) failed", file);
+
+	if (!quiet) {
+		pid_t pid;
+		const char *argv[] = {"fdisk", "-l", file, NULL};
+		if (posix_spawnp(&pid, argv[0], NULL, NULL, (char *const *)argv, NULL))
+			err(EX_OSERR, "spawn(%s %s) failed", argv[0], file);
+		waitpid(pid, NULL, 0);
+		printf("\n");
+	}
+
+	if (!yes) {
+		printf("Do you want to wipe '%s'? (y/N) ", file);
+		fflush(stdout);
+		char c = 0;
+		if (fread(&c, 1, 1, stdin)) {/* don't care */}
+		if (tolower(c) != 'y')
+			errx(EX_UNAVAILABLE, "User decided not to wipe");
+	}
 
 	off_t max_size = get_size(fd);