From d2c47697e149d406af266c9d59f140c24ee890ad Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Thu, 11 Sep 2014 15:28:15 +0200
Subject: [PATCH] sfdisk: add --verify

Signed-off-by: Karel Zak <kzak@redhat.com>
---
 disk-utils/fdisk-list.c | 12 +++---
 disk-utils/fdisk-list.h |  4 +-
 disk-utils/fdisk.c      |  4 +-
 disk-utils/sfdisk.c     | 91 ++++++++++++++++++++++++++++++++++++-----
 4 files changed, 91 insertions(+), 20 deletions(-)

diff --git a/disk-utils/fdisk-list.c b/disk-utils/fdisk-list.c
index 3d26f8b7a6..708e6939a9 100644
--- a/disk-utils/fdisk-list.c
+++ b/disk-utils/fdisk-list.c
@@ -220,7 +220,7 @@ char *next_proc_partition(FILE **f)
 	return NULL;
 }
 
-int print_device_pt(struct fdisk_context *cxt, char *device, int warnme)
+int print_device_pt(struct fdisk_context *cxt, char *device, int warnme, int verify)
 {
 	if (fdisk_assign_device(cxt, device, 1) != 0) {	/* read-only */
 		if (warnme || errno == EACCES)
@@ -230,14 +230,16 @@ int print_device_pt(struct fdisk_context *cxt, char *device, int warnme)
 
 	list_disk_geometry(cxt);
 
-	if (fdisk_has_label(cxt))
+	if (fdisk_has_label(cxt)) {
 		list_disklabel(cxt);
-
+		if (verify)
+			fdisk_verify_disklabel(cxt);
+	}
 	fdisk_deassign_device(cxt, 1);
 	return 0;
 }
 
-void print_all_devices_pt(struct fdisk_context *cxt)
+void print_all_devices_pt(struct fdisk_context *cxt, int verify)
 {
 	FILE *f = NULL;
 	int ct = 0;
@@ -246,7 +248,7 @@ void print_all_devices_pt(struct fdisk_context *cxt)
 	while ((dev = next_proc_partition(&f))) {
 		if (ct)
 			fputs("\n\n", stdout);
-		if (print_device_pt(cxt, dev, 0) == 0)
+		if (print_device_pt(cxt, dev, 0, verify) == 0)
 			ct++;
 		free(dev);
 	}
diff --git a/disk-utils/fdisk-list.h b/disk-utils/fdisk-list.h
index dc61c58710..0a6ff734c9 100644
--- a/disk-utils/fdisk-list.h
+++ b/disk-utils/fdisk-list.h
@@ -5,7 +5,7 @@ extern void list_disklabel(struct fdisk_context *cxt);
 extern void list_disk_geometry(struct fdisk_context *cxt);
 
 extern char *next_proc_partition(FILE **f);
-extern int print_device_pt(struct fdisk_context *cxt, char *device, int warnme);
-extern void print_all_devices_pt(struct fdisk_context *cxt);
+extern int print_device_pt(struct fdisk_context *cxt, char *device, int warnme, int verify);
+extern void print_all_devices_pt(struct fdisk_context *cxt, int verify);
 
 #endif /* UTIL_LINUX_FDISK_LIST_H */
diff --git a/disk-utils/fdisk.c b/disk-utils/fdisk.c
index ab48303025..b7063b81d6 100644
--- a/disk-utils/fdisk.c
+++ b/disk-utils/fdisk.c
@@ -804,9 +804,9 @@ int main(int argc, char **argv)
 		if (argc > optind) {
 			int k;
 			for (k = optind; k < argc; k++)
-				print_device_pt(cxt, argv[k], 1);
+				print_device_pt(cxt, argv[k], 1, 0);
 		} else
-			print_all_devices_pt(cxt);
+			print_all_devices_pt(cxt, 0);
 		break;
 
 	case ACT_SHOWSIZE:
diff --git a/disk-utils/sfdisk.c b/disk-utils/sfdisk.c
index f650ddac3a..b4ac71ed78 100644
--- a/disk-utils/sfdisk.c
+++ b/disk-utils/sfdisk.c
@@ -59,8 +59,7 @@ UL_DEBUG_DEFINE_MASKANEMS(sfdisk) = UL_DEBUG_EMPTY_MASKNAMES;
 #define ON_DBG(m, x)    __UL_DBG_CALL(sfdisk, SFDISKPROG_DEBUG_, m, x)
 
 enum {
-	ACT_FDISK = 0,		/* default */
-
+	ACT_FDISK = 1,
 	ACT_ACTIVATE,
 	ACT_CHANGE_ID,
 	ACT_DUMP,
@@ -76,6 +75,8 @@ struct sfdisk {
 	const char	*label;		/* --label <label> */
 
 	struct fdisk_context	*cxt;	/* libfdisk context */
+
+	unsigned int verify : 1;	/* call fdisk_verify_disklabel() */
 };
 
 
@@ -198,11 +199,11 @@ static int command_list_partitions(struct sfdisk *sf, int argc, char **argv)
 		for (i = 0; i < argc; i++) {
 			if (ct)
 				fputs("\n\n", stdout);
-			if (print_device_pt(sf->cxt, argv[i], 0) == 0)
+			if (print_device_pt(sf->cxt, argv[i], 0, sf->verify) == 0)
 				ct++;
 		}
 	} else
-		print_all_devices_pt(sf->cxt);
+		print_all_devices_pt(sf->cxt, sf->verify);
 
 	return 0;
 }
@@ -241,6 +242,62 @@ static int command_list_types(struct sfdisk *sf)
 	return 0;
 }
 
+static int verify_device(struct sfdisk *sf, const char *devname)
+{
+	int rc = 1;
+
+	fdisk_enable_listonly(sf->cxt, 1);
+
+	if (fdisk_assign_device(sf->cxt, devname, 1)) {
+		warn(_("cannot open: %s"), devname);
+		return 1;
+	}
+
+	color_scheme_enable("header", UL_COLOR_BOLD);
+	fdisk_info(sf->cxt, "%s:", devname);
+	color_disable();
+
+	if (!fdisk_has_label(sf->cxt))
+		fdisk_info(sf->cxt, _("unrecognized partition table type"));
+	else
+		rc = fdisk_verify_disklabel(sf->cxt);
+
+	fdisk_deassign_device(sf->cxt, 1);
+	return rc;
+}
+
+/*
+ * sfdisk --verify [<device ..]
+ */
+static int command_verify(struct sfdisk *sf, int argc, char **argv)
+{
+	int nfails = 0, ct = 0;
+
+	if (argc) {
+		int i;
+		for (i = 0; i < argc; i++) {
+			if (i)
+				fdisk_info(sf->cxt, " ");
+			if (verify_device(sf, argv[i]) < 0)
+				nfails++;
+		}
+	} else {
+		FILE *f = NULL;
+		char *dev;
+
+		while ((dev = next_proc_partition(&f))) {
+			if (ct)
+				fdisk_info(sf->cxt, " ");
+			if (verify_device(sf, dev) < 0)
+				nfails++;
+			free(dev);
+			ct++;
+		}
+	}
+
+	return nfails;
+}
+
 static int get_size(const char *dev, int silent, uintmax_t *sz)
 {
 	int fd, rc = 0;
@@ -707,9 +764,9 @@ static void __attribute__ ((__noreturn__)) usage(FILE *out)
 	fputs(_(" -N, --partno <num>   specify partition number\n"), out);
 	fputs(_(" -s, --show-size      list the size of all or specified device\n"), out);
 	fputs(_(" -T, --list-types     print the recognized types (see -X)\n"), out);
+	fputs(_(" -V, --verify         test whether partitions seem correct\n"), out);
 	fputs(_(" -X, --label <name>   specify label type (dos, gpt, ...)\n"), out);
 
-
 	fputs(USAGE_SEPARATOR, out);
 	fputs(USAGE_HELP, out);
 	fputs(USAGE_VERSION, out);
@@ -724,20 +781,20 @@ int main(int argc, char *argv[])
 {
 	int rc = -EINVAL, c;
 	struct sfdisk _sf = {
-		.act = 0,
 		.partno = -1
 	}, *sf = &_sf;
 
 	static const struct option longopts[] = {
 		{ "activate",no_argument,	NULL, 'a' },
-		{ "list",    no_argument,       NULL, 'l' },
 		{ "dump",    no_argument,	NULL, 'd' },
 		{ "help",    no_argument,       NULL, 'h' },
-		{ "show-size", no_argument,	NULL, 's' },
-		{ "partno",  required_argument, NULL, 'N' },
 		{ "label",   required_argument, NULL, 'X' },
-		{ "version", no_argument,       NULL, 'v' },
+		{ "list",    no_argument,       NULL, 'l' },
 		{ "list-types", no_argument,	NULL, 'T' },
+		{ "partno",  required_argument, NULL, 'N' },
+		{ "show-size", no_argument,	NULL, 's' },
+		{ "verify",  no_argument,       NULL, 'V' },
+		{ "version", no_argument,       NULL, 'v' },
 		{ NULL, 0, 0, 0 },
 	};
 
@@ -746,7 +803,7 @@ int main(int argc, char *argv[])
 	textdomain(PACKAGE);
 	atexit(close_stdout);
 
-	while ((c = getopt_long(argc, argv, "adhlN:sTvX:", longopts, NULL)) != -1) {
+	while ((c = getopt_long(argc, argv, "adhlN:sTvVX:", longopts, NULL)) != -1) {
 		switch(c) {
 		case 'a':
 			sf->act = ACT_ACTIVATE;
@@ -776,6 +833,9 @@ int main(int argc, char *argv[])
 			printf(_("%s from %s\n"), program_invocation_short_name,
 						  PACKAGE_STRING);
 			return EXIT_SUCCESS;
+		case 'V':
+			sf->verify = 1;
+			break;
 		default:
 			usage(stderr);
 		}
@@ -783,6 +843,11 @@ int main(int argc, char *argv[])
 
 	sfdisk_init(sf);
 
+	if (sf->verify && !sf->act)
+		sf->act = ACT_VERIFY;	/* --verify make be used with --list too */
+	else if (!sf->act)
+		sf->act = ACT_FDISK;	/* default */
+
 	switch (sf->act) {
 	case ACT_ACTIVATE:
 		rc = command_activate(sf, argc - optind, argv + optind);
@@ -807,6 +872,10 @@ int main(int argc, char *argv[])
 	case ACT_SHOW_SIZE:
 		rc = command_show_size(sf, argc - optind, argv + optind);
 		break;
+
+	case ACT_VERIFY:
+		rc = command_verify(sf, argc - optind, argv + optind);
+		break;
 	}
 
 	sfdisk_deinit(sf);
-- 
2.47.2