File fatresize-fix-getting-dev-name.patch of Package parted

From: Sebastian Parschauer <sparschauer@suse.de>
Date: Sun, 3 Dec 2017 12:09:44 +0100
Subject: Fix getting the device name from partition name
References: boo#959181
Patch-mainline: submitted, https://github.com/ya-mouse/fatresize/pull/4

There are many partition device names like e.g. /dev/mmcblk0p1 where
it is not enough to trim the trailing digits to get the disk device
name. Using open() here would depend on a POSIX platform. So do it
like _ped_device_probe() and silence libparted exceptions and try
to get the device with ped_device_get(). Trim further trailing
characters until libparted finds it. Print an error and exit if
the partition name is invalid.

Fixes #2

Signed-off-by: Sebastian Parschauer <sparschauer@suse.de>
---
 fatresize/fatresize.c |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

--- a/fatresize/fatresize.c
+++ b/fatresize/fatresize.c
@@ -9,6 +9,7 @@
 #include <unistd.h>
 #include <ctype.h>
 
+#include <parted/parted.h>
 #include <parted/device.h>
 #include <parted/filesys.h>
 
@@ -79,6 +80,18 @@ resize(const char* disk_device, int part
 }
 
 
+/* Code parts have been taken from _ped_device_probe(). */
+static void
+probe_device(PedDevice **dev, const char *path)
+{
+	ped_exception_fetch_all();
+	*dev = ped_device_get(path);
+	if (!*dev)
+		ped_exception_catch();
+	ped_exception_leave_all();
+}
+
+
 int
 main(int argc, char** argv)
 {
@@ -126,6 +139,22 @@ main(int argc, char** argv)
 	disk_device = strndup(argv[1], pos - argv[1] + 1);
 	partition_number = strtol(pos + 1, NULL, 10);
 
+	PedDevice *peddev = NULL;
+	/* check if the device really exists */
+	while (pos != argv[1] && *pos != '/' && !peddev)
+	{
+		disk_device[pos - argv[1] + 1] = '\0';
+		probe_device(&peddev, disk_device);
+		--pos;
+	}
+	if (!peddev)
+	{
+		free(disk_device);
+		fprintf(stderr, "invalid device\n");
+		exit(EXIT_FAILURE);
+	}
+	ped_device_destroy(peddev);
+
 	if (argc == 3)
 	{
 		char* endptr = NULL;
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