tests: (fdisk) avoid hardcoding of errno string

The test fdisk/oddinput hardcodes strings returned by strerror(3P) for
both the errors ENOENT and ENOTTY. As these strings are unportable,
convert the tests to use the test_strerror helper instead to convert
them with sed(1).

Signed-off-by: Patrick Steinhardt <ps@pks.im>

tests/expected/fdisk/oddinput

@@ -6,6 +6,6 @@ Units: cylinders of 16065 * 512 = 8225280 bytes
 Sector size (logical/physical): 512 bytes / 512 bytes
 I/O size (minimum/optimal): 512 bytes / 512 bytes
 Nonexistent file
-fdisk: cannot open _a_file_that_does_not_exist_: No such file or directory
+fdisk: cannot open _a_file_that_does_not_exist_: ENOENT
 Too small file
-fdisk: cannot open oddinput.toosmall: Inappropriate ioctl for device
+fdisk: cannot open oddinput.toosmall: ENOTTY

tests/helpers/test_strerror.c

@@ -18,6 +18,8 @@ static struct {
 	const char *str;
 	int error;
 } errors[] = {
+	E(ENOENT),
+	E(ENOTTY),
 	E(EILSEQ)
 };
 

tests/ts/fdisk/oddinput

@@ -38,10 +38,12 @@ ts_log "Empty image listing" # this should report empty partition table
 $TS_CMD_FDISK -c=dos -u=cylinders -l ${TEST_IMAGE_NAME} 2>&1 | sed -e "s/${TEST_IMAGE_NAME//\//\\/}/testimage/" >> $TS_OUTPUT
 
 ts_log "Nonexistent file" # this originally does absolutely nothing
-$TS_CMD_FDISK -c=dos -u=cylinders -l _a_file_that_does_not_exist_ >> $TS_OUTPUT 2>&1
+$TS_CMD_FDISK -c=dos -u=cylinders -l _a_file_that_does_not_exist_ 2>&1 |
+    sed -e "s@$($TS_HELPER_STRERROR ENOENT)@ENOENT@" >> $TS_OUTPUT
 
 ts_log "Too small file" # same here
 echo  "This file is too small" >> oddinput.toosmall
-$TS_CMD_FDISK -c=dos -u=cylinders -l oddinput.toosmall >> $TS_OUTPUT 2>&1
+$TS_CMD_FDISK -c=dos -u=cylinders -l oddinput.toosmall 2>&1 |
+    sed -e "s@$($TS_HELPER_STRERROR ENOTTY)@ENOTTY@" >> $TS_OUTPUT
 rm oddinput.toosmall
 ts_finalize