bootimg: remove previous FATIMG before creating a new one

Since version 3.0.0 of dosfstools, mkdosfs opens the to-be-filesystem
file with O_EXCL. Since the filesystem is also opened with O_CREAT,
the -C option of mkdosfs can only succeed if FATIMG does not exists.
Thus, delete any previous FATIMG file. The file can be safely deleted
as we are inside build_fat_img because we want to create an new
FATIMG.

(From OE-Core rev: a0d4511d358d427e5271420a74c26cc862c5ed74)

Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/meta/classes/bootimg.bbclass b/meta/classes/bootimg.bbclass
index dbbf046d3a..ebc927edc7 100644
--- a/meta/classes/bootimg.bbclass
+++ b/meta/classes/bootimg.bbclass
@@ -227,6 +227,12 @@ build_fat_img() {
                 FATSIZE="-F 32"
         fi
 
+        # mkdosfs will fail if ${FATIMG} exists. Since we are creating an
+        # new image, it is safe to delete any previous image.
+        if [ -e ${FATIMG} ]; then
+                rm ${FATIMG}
+        fi
+
         if [ -z "${HDDIMG_ID}" ]; then
                 mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} -S 512 -C ${FATIMG} \
                         ${BLOCKS}