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hd-image: add support for specifying byte value used for filling #274

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hd-image: add support for specifying byte value used for filling #274

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3 changes: 2 additions & 1 deletion README.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -122,7 +122,8 @@ Partition options:
:image: The image file this partition shall be filled with
:fill: Boolean specifying that all bytes of the partition should be
explicitly initialized. Any bytes beyond the size of the specified
image will be set to 0.
image will be set to ``fill-value``.
:fill-value: Byte value used when ``fill`` is true, defaults to 0.
:autoresize: Boolean specifying that the partition should be resized
automatically. For UBI volumes this means that the
``autoresize`` flag is set. Only one volume can have this flag.
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2 changes: 2 additions & 0 deletions genimage.c
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Expand Up @@ -102,6 +102,7 @@ static cfg_opt_t partition_opts[] = {
CFG_BOOL("hidden", cfg_false, CFGF_NONE),
CFG_BOOL("no-automount", cfg_false, CFGF_NONE),
CFG_BOOL("fill", cfg_false, CFGF_NONE),
CFG_INT("fill-value", 0, CFGF_NONE),
CFG_STR("image", NULL, CFGF_NONE),
CFG_STR_LIST("holes", NULL, CFGF_NONE),
CFG_BOOL("autoresize", 0, CFGF_NONE),
Expand Down Expand Up @@ -403,6 +404,7 @@ static int parse_partitions(struct image *image, cfg_t *imagesec)
part->hidden = cfg_getbool(partsec, "hidden");
part->no_automount = cfg_getbool(partsec, "no-automount");
part->fill = cfg_getbool(partsec, "fill");
part->fill_value = cfg_getint(partsec, "fill-value");
part->image = cfg_getstr(partsec, "image");
part->autoresize = cfg_getbool(partsec, "autoresize");
part->in_partition_table = cfg_getbool(partsec, "in-partition-table");
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1 change: 1 addition & 0 deletions genimage.h
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Expand Up @@ -45,6 +45,7 @@ struct partition {
cfg_bool_t hidden;
cfg_bool_t no_automount;
cfg_bool_t fill;
unsigned char fill_value;
const char *image;
off_t imageoffset;
struct list_head list;
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3 changes: 2 additions & 1 deletion image-hd.c
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Expand Up @@ -609,7 +609,8 @@ static int hdimage_generate(struct image *image)
return -E2BIG;
}

ret = insert_image(image, child, part->fill ? part->size : child->size, part->offset, 0);
ret = insert_image(image, child, part->fill ? part->size : child->size,
part->offset, part->fill_value);
if (ret) {
image_error(image, "failed to write image partition '%s'\n",
part->name);
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