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filemap: add parameter 'length' to sparse_copy

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Added parameter 'length' to specify amount of data
to write into destination file. This is useful when only
part of source file should be written into destination file.

(From OE-Core rev: cc44e2eb3b5027a3531e6349937a23d73313b3c6)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Ed Bartosh
2017-06-13 14:21:51 +03:00
committed by Richard Purdie
parent ce7895a61c
commit 16562e7672
1 changed files with 12 additions and 3 deletions
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15
scripts/lib/wic/filemap.py
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@@ -530,7 +530,8 @@ def filemap(image, log=None):
except ErrorNotSupp:
return FilemapSeek(image, log)
def sparse_copy(src_fname, dst_fname, offset=0, skip=0, api=None):
def sparse_copy(src_fname, dst_fname, offset=0, skip=0,
length=0, api=None):
"""Efficiently copy sparse file to or into another file."""
if not api:
api = filemap
@@ -541,6 +542,7 @@ def sparse_copy(src_fname, dst_fname, offset=0, skip=0, api=None):
dst_file = open(dst_fname, 'wb')
dst_file.truncate(os.path.getsize(src_fname))
written = 0
for first, last in fmap.get_mapped_ranges(0, fmap.blocks_cnt):
start = first * fmap.block_size
end = (last + 1) * fmap.block_size
@@ -561,7 +563,14 @@ def sparse_copy(src_fname, dst_fname, offset=0, skip=0, api=None):
while read < to_read:
if read + chunk_size > to_read:
chunk_size = to_read - read
chunk = fmap._f_image.read(chunk_size)
size = chunk_size
if length and written + size > length:
size = length - written
chunk = fmap._f_image.read(size)
dst_file.write(chunk)
read += chunk_size
read += size
written += size
if written == length:
dst_file.close()
return
dst_file.close()