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authorChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:24:58 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-06-30 12:27:06 +0000
commit33606b41d35115f887ea688b1a16f2ff85bf2fe4 (patch)
tree406b2c7b19a087ba437c68f3dbf0b589fa1d6150 /results/scraper/launchpad-without-comments/660366
parentadedf8771bc4de3113041ca21bd4d0d1c0014b6a (diff)
downloadqemu-analysis-33606b41d35115f887ea688b1a16f2ff85bf2fe4.tar.gz
qemu-analysis-33606b41d35115f887ea688b1a16f2ff85bf2fe4.zip
add launchpad bug reports without comments
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diff --git a/results/scraper/launchpad-without-comments/660366 b/results/scraper/launchpad-without-comments/660366
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+"qemu-img convert -O qcow2 -o backing_file" makes huge images
+
+$ dd if=/dev/urandom bs=1M of=1.img count=4
+4+0 records in
+4+0 records out
+4194304 bytes (4,2 MB) copied, 1,0413 s, 4,0 MB/s
+$ qemu-img create -f qcow2 -b 1.img 2.img
+Formatting '2.img', fmt=qcow2 size=4194304 backing_file='1.img' encryption=off cluster_size=0 
+$ qemu-img convert -O qcow2 -o backing_file=1.img 2.img 3.img
+$ du -h ?.img
+4,1M	1.img
+144K	2.img
+4,3M	3.img
+
+The conversion result is bigger then the source!
+
+It appears that "-o backing_file" is not applied to data (as expected). I.e. all data is put into the resulting image: both from source image and "backing" image.
+
+Expected behavior is to put only data that is not present in backing_file.
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