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TEST-72-SYSUPDATE: make randomly generated image file not have compression header

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Otherwise, the generated image may be wrongly detected as compressed,
and importing the image may fail:
```
[   35.194578] TEST-72-SYSUPDATE.sh[411]: + dd if=/dev/urandom of=/var/tmp/test-72-N7uTeO/source/part1-v5.raw bs=4096 count=2048
[   35.236342] TEST-72-SYSUPDATE.sh[1075]: 2048+0 records in
[   35.236342] TEST-72-SYSUPDATE.sh[1075]: 2048+0 records out
[   35.236342] TEST-72-SYSUPDATE.sh[1075]: 8388608 bytes (8.4 MB, 8.0 MiB) copied, 0.0408601 s, 205 MB/s
(snip)
[   35.948634] TEST-72-SYSUPDATE.sh[1085]: \ Acquiring /var/tmp/test-72-N7uTeO/source/part1-v5.raw → /proc/self/fd/3p2...
[   35.952878] TEST-72-SYSUPDATE.sh[1085]: Successfully forked off '(sd-import-raw)' as PID 1089.
[   35.958952] TEST-72-SYSUPDATE.sh[1089]: Importing '/var/tmp/test-72-N7uTeO/source/part1-v5.raw', saving at offset 9437184 in '/dev/loop0'.
[   35.959575] TEST-72-SYSUPDATE.sh[1089]: Failed to decode and write: Input/output error
[   35.959575] TEST-72-SYSUPDATE.sh[1089]: Exiting.
```

Fixes #38524.
This commit is contained in:
Yu Watanabe
2025-08-13 23:54:18 +09:00
parent 2633ed01ca
commit 535539222d
1 changed files with 5 additions and 2 deletions
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test/units/TEST-72-SYSUPDATE.sh
+5 -2
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@@ -61,8 +61,11 @@ new_version() {
local sector_size="${1:?}"
local version="${2:?}"
# Create a pair of random partition payloads, and compress one
dd if=/dev/urandom of="$WORKDIR/source/part1-$version.raw" bs="$sector_size" count=2048
# Create a pair of random partition payloads, and compress one.
# To make not the initial bytes of part1-xxx.raw accidentally match one of the compression header,
# let's make the first sector filled by zero.
dd if=/dev/zero of="$WORKDIR/source/part1-$version.raw" bs="$sector_size" count=1
dd if=/dev/urandom of="$WORKDIR/source/part1-$version.raw" bs="$sector_size" count=2047 conv=notrunc oflag=append
dd if=/dev/urandom of="$WORKDIR/source/part2-$version.raw" bs="$sector_size" count=2048
gzip -k -f "$WORKDIR/source/part2-$version.raw"