On 05/19/2018 12:25 AM, Francesco wrote:
Hi Jeff,
2018-05-18 18:54 GMT+02:00 Jeff Johnson <n3...@me.com
<mailto:n3...@me.com>>:
You do realize that rpm already computes a digest (usually SHA256,
but MD5 can be configured) for all files in a *.rpm package file?
That information can be retrieved using --queryformat easily (if
make can use digests other than MD5).
No, I really did not know that. I explored --queryformat and found out
on my Centos7 system that indeed the command
rpm -q --qf '[%{filenames} %{FILEMD5S}\n]' coreutils | grep date
provides:
/usr/bin/date
0955c235d9f069b32d22830f661071a33d99425dc5eca69b8da99654c67e0cc7
that really looks exactly what I needed!
Actually as you say that's not a md5 checksum (as the tag name FILEMD5S
would suggest) but rather a sha256 checksum, but for my purpose there's
no difference.
The FILEMD5S tag is a backwards compatibility leftover, the actual tag
name is FILEDIGESTS since rpm 4.6.x and the used algorithm in
FILEDIGESTALGO. See
https://github.com/rpm-software-management/rpm/blob/master/macros.in#L393
for the configuration + values.
- Panu -
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