Usage of zlib

[Berry]

For which purpose is this line required

https://github.com/GoogleContainerTools/distroless/blob/main/java/BUILD#L119

?

[Andrew Latham]

That is a library often required for zip and it appears the naming on
debian does not have a lib- on it
https://packages.debian.org/trixie/zlib1g

zlib1g is only on Python and Java builds so I suspect it is to supply
the zip requirements for something.

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- Andrew "lathama" Latham -

[Andrew Latham]

It is a requirement for Python e.g.
https://github.com/lathama/slimimage/blob/main/Dockerfile#L10

[Evan Jones]

It is similarly a requirement for the JVM itself, as shown by the Debian package requirements [1]. I believe this is used to implement parts of the standard library, such as GZipInputStream. Java jar files are zip files, so I would guess the JVM uses this itself to decompress jar files.

[1] https://packages.debian.org/trixie/openjdk-21-jre

[2] https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/zip/GZIPInputStream.html

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