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Document that zstd:chunked is downgraded to zstd when encrypting #2176

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Sep 27, 2024
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Document that zstd:chunked is downgraded to zstd when encrypting #2176

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5 changes: 5 additions & 0 deletions docs/containers.conf.5.md
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Expand Up @@ -486,6 +486,9 @@ Name of destination for accessing the Podman service. See SERVICE DESTINATION TA
List of compression algorithms. If set makes sure that requested compression variant
for each platform is added to the manifest list keeping original instance intact in
the same manifest list on every `manifest push`. Supported values are (`gzip`, `zstd` and `zstd:chunked`).
`zstd:chunked` is incompatible with encrypting images, and will be treated as `zstd` with a warning
in that case.


Note: This is different from `compression_format` which allows users to select a default
compression format for `push` and `manifest push`, while `add_compression` is limited to
Expand Down Expand Up @@ -855,6 +858,8 @@ Specifies the compression format to use when pushing an image. Supported values
are: `gzip`, `zstd` and `zstd:chunked`. This field is ignored when pushing
images to the docker-daemon and docker-archive formats. It is also ignored
when the manifest format is set to v2s2.
`zstd:chunked` is incompatible with encrypting images, and will be treated as `zstd` with a warning
in that case.

**compression_level**="5"

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4 changes: 4 additions & 0 deletions pkg/config/containers.conf
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Expand Up @@ -416,6 +416,8 @@ default_sysctls = [
#List of compression algorithms. If set makes sure that requested compression variant
#for each platform is added to the manifest list keeping original instance intact in
#the same manifest list on every `manifest push`. Supported values are (`gzip`, `zstd` and `zstd:chunked`).
#`zstd:chunked` is incompatible with encrypting images, and will be treated as `zstd` with a warning
#in that case.
#
#add_compression = ["gzip", "zstd", "zstd:chunked"]

Expand All @@ -438,6 +440,8 @@ default_sysctls = [
# This field is ignored when pushing images to the docker-daemon and
# docker-archive formats. It is also ignored when the manifest format is set
# to v2s2.
# `zstd:chunked` is incompatible with encrypting images, and will be treated as `zstd` with a warning
# in that case.
#
#compression_format = "gzip"

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2 changes: 2 additions & 0 deletions pkg/config/containers.conf-freebsd
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Expand Up @@ -326,6 +326,8 @@ default_sysctls = [

# The compression format to use when pushing an image.
# Valid options are: `gzip`, `zstd` and `zstd:chunked`.
# `zstd:chunked` is incompatible with encrypting images, and will be treated as `zstd` with a warning
# in that case.
#
#compression_format = "gzip"

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