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Documentation

modularity-relevant CLI examples

The current state of CentOS 8 createrepo_c + modulemd-tools (EPEL8) allow us to:

Find all modular RPM files that under a directory and print their module information

This could identify dnf modules that would need to be re-created when shipping modular RPMs independently from their base repos:

find "$DIR_WITH_RPMS" -name \*.rpm \
  -exec rpm -qp {} --qf '%{NVRA}   %{ModularityLabel}\n' \; \
  | grep -v '(none)' \
  | tee modular_rpms.txt

The %{ModularityLabel} macro is returned in (module)name:stream:version:context:arch (NSVCA) format, so the result looks like this:

389-ds-base-1.4.3.8-5.module_el8.3.0+473+53682548.x86_64   389-ds:1.4:8030020200831174107:618f7055
389-ds-base-devel-1.4.3.8-5.module_el8.3.0+473+53682548.x86_64   389-ds:1.4:8030020200831174107:618f7055
389-ds-base-legacy-tools-1.4.3.8-5.module_el8.3.0+473+53682548.x86_64   389-ds:1.4:8030020200831174107:618f7055
389-ds-base-libs-1.4.3.8-5.module_el8.3.0+473+53682548.x86_64   389-ds:1.4:8030020200831174107:618f7055
389-ds-base-snmp-1.4.3.8-5.module_el8.3.0+473+53682548.x86_64   389-ds:1.4:8030020200831174107:618f7055
HdrHistogram-2.1.11-2.module_el8.2.0+460+6583c1d0.noarch   jmc:rhel8:8020020200731165725:21dc74c6
HdrHistogram-javadoc-2.1.11-2.module_el8.2.0+460+6583c1d0.noarch   jmc:rhel8:8020020200731165725:21dc74c6
Judy-1.0.5-18.module_el8.1.0+217+4d875839.x86_64   mariadb:10.3:8010020191115015915:cdc1202b
ant-1.10.5-1.module_el8.0.0+47+197dca37.noarch   ant:1.10:8000020190624202340:f7e686af
ant-lib-1.10.5-1.module_el8.0.0+47+197dca37.noarch   ant:1.10:8000020190624202340:f7e686af
aopalliance-1.0-17.module_el8.0.0+39+6a9b6e22.noarch   maven:3.5:8000020190624140656:f7e686af
aopalliance-1.0-20.module_el8.3.0+568+0c23fd64.noarch   maven:3.6:8030020201104064112:a623df05

It should be possible to re-create specific modules streams based on the RPM’s unique headers. However, there are significant limitations:

  • %{ModularityLabel} does not include profile information (NVSCA/P) so any modules or streams recreated based on the RPM header will lose all the original modules' profiles.

This comes back with some results in module:stream:version:context:arch format,

Identify all unique modules/streames from a collection of RPM files

find "$DIR_WITH_RPMS" -name \*.rpm \
  -exec rpm -qp {} --qf '%{ModularityLabel}\n' \; \
  | grep -v '^(none)' | sort | uniq -c \
  | sort -nk1,1 \
  | tee unique_rpm_module_streams.txt

Mirror the contents of a DNF repository, preserving all modules and package groups. 

(Works from CentOS 8.3 and CentOS 7.8, requires packages dnf and dnf-plugin-core )

An example of this mirroring a mounted CentOS 8.3 ISO’s AppStream repository:

PATH_TO_LOCAL_MIRROR=/path/to/Appstream
PATH_TO_SOURCE_REPO=/mnt/AppStream

dnf reposync \
  --download-metadata --downloadcomps \
  --download-path "$PATH_TO_LOCAL_MIRROR" \
  --repofrompath iso,"$PATH_TO_SOURCE_REPO" \
  --repoid iso

# Useful EL8-only options: --remote-time --norepopath

This should probably be the only kind of mirroring that on-site scripts like unpack_dvd use

DNF repoclosure

Judging by the bug report at https://bugzilla.redhat.com/show_bug.cgi?id=1547041, dnf repoclosure is not module-aware. However, 

dnf repoclosure --repofrompath iso,"$PWD" --repo appstream --repo baseos

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