n3dr

The aims of the n3dr tool are:

to backup all artifacts from a certain Nexus maven repository.
to migrate all artifacts from NexusA to NexusB.

Installation

curl -L https://github.com/030/n3dr/releases/download/z.y.z/n3dr-linux -o n3dr-linux
curl -L https://github.com/030/n3dr/releases/download/z.y.z/n3dr-linux.sha512.txt -o n3dr-linux.sha512.txt
sha512sum --check n3dr-linux.sha512.txt
chmod +x n3dr-linux
./n3dr-linux

Debian

VERSION=z.y.z && \
curl -L https://github.com/030/n3dr/releases/download/${VERSION}/n3dr_${VERSION}-0.deb -o n3dr.deb && \
sudo apt -y install ./n3dr.deb

Check the help menu

user@computer:~/dev$ ./n3dr-linux -h
N3DR is a tool that is able to download all artifacts from
a certain Nexus3 repository.

Usage:
  n3dr [command]

Available Commands:
  backup       Backup all artifacts from a Nexus3 repository
  help         Help about any command
  repositories Count the number of repositories or return their names
  upload       Upload all artifacts to a specific Nexus3 repository

Flags:
  -v, --apiVersion string   The Nexus3 APIVersion, e.g. v1 or beta (default "v1")
  -d, --debug               Enable debug logging
  -h, --help                help for n3dr
      --insecureSkipVerify  Skip repository certificate check
  -p, --n3drPass string     The Nexus3 password
  -n, --n3drURL string      The Nexus3 URL
  -u, --n3drUser string     The Nexus3 user
  -z, --zip                 Add downloaded artifacts to a ZIP archive

Use "n3dr [command] --help" for more information about a command.

Store the password in a read-only file

Define the password in ~/.n3dr.yaml:

---
n3drPass: admin123

and set the permissions to 400 by issuing:

chmod 400 ~/.n3dr.yaml

Backup artifacts from a certain repository

All artifacts from a repository will be stored in a download folder when the following command is run:

./n3dr-linux backup -u admin -n http://localhost:8081 -r maven-releases

Backup all repositories

All artifacts from various repositories will be stored in a download folder when the following command is issued:

./n3dr-linux repositories -u admin -n http://localhost:8081 -b

Note: a new folder will be created for every repository:

download/maven-public
download/maven-releases

Backup only certain artifacts

It is possible to only download artifacts that match a regular expression. If one would like to download all artifacts from 'some/group42' then one could do that as follows:

./n3dr-linux backup -u admin -n http://localhost:8081 -r maven-releases -x 'some/group42'

If one would like to deploy is while download from all repositories then use the -x option as well:

./n3dr-linux repositories -u admin -n http://localhost:8081 -b -x 'some/group42'

Add all downloaded archives to a ZIP archive

In order to add all archives to a zip archive, one has to use the --zip or -z flag.

Upload all artifacts to a certain repository

It is possible to upload all JARs that reside in a folder by running the following command:

./n3dr-linux upload -u admin -n http://localhost:8081 -r maven-public

"Clone" a Nexus3 repository

Suppose that one has created a new Nexus3 repository, e.g. NexusNEW and that one would like to copy the content of the old repository, e.g. NexusOLD, then these basic steps could be issued to "clone" NexusOLD:

n3dr backup -u <old-nexus3-user> -n <old-nexus3-server-url> \
-r <old-repo-source-name>
cd download
mv <old-repo-source-name> <new-repo-target-name>
n3dr upload -u <new-target-nexus3-user> -n <new-target-nexus3-server-url> \
-r <new-repo-target-name>

Rationale for N3DR

Although there is a number of equivalent tools:

None of them seems to be able to backup all repositories by running a single command.

vsoloviov / n3dr