tobias opened a new issue, #720:
URL: https://github.com/apache/maven-indexer/issues/720
### Affected version
7.1.6
### Bug description
When running the CLI with:
```shell
java -jar indexer-cli-7.1.6-cli.jar \
--name clojars \
--type min \
--index ./index \
--destination ./repo/.index \
--repository ./repo \
--checksums \
--quiet \
--chunks \
--keep 50
```
It runs successfully on the first run (when `./index` is empty). On a
subsequent run, it fails with:
```
java.io.IOException: Error scanning context clojars:
java.nio.file.FileAlreadyExistsException:
/tmp/clojars-tmp10757666929368582455/nexus-maven-repository-index-packer.properties
at
org.apache.maven.index.DefaultNexusIndexer.scan(DefaultNexusIndexer.java:313)
at
org.apache.maven.index.DefaultNexusIndexer.scan(DefaultNexusIndexer.java:258)
at
org.apache.maven.index.cli.NexusIndexerCli.index(NexusIndexerCli.java:448)
at
org.apache.maven.index.cli.NexusIndexerCli.execute(NexusIndexerCli.java:164)
at
org.apache.maven.index.cli.NexusIndexerCli.main(NexusIndexerCli.java:116)
Caused by: java.nio.file.FileAlreadyExistsException:
/tmp/clojars-tmp10757666929368582455/nexus-maven-repository-index-packer.properties
at
java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:94)
at
java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
at
java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
at
java.base/sun.nio.fs.UnixFileSystemProvider.newFileChannel(UnixFileSystemProvider.java:213)
at
java.base/sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:244)
at
java.base/java.nio.file.spi.FileSystemProvider.newOutputStream(FileSystemProvider.java:426)
at java.base/java.nio.file.Files.newOutputStream(Files.java:215)
at
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:394)
at
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:387)
at
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:220)
at org.apache.lucene.store.Directory.copyFrom(Directory.java:181)
at
org.apache.maven.index.context.IndexUtils.copyFile(IndexUtils.java:73)
at
org.apache.maven.index.context.IndexUtils.copyFile(IndexUtils.java:63)
at
org.apache.maven.index.context.IndexUtils.copyDirectory(IndexUtils.java:56)
at
org.apache.maven.index.DefaultNexusIndexer.scan(DefaultNexusIndexer.java:291)
... 4 more
```
Removing `./index/nexus-maven-repository-index-packer.properties` allows the
subsequent run to succeed.
I encountered this when attempting to upgrade clojars.org from `4.1.2` to
`7.1.6`.
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