I'm trying to build a local mirror of the ubuntu repository using aptly and I'm hitting an "operation not permitted" error at the point of publishing. Here is what I'm doing;
I've created 3 mirrors
$ aptly mirror create -with-udebs xenial \
http://archive.ubuntu.com/ubuntu xenial main universe multiverse
$ aptly mirror create -with-udebs xenial-updates \
http://archive.ubuntu.com/ubuntu xenial-updates main universe multiverse
$ aptly mirror create -with-udebs xenial-security \
http://archive.ubuntu.com/ubuntu xenial-security main universe multiverse
$ aptly mirror update xenial
$ aptly mirror update xenial-updates
$ aptly mirror update xenial-security
created 3 snapshots
$ aptly snapshot create snap-xenial from mirror xenial
$ aptly snapshot create snap-xenial-updates from mirror xenial-updates
$ aptly snapshot create snap-xenial-security from mirror xenial-security
merged them
$ aptly snapshot merge snap-merged snap-xenial snap-xenial-updates snap-xenial-security
and now I want to publish, which is where I hit the error
$ aptly publish snapshot -distribution=xenial snap-merged
Loading packages...
Generating metadata files and linking package files...
ERROR: unable to publish: unable to process packages: link /media/user/usbdrive/aplty/full/pool/00/6f/a3e766cc601510d78861ac2f15d2_0ad_0.0.20-1_amd64.deb /media/user/usbdrive/aplty/full/public/pool/main/0/0ad/0ad_0.0.20-1_amd64.deb: operation not permitted
My .aptly.conf file looks like this
{
"rootDir": "/media/user/usbdrive/aplty/full",
"downloadConcurrency": 4,
"downloadSpeedLimit": 0,
"architectures": ["amd64"],
"dependencyFollowSuggests": false,
"dependencyFollowRecommends": false,
"dependencyFollowAllVariants": false,
"dependencyFollowSource": false,
"dependencyVerboseResolve": false,
"gpgDisableSign": false,
"gpgDisableVerify": false,
"gpgProvider": "gpg",
"downloadSourcePackages": false,
"skipLegacyPool": true,
"ppaDistributorID": "ubuntu",
"ppaCodename": "",
"skipContentsPublishing": false,
"FileSystemPublishEndpoints": {},
"S3PublishEndpoints": {},
"SwiftPublishEndpoints": {}
}
I've looked at the permisions on the directories and they look ok
$ ls -al /media/user/usbdrive/aplty/full/public/pool/main/0/0ad/
total 64
drwxr-xr-x 2 user user 32768 Aug 19 20:29 .
drwxr-xr-x 3 user user 32768 Aug 19 20:29 ..
I'm on ubuntu 16.04 and I am using an external drive with a fat32 partition over thunderbolt3 to store the files. And I know that there is a aplty/aptly typo in the path but I don't believe that is the problem.
I'd really appreciate some pointers on what I'm doing wrong or how else to debug this. Thanks.