# Appendix G - S3QL


The code is perhaps the least-referenced open-source S3 gateway package, and from a vanilla RHEL 7.3 build we had to add a significant number of packages to get to the utility compiled and installed.
S3QL is written in Python.
Significant additions are required to build S3QL namely: llfuse, Python3, Cython, Python-pip, EPEL and SQlite.

S3QL uses the Python bindings (llfuse) to the Linux user-mode kernel FUSE layer.
By default, it uses the POSIX handle mapped as an S3 object in a one-to-one map.
S3QL supports only one node sharing one subset (directory) tree of one S3 bucket.
There is no sharing in this model.

Several code exception/faults were seen in Python subroutines of the
`mkfs.s3ql` utility during initial test so, due to time pressures, we
will revisit this later.

Although the process exceptions are probably due to a build error, and plainly the product does work, this does highlight that the build process was unusually complex, due to the nature of so many dependencies on other open-source components.
This may play as a factor in the decision process for selecting solutions.


[S3FS](s3fs.md)[ObjectiveFS](objectivefs.md)