dsarch
Python project to archive and maintain datasets for the NSF NCAR Geoscience Data Exchange (GDEX).
The user guide for this utility tool can be viewed at: User guide.
Code overview
The package is built around three Python modules in src/rda_python_dsarch/:
-
dsarch.py— Command-line entry point. DefinesDsArch, the action class that inherits fromPgArchandPgMeta. Its two driver methodsread_parameters()andstart_actions()parse the CLI and dispatch to the matching handler (archive, get, set, move, delete, restore) for web, saved, help, and Quasar-backup files, plus dataset, group, and version metadata. After the primary action, it also performs cross-cutting follow-up: dataset period updates, file-count resets (-WN/-WM/-RT), final logging, and optional email notification. -
pg_arch.py— Shared state and helpers. Defines thePgArchmixin (extendsPgOPT,PgCMD,PgSplitfromrda_python_common). Holds the masterOPTStable that maps short action codes (e.g.AW,GD,SG,RQ) to their bit flags, names, and write-mode levels; the runtime path cache (RTPATH,webpaths,savedpaths); and group-type/display-order caches. Provides the utility methods used across all actions: SQL condition building, path resolution, file-name validation, and dataset/ group metadata caching. -
pg_meta.py— File-count bookkeeping and metadata-XML queueing. Defines thePgMetamixin (extendsPgCMD,PgSplit). Tracks pending changes to per-dataset/per-group file counts inGCOUNTS(a 13-slot array covering MSS, web-D/N, and saved buckets) and flushes them to RDADB in batch. MaintainsMETA, a queue of metadata operations dispatched to the external toolsgatherxml,dcm,rcm,scm, andsml. Also providesswitch_logfile()for redirecting per-action log/error output.
The inheritance chain is DsArch -> PgArch -> PgMeta -> PgCMD/PgSplit, so
DsArch instances expose every option, path, count, and database helper
through a single object.
Environment setup
Create a Python environment first; package installs in the next section run inside whichever environment you activate here.
Option A — Python venv (DECS machines)
python3 -m venv $ENVHOME # e.g. /glade/u/home/gdexdata/gdexmsenv
source $ENVHOME/bin/activate
Option B — Conda (DAV/Casper)
conda create --prefix $ENVHOME python=3.12 # e.g. /glade/work/gdexdata/conda-envs/pg-gdex
conda activate $ENVHOME
Installing rda-python-dsarch
Pick whichever install mode fits your workflow. All four pull in the
transitive dependencies (rda_python_common, rda_python_setuid,
rda_python_miscs) automatically.
For local development, clone this repo alongside your project and install it in editable mode so that changes are picked up without re-installing:
git clone https://github.com/NCAR/rda-python-dsarch.git
cd rda-python-dsarch
pip install -e .
To test a specific branch (e.g. an in-progress feature or fix branch), pass
-b/--branch to git clone:
git clone -b <branch-name> https://github.com/NCAR/rda-python-dsarch.git
cd rda-python-dsarch
pip install -e .
For a regular (non-editable) install from a checkout:
pip install /path/to/rda-python-dsarch
For a production install on a system that uses the published distribution:
pip install rda_python_dsarch
Setuid Setup
dsarch is executed as the common user PGLOG['COMMONUSER'] (default
gdexdata) via the rda_python_setuid setuid mechanism, which is pulled
in automatically as a dependency. After pip install above, choose one
of the wiring options below.
Note: If
rda_python_setuidis already installed and fully set up in your environment, you can skip the compile step (-c/--compile) and the optionalpgstartstep (-p/--pgstart). The-l/--linkstep is still required to wire up this package's own setuid program.
Full setuid install (requires sudo access to COMMONUSER)
Run these steps once per environment:
# 1. Compile the pywrapper C binary (once per environment):
pywrapper-install -c|--compile -n|--username gdexdata
# 2. Wire up dsarch as a setuid entry (or use 'all' to link every setuid_* at once):
pywrapper-install -l|--link dsarch
pywrapper-install -l|--link all
# 3. Optionally, install a pgstart_<loginname> binary so <loginname> (any
# user in the same group as PGLOG['COMMONUSER']) can run commands as
# themselves. Run either by PGLOG['ADMINUSER'] (default zji, if it has
# 'sudo -u <loginname>'), or by <loginname> directly:
pywrapper-install -p|--pgstart -n|--username <loginname>
pywrapper-install with no arguments displays the full user guide.
Simple install (no sudo required, runs as current user)
Users who do not need the setuid mechanism can create a direct symlink instead:
pywrapper-install -l|--link dsarch -s|--simple
pywrapper-install -l|--link all -s|--simple # or link every setuid_* at once
This creates bin/dsarch -> bin/setuid_dsarch and the program runs as the
current user with no privilege change.
Update an existing installation (no sudo required)
When the package is upgraded and a new pywrapper.c is bundled, recompile and
reinstall all setuid binaries using the existing pgstart_* binaries:
pywrapper-install -u|--update
Setup guide
The shared setuid setup guide is shown automatically if setuid_dsarch is
invoked directly before the setuid wrapper has been configured.
Documentation sync
The user guide at
gdex-docs-dsarch.readthedocs.io is
generated from src/rda_python_dsarch/dsarch.usg. Keep all user-facing content
in dsarch.usg — no manual RST editing is required.
When a pull request modifying dsarch.usg is opened, an automated workflow
converts it into RST source files and the version number from this repository's
pyproject.toml into the
gdex-docs-dsarch repository, then
opens a pull request from automated-update-branch against its main branch for
review.
To publish to Read the Docs:
- Merge that pull request into
mainto serve the content as thelatestversion. - Create a GitHub release in
gdex-docs-dsarchto serve the latest release as thestableversion.
1 maintainer
Metadata
1 maintainer
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