Help understanding why execute.capture isn't capturing

[Rouneq]

I've searched around looking for examples of execute.capture on shell variables. To start, I'm trying to set a value of the home directory. I started with an example found here:

method.insert = completion_dirname, simple|private,
"execute.capture = bash, -c, "echo \"$1\" | tr -d '\\n'", completion_dirname, $d.get_finished_dir="

and modified it accordingly to

method.insert = cfg.home, string|const|private,"execute.capture = bash, -c, "echo $HOME""

Restarting rtorrent gives me "Junk at end of input". I didn't think this was right, but I tried it anyway. Changed it to

method.insert = cfg.home, string|const|private,"execute.capture = bash, -c, \"echo $HOME\""

With this, if I execute an rpc call with d.multicall2 '' default cfg.home=, I get

'execute.capture = bash, -c, "echo $HOME"' for each torrent.

What am I missing here?

[kannibalox]

string|const|private means that this command can only ever return a constant string, which is what you're seeing. You'd need to change it back to just string|private, but I'd recommend using system.env instead for this specific use case.

[Rouneq]

Hmm. Alright. I still think I'll need execute.capture or something isn't copacetic about system.env. HOME was just one value I'm after (which I pulled in via the change you mentioned above). I'm also looking for HOSTNAME and it's coming back as an empty string. But echo $HOSTNAME gives me the expected value. And making the call via execute.capture still just gives me 'execute.capture = bash, -c, "echo $HOSTNAME"' Thoughts?

[kannibalox]

The $HOSTNAME from bash is actually a shell variable and not environment variable (similar to how $RANDOM also looks like an environment variable but still returns a different value each time), while $HOME is typically set as a "real" environment variable on process start. I'd still recommend passing it in as a proper environment variable via your service manager and using system.env, but if that's not an option, something like this should work:

method.insert = cfg.home,  private|string, (execute.capture,bash,-c,"echo -n HOSTNAME")

Note that it runs execute.capture only once at start-up.

[Rouneq]

Awesome. That got me really close. I needed $HOSTNAME, but otherwise it picked up the value just fine.

I"m good with it capturing upon startup. That seems like expected behavior.

[Rouneq]

@kannibalox, if you'll indulge one more line of inquiry... :) Given

method.insert = cfg.user, private|string, (cat, (system.env, USER), "")
method.insert = cfg.host,  private|string, (execute.capture,bash,-c,"echo -n $HOSTNAME")
method.insert = cfg.home, private|string, (cat, (system.env, HOME), "")
method.insert = cfg.basedir,  private|string, (cat,(cfg.home),"/private/rtorrent/")

# API
network.scgi.open_local = <basedir>/private/rtorrent/.socket
# network.scgi.open_local = (cat, (cfg.basedir), ".socket")
execute2 = {sh,-c,/usr/bin/php <basedir>/www/<username>.<server>.feralhosting.com/public_html/rutorrent/php/initplugins.php <username> &}
# execute2 = {sh,-c,/usr/bin/php (cat, (cfg.home), "/www/", (cfg.user), ".", (cfg.host), ".feralhosting.com/public_html/rutorrent/php/initplugins.php") (cat, (cfg.user)) &}

where

rpc method.get '' cfg.basedir

results in

<basedir>/private/rtorrent/

If I use the line

# network.scgi.open_local = (cat, (cfg.basedir), ".socket")

rtorrent starts, but attempts to use rpc result in

ERROR:pyrosimple.scripts.rtxmlrpc.RtorrentXmlRpc:While calling method.get('', 'cfg.host') via <RTorrentProxy via xml for scgi+unix:///private/rtorrent/.socket>: [Errno 2] No such file or directory

It's like cfg.basedir isn't actually set (but getting the value indicates it is), thus making me believe I'm not using cat correctly here.

Restoring the first line back to the hard-coded path and using the line

execute2 = {sh,-c,/usr/bin/php (cat, (cfg.home), "/www/", (cfg.user), ".", (cfg.host), ".feralhosting.com/public_html/rutorrent/php/initplugins.php") (cat, (cfg.user)) &}

rtorrent won't start with the message

rtorrent: Error in option file: ~/.rtorrent.rc:14: Could not find closing '}'.

What's odd is I use these exact same new lines on another server and it works. I've pulled the lines from both configs and they match up. The only difference between the servers is the one that doesn't work is a new server I set up earlier today and it's not currently processing any torrents.

[kannibalox]

ERROR:pyrosimple.scripts.rtxmlrpc.RtorrentXmlRpc:While calling method.get('', 'cfg.host') via <RTorrentProxy via xml for scgi+unix:///private/rtorrent/.socket>: [Errno 2] No such file or directory

You're not doing anything wrong in the rtorrent.rc here, it's just that pyrosimple's connection auto-detection can't handle all the edge cases that could exist in rtorrent.rc. It should be able to handle nested cated cfg strings, but without replicating the full parsing engine it'll never be perfect. You can use the -U flag to set a connnection string manually, or set it in the config file: https://kannibalox.github.io/pyrosimple/configuration/#scgi_url-pyro_scgi_url

execute2 = {sh,-c,/usr/bin/php (cat, (cfg.home), "/www/", (cfg.user), ".", (cfg.host), ".feralhosting.com/public_html/rutorrent/php/initplugins.php") (cat, (cfg.user)) &}

rtorrent won't start with the message
rtorrent: Error in option file: ~/.rtorrent.rc:14: Could not find closing '}'.

This is another nesting issue, and the solution is probably more cfg. commands so that you can avoid having to use cat inside of the execute2 statement.