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130 lines
3.3 KiB
130 lines
3.3 KiB
#!/usr/bin/ucode -R
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// SPDX-License-Identifier: GPL-2.0-or-later
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// uvol - storage volume manager for OpenWrt
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// (c) 2022 Daniel Golle <daniel@makrotopia.org>
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let help_output = "uvol storage volume manager
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syntax: uvol command ...
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commands:
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boot get active volumes ready (called on boot)
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free show number of bytes available
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total show total number of bytes
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align show sector size in bytes
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list [volname] list volumes
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create volname size type create new volume
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size: in bytes
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type: 'ro' or 'rw'
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remove volname delete volume
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device volname show block device for mounting
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size volname show size of volume
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up volname get volume ready for mounting
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down volname take volume down after unmounting
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status volname return status of volume
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return code: 0 - volume is ready for use
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1 - volume is not ready for use
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2 - volume doesn't exist
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write volname size write to volume from stdin, size in bytes
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";
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let fs = require("fs");
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let uci = require("uci");
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let cursor = uci ? uci.cursor() : null;
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let ctx = {};
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ctx.cursor = cursor;
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ctx.fs = fs;
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include("/usr/lib/uvol/uci.uc");
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ctx.uci_add = uvol_uci.uvol_uci_add;
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ctx.uci_remove = uvol_uci.uvol_uci_remove;
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ctx.uci_commit = uvol_uci.uvol_uci_commit;
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ctx.uci_init = uvol_uci.uvol_uci_init;
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let backend = null;
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let tried_backends = [];
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for (plugin in fs.glob("/usr/lib/uvol/backends/*.uc")) {
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let current_backend = {};
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include(plugin, { backend: current_backend });
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push(tried_backends, current_backend.backend);
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if (type(backend) == "object" &&
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type(backend.priority) == "int" &&
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type(current_backend.priority) == "int" &&
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backend.priority > current_backend.priority)
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continue;
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if (type(current_backend.init) == "function" &&
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current_backend.init(ctx)) {
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backend = current_backend;
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break;
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}
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}
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if (!backend) {
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printf("No backend available. (tried: %s)\n", join(" ", tried_backends));
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printf("To setup devices with block storage install 'autopart'.\n");
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exit(2);
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}
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// The below code is needed as older versions of ucode pass the complete cmdline via ARGV
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// Once we can rely in more recent ucode the while loop can be replaced by simply
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// let cmd = shift(ARGV);
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let skip = null;
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let cmd = null;
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let skip_argv = ["/usr/bin/ucode", "-R", "/usr/sbin/uvol"];
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while (skip = shift(ARGV)) {
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if (skip != shift(skip_argv)) {
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cmd = skip;
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break;
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}
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}
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if (!cmd || cmd == "-h" || cmd == "help") {
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printf("%s", help_output);
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return cmd?0:22;
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}
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if (!(cmd in keys(backend))) {
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printf("command %s not found\n", cmd);
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return 22;
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}
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let json_output = false;
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if (ARGV[0] == "-j") {
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json_output = true;
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shift(ARGV);
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}
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let legacy_output = function(var) {
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let out = "";
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if (type(var) == "array") {
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for (let line in var) {
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out += join(" ", values(line));
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out += "\n";
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}
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} else if (type(var) == "object") {
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out += join(" ", values(var));
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out += "\n";
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} else if (type(var) == "string") {
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out += var;
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out += "\n";
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}
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return out;
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};
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if (type(backend[cmd]) == "function") {
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let ret = backend[cmd](...ARGV);
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if (type(ret) == "int") {
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exit(ret);
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} else {
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if (json_output)
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printf("%.J\n", ret);
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else
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printf("%s", legacy_output(ret));
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}
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} else {
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if (json_output)
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printf("%.J\n", backend[cmd]);
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else
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printf("%s\n", legacy_output(backend[cmd]));
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}
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exit(0);
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