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126 lines
3.7 KiB
126 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later
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// Helper functions used to identify the boot device
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// adapted from /lib/functions.sh
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let cmdline_get_var = function(var) {
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let cmdline = fs.open("/proc/cmdline", "r");
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let allargs = cmdline.read("all");
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cmdline.close();
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let ret = null;
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for (let arg in split(allargs, /[ \t\n]/)) {
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let el = split(arg, "=");
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if (shift(el) == var)
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return join("=", el);
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}
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return ret;
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};
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// adapted from /lib/upgrade/common.sh
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let get_blockdevs = function() {
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let devs = [];
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for (let dev in fs.glob('/dev/*'))
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if (fs.stat(dev).type == "block")
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push(devs, split(dev, '/')[-1]);
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return devs;
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};
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// adapted from /lib/upgrade/common.sh
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let get_uevent_major_minor = function(file) {
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let uevf = fs.open(file, "r");
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if (!uevf)
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return null;
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let r = {};
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let evl;
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while ((evl = uevf.read("line"))) {
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let ev = split(evl, '=');
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if (ev[0] == "MAJOR")
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r.major = +ev[1];
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if (ev[0] == "MINOR")
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r.minor = +ev[1];
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}
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uevf.close();
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return r;
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};
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// adapted from /lib/upgrade/common.sh
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let get_bootdev = function(void) {
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let rootpart = cmdline_get_var("root");
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let uevent = null;
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if (wildcard(rootpart, "PARTUUID=[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-[a-f0-9][a-f0-9]")) {
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let uuidarg = split(substr(rootpart, 9), '-')[0];
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for (let bd in get_blockdevs()) {
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let bdf = fs.open(sprintf("/dev/%s", bd), "r");
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bdf.seek(440);
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let bduuid = bdf.read(4);
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bdf.close();
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if (uuidarg == sprintf("%x%x%x%x", ord(bduuid, 3), ord(bduuid, 2), ord(bduuid, 1), ord(bduuid, 0))) {
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uevent = sprintf("/sys/class/block/%s/uevent", bd);
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break;
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}
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}
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} else if (wildcard(rootpart, "PARTUUID=????????-????-????-????-??????????0?/PARTNROFF=*") ||
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wildcard(rootpart, "PARTUUID=????????-????-????-????-??????????02")) {
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let uuidarg = substr(split(substr(rootpart, 9), '/')[0], 0, -2) + "00";
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for (let bd in get_blockdevs()) {
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let bdf = fs.open(sprintf("/dev/%s", bd), "r");
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bdf.seek(568);
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let bduuid = bdf.read(16);
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bdf.close();
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if (!bduuid)
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continue;
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let uuid = sprintf("%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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ord(bduuid, 3), ord(bduuid, 2), ord(bduuid, 1), ord(bduuid, 0),
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ord(bduuid, 5), ord(bduuid, 4),
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ord(bduuid, 7), ord(bduuid, 6),
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ord(bduuid, 8), ord(bduuid, 9),
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ord(bduuid, 10), ord(bduuid, 11), ord(bduuid, 12), ord(bduuid, 13), ord(bduuid, 14), ord(bduuid, 15));
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if (uuidarg == uuid) {
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uevent = sprintf("/sys/class/block/%s/uevent", bd);
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break;
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}
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}
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} else if (wildcard(rootpart, "0x[a-f0-9][a-f0-9][a-f0-9]") ||
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wildcard(rootpart, "0x[a-f0-9][a-f0-9][a-f0-9][a-f0-9]") ||
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wildcard(rootpart, "[a-f0-9][a-f0-9][a-f0-9]") ||
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wildcard(rootpart, "[a-f0-9][a-f0-9][a-f0-9][a-f0-9]")) {
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let devid = rootpart;
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if (substr(devid, 0, 2) == "0x")
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devid = substr(devid, 2);
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devid = hex(devid);
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for (let bd in get_blockdevs()) {
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let r = get_uevent_major_minor(sprintf("/sys/class/block/%s/uevent", bd));
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if (r && (r.major == devid / 256) && (r.minor == devid % 256)) {
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uevent = sprintf("/sys/class/block/%s/../uevent", bd);
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break;
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}
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}
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} else if (wildcard(rootpart, "/dev/*")) {
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uevent = sprintf("/sys/class/block/%s/../uevent", split(rootpart, '/')[-1]);
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}
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return get_uevent_major_minor(uevent);
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};
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// adapted from /lib/upgrade/common.sh
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let get_partition = function(dev, num) {
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if (!dev)
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return null;
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for (let bd in get_blockdevs()) {
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let r = get_uevent_major_minor(sprintf("/sys/class/block/%s/uevent", bd));
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if (r.major == dev.major && r.minor == dev.minor + num) {
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return bd;
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break;
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}
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}
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return null;
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};
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blockdev_common = {};
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blockdev_common.get_partition = get_partition;
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blockdev_common.get_bootdev = get_bootdev;
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