storage: Anaconda mode

doc/anaconda.md

@@ -0,0 +1,74 @@
+Cockpit Storage in Anaconda Mode
+================================
+
+Anaconda (the OS Installer) can open the Cockpit "storaged" page for
+advanced setup of the target storage devices. When this is done,
+storaged is in a special "Anaconda mode" and behaves significantly
+different.
+
+In essence, the storaged page restricts itself to working with the
+target environment. It will hide the real root filesystem (on the USB
+stick that the Live environment was booted from, say), but let the
+user create a "fake" root filesystem on some block device.
+
+Entering Anaconda mode
+----------------------
+
+The "storaged" page is put into Anaconda mode by storing a
+"cockpit_anaconda" item in its `window.localStorage`.  The value
+should be a JSON encoded object, the details of which are explained
+below.
+
+Since both Anaconda and the storaged page are served from the same
+origin, Anaconda can just execute something like this:
+
+```
+    window.localStorage.setItem("cockpit_anaconda",
+                                JSON.stringify({
+                                    "mount_point_prefix": "/sysroot",
+                                    "available_devices": [ "/dev/sda" ]
+                                }));
+    window.open("/cockpit/@localhost/storage/index.html", "storage-tab");
+```
+
+Ignoring storage devices
+------------------------
+
+Anaconda needs to tell Cockpit which devices can be used to install
+the OS on. This is done with the "available_devices" entry, which is
+an array of strings.
+
+```
+{
+  "available_devices": [ "/dev/sda" ]
+}
+```
+
+This list should only contain entries for top-level block devices. It
+should not contain things like partitions, device mapper devices, or
+mdraid devices.
+
+Mount point prefix
+------------------
+
+Cockpit can be put into a kind of "chroot" environment by giving it a
+mount point prefix like so:
+
+```
+{
+  "mount_point_prefix": "/sysroot"
+}
+```
+
+This works at the UI level: filesystems that have mount points outside
+of "/sysroot" are hidden from the user, and when letting the user work
+with mount points below "/sysroot", the "/sysroot" prefix is omitted
+in the UI. So when the user says to create a filesystem on "/var",
+they are actually creating one on "/sysroot/var".
+
+However, Cockpit (via UDisks2) will still write the new mount point
+configuration into the real /etc/fstab (_not_
+/sysroot/etc/fstab). This is done for the convenience of Cockpit, and
+Anaconda is not expected to read it.
+
+If and how Cockpit communicates back to Anaconda is still open.

pkg/storaged/anaconda.jsx

@@ -0,0 +1,28 @@
+/*
+ * This file is part of Cockpit.
+ *
+ * Copyright (C) 2023 Red Hat, Inc.
+ *
+ * Cockpit is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * Cockpit is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Cockpit; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import client from "./client.js";
+
+export const AnacondaAdvice = () => {
+    if (!client.in_anaconda_mode())
+        return null;
+
+    // Nothing yet.
+    return null;
+};

pkg/storaged/block/create-pages.jsx

@@ -106,5 +106,6 @@ export function make_block_page(parent, block, card) {
         }
     }
 
-    new_page(parent, card);
+    if (card)
+        new_page(parent, card);
 }

pkg/storaged/block/format-dialog.jsx

@@ -47,14 +47,19 @@ const _ = cockpit.gettext;
 export function initial_tab_options(client, block, for_fstab) {
     const options = { };
 
-    get_parent_blocks(client, block.path).forEach(p => {
-        // "nofail" is the default for new filesystems with Cockpit so
-        // that a failure to mount one of them will not prevent
-        // Cockpit from starting.  This allows people to debug and fix
-        // these failures with Cockpit itself.
-        //
+    // "nofail" is the default for new filesystems with Cockpit so
+    // that a failure to mount one of them will not prevent
+    // Cockpit from starting.  This allows people to debug and fix
+    // these failures with Cockpit itself.
+    //
+    // In Anaconda mode however, we don't make "nofail" the
+    // default since people will be creating the core filesystems
+    // like "/", "/var", etc.
+
+    if (!client.in_anaconda_mode())
         options.nofail = true;
 
+    get_parent_blocks(client, block.path).forEach(p => {
         if (is_netdev(client, p)) {
             options._netdev = true;
         }
@@ -142,10 +147,10 @@ export function format_dialog(client, path, start, size, enable_dos_extended) {
                     return false;
                 })
                 .then(version => {
-                    format_dialog_internal(client, path, start, size, enable_dos_extended, version);
+                    return format_dialog_internal(client, path, start, size, enable_dos_extended, version);
                 });
     } else {
-        format_dialog_internal(client, path, start, size, enable_dos_extended);
+        return format_dialog_internal(client, path, start, size, enable_dos_extended);
     }
 }
 
@@ -242,6 +247,10 @@ function format_dialog_internal(client, path, start, size, enable_dos_extended,
     if (old_opts == undefined)
         old_opts = initial_mount_options(client, block);
 
+    old_dir = client.strip_mount_point_prefix(old_dir);
+    if (old_dir === false)
+        return Promise.reject(_("This device can not be used for the installation target."));
+
     const split_options = parse_options(old_opts);
     extract_option(split_options, "noauto");
     const opt_ro = extract_option(split_options, "ro");
@@ -279,7 +288,10 @@ function format_dialog_internal(client, path, start, size, enable_dos_extended,
                           visible: is_filesystem,
                           value: old_dir || "",
                           validate: (val, values, variant) => {
-                              return is_valid_mount_point(client, block, val, variant == "nomount");
+                              return is_valid_mount_point(client,
+                                                          block,
+                                                          client.add_mount_point_prefix(val),
+                                                          variant == "nomount");
                           }
                       }),
             SelectOne("type", _("Type"),
@@ -474,6 +486,7 @@ function format_dialog_internal(client, path, start, size, enable_dos_extended,
                     if (mount_point != "") {
                         if (mount_point[0] != "/")
                             mount_point = "/" + mount_point;
+                        mount_point = client.add_mount_point_prefix(mount_point);
 
                         config_items.push(["fstab", {
                             dir: { t: 'ay', v: encode_filename(mount_point) },

pkg/storaged/block/other.jsx

@@ -19,12 +19,13 @@
 
 import cockpit from "cockpit";
 import React from "react";
+import client from "../client.js";
 
 import { DescriptionList } from "@patternfly/react-core/dist/esm/components/DescriptionList/index.js";
 import { CardBody } from "@patternfly/react-core/dist/esm/components/Card/index.js";
 
 import { StorageCard, StorageDescription, new_card } from "../pages.jsx";
-import { block_name } from "../utils.js";
+import { block_name, should_ignore } from "../utils.js";
 import { partitionable_block_actions } from "../partitions/actions.jsx";
 import { OtherIcon } from "../icons/gnome-icons.jsx";
 
@@ -33,6 +34,9 @@ import { make_block_page } from "../block/create-pages.jsx";
 const _ = cockpit.gettext;
 
 export function make_other_page(parent, block) {
+    if (should_ignore(client, block.path))
+        return;
+
     const other_card = new_card({
         title: _("Block device"),
         next: null,

pkg/storaged/client.js

@@ -741,6 +741,15 @@ function init_model(callback) {
         ).then(() => info);
     }
 
+    try {
+        client.anaconda = JSON.parse(window.localStorage.getItem("cockpit_anaconda"));
+    } catch {
+        console.warn("Can't parse cockpit_anaconda configuration as JSON");
+        client.anaconda = null;
+    }
+
+    console.log("ANACONDA", client.anaconda);
+
     pull_time().then(() => {
         read_os_release().then(os_release => {
             client.os_release = os_release;
@@ -1484,4 +1493,40 @@ client.get_config = (name, def) => {
     }
 };
 
+client.in_anaconda_mode = () => !!client.anaconda;
+
+client.strip_mount_point_prefix = (dir) => {
+    const mpp = client.anaconda?.mount_point_prefix;
+
+    if (dir && mpp) {
+        if (dir.indexOf(mpp) != 0)
+            return false;
+
+        dir = dir.substr(mpp.length);
+        if (dir == "")
+            dir = "/";
+    }
+
+    return dir;
+};
+
+client.add_mount_point_prefix = (dir) => {
+    const mpp = client.anaconda?.mount_point_prefix;
+    if (mpp && dir != "") {
+        if (dir == "/")
+            dir = mpp;
+        else
+            dir = mpp + dir;
+    }
+    return dir;
+};
+
+client.should_ignore_device = (devname) => {
+    return client.anaconda?.available_devices && client.anaconda.available_devices.indexOf(devname) == -1;
+};
+
+client.should_ignore_block = (block) => {
+    return client.should_ignore_device(utils.decode_filename(block.PreferredDevice));
+};
+
 export default client;

pkg/storaged/dialog.jsx

@@ -1107,7 +1107,8 @@ export const BlockingMessage = (usage) => {
         pvol: _("physical volume of LVM2 volume group"),
         "mdraid-member": _("member of MDRAID device"),
         vdo: _("backing device for VDO device"),
-        "stratis-pool-member": _("member of Stratis pool")
+        "stratis-pool-member": _("member of Stratis pool"),
+        mounted: _("Filesystem outside the target"),
     };
 
     const rows = [];
@@ -1197,9 +1198,15 @@ export const TeardownMessage = (usage, expect_single_unmount) => {
             const name = (fsys
                 ? fsys.Devnode
                 : block_name(client.blocks[use.block.CryptoBackingDevice] || use.block));
+            let location = use.location;
+            if (use.usage == "mounted") {
+                location = client.strip_mount_point_prefix(location);
+                if (location === false)
+                    location = _("(Not part of target)");
+            }
             rows.push({
                 columns: [name,
-                    use.location || "-",
+                    location || "-",
                     use.actions.length ? use.actions.join(", ") : "-",
                     {
                         title: <UsersPopover users={use.users || []} />,

pkg/storaged/drive/drive.jsx

@@ -27,7 +27,7 @@ import { Flex } from "@patternfly/react-core/dist/esm/layouts/Flex/index.js";
 
 import { HDDIcon, SSDIcon, MediaDriveIcon } from "../icons/gnome-icons.jsx";
 import { StorageCard, StorageDescription, new_card, new_page } from "../pages.jsx";
-import { block_name, drive_name, format_temperature, fmt_size_long } from "../utils.js";
+import { block_name, drive_name, format_temperature, fmt_size_long, should_ignore } from "../utils.js";
 import { make_block_page } from "../block/create-pages.jsx";
 import { partitionable_block_actions } from "../partitions/actions.jsx";
 
@@ -47,6 +47,9 @@ export function make_drive_page(parent, drive) {
     if (!block)
         return;
 
+    if (should_ignore(client, block.path))
+        return;
+
     let cls;
     if (client.drives_iscsi_session[drive.path])
         cls = "iscsi";

pkg/storaged/filesystem/filesystem.jsx

@@ -84,11 +84,13 @@ export function make_filesystem_card(next, backing_block, content_block, fstab_c
     const mounted = content_block && is_mounted(client, content_block);
 
     let mp_text;
-    if (mount_point && mounted)
-        mp_text = mount_point;
-    else if (mount_point && !mounted)
-        mp_text = mount_point + " " + _("(not mounted)");
-    else
+    if (mount_point) {
+        mp_text = client.strip_mount_point_prefix(mount_point);
+        if (mp_text == false)
+            return null;
+        if (!mounted)
+            mp_text = mp_text + " " + _("(not mounted)");
+    } else
         mp_text = _("(not mounted)");
 
     return new_card({

pkg/storaged/filesystem/mounting-dialog.jsx

@@ -47,6 +47,10 @@ export function mounting_dialog(client, block, mode, forced_options) {
     const [old_config, old_dir, old_opts, old_parents] = get_fstab_config(block, true);
     const options = old_config ? old_opts : initial_tab_options(client, block, true);
 
+    const old_dir_for_display = client.strip_mount_point_prefix(old_dir);
+    if (old_dir_for_display === false)
+        return Promise.reject(_("This device can not be used for the installation target."));
+
     const split_options = parse_options(options);
     extract_option(split_options, "noauto");
     const opt_never_auto = extract_option(split_options, "x-cockpit-never-auto");
@@ -198,8 +202,12 @@ export function mounting_dialog(client, block, mode, forced_options) {
         fields = [
             TextInput("mount_point", _("Mount point"),
                       {
-                          value: old_dir,
-                          validate: val => is_valid_mount_point(client, block, val, mode == "update" && !is_filesystem_mounted, true)
+                          value: old_dir_for_display,
+                          validate: val => is_valid_mount_point(client,
+                                                                block,
+                                                                client.add_mount_point_prefix(val),
+                                                                mode == "update" && !is_filesystem_mounted,
+                                                                true)
                       }),
             CheckBoxes("mount_options", _("Mount options"),
                        {
@@ -292,7 +300,7 @@ export function mounting_dialog(client, block, mode, forced_options) {
     const usage = get_active_usage(client, block.path);
 
     const dlg = dialog_open({
-        Title: cockpit.format(mode_title[mode], old_dir),
+        Title: cockpit.format(mode_title[mode], old_dir_for_display),
         Fields: fields,
         Teardown: TeardownMessage(usage, old_dir),
         update: function (dlg, vals, trigger) {
@@ -321,8 +329,10 @@ export function mounting_dialog(client, block, mode, forced_options) {
                         opts = opts.concat(forced_options);
                     if (vals.mount_options.extra !== false)
                         opts = opts.concat(parse_options(vals.mount_options.extra));
-                    return (maybe_update_config(vals.mount_point, unparse_options(opts),
-                                                vals.passphrase, passphrase_type)
+                    return (maybe_update_config(client.add_mount_point_prefix(vals.mount_point),
+                                                unparse_options(opts),
+                                                vals.passphrase,
+                                                passphrase_type)
                             .then(() => maybe_set_crypto_options(vals.mount_options.ro,
                                                                  opts.indexOf("noauto") == -1,
                                                                  vals.at_boot == "nofail",