4146029bb3
This more closely matches the behavior for beadm. The associated libbe(3) API is still getting worked out a little bit.
268 lines
6.3 KiB
C
268 lines
6.3 KiB
C
/*
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* be_info.c
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*
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* Copyright (c) 2017 Kyle J. Kneitinger <kyle@kneit.in>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "be.h"
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#include "be_impl.h"
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/*
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* Returns the name of the active boot environment
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*/
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const char *
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be_active_name(libbe_handle_t *lbh)
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{
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return (strrchr(lbh->rootfs, '/') + sizeof(char));
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}
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/*
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* Returns full path of the active boot environment
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*/
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const char *
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be_active_path(libbe_handle_t *lbh)
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{
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return (lbh->rootfs);
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}
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/*
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* Returns the name of the next active boot environment
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*/
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const char *
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be_nextboot_name(libbe_handle_t *lbh)
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{
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return (strrchr(lbh->bootfs, '/') + sizeof(char));
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}
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/*
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* Returns full path of the active boot environment
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*/
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const char *
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be_nextboot_path(libbe_handle_t *lbh)
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{
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return (lbh->bootfs);
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}
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/*
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* Returns the path of the boot environment root dataset
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*/
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const char *
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be_root_path(libbe_handle_t *lbh)
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{
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return (lbh->root);
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}
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/*
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* Populates dsnvl with one nvlist per bootenv dataset describing the properties
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* of that dataset that we've declared ourselves to care about.
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*/
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int
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be_get_bootenv_props(libbe_handle_t *lbh, nvlist_t *dsnvl)
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{
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prop_data_t data;
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data.lbh = lbh;
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data.list = dsnvl;
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data.single_object = false;
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return (prop_list_builder(&data));
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}
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int
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be_get_snapshot_props(libbe_handle_t *lbh, const char *name, nvlist_t *props)
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{
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zfs_handle_t *snap_hdl;
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prop_data_t data;
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int ret;
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data.lbh = lbh;
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data.list = props;
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data.single_object = true;
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if ((snap_hdl = zfs_open(lbh->lzh, name,
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ZFS_TYPE_SNAPSHOT)) == NULL)
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return (BE_ERR_ZFSOPEN);
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ret = prop_list_builder_cb(snap_hdl, &data);
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zfs_close(snap_hdl);
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return (ret);
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}
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/*
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* Internal callback function used by zfs_iter_filesystems. For each dataset in
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* the bootenv root, populate an nvlist_t of its relevant properties.
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* TODO: should any other properties be included?
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*/
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int
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prop_list_builder_cb(zfs_handle_t *zfs_hdl, void *data_p)
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{
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char buf[512], *mountpoint;
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prop_data_t *data;
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libbe_handle_t *lbh;
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nvlist_t *props;
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const char *dataset, *name;
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boolean_t mounted;
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/*
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* XXX TODO:
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* some system for defining constants for the nvlist keys
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* error checking
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*/
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data = (prop_data_t *)data_p;
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lbh = data->lbh;
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if (data->single_object)
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props = data->list;
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else
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nvlist_alloc(&props, NV_UNIQUE_NAME, KM_SLEEP);
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dataset = zfs_get_name(zfs_hdl);
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nvlist_add_string(props, "dataset", dataset);
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name = strrchr(dataset, '/') + 1;
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nvlist_add_string(props, "name", name);
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mounted = zfs_is_mounted(zfs_hdl, &mountpoint);
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nvlist_add_boolean_value(props, "mounted", mounted);
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if (mounted)
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nvlist_add_string(props, "mountpoint", mountpoint);
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if (zfs_prop_get(zfs_hdl, ZFS_PROP_ORIGIN, buf, 512,
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NULL, NULL, 0, 1) == 0)
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nvlist_add_string(props, "origin", buf);
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if (zfs_prop_get(zfs_hdl, ZFS_PROP_CREATION, buf, 512,
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NULL, NULL, 0, 1) == 0)
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nvlist_add_string(props, "creation", buf);
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nvlist_add_boolean_value(props, "active",
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(strcmp(be_active_path(lbh), dataset) == 0));
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if (zfs_prop_get(zfs_hdl, ZFS_PROP_USED, buf, 512,
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NULL, NULL, 0, 1) == 0)
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nvlist_add_string(props, "used", buf);
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if (zfs_prop_get(zfs_hdl, ZFS_PROP_USEDDS, buf, 512,
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NULL, NULL, 0, 1) == 0)
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nvlist_add_string(props, "usedds", buf);
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if (zfs_prop_get(zfs_hdl, ZFS_PROP_USEDSNAP, buf, 512,
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NULL, NULL, 0, 1) == 0)
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nvlist_add_string(props, "usedsnap", buf);
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if (zfs_prop_get(zfs_hdl, ZFS_PROP_USEDREFRESERV, buf, 512,
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NULL, NULL, 0, 1) == 0)
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nvlist_add_string(props, "usedrefreserv", buf);
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if (zfs_prop_get(zfs_hdl, ZFS_PROP_REFERENCED, buf, 512,
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NULL, NULL, 0, 1) == 0)
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nvlist_add_string(props, "referenced", buf);
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nvlist_add_boolean_value(props, "nextboot",
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(strcmp(be_nextboot_path(lbh), dataset) == 0));
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if (!data->single_object)
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nvlist_add_nvlist(data->list, name, props);
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return (0);
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}
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/*
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* Updates the properties of each bootenv in the libbe handle
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* XXX TODO: rename to be_proplist_update
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* XXX TODO: ensure that this is always consistent (run after adds, deletes,
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* renames,etc
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*/
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int
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prop_list_builder(prop_data_t *data)
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{
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zfs_handle_t *root_hdl;
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if ((root_hdl = zfs_open(data->lbh->lzh, data->lbh->root,
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ZFS_TYPE_FILESYSTEM)) == NULL)
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return (BE_ERR_ZFSOPEN);
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/* XXX TODO: some error checking here */
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zfs_iter_filesystems(root_hdl, prop_list_builder_cb, data);
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zfs_close(root_hdl);
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return (0);
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}
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int
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be_prop_list_alloc(nvlist_t **be_list)
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{
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return (nvlist_alloc(be_list, NV_UNIQUE_NAME, KM_SLEEP));
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}
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/*
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* frees property list and its children
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*/
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void
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be_prop_list_free(nvlist_t *be_list)
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{
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nvlist_t *prop_list;
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nvpair_t *be_pair;
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be_pair = nvlist_next_nvpair(be_list, NULL);
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if (nvpair_value_nvlist(be_pair, &prop_list) == 0)
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nvlist_free(prop_list);
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while ((be_pair = nvlist_next_nvpair(be_list, be_pair)) != NULL) {
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if (nvpair_value_nvlist(be_pair, &prop_list) == 0)
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nvlist_free(prop_list);
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}
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}
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/*
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* Usage
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*/
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bool
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be_exists(libbe_handle_t *lbh, char *be)
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{
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char buf[BE_MAXPATHLEN];
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be_root_concat(lbh, be, buf);
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/*
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* XXX TODO: check mountpoint prop and see if its /, AND that result
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* with below expression.
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*/
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return (zfs_dataset_exists(lbh->lzh, buf, ZFS_TYPE_DATASET));
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}
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