Index: head/sbin/bectl/bectl.8 =================================================================== --- head/sbin/bectl/bectl.8 (revision 343992) +++ head/sbin/bectl/bectl.8 (revision 343993) @@ -1,283 +1,291 @@ .\" .\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD .\" .\" Copyright (c) 2017 Kyle J. Kneitinger .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" .\" @(#)be.1 .\" .\" $FreeBSD$ .\" -.Dd December 25, 2018 +.Dd February 10, 2019 .Dt BECTL 8 .Os .Sh NAME .Nm bectl .Nd Utility to manage Boot Environments on ZFS .Sh SYNOPSIS .Nm .Cm activate .Op Fl t .Ar beName .Nm .Cm create .Op Fl r .Op Fl e Brq Ar nonActiveBe | beName@snapshot .Ar beName .Nm .Cm create .Op Fl r .Ar beName@snapshot .Nm .Cm destroy -.Op Fl F +.Op Fl \&Fo .Brq Ar beName | beName@snapshot .Nm .Cm export .Ar sourceBe .Nm .Cm import .Ar targetBe .Nm .Cm jail .Brq Fl b | Fl U .Oo Bro Fl o Ar key Ns = Ns Ar value | Fl u Ar key Brc Oc Ns ... .Ar bootenv .Op Ar utility Op Ar argument ... .Nm .Cm list .Op Fl DHas .Nm .Cm mount .Ar beName .Op mountpoint .Nm .Cm rename .Ar origBeName .Ar newBeName .Nm .Brq Cm ujail | unjail .Brq Ar jailID | jailName .Ar bootenv .Nm .Brq Cm umount | unmount .Op Fl f .Ar beName .Sh DESCRIPTION The .Nm command is used to setup and interact with ZFS boot environments, which are bootable clones of datasets. .Pp .Em Boot Environments allows the system to be upgraded, while preserving the old system environment in a separate ZFS dataset. .Sh COMMANDS The following commands are supported by .Nm : .Bl -tag -width activate .It Xo .Cm activate .Op Fl t .Ar beName .Xc Activate the given .Ar beName as the default boot filesystem. If the .Op Fl t flag is given, this takes effect only for the next boot. .It Xo .Cm create .Op Fl r .Op Fl e Brq Ar nonActiveBe | beName@snapshot .Ar beName .Xc Creates a new boot environment named .Ar beName . If the .Fl e argument is specified, the new environment will be cloned from the given .Brq Ar nonActiveBe | Ar beName@snapshot . If the .Fl r flag is given, a recursive boot environment will be made. .It Xo .Cm create .Op Fl r .Ar beName@snapshot .Xc Creates a snapshot of the existing boot environment named .Ar beName . If the .Fl r flag is given, a recursive boot environment will be made. .It Xo .Cm destroy -.Op Fl F +.Op Fl \&Fo .Brq Ar beName | beName@snapshot .Xc Destroys the given .Ar beName boot environment or .Ar beName@snapshot snapshot without confirmation, unlike in .Nm beadm . Specifying .Fl F will automatically unmount without confirmation. +.Pp +By default, +.Nm +will warn that it is not destroying the origin of +.Ar beName . +The +.Fl o +flag may be specified to destroy the origin as well. .It Cm export Ar sourceBe Export .Ar sourceBe to .Dv stdout . .Dv stdout must be piped or redirected to a file. .It Cm import Ar targetBe Import .Ar targetBe from .Dv stdin . .It Xo .Cm jail .Brq Fl b | Fl U .Oo Bro Fl o Ar key Ns = Ns Ar value | Fl u Ar key Brc Oc Ns ... .Ao Ar bootenv Ac .Op Ar utility Op Ar argument ... .Xc Creates a jail of the given boot environment. Multiple .Fl o and .Fl u arguments may be specified. .Fl o will set a jail parameter, and .Fl u will unset a jail parameter. .Pp By default, jails are created in interactive mode and .Pa /bin/sh is executed within the jail. If .Ar utility is specified, it will be executed instead of .Pa /bin/sh . The jail will be destroyed and the boot environment unmounted when the command finishes executing, unless the .Fl U argument is specified. .Pp The .Fl b argument enables batch mode, thereby disabling interactive mode. The .Fl U argument will be ignored in batch mode. .Pp The .Va name , .Va host.hostname , and .Va path must be set, the default values are specified below. .Pp All .Ar key Ns = Ns Ar value pairs are interpreted as jail parameters as described in .Xr jail 8 . The following default parameters are provided: .Bl -column "allow.mount.devfs" "" .It Va allow.mount Ta Cm true .It Va allow.mount.devfs Ta Cm true .It Va enforce_statfs Ta Cm 1 .It Va name Ta jail id .It Va host.hostname Ta Va bootenv .It Va path Ta Set to a path in /tmp generated by .Xr libbe 3 . .El .Pp All default parameters may be overwritten. .It Cm list Op Fl DHas Displays all boot environments. The Active field indicates whether the boot environment is active now (N); active on reboot (R); or both (NR). .Pp If .Fl a is used, display all datasets. If .Fl D is used, display the full space usage for each boot environment, assuming all other boot environments were destroyed. The .Fl H option is used for scripting. It does not print headers and separate fields by a single tab instead of arbitrary white space. If .Fl s is used, display all snapshots as well. .It Cm mount Ar beName Op Ar mountpoint Temporarily mount the boot environment. Mount at the specified .Ar mountpoint if provided. .It Cm rename Ar origBeName newBeName Renames the given .Ar origBeName to the given .Ar newBeName . The boot environment will not be unmounted in order for this rename to occur. .It Cm unjail Brq Ar jailID | jailName | beName Destroys the jail created from the given boot environment. .It Xo .Cm unmount .Op Fl f .Ar beName .Xc Unmount the given boot environment, if it is mounted. Specifying .Fl f will force the unmount if busy. .El .Sh EXAMPLES .Bl -bullet .It To fill in with jail upgrade example when behavior is firm. .El .Sh SEE ALSO .Xr libbe 3 , .Xr jail 8 , .Xr zfs 8 , .Xr zpool 8 .Sh HISTORY .Nm is based on .Nm beadm and was implemented as a project for the 2017 Summer of Code, along with .Xr libbe 3 . .Sh AUTHORS .Nm was written by .An Kyle Kneitinger (kneitinger) Aq Mt kyle@kneit.in . .Pp .Nm beadm was written and is maintained by .An Slawomir Wojciech Wojtczak (vermaden) Aq Mt vermaden@interia.pl . .Pp .An Bryan Drewery (bdrewery) Aq Mt bryan@shatow.net wrote the original .Nm beadm manual page that this one is derived from. Index: head/sbin/bectl/bectl.c =================================================================== --- head/sbin/bectl/bectl.c (revision 343992) +++ head/sbin/bectl/bectl.c (revision 343993) @@ -1,541 +1,561 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2017 Kyle J. Kneitinger * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include "bectl.h" static int bectl_cmd_activate(int argc, char *argv[]); static int bectl_cmd_create(int argc, char *argv[]); static int bectl_cmd_destroy(int argc, char *argv[]); static int bectl_cmd_export(int argc, char *argv[]); static int bectl_cmd_import(int argc, char *argv[]); #if SOON static int bectl_cmd_add(int argc, char *argv[]); #endif static int bectl_cmd_mount(int argc, char *argv[]); static int bectl_cmd_rename(int argc, char *argv[]); static int bectl_cmd_unmount(int argc, char *argv[]); libbe_handle_t *be; int usage(bool explicit) { FILE *fp; fp = explicit ? stdout : stderr; fprintf(fp, "%s", "usage:\tbectl {-h | -? | subcommand [args...]}\n" #if SOON "\tbectl add (path)*\n" #endif "\tbectl activate [-t] beName\n" "\tbectl create [-r] [-e {nonActiveBe | beName@snapshot}] beName\n" "\tbectl create [-r] beName@snapshot\n" "\tbectl destroy [-F] {beName | beName@snapshot}\n" "\tbectl export sourceBe\n" "\tbectl import targetBe\n" "\tbectl jail {-b | -U} [{-o key=value | -u key}]... " "{jailID | jailName}\n" "\t bootenv [utility [argument ...]]\n" "\tbectl list [-DHas]\n" "\tbectl mount beName [mountpoint]\n" "\tbectl rename origBeName newBeName\n" "\tbectl {ujail | unjail} {jailID | jailName} bootenv\n" "\tbectl {umount | unmount} [-f] beName\n"); return (explicit ? 0 : EX_USAGE); } /* * Represents a relationship between the command name and the parser action * that handles it. */ struct command_map_entry { const char *command; int (*fn)(int argc, char *argv[]); }; static struct command_map_entry command_map[] = { { "activate", bectl_cmd_activate }, { "create", bectl_cmd_create }, { "destroy", bectl_cmd_destroy }, { "export", bectl_cmd_export }, { "import", bectl_cmd_import }, #if SOON { "add", bectl_cmd_add }, #endif { "jail", bectl_cmd_jail }, { "list", bectl_cmd_list }, { "mount", bectl_cmd_mount }, { "rename", bectl_cmd_rename }, { "unjail", bectl_cmd_unjail }, { "unmount", bectl_cmd_unmount }, }; static int get_cmd_index(const char *cmd, int *idx) { int map_size; map_size = nitems(command_map); for (int i = 0; i < map_size; ++i) { if (strcmp(cmd, command_map[i].command) == 0) { *idx = i; return (0); } } return (1); } static int bectl_cmd_activate(int argc, char *argv[]) { int err, opt; bool temp; temp = false; while ((opt = getopt(argc, argv, "t")) != -1) { switch (opt) { case 't': temp = true; break; default: fprintf(stderr, "bectl activate: unknown option '-%c'\n", optopt); return (usage(false)); } } argc -= optind; argv += optind; if (argc != 1) { fprintf(stderr, "bectl activate: wrong number of arguments\n"); return (usage(false)); } /* activate logic goes here */ if ((err = be_activate(be, argv[0], temp)) != 0) /* XXX TODO: more specific error msg based on err */ printf("did not successfully activate boot environment %s\n", argv[0]); else printf("successfully activated boot environment %s\n", argv[0]); if (temp) printf("for next boot\n"); return (err); } /* * TODO: when only one arg is given, and it contains an "@" the this should * create that snapshot */ static int bectl_cmd_create(int argc, char *argv[]) { char *atpos, *bootenv, *snapname, *source; int err, opt; bool recursive; snapname = NULL; recursive = false; while ((opt = getopt(argc, argv, "e:r")) != -1) { switch (opt) { case 'e': snapname = optarg; break; case 'r': recursive = true; break; default: fprintf(stderr, "bectl create: unknown option '-%c'\n", optopt); return (usage(false)); } } argc -= optind; argv += optind; if (argc != 1) { fprintf(stderr, "bectl create: wrong number of arguments\n"); return (usage(false)); } bootenv = *argv; if ((atpos = strchr(bootenv, '@')) != NULL) { /* * This is the "create a snapshot variant". No new boot * environment is to be created here. */ *atpos++ = '\0'; err = be_snapshot(be, bootenv, atpos, recursive, NULL); } else if (snapname != NULL) { if (strchr(snapname, '@') != NULL) err = be_create_from_existing_snap(be, bootenv, snapname); else err = be_create_from_existing(be, bootenv, snapname); } else { if ((snapname = strchr(bootenv, '@')) != NULL) { *(snapname++) = '\0'; if ((err = be_snapshot(be, be_active_path(be), snapname, true, NULL)) != BE_ERR_SUCCESS) fprintf(stderr, "failed to create snapshot\n"); asprintf(&source, "%s@%s", be_active_path(be), snapname); err = be_create_from_existing_snap(be, bootenv, source); return (err); } else err = be_create(be, bootenv); } switch (err) { case BE_ERR_SUCCESS: break; default: if (atpos != NULL) fprintf(stderr, "failed to create a snapshot '%s' of '%s'\n", atpos, bootenv); else if (snapname == NULL) fprintf(stderr, "failed to create bootenv %s\n", bootenv); else fprintf(stderr, "failed to create bootenv %s from snapshot %s\n", bootenv, snapname); } return (err); } static int bectl_cmd_export(int argc, char *argv[]) { char *bootenv; if (argc == 1) { fprintf(stderr, "bectl export: missing boot environment name\n"); return (usage(false)); } if (argc > 2) { fprintf(stderr, "bectl export: extra arguments provided\n"); return (usage(false)); } bootenv = argv[1]; if (isatty(STDOUT_FILENO)) { fprintf(stderr, "bectl export: must redirect output\n"); return (EX_USAGE); } be_export(be, bootenv, STDOUT_FILENO); return (0); } static int bectl_cmd_import(int argc, char *argv[]) { char *bootenv; int err; if (argc == 1) { fprintf(stderr, "bectl import: missing boot environment name\n"); return (usage(false)); } if (argc > 2) { fprintf(stderr, "bectl import: extra arguments provided\n"); return (usage(false)); } bootenv = argv[1]; if (isatty(STDIN_FILENO)) { fprintf(stderr, "bectl import: input can not be from terminal\n"); return (EX_USAGE); } err = be_import(be, bootenv, STDIN_FILENO); return (err); } #if SOON static int bectl_cmd_add(int argc, char *argv[]) { if (argc < 2) { fprintf(stderr, "bectl add: must provide at least one path\n"); return (usage(false)); } for (int i = 1; i < argc; ++i) { printf("arg %d: %s\n", i, argv[i]); /* XXX TODO catch err */ be_add_child(be, argv[i], true); } return (0); } #endif static int bectl_cmd_destroy(int argc, char *argv[]) { - char *target; - int opt, err; - bool force; + nvlist_t *props; + char *origin, *target, targetds[BE_MAXPATHLEN]; + int err, flags, opt; - force = false; - while ((opt = getopt(argc, argv, "F")) != -1) { + flags = 0; + while ((opt = getopt(argc, argv, "Fo")) != -1) { switch (opt) { case 'F': - force = true; + flags |= BE_DESTROY_FORCE; break; + case 'o': + flags |= BE_DESTROY_ORIGIN; + break; default: fprintf(stderr, "bectl destroy: unknown option '-%c'\n", optopt); return (usage(false)); } } argc -= optind; argv += optind; if (argc != 1) { fprintf(stderr, "bectl destroy: wrong number of arguments\n"); return (usage(false)); } target = argv[0]; - err = be_destroy(be, target, force); + /* We'll emit a notice if there's an origin to be cleaned up */ + if ((flags & BE_DESTROY_ORIGIN) == 0 && strchr(target, '@') == NULL) { + if (be_root_concat(be, target, targetds) != 0) + goto destroy; + if (be_prop_list_alloc(&props) != 0) + goto destroy; + if (be_get_dataset_props(be, targetds, props) != 0) { + be_prop_list_free(props); + goto destroy; + } + if (nvlist_lookup_string(props, "origin", &origin) == 0) + fprintf(stderr, "bectl destroy: leaving origin '%s' intact\n", + origin); + be_prop_list_free(props); + } + +destroy: + err = be_destroy(be, target, flags); return (err); } static int bectl_cmd_mount(int argc, char *argv[]) { char result_loc[BE_MAXPATHLEN]; char *bootenv, *mountpoint; int err, mntflags; /* XXX TODO: Allow shallow */ mntflags = BE_MNT_DEEP; if (argc < 2) { fprintf(stderr, "bectl mount: missing argument(s)\n"); return (usage(false)); } if (argc > 3) { fprintf(stderr, "bectl mount: too many arguments\n"); return (usage(false)); } bootenv = argv[1]; mountpoint = ((argc == 3) ? argv[2] : NULL); err = be_mount(be, bootenv, mountpoint, mntflags, result_loc); switch (err) { case BE_ERR_SUCCESS: printf("successfully mounted %s at %s\n", bootenv, result_loc); break; default: fprintf(stderr, (argc == 3) ? "failed to mount bootenv %s at %s\n" : "failed to mount bootenv %s at temporary path %s\n", bootenv, mountpoint); } return (err); } static int bectl_cmd_rename(int argc, char *argv[]) { char *dest, *src; int err; if (argc < 3) { fprintf(stderr, "bectl rename: missing argument\n"); return (usage(false)); } if (argc > 3) { fprintf(stderr, "bectl rename: too many arguments\n"); return (usage(false)); } src = argv[1]; dest = argv[2]; err = be_rename(be, src, dest); switch (err) { case BE_ERR_SUCCESS: break; default: fprintf(stderr, "failed to rename bootenv %s to %s\n", src, dest); } return (0); } static int bectl_cmd_unmount(int argc, char *argv[]) { char *bootenv, *cmd; int err, flags, opt; /* Store alias used */ cmd = argv[0]; flags = 0; while ((opt = getopt(argc, argv, "f")) != -1) { switch (opt) { case 'f': flags |= BE_MNT_FORCE; break; default: fprintf(stderr, "bectl %s: unknown option '-%c'\n", cmd, optopt); return (usage(false)); } } argc -= optind; argv += optind; if (argc != 1) { fprintf(stderr, "bectl %s: wrong number of arguments\n", cmd); return (usage(false)); } bootenv = argv[0]; err = be_unmount(be, bootenv, flags); switch (err) { case BE_ERR_SUCCESS: break; default: fprintf(stderr, "failed to unmount bootenv %s\n", bootenv); } return (err); } int main(int argc, char *argv[]) { const char *command; char *root; int command_index, rc; root = NULL; if (argc < 2) return (usage(false)); if (strcmp(argv[1], "-r") == 0) { if (argc < 4) return (usage(false)); root = strdup(argv[2]); command = argv[3]; argc -= 3; argv += 3; } else { command = argv[1]; argc -= 1; argv += 1; } /* Handle command aliases */ if (strcmp(command, "umount") == 0) command = "unmount"; if (strcmp(command, "ujail") == 0) command = "unjail"; if ((strcmp(command, "-?") == 0) || (strcmp(command, "-h") == 0)) return (usage(true)); if (get_cmd_index(command, &command_index)) { fprintf(stderr, "unknown command: %s\n", command); return (usage(false)); } if ((be = libbe_init(root)) == NULL) return (-1); libbe_print_on_error(be, true); rc = command_map[command_index].fn(argc, argv); libbe_close(be); return (rc); }