libbe(3)/bectl(8): Make consistent with beadm

vermaden (maintainer of beadm) points out the following inconsistencies:
- "missing command" is not printed prior to usage if the error is simply a
   missing command; this should be obvious from the context
- "bectl rename" isn't using the "don't unmount" flag (zfs rename -u), so
   the active BE can't be renamed. It doesn't make sense in our context to
   *not* use -u, so use it.

Documentation updates reflect the above and note an inconsistency with the
'destroy' command that is consistent with other parts of the base system.

A fix for libbe(3) not properly being installed to /lib is included.
SHLIBDIR should have been added when it was moved in r337995.

Approved by:	re (kib)

ObsoleteFiles.inc

@@ -38,6 +38,8 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20180824: libbe(3) SHLIBDIR fixed to reflect correct location
+OLD_LIBS+=usr/lib/libbe.so.1
 # 20180819: Remove deprecated arc4random(3) stir/addrandom interfaces
 OLD_FILES+=usr/share/man/man3/arc4random_addrandom.3.gz
 OLD_FILES+=usr/share/man/man3/arc4random_stir.3.gz

lib/libbe/Makefile

@@ -2,6 +2,7 @@
 
 PACKAGE=	lib${LIB}
 LIB=		be
+SHLIBDIR?= /lib
 SHLIB_MAJOR=	1
 SHLIB_MINOR=	0
 

lib/libbe/be.c

@@ -623,10 +623,6 @@ be_rename(libbe_handle_t *lbh, const char *old, const char *new)
 	if ((err = be_root_concat(lbh, new, full_new)) != 0)
 		return (set_error(lbh, err));
 
-	/* Check if old is active BE */
-	if (strcmp(full_old, be_active_path(lbh)) == 0)
-		return (set_error(lbh, BE_ERR_MOUNTED));
-
 	if (!zfs_dataset_exists(lbh->lzh, full_old, ZFS_TYPE_DATASET))
 		return (set_error(lbh, BE_ERR_NOENT));
 
@@ -637,14 +633,10 @@ be_rename(libbe_handle_t *lbh, const char *old, const char *new)
 	    ZFS_TYPE_FILESYSTEM)) == NULL)
 		return (set_error(lbh, BE_ERR_ZFSOPEN));
 
-	/* XXX TODO: Allow a force flag */
-	if (zfs_is_mounted(zfs_hdl, NULL)) {
-		zfs_close(zfs_hdl);
-		return (set_error(lbh, BE_ERR_MOUNTED));
-	}
-
 	/* recurse, nounmount, forceunmount */
-	struct renameflags flags = { 0, 0, 0 };
+	struct renameflags flags = {
+		.nounmount = 1,
+	};
 
 	err = zfs_rename(zfs_hdl, NULL, full_new, flags);
 

lib/libbe/libbe.3

@@ -28,7 +28,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd August 16, 2018
+.Dd August 24, 2018
 .Dt LIBBE 3
 .Os
 .Sh NAME
@@ -222,7 +222,12 @@ snapshot.
 .Pp
 The
 .Fn be_rename
-function renames a boot environment.
+function renames a boot environment without unmounting it, as if renamed with
+the
+.Fl u
+argument were passed to
+.Nm zfs
+.Cm rename
 .Pp
 The
 .Fn be_activate

sbin/bectl/bectl.8

@@ -18,7 +18,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd August 22, 2018
+.Dd August 24, 2018
 .Dt BECTL 8
 .Os
 .Sh NAME
@@ -132,7 +132,8 @@ Destroys the given
 .Ar beName
 boot environment or
 .Ar beName@snapshot
-snapshot.
+snapshot without confirmation, unlike in
+.Nm beadm .
 Specifying
 .Fl F
 will automatically unmount without confirmation.
@@ -239,10 +240,11 @@ Mount at the specified
 .Ar mountpoint
 if provided.
 .It Cm rename Ar origBeName newBeName
-Renames the given nonactive
+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

sbin/bectl/bectl.c

@@ -491,10 +491,8 @@ main(int argc, char *argv[])
 	const char *command;
 	int command_index, rc;
 
-	if (argc < 2) {
-		fprintf(stderr, "missing command\n");
+	if (argc < 2)
 		return (usage(false));
-	}
 
 	command = argv[1];
 

tools/build/mk/OptionalObsoleteFiles.inc

@@ -1288,7 +1288,7 @@ OLD_FILES+=usr/bin/ztest
 OLD_FILES+=usr/lib/libbe.a
 OLD_FILES+=usr/lib/libbe_p.a
 OLD_FILES+=usr/lib/libbe.so
-OLD_LIBS+=usr/lib/libbe.so.1
+OLD_LIBS+=lib/libbe.so.1
 OLD_FILES+=usr/lib/libzfs.a
 OLD_LIBS+=usr/lib/libzfs.so
 OLD_FILES+=usr/lib/libzfs_core.a