Date: Tue, 25 Dec 2018 15:18:42 +0000 (UTC) From: Kyle Evans <kevans@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r342466 - in head/sbin/bectl: . tests Message-ID: <201812251518.wBPFIgos095766@repo.freebsd.org>
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Author: kevans Date: Tue Dec 25 15:18:41 2018 New Revision: 342466 URL: https://svnweb.freebsd.org/changeset/base/342466 Log: bectl: use jail id as the default jail name for a boot environment By default, bectl is setting the jail 'name' parameter to the boot environment name, which causes an error when the boot environment name is not a valid jail name. With the attached fix, when no name is supplied, the default jail name will be the jail id - this is is the same behavior as the jail command. Additionally, this commit addresses two other bugs that prevented unjailing in scenarios where the jail name does not match the boot environment name: 1. In 'bectl_locate_jail', 'mountpoint' is used to resolve the boot environment path, but really 'mounted' should be used. 'mountpoint' is the path where the zfs dataset will be mounted. 'mounted' is the path where the dataset is actually mounted. 2. in 'bectl_search_jail_paths', 'jail_getv' would fail after the first call. Which is fine, if the boot environment you're unjailing is the next one up. According to 'man jail_getv', it's expecting name and value strings. 'jail_getv' is being passed an integer for the lastjid, so amend that to use a string instead. Test cases have been amended to reflect the bugs found. PR: 233637 Submitted by: Rob <rob.fx907_gmail.com> MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D18607 Modified: head/sbin/bectl/bectl.8 head/sbin/bectl/bectl_jail.c head/sbin/bectl/tests/bectl_test.sh Modified: head/sbin/bectl/bectl.8 ============================================================================== --- head/sbin/bectl/bectl.8 Tue Dec 25 14:06:52 2018 (r342465) +++ head/sbin/bectl/bectl.8 Tue Dec 25 15:18:41 2018 (r342466) @@ -18,7 +18,7 @@ .\" .\" $FreeBSD$ .\" -.Dd November 21, 2018 +.Dd December 25, 2018 .Dt BECTL 8 .Os .Sh NAME @@ -52,7 +52,6 @@ .Cm jail .Brq Fl b | Fl U .Oo Bro Fl o Ar key Ns = Ns Ar value | Fl u Ar key Brc Oc Ns ... -.Brq Ar jailID | jailName .Ar bootenv .Op Ar utility Op Ar argument ... .Nm @@ -153,7 +152,6 @@ from .Cm jail .Brq Fl b | Fl U .Oo Bro Fl o Ar key Ns = Ns Ar value | Fl u Ar key Brc Oc Ns ... -.Brq Ar jailID | jailName .Ao Ar bootenv Ac .Op Ar utility Op Ar argument ... .Xc @@ -193,10 +191,7 @@ The .Va host.hostname , and .Va path -may not actually be unset. -Attempts to unset any of these will revert them to the default values specified -below, if they have been overwritten by -.Fl o . +must be set, the default values are specified below. .Pp All .Ar key Ns = Ns Ar value @@ -207,7 +202,7 @@ The following default parameters are provided: .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 Va bootenv +.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 . Modified: head/sbin/bectl/bectl_jail.c ============================================================================== --- head/sbin/bectl/bectl_jail.c Tue Dec 25 14:06:52 2018 (r342465) +++ head/sbin/bectl/bectl_jail.c Tue Dec 25 15:18:41 2018 (r342466) @@ -181,10 +181,10 @@ bectl_cmd_jail(int argc, char *argv[]) { char *bootenv, *mountpoint; int jid, opt, ret; - bool default_hostname, default_name, interactive, unjail; + bool default_hostname, interactive, unjail; pid_t pid; - default_hostname = default_name = interactive = unjail = true; + default_hostname = interactive = unjail = true; jpcnt = INIT_PARAMCOUNT; jp = malloc(jpcnt * sizeof(*jp)); if (jp == NULL) @@ -206,8 +206,6 @@ bectl_cmd_jail(int argc, char *argv[]) * optarg has been modified to null terminate * at the assignment operator. */ - if (strcmp(optarg, "name") == 0) - default_name = false; if (strcmp(optarg, "host.hostname") == 0) default_hostname = false; } @@ -217,8 +215,6 @@ bectl_cmd_jail(int argc, char *argv[]) break; case 'u': if ((ret = jailparam_delarg(optarg)) == 0) { - if (strcmp(optarg, "name") == 0) - default_name = true; if (strcmp(optarg, "host.hostname") == 0) default_hostname = true; } else if (ret != ENOENT) { @@ -259,8 +255,6 @@ bectl_cmd_jail(int argc, char *argv[]) return (1); } - if (default_name) - jailparam_add("name", bootenv); if (default_hostname) jailparam_add("host.hostname", bootenv); @@ -316,15 +310,23 @@ bectl_cmd_jail(int argc, char *argv[]) static int bectl_search_jail_paths(const char *mnt) { - char jailpath[MAXPATHLEN]; int jid; + char lastjid[16]; + char jailpath[MAXPATHLEN]; + /* jail_getv expects name/value strings */ + snprintf(lastjid, sizeof(lastjid), "%d", 0); + jid = 0; - (void)mnt; - while ((jid = jail_getv(0, "lastjid", &jid, "path", &jailpath, + while ((jid = jail_getv(0, "lastjid", lastjid, "path", &jailpath, NULL)) != -1) { + + /* the jail we've been looking for */ if (strcmp(jailpath, mnt) == 0) return (jid); + + /* update lastjid and keep on looking */ + snprintf(lastjid, sizeof(lastjid), "%d", jid); } return (-1); @@ -354,8 +356,11 @@ bectl_locate_jail(const char *ident) return (-1); if (nvlist_lookup_nvlist(belist, ident, &props) == 0) { - /* We'll attempt to resolve the jid by way of mountpoint */ - if (nvlist_lookup_string(props, "mountpoint", &mnt) == 0) { + + /* path where a boot environment is mounted */ + if (nvlist_lookup_string(props, "mounted", &mnt) == 0) { + + /* looking for a jail that matches our bootenv path */ jid = bectl_search_jail_paths(mnt); be_prop_list_free(belist); return (jid); Modified: head/sbin/bectl/tests/bectl_test.sh ============================================================================== --- head/sbin/bectl/tests/bectl_test.sh Tue Dec 25 14:06:52 2018 (r342465) +++ head/sbin/bectl/tests/bectl_test.sh Tue Dec 25 15:18:41 2018 (r342466) @@ -254,6 +254,14 @@ bectl_jail_body() atf_check cp /rescue/rescue ${root}/rescue/rescue atf_check bectl -r ${zpool}/ROOT umount default + # Prepare a second boot environment + atf_check -o empty -s exit:0 bectl -r ${zpool}/ROOT create -e default target + + # When a jail name is not explicit, it should match the jail id. + atf_check -o empty -s exit:0 bectl -r ${zpool}/ROOT jail -b -o jid=233637 default + atf_check -o inline:"233637\n" -s exit:0 -x "jls -j 233637 name" + atf_check -o empty -s exit:0 bectl -r ${zpool}/ROOT unjail default + # Basic command-mode tests, with and without jail cleanup atf_check -o inline:"rescue\n" bectl -r ${zpool}/ROOT \ jail default /rescue/rescue ls -1 @@ -271,6 +279,11 @@ bectl_jail_body() atf_check bectl -r ${zpool}/ROOT jail -b default atf_check bectl -r ${zpool}/ROOT unjail default atf_check -s not-exit:0 -x "jls | grep -F \"${root}\"" + # 'unjail' by BE name. Force bectl to lookup jail id by the BE name. + atf_check -o empty -s exit:0 bectl -r ${zpool}/ROOT jail -b default + atf_check -o empty -s exit:0 bectl -r ${zpool}/ROOT jail -b -o name=bectl_test target + atf_check -o empty -s exit:0 bectl -r ${zpool}/ROOT unjail target + atf_check -o empty -s exit:0 bectl -r ${zpool}/ROOT unjail default # cannot unjail an unjailed BE (by either command name) atf_check -e ignore -s not-exit:0 bectl -r ${zpool}/ROOT ujail default atf_check -e ignore -s not-exit:0 bectl -r ${zpool}/ROOT unjail default @@ -281,8 +294,24 @@ bectl_jail_body() atf_check -s not-exit:0 -x "mount | grep -F '${root}'" atf_check bectl -r ${zpool}/ROOT ujail default } + +# If a test has failed, it's possible that the boot environment hasn't +# been 'unjail'ed. We want to remove the jail before 'bectl_cleanup' +# attempts to destroy the zpool. bectl_jail_cleanup() { + for bootenv in "default" "target"; do + # mountpoint of the boot environment + mountpoint="$(bectl -r bectl_test/ROOT list -H | grep ${bootenv} | awk '{print $3}')" + + # see if any jail paths match the boot environment mountpoint + jailid="$(jls | grep ${mountpoint} | awk '{print $1}')" + + if [ -z "$jailid" ]; then + continue; + fi + jail -r ${jailid} + done; bectl_cleanup bectl_test }
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