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mount: use libmount to enumerate /proc/self/mountinfo

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This lets libmount add in user options from /run/mount/utab, like
_netdev which is needed to get proper ordering against remote-fs.target
This commit is contained in:
Chris Leech 2014-11-23 20:33:37 -08:00 committed by Zbigniew Jędrzejewski-Szmek
parent 8c8549db37
commit 8d3ae2bd4c
5 changed files with 45 additions and 37 deletions
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2
.travis.yml
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@ -3,7 +3,7 @@ compiler:
- gcc
before_install:
- sudo apt-get update -qq
- sudo apt-get install autotools-dev automake autoconf libtool libdbus-1-dev libcap-dev libblkid-dev libpam-dev libcryptsetup-dev libaudit-dev libacl1-dev libattr1-dev libselinux-dev liblzma-dev libgcrypt-dev libqrencode-dev libmicrohttpd-dev gtk-doc-tools gperf python2.7-dev
- sudo apt-get install autotools-dev automake autoconf libtool libdbus-1-dev libcap-dev libblkid-dev libmount-dev libpam-dev libcryptsetup-dev libaudit-dev libacl1-dev libattr1-dev libselinux-dev liblzma-dev libgcrypt-dev libqrencode-dev libmicrohttpd-dev gtk-doc-tools gperf python2.7-dev
script: ./autogen.sh && ./configure --enable-gtk-doc --enable-gtk-doc-pdf && make V=1 && sudo ./systemd-machine-id-setup && make check && make distcheck
after_failure: cat test-suite.log
notifications:

4
Makefile.am
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@ -1149,6 +1149,7 @@ libsystemd_core_la_CFLAGS = \
$(KMOD_CFLAGS) \
$(APPARMOR_CFLAGS) \
$(SECCOMP_CFLAGS) \
$(MOUNT_CFLAGS) \
-pthread
libsystemd_core_la_LIBADD = \
@ -1161,7 +1162,8 @@ libsystemd_core_la_LIBADD = \
$(AUDIT_LIBS) \
$(KMOD_LIBS) \
$(APPARMOR_LIBS) \
$(SECCOMP_LIBS)
$(SECCOMP_LIBS) \
$(MOUNT_LIBS)
if HAVE_SECCOMP
libsystemd_core_la_LIBADD += \

1
README
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@ -106,6 +106,7 @@ REQUIREMENTS:
glibc >= 2.14
libcap
libmount >= 2.20 (from util-linux)
libseccomp >= 1.0.0 (optional)
libblkid >= 2.20 (from util-linux) (optional)
libkmod >= 15 (optional)

10
configure.ac
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@ -438,6 +438,15 @@ if test "x$enable_blkid" != "xno"; then
fi
AM_CONDITIONAL(HAVE_BLKID, [test "$have_blkid" = "yes"])
# ------------------------------------------------------------------------------
have_libmount=no
PKG_CHECK_MODULES(MOUNT, [ mount >= 2.20 ],
[AC_DEFINE(HAVE_LIBMOUNT, 1, [Define if libmount is available]) have_libmount=yes], have_libmount=no)
if test "x$have_libmount" = xno; then
AC_MSG_ERROR([*** libmount support required but libraries not found])
fi
AM_CONDITIONAL(HAVE_LIBMOUNT, [test "$have_libmount" = "yes"])
# ------------------------------------------------------------------------------
have_seccomp=no
AC_ARG_ENABLE(seccomp, AS_HELP_STRING([--disable-seccomp], [Disable optional SECCOMP support]))
@ -1388,6 +1397,7 @@ AC_MSG_RESULT([
kmod: ${have_kmod}
xkbcommon: ${have_xkbcommon}
blkid: ${have_blkid}
libmount: ${have_libmount}
dbus: ${have_dbus}
nss-myhostname: ${have_myhostname}
gudev: ${enable_gudev}

65
src/core/mount.c
View File

@ -24,6 +24,7 @@
#include <mntent.h>
#include <sys/epoll.h>
#include <signal.h>
#include <libmount.h>
#include "manager.h"
#include "unit.h"
@ -1500,55 +1501,47 @@ fail:
return r;
}
static inline void mnt_free_table_p(struct libmnt_table **tb) {
mnt_free_table(*tb);
}
static inline void mnt_free_iter_p(struct libmnt_iter **itr) {
mnt_free_iter(*itr);
}
static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
_cleanup_(mnt_free_table_p) struct libmnt_table *tb = NULL;
_cleanup_(mnt_free_iter_p) struct libmnt_iter *itr = NULL;
struct libmnt_fs *fs;
int r = 0;
unsigned i;
assert(m);
rewind(m->proc_self_mountinfo);
tb = mnt_new_table();
itr = mnt_new_iter(MNT_ITER_FORWARD);
if (!tb || !itr)
return log_oom();
for (i = 1;; i++) {
_cleanup_free_ char *device = NULL, *path = NULL, *options = NULL, *options2 = NULL, *fstype = NULL, *d = NULL, *p = NULL, *o = NULL;
mnt_table_parse_mtab(tb, NULL);
if (r)
return r;
while (mnt_table_next_fs(tb, itr, &fs) == 0) {
const char *device, *path, *options, *fstype;
_cleanup_free_ const char *d = NULL, *p = NULL;
int k;
k = fscanf(m->proc_self_mountinfo,
"%*s " /* (1) mount id */
"%*s " /* (2) parent id */
"%*s " /* (3) major:minor */
"%*s " /* (4) root */
"%ms " /* (5) mount point */
"%ms" /* (6) mount options */
"%*[^-]" /* (7) optional fields */
"- " /* (8) separator */
"%ms " /* (9) file system type */
"%ms" /* (10) mount source */
"%ms" /* (11) mount options 2 */
"%*[^\n]", /* some rubbish at the end */
&path,
&options,
&fstype,
&device,
&options2);
if (k == EOF)
break;
if (k != 5) {
log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
continue;
}
o = strjoin(options, ",", options2, NULL);
if (!o)
return log_oom();
device = mnt_fs_get_source(fs);
path = mnt_fs_get_target(fs);
options = mnt_fs_get_options(fs);
fstype = mnt_fs_get_fstype(fs);
d = cunescape(device);
p = cunescape(path);
if (!d || !p)
return log_oom();
k = mount_add_one(m, d, p, o, fstype, set_flags);
k = mount_add_one(m, d, p, options, fstype, set_flags);
if (k < 0)
r = k;
}
@ -1585,6 +1578,8 @@ static int mount_enumerate(Manager *m) {
int r;
assert(m);
mnt_init_debug(0);
if (!m->proc_self_mountinfo) {
m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
if (!m->proc_self_mountinfo)