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static-nodes: move creation of static nodes from udevd to tmpfiles
As of kmod v14, it is possible to export the static node information from
/lib/modules/`uname -r`/modules.devname in tmpfiles.d(5) format.
Use this functionality to let systemd-tmpfilesd create the static device nodes
at boot, and drop the functionality from systemd-udevd.
As an effect of this we can move from systemd-udevd to systemd-tmpfiles-setup-dev:
* the conditional CAP_MKNOD (replaced by checking if /sys is mounted rw)
* ordering before local-fs-pre.target (see 89d09e1b5c)
This commit is contained in:
Tom Gundersen
parent
fec79699da
commit
edeb68c53f
11
Makefile.am
11
Makefile.am
@ -1464,10 +1464,18 @@ nodist_systemunit_DATA += \
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SYSINIT_TARGET_WANTS += \
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systemd-modules-load.service
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if ENABLE_TMPFILES
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nodist_systemunit_DATA += \
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units/kmod-static-nodes.service
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SYSINIT_TARGET_WANTS += \
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kmod-static-nodes.service
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endif
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endif
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EXTRA_DIST += \
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units/systemd-modules-load.service.in
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units/systemd-modules-load.service.in \
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units/kmod-static-nodes.service.in
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# ------------------------------------------------------------------------------
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if ENABLE_TMPFILES
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@ -4137,6 +4145,7 @@ substitutions = \
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'|SUSHELL=$(SUSHELL)|' \
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'|DEBUGTTY=$(DEBUGTTY)|' \
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'|KILL=$(KILL)|' \
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'|KMOD=$(KMOD)|' \
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'|QUOTAON=$(QUOTAON)|' \
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'|QUOTACHECK=$(QUOTACHECK)|' \
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'|SYSTEM_SYSVINIT_PATH=$(sysvinitdir)|' \
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4
TODO
4
TODO
@ -186,10 +186,6 @@ Features:
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so that the coredump is properly written to the user's own journal
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file.
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* move /usr/lib/modules/$(uname -r)/modules.devname parsing from udevd to
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kmod static-nodes
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call kmod as an early service, and drop CAP_MKNOD from udevd.service
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* seems that when we follow symlinks to units we prefer the symlink
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destination path over /etc and /usr. We shouldn't do that. Instead
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/etc should always override /run+/usr and also any symlink
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@ -74,6 +74,8 @@ AC_PATH_PROG([SETCAP], [setcap], [/usr/sbin/setcap])
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AC_PATH_PROG([KILL], [kill], [/usr/bin/kill])
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AC_PATH_PROG([KMOD], [kmod], [/usr/bin/kmod])
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# gtkdocize greps for '^GTK_DOC_CHECK', so it needs to be on its own line
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m4_ifdef([GTK_DOC_CHECK], [
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GTK_DOC_CHECK([1.18],[--flavour no-tmpl])],
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@ -216,7 +218,7 @@ PKG_CHECK_MODULES(DBUS, [dbus-1 >= 1.3.2])
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have_kmod=no
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AC_ARG_ENABLE(kmod, AS_HELP_STRING([--disable-kmod], [disable loadable modules support]))
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if test "x$enable_kmod" != "xno"; then
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PKG_CHECK_MODULES(KMOD, [ libkmod >= 5 ],
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PKG_CHECK_MODULES(KMOD, [ libkmod >= 14 ],
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[AC_DEFINE(HAVE_KMOD, 1, [Define if kmod is available]) have_kmod=yes], have_kmod=no)
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if test "x$have_kmod" = xno -a "x$enable_kmod" = xyes; then
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AC_MSG_ERROR([*** kmod support requested but libraries not found])
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@ -812,77 +812,6 @@ static void handle_signal(struct udev *udev, int signo)
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}
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}
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static void static_dev_create_from_modules(struct udev *udev)
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{
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struct utsname kernel;
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char modules[UTIL_PATH_SIZE];
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char buf[4096];
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FILE *f;
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if (uname(&kernel) < 0) {
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log_error("uname failed: %m");
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return;
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}
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strscpyl(modules, sizeof(modules), ROOTPREFIX "/lib/modules/", kernel.release, "/modules.devname", NULL);
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f = fopen(modules, "re");
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if (f == NULL)
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return;
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while (fgets(buf, sizeof(buf), f) != NULL) {
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char *s;
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const char *modname;
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const char *devname;
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const char *devno;
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int maj, min;
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char type;
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mode_t mode;
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char filename[UTIL_PATH_SIZE];
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if (buf[0] == '#')
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continue;
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modname = buf;
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s = strchr(modname, ' ');
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if (s == NULL)
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continue;
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s[0] = '\0';
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devname = &s[1];
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s = strchr(devname, ' ');
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if (s == NULL)
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continue;
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s[0] = '\0';
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devno = &s[1];
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s = strchr(devno, ' ');
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if (s == NULL)
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s = strchr(devno, '\n');
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if (s != NULL)
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s[0] = '\0';
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if (sscanf(devno, "%c%u:%u", &type, &maj, &min) != 3)
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continue;
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mode = 0600;
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if (type == 'c')
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mode |= S_IFCHR;
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else if (type == 'b')
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mode |= S_IFBLK;
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else
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continue;
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strscpyl(filename, sizeof(filename), "/dev/", devname, NULL);
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mkdir_parents_label(filename, 0755);
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label_context_set(filename, mode);
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log_debug("mknod '%s' %c%u:%u\n", filename, type, maj, min);
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if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST)
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utimensat(AT_FDCWD, filename, NULL, 0);
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label_context_clear();
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}
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fclose(f);
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}
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static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
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{
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int ctrl = -1, netlink = -1;
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@ -1067,7 +996,6 @@ int main(int argc, char *argv[])
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mkdir("/run/udev", 0755);
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dev_setup(NULL);
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static_dev_create_from_modules(udev);
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/* before opening new files, make sure std{in,out,err} fds are in a sane state */
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if (daemonize) {
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1
units/.gitignore
vendored
1
units/.gitignore
vendored
@ -58,3 +58,4 @@
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/initrd-udevadm-cleanup-db.service
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/systemd-nspawn@.service
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/systemd-machined.service
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/kmod-static-nodes.service
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16
units/kmod-static-nodes.service.in
Normal file
16
units/kmod-static-nodes.service.in
Normal file
@ -0,0 +1,16 @@
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# This file is part of systemd.
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#
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# systemd is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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[Unit]
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Description=Create list of required static device nodes for the current kernel
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DefaultDependencies=no
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Before=sysinit.target systemd-tmpfiles-setup-dev.service
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[Service]
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Type=oneshot
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ExecStartPre=/usr/bin/mkdir -p /run/tmpfiles.d
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ExecStart=@KMOD@ static-nodes --format=tmpfiles --output=/run/tmpfiles.d/kmod.conf
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@ -9,7 +9,7 @@
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Description=Create static device nodes in /dev
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Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)
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DefaultDependencies=no
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Before=sysinit.target systemd-udevd.service
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Before=sysinit.target local-fs-pre.target systemd-udevd.service
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ConditionCapability=CAP_MKNOD
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[Service]
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@ -11,8 +11,8 @@ Documentation=man:systemd-udevd.service(8) man:udev(7)
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DefaultDependencies=no
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Wants=systemd-udevd-control.socket systemd-udevd-kernel.socket
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After=systemd-udevd-control.socket systemd-udevd-kernel.socket
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Before=sysinit.target local-fs-pre.target
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ConditionCapability=CAP_MKNOD
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Before=sysinit.target
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ConditionPathIsReadWrite=/sys
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[Service]
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Type=notify
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