+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
#include "alloc-util.h"
#include "fd-util.h"
+#include "fs-util.h"
#include "fileio.h"
#include "fstab-util.h"
#include "generator.h"
#include "unit-name.h"
#include "util.h"
#include "virt.h"
+#include "volatile-util.h"
static const char *arg_dest = "/tmp";
+static const char *arg_dest_late = "/tmp";
static bool arg_fstab_enabled = true;
static char *arg_root_what = NULL;
static char *arg_root_fstype = NULL;
static char *arg_root_options = NULL;
+static char *arg_root_hash = NULL;
static int arg_root_rw = -1;
static char *arg_usr_what = NULL;
static char *arg_usr_fstype = NULL;
static char *arg_usr_options = NULL;
+static VolatileMode arg_volatile_mode = _VOLATILE_MODE_INVALID;
+
+static int write_options(FILE *f, const char *options) {
+ _cleanup_free_ char *o = NULL;
+
+ if (isempty(options))
+ return 0;
+
+ if (streq(options, "defaults"))
+ return 0;
+
+ o = strreplace(options, "%", "%%");
+ if (!o)
+ return log_oom();
+
+ fprintf(f, "Options=%s\n", o);
+ return 1;
+}
+
+static int write_what(FILE *f, const char *what) {
+ _cleanup_free_ char *w = NULL;
+
+ w = strreplace(what, "%", "%%");
+ if (!w)
+ return log_oom();
+
+ fprintf(f, "What=%s\n", w);
+ return 1;
+}
static int add_swap(
const char *what,
bool noauto,
bool nofail) {
- _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL;
+ _cleanup_free_ char *name = NULL, *unit = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
- unit = strjoin(arg_dest, "/", name, NULL);
+ unit = strjoin(arg_dest, "/", name);
if (!unit)
return log_oom();
f = fopen(unit, "wxe");
- if (!f) {
- if (errno == EEXIST)
- log_error("Failed to create swap unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
- else
- log_error_errno(errno, "Failed to create unit file %s: %m", unit);
- return -errno;
- }
-
- fprintf(f,
- "# Automatically generated by systemd-fstab-generator\n\n"
- "[Unit]\n"
- "SourcePath=/etc/fstab\n"
- "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n\n"
- "[Swap]\n"
- "What=%s\n",
- what);
+ if (!f)
+ return log_error_errno(errno,
+ errno == EEXIST ?
+ "Failed to create swap unit file %s, as it already exists. Duplicate entry in /etc/fstab?" :
+ "Failed to create unit file %s: %m",
+ unit);
+
+ fputs_unlocked("# Automatically generated by systemd-fstab-generator\n\n"
+ "[Unit]\n"
+ "SourcePath=/etc/fstab\n"
+ "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n\n"
+ "[Swap]\n", f);
+
+ r = write_what(f, what);
+ if (r < 0)
+ return r;
- if (!isempty(me->mnt_opts) && !streq(me->mnt_opts, "defaults"))
- fprintf(f, "Options=%s\n", me->mnt_opts);
+ r = write_options(f, me->mnt_opts);
+ if (r < 0)
+ return r;
r = fflush_and_check(f);
if (r < 0)
return r;
if (!noauto) {
- lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET,
- nofail ? ".wants/" : ".requires/", name, NULL);
- if (!lnk)
- return log_oom();
-
- mkdir_parents_label(lnk, 0755);
- if (symlink(unit, lnk) < 0)
- return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+ r = generator_add_symlink(arg_dest, SPECIAL_SWAP_TARGET,
+ nofail ? "wants" : "requires", name);
+ if (r < 0)
+ return r;
}
return 0;
streq(me->mnt_dir, "/usr");
}
-static int write_idle_timeout(FILE *f, const char *where, const char *opts) {
+static int write_timeout(FILE *f, const char *where, const char *opts,
+ const char *filter, const char *variable) {
_cleanup_free_ char *timeout = NULL;
char timespan[FORMAT_TIMESPAN_MAX];
usec_t u;
int r;
- r = fstab_filter_options(opts, "x-systemd.idle-timeout\0", NULL, &timeout, NULL);
+ r = fstab_filter_options(opts, filter, NULL, &timeout, NULL);
if (r < 0)
return log_warning_errno(r, "Failed to parse options: %m");
if (r == 0)
return 0;
- r = parse_sec(timeout, &u);
+ r = parse_sec_fix_0(timeout, &u);
if (r < 0) {
log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout);
return 0;
}
- fprintf(f, "TimeoutIdleSec=%s\n", format_timespan(timespan, sizeof(timespan), u, 0));
+ fprintf(f, "%s=%s\n", variable, format_timespan(timespan, sizeof(timespan), u, 0));
return 0;
}
-static int write_requires_after(FILE *f, const char *opts) {
+static int write_idle_timeout(FILE *f, const char *where, const char *opts) {
+ return write_timeout(f, where, opts,
+ "x-systemd.idle-timeout\0", "TimeoutIdleSec");
+}
+
+static int write_mount_timeout(FILE *f, const char *where, const char *opts) {
+ return write_timeout(f, where, opts,
+ "x-systemd.mount-timeout\0", "TimeoutSec");
+}
+
+static int write_dependency(FILE *f, const char *opts,
+ const char *filter, const char *format) {
_cleanup_strv_free_ char **names = NULL, **units = NULL;
_cleanup_free_ char *res = NULL;
char **s;
assert(f);
assert(opts);
- r = fstab_extract_values(opts, "x-systemd.requires", &names);
+ r = fstab_extract_values(opts, filter, &names);
if (r < 0)
return log_warning_errno(r, "Failed to parse options: %m");
if (r == 0)
res = strv_join(units, " ");
if (!res)
return log_oom();
- fprintf(f, "After=%1$s\nRequires=%1$s\n", res);
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wformat-nonliteral"
+ fprintf(f, format, res);
+#pragma GCC diagnostic pop
}
return 0;
}
+static int write_after(FILE *f, const char *opts) {
+ return write_dependency(f, opts, "x-systemd.after", "After=%1$s\n");
+}
+
+static int write_requires_after(FILE *f, const char *opts) {
+ return write_dependency(f, opts,
+ "x-systemd.requires", "After=%1$s\nRequires=%1$s\n");
+}
+
+static int write_before(FILE *f, const char *opts) {
+ return write_dependency(f, opts,
+ "x-systemd.before", "Before=%1$s\n");
+}
+
static int write_requires_mounts_for(FILE *f, const char *opts) {
_cleanup_strv_free_ char **paths = NULL;
_cleanup_free_ char *res = NULL;
}
static int add_mount(
+ const char *dest,
const char *what,
const char *where,
+ const char *original_where,
const char *fstype,
const char *opts,
int passno,
const char *source) {
_cleanup_free_ char
- *name = NULL, *unit = NULL, *lnk = NULL,
+ *name = NULL, *unit = NULL,
*automount_name = NULL, *automount_unit = NULL,
*filtered = NULL;
_cleanup_fclose_ FILE *f = NULL;
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
- unit = strjoin(arg_dest, "/", name, NULL);
+ unit = strjoin(dest, "/", name);
if (!unit)
return log_oom();
f = fopen(unit, "wxe");
- if (!f) {
- if (errno == EEXIST)
- log_error("Failed to create mount unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
- else
- log_error_errno(errno, "Failed to create unit file %s: %m", unit);
- return -errno;
- }
+ if (!f)
+ return log_error_errno(errno,
+ errno == EEXIST ?
+ "Failed to create mount unit file %s, as it already exists. Duplicate entry in /etc/fstab?" :
+ "Failed to create unit file %s: %m",
+ unit);
fprintf(f,
"# Automatically generated by systemd-fstab-generator\n\n"
"Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n",
source);
- if (!noauto && !nofail && !automount)
+ if (STRPTR_IN_SET(fstype, "nfs", "nfs4") && !automount &&
+ fstab_test_yes_no_option(opts, "bg\0" "fg\0")) {
+ /* The default retry timeout that mount.nfs uses for 'bg' mounts
+ * is 10000 minutes, where as it uses 2 minutes for 'fg' mounts.
+ * As we are making 'bg' mounts look like an 'fg' mount to
+ * mount.nfs (so systemd can manage the job-control aspects of 'bg'),
+ * we need to explicitly preserve that default, and also ensure
+ * the systemd mount-timeout doesn't interfere.
+ * By placing these options first, they can be over-ridden by
+ * settings in /etc/fstab. */
+ opts = strjoina("x-systemd.mount-timeout=infinity,retry=10000,", opts, ",fg");
+ nofail = true;
+ }
+
+ if (!nofail && !automount)
fprintf(f, "Before=%s\n", post);
if (!automount && opts) {
+ r = write_after(f, opts);
+ if (r < 0)
+ return r;
r = write_requires_after(f, opts);
+ if (r < 0)
+ return r;
+ r = write_before(f, opts);
if (r < 0)
return r;
r = write_requires_mounts_for(f, opts);
}
if (passno != 0) {
- r = generator_write_fsck_deps(f, arg_dest, what, where, fstype);
+ r = generator_write_fsck_deps(f, dest, what, where, fstype);
if (r < 0)
return r;
}
- fprintf(f,
- "\n"
- "[Mount]\n"
- "What=%s\n"
- "Where=%s\n",
- what,
- where);
+ fprintf(f, "\n[Mount]\n");
+ if (original_where)
+ fprintf(f, "# Canonicalized from %s\n", original_where);
+ fprintf(f, "Where=%s\n", where);
+
+ r = write_what(f, what);
+ if (r < 0)
+ return r;
if (!isempty(fstype) && !streq(fstype, "auto"))
fprintf(f, "Type=%s\n", fstype);
- r = generator_write_timeouts(arg_dest, what, where, opts, &filtered);
+ r = generator_write_timeouts(dest, what, where, opts, &filtered);
if (r < 0)
return r;
- if (!isempty(filtered) && !streq(filtered, "defaults"))
- fprintf(f, "Options=%s\n", filtered);
+ r = generator_write_device_deps(dest, what, where, opts);
+ if (r < 0)
+ return r;
+
+ r = write_mount_timeout(f, where, opts);
+ if (r < 0)
+ return r;
+
+ r = write_options(f, filtered);
+ if (r < 0)
+ return r;
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write unit file %s: %m", unit);
if (!noauto && !automount) {
- lnk = strjoin(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", name, NULL);
- if (!lnk)
- return log_oom();
-
- mkdir_parents_label(lnk, 0755);
- if (symlink(unit, lnk) < 0)
- return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+ r = generator_add_symlink(dest, post,
+ nofail ? "wants" : "requires", name);
+ if (r < 0)
+ return r;
}
if (automount) {
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
- automount_unit = strjoin(arg_dest, "/", automount_name, NULL);
+ automount_unit = strjoin(dest, "/", automount_name);
if (!automount_unit)
return log_oom();
fprintf(f, "Before=%s\n", post);
if (opts) {
+ r = write_after(f, opts);
+ if (r < 0)
+ return r;
r = write_requires_after(f, opts);
+ if (r < 0)
+ return r;
+ r = write_before(f, opts);
if (r < 0)
return r;
r = write_requires_mounts_for(f, opts);
if (r < 0)
return log_error_errno(r, "Failed to write unit file %s: %m", automount_unit);
- free(lnk);
- lnk = strjoin(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", automount_name, NULL);
- if (!lnk)
- return log_oom();
-
- mkdir_parents_label(lnk, 0755);
- if (symlink(automount_unit, lnk) < 0)
- return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+ r = generator_add_symlink(dest, post,
+ nofail ? "wants" : "requires", automount_name);
+ if (r < 0)
+ return r;
}
return 0;
if (errno == ENOENT)
return 0;
- log_error_errno(errno, "Failed to open %s: %m", fstab_path);
- return -errno;
+ return log_error_errno(errno, "Failed to open %s: %m", fstab_path);
}
while ((me = getmntent(f))) {
- _cleanup_free_ char *where = NULL, *what = NULL;
+ _cleanup_free_ char *where = NULL, *what = NULL, *canonical_where = NULL;
bool noauto, nofail;
int k;
continue;
}
- where = initrd ? strappend("/sysroot/", me->mnt_dir) : strdup(me->mnt_dir);
+ where = strdup(me->mnt_dir);
if (!where)
return log_oom();
- if (is_path(where))
+ if (is_path(where)) {
path_kill_slashes(where);
+ /* Follow symlinks here; see 5261ba901845c084de5a8fd06500ed09bfb0bd80 which makes sense for
+ * mount units, but causes problems since it historically worked to have symlinks in e.g.
+ * /etc/fstab. So we canonicalize here. Note that we use CHASE_NONEXISTENT to handle the case
+ * where a symlink refers to another mount target; this works assuming the sub-mountpoint
+ * target is the final directory.
+ */
+ r = chase_symlinks(where, initrd ? "/sysroot" : NULL,
+ CHASE_PREFIX_ROOT | CHASE_NONEXISTENT,
+ &canonical_where);
+ if (r < 0)
+ /* In this case for now we continue on as if it wasn't a symlink */
+ log_warning_errno(r, "Failed to read symlink target for %s: %m", where);
+ else {
+ if (streq(canonical_where, where))
+ canonical_where = mfree(canonical_where);
+ else
+ log_debug("Canonicalized what=%s where=%s to %s",
+ what, where, canonical_where);
+ }
+ }
noauto = fstab_test_yes_no_option(me->mnt_opts, "noauto\0" "auto\0");
nofail = fstab_test_yes_no_option(me->mnt_opts, "nofail\0" "fail\0");
else
post = SPECIAL_LOCAL_FS_TARGET;
- k = add_mount(what,
- where,
+ k = add_mount(arg_dest,
+ what,
+ canonical_where ?: where,
+ canonical_where ? where: NULL,
me->mnt_type,
me->mnt_opts,
me->mnt_passno,
return 0;
}
- if (streq(arg_root_what, "/dev/nfs")) {
+ if (path_equal(arg_root_what, "/dev/nfs")) {
/* This is handled by the kernel or the initrd */
log_debug("Skipping root directory handling, as /dev/nfs was requested.");
return 0;
return r;
}
- return add_mount(what,
+ return add_mount(arg_dest,
+ what,
"/sysroot",
+ NULL,
arg_root_fstype,
opts,
- is_device_path(what) ? 1 : 0,
- false,
- false,
- false,
+ is_device_path(what) ? 1 : 0, /* passno */
+ false, /* noauto off */
+ false, /* nofail off */
+ false, /* automount off */
SPECIAL_INITRD_ROOT_FS_TARGET,
"/proc/cmdline");
}
return 0;
if (arg_root_what && !arg_usr_what) {
+ /* Copy over the root device, in case the /usr mount just differs in a mount option (consider btrfs subvolumes) */
arg_usr_what = strdup(arg_root_what);
-
if (!arg_usr_what)
return log_oom();
}
if (arg_root_fstype && !arg_usr_fstype) {
arg_usr_fstype = strdup(arg_root_fstype);
-
if (!arg_usr_fstype)
return log_oom();
}
if (arg_root_options && !arg_usr_options) {
arg_usr_options = strdup(arg_root_options);
-
if (!arg_usr_options)
return log_oom();
}
return 0;
what = fstab_node_to_udev_node(arg_usr_what);
- if (!path_is_absolute(what)) {
- log_debug("Skipping entry what=%s where=/sysroot/usr type=%s", what, strna(arg_usr_fstype));
- return -1;
- }
+ if (!what)
+ return log_oom();
if (!arg_usr_options)
opts = arg_root_rw > 0 ? "rw" : "ro";
opts = arg_usr_options;
log_debug("Found entry what=%s where=/sysroot/usr type=%s", what, strna(arg_usr_fstype));
- return add_mount(what,
+ return add_mount(arg_dest,
+ what,
"/sysroot/usr",
+ NULL,
arg_usr_fstype,
opts,
- 1,
+ is_device_path(what) ? 1 : 0, /* passno */
+ false, /* noauto off */
+ false, /* nofail off */
+ false, /* automount off */
+ SPECIAL_INITRD_FS_TARGET,
+ "/proc/cmdline");
+}
+
+static int add_volatile_root(void) {
+ const char *from, *to;
+
+ if (arg_volatile_mode != VOLATILE_YES)
+ return 0;
+
+ /* Let's add in systemd-remount-volatile.service which will remount the root device to tmpfs if this is
+ * requested, leaving only /usr from the root mount inside. */
+
+ from = strjoina(SYSTEM_DATA_UNIT_PATH "/systemd-volatile-root.service");
+ to = strjoina(arg_dest, "/" SPECIAL_INITRD_ROOT_FS_TARGET, ".requires/systemd-volatile-root.service");
+
+ (void) mkdir_parents(to, 0755);
+
+ if (symlink(from, to) < 0)
+ return log_error_errno(errno, "Failed to hook in volatile remount service: %m");
+
+ return 0;
+}
+
+static int add_volatile_var(void) {
+
+ if (arg_volatile_mode != VOLATILE_STATE)
+ return 0;
+
+ /* If requested, mount /var as tmpfs, but do so only if there's nothing else defined for this. */
+
+ return add_mount(arg_dest_late,
+ "tmpfs",
+ "/var",
+ NULL,
+ "tmpfs",
+ "mode=0755",
+ 0,
false,
false,
false,
- SPECIAL_INITRD_FS_TARGET,
+ SPECIAL_LOCAL_FS_TARGET,
"/proc/cmdline");
}
-static int parse_proc_cmdline_item(const char *key, const char *value) {
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
int r;
/* root=, usr=, usrfstype= and roofstype= may occur more than once, the last
* instance should take precedence. In the case of multiple rootflags=
* or usrflags= the arguments should be concatenated */
- if (STR_IN_SET(key, "fstab", "rd.fstab") && value) {
+ if (STR_IN_SET(key, "fstab", "rd.fstab")) {
- r = parse_boolean(value);
+ r = value ? parse_boolean(value) : 1;
if (r < 0)
log_warning("Failed to parse fstab switch %s. Ignoring.", value);
else
arg_fstab_enabled = r;
- } else if (streq(key, "root") && value) {
+ } else if (streq(key, "root")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
if (free_and_strdup(&arg_root_what, value) < 0)
return log_oom();
- } else if (streq(key, "rootfstype") && value) {
+ } else if (streq(key, "rootfstype")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
if (free_and_strdup(&arg_root_fstype, value) < 0)
return log_oom();
- } else if (streq(key, "rootflags") && value) {
+ } else if (streq(key, "rootflags")) {
char *o;
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
o = arg_root_options ?
- strjoin(arg_root_options, ",", value, NULL) :
+ strjoin(arg_root_options, ",", value) :
strdup(value);
if (!o)
return log_oom();
free(arg_root_options);
arg_root_options = o;
+ } else if (streq(key, "roothash")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
- } else if (streq(key, "mount.usr") && value) {
+ if (free_and_strdup(&arg_root_hash, value) < 0)
+ return log_oom();
+
+ } else if (streq(key, "mount.usr")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
if (free_and_strdup(&arg_usr_what, value) < 0)
return log_oom();
- } else if (streq(key, "mount.usrfstype") && value) {
+ } else if (streq(key, "mount.usrfstype")) {
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
if (free_and_strdup(&arg_usr_fstype, value) < 0)
return log_oom();
- } else if (streq(key, "mount.usrflags") && value) {
+ } else if (streq(key, "mount.usrflags")) {
char *o;
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
o = arg_usr_options ?
- strjoin(arg_usr_options, ",", value, NULL) :
+ strjoin(arg_usr_options, ",", value) :
strdup(value);
if (!o)
return log_oom();
arg_root_rw = true;
else if (streq(key, "ro") && !value)
arg_root_rw = false;
+ else if (streq(key, "systemd.volatile")) {
+ VolatileMode m;
+
+ if (value) {
+ m = volatile_mode_from_string(value);
+ if (m < 0)
+ log_warning("Failed to parse systemd.volatile= argument: %s", value);
+ else
+ arg_volatile_mode = m;
+ } else
+ arg_volatile_mode = VOLATILE_YES;
+ }
return 0;
}
+static int determine_root(void) {
+ /* If we have a root hash but no root device then Verity is used, and we use the "root" DM device as root. */
+
+ if (arg_root_what)
+ return 0;
+
+ if (!arg_root_hash)
+ return 0;
+
+ arg_root_what = strdup("/dev/mapper/root");
+ if (!arg_root_what)
+ return log_oom();
+
+ log_info("Using verity root device %s.", arg_root_what);
+
+ return 1;
+}
+
int main(int argc, char *argv[]) {
int r = 0;
if (argc > 1)
arg_dest = argv[1];
+ if (argc > 3)
+ arg_dest_late = argv[3];
log_set_target(LOG_TARGET_SAFE);
log_parse_environment();
umask(0022);
- r = parse_proc_cmdline(parse_proc_cmdline_item);
+ r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
if (r < 0)
log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
+ (void) determine_root();
+
/* Always honour root= and usr= in the kernel command line if we are in an initrd */
if (in_initrd()) {
+ int k;
+
r = add_sysroot_mount();
- if (r == 0)
- r = add_sysroot_usr_mount();
- }
+
+ k = add_sysroot_usr_mount();
+ if (k < 0)
+ r = k;
+
+ k = add_volatile_root();
+ if (k < 0)
+ r = k;
+ } else
+ r = add_volatile_var();
/* Honour /etc/fstab only when that's enabled */
if (arg_fstab_enabled) {
free(arg_root_what);
free(arg_root_fstype);
free(arg_root_options);
+ free(arg_root_hash);
free(arg_usr_what);
free(arg_usr_fstype);
projects / thirdparty / systemd.git / blobdiff