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install.c
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install.c
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/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty <of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "alloc-util.h"
#include "conf-files.h"
#include "conf-parser.h"
#include "dirent-util.h"
#include "extract-word.h"
#include "fd-util.h"
#include "fileio.h"
#include "fs-util.h"
#include "hashmap.h"
#include "install-printf.h"
#include "install.h"
#include "log.h"
#include "macro.h"
#include "mkdir.h"
#include "path-lookup.h"
#include "path-util.h"
#include "rm-rf.h"
#include "set.h"
#include "special.h"
#include "stat-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"
#define UNIT_FILE_FOLLOW_SYMLINK_MAX 64
typedef enum SearchFlags {
SEARCH_LOAD = 1,
SEARCH_FOLLOW_CONFIG_SYMLINKS = 2,
} SearchFlags;
typedef struct {
OrderedHashmap *will_process;
OrderedHashmap *have_processed;
} InstallContext;
typedef enum {
PRESET_UNKNOWN,
PRESET_ENABLE,
PRESET_DISABLE,
} PresetAction;
typedef struct {
char *pattern;
PresetAction action;
} PresetRule;
typedef struct {
PresetRule *rules;
size_t n_rules;
} Presets;
static inline void presets_freep(Presets *p) {
size_t i;
if (!p)
return;
for (i = 0; i < p->n_rules; i++)
free(p->rules[i].pattern);
free(p->rules);
p->n_rules = 0;
}
static int unit_file_lookup_state(UnitFileScope scope, const LookupPaths *paths, const char *name, UnitFileState *ret);
bool unit_type_may_alias(UnitType type) {
return IN_SET(type,
UNIT_SERVICE,
UNIT_SOCKET,
UNIT_TARGET,
UNIT_DEVICE,
UNIT_TIMER,
UNIT_PATH);
}
bool unit_type_may_template(UnitType type) {
return IN_SET(type,
UNIT_SERVICE,
UNIT_SOCKET,
UNIT_TARGET,
UNIT_TIMER,
UNIT_PATH);
}
static const char *unit_file_type_table[_UNIT_FILE_TYPE_MAX] = {
[UNIT_FILE_TYPE_REGULAR] = "regular",
[UNIT_FILE_TYPE_SYMLINK] = "symlink",
[UNIT_FILE_TYPE_MASKED] = "masked",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(unit_file_type, UnitFileType);
static int in_search_path(const LookupPaths *p, const char *path) {
_cleanup_free_ char *parent = NULL;
char **i;
assert(path);
parent = dirname_malloc(path);
if (!parent)
return -ENOMEM;
STRV_FOREACH(i, p->search_path)
if (path_equal(parent, *i))
return true;
return false;
}
static const char* skip_root(const LookupPaths *p, const char *path) {
char *e;
assert(p);
assert(path);
if (!p->root_dir)
return path;
e = path_startswith(path, p->root_dir);
if (!e)
return NULL;
/* Make sure the returned path starts with a slash */
if (e[0] != '/') {
if (e == path || e[-1] != '/')
return NULL;
e--;
}
return e;
}
static int path_is_generator(const LookupPaths *p, const char *path) {
_cleanup_free_ char *parent = NULL;
assert(p);
assert(path);
parent = dirname_malloc(path);
if (!parent)
return -ENOMEM;
return path_equal_ptr(parent, p->generator) ||
path_equal_ptr(parent, p->generator_early) ||
path_equal_ptr(parent, p->generator_late);
}
static int path_is_transient(const LookupPaths *p, const char *path) {
_cleanup_free_ char *parent = NULL;
assert(p);
assert(path);
parent = dirname_malloc(path);
if (!parent)
return -ENOMEM;
return path_equal_ptr(parent, p->transient);
}
static int path_is_control(const LookupPaths *p, const char *path) {
_cleanup_free_ char *parent = NULL;
assert(p);
assert(path);
parent = dirname_malloc(path);
if (!parent)
return -ENOMEM;
return path_equal_ptr(parent, p->persistent_control) ||
path_equal_ptr(parent, p->runtime_control);
}
static int path_is_config(const LookupPaths *p, const char *path) {
_cleanup_free_ char *parent = NULL;
assert(p);
assert(path);
/* Note that we do *not* have generic checks for /etc or /run in place, since with them we couldn't discern
* configuration from transient or generated units */
parent = dirname_malloc(path);
if (!parent)
return -ENOMEM;
return path_equal_ptr(parent, p->persistent_config) ||
path_equal_ptr(parent, p->runtime_config);
}
static int path_is_runtime(const LookupPaths *p, const char *path) {
_cleanup_free_ char *parent = NULL;
const char *rpath;
assert(p);
assert(path);
/* Everything in /run is considered runtime. On top of that we also add explicit checks for the various runtime
* directories, as safety net. */
rpath = skip_root(p, path);
if (rpath && path_startswith(rpath, "/run"))
return true;
parent = dirname_malloc(path);
if (!parent)
return -ENOMEM;
return path_equal_ptr(parent, p->runtime_config) ||
path_equal_ptr(parent, p->generator) ||
path_equal_ptr(parent, p->generator_early) ||
path_equal_ptr(parent, p->generator_late) ||
path_equal_ptr(parent, p->transient) ||
path_equal_ptr(parent, p->runtime_control);
}
static int path_is_vendor(const LookupPaths *p, const char *path) {
const char *rpath;
assert(p);
assert(path);
rpath = skip_root(p, path);
if (!rpath)
return 0;
if (path_startswith(rpath, "/usr"))
return true;
#ifdef HAVE_SPLIT_USR
if (path_startswith(rpath, "/lib"))
return true;
#endif
return path_equal(rpath, SYSTEM_DATA_UNIT_PATH);
}
int unit_file_changes_add(
UnitFileChange **changes,
unsigned *n_changes,
UnitFileChangeType type,
const char *path,
const char *source) {
_cleanup_free_ char *p = NULL, *s = NULL;
UnitFileChange *c;
assert(path);
assert(!changes == !n_changes);
if (!changes)
return 0;
c = realloc(*changes, (*n_changes + 1) * sizeof(UnitFileChange));
if (!c)
return -ENOMEM;
*changes = c;
p = strdup(path);
if (source)
s = strdup(source);
if (!p || (source && !s))
return -ENOMEM;
path_kill_slashes(p);
if (s)
path_kill_slashes(s);
c[*n_changes] = (UnitFileChange) { type, p, s };
p = s = NULL;
(*n_changes) ++;
return 0;
}
void unit_file_changes_free(UnitFileChange *changes, unsigned n_changes) {
unsigned i;
assert(changes || n_changes == 0);
for (i = 0; i < n_changes; i++) {
free(changes[i].path);
free(changes[i].source);
}
free(changes);
}
void unit_file_dump_changes(int r, const char *verb, const UnitFileChange *changes, unsigned n_changes, bool quiet) {
unsigned i;
bool logged = false;
assert(changes || n_changes == 0);
/* If verb is not specified, errors are not allowed! */
assert(verb || r >= 0);
for (i = 0; i < n_changes; i++) {
assert(verb || changes[i].type >= 0);
switch(changes[i].type) {
case UNIT_FILE_SYMLINK:
if (!quiet)
log_info("Created symlink %s, pointing to %s.", changes[i].path, changes[i].source);
break;
case UNIT_FILE_UNLINK:
if (!quiet)
log_info("Removed %s.", changes[i].path);
break;
case UNIT_FILE_IS_MASKED:
if (!quiet)
log_info("Unit %s is masked, ignoring.", changes[i].path);
break;
case UNIT_FILE_IS_DANGLING:
if (!quiet)
log_info("Unit %s is an alias to a unit that is not present, ignoring.",
changes[i].path);
break;
case -EEXIST:
if (changes[i].source)
log_error_errno(changes[i].type,
"Failed to %s unit, file %s already exists and is a symlink to %s.",
verb, changes[i].path, changes[i].source);
else
log_error_errno(changes[i].type,
"Failed to %s unit, file %s already exists.",
verb, changes[i].path);
logged = true;
break;
case -ERFKILL:
log_error_errno(changes[i].type, "Failed to %s unit, unit %s is masked.",
verb, changes[i].path);
logged = true;
break;
case -EADDRNOTAVAIL:
log_error_errno(changes[i].type, "Failed to %s unit, unit %s is transient or generated.",
verb, changes[i].path);
logged = true;
break;
case -ELOOP:
log_error_errno(changes[i].type, "Failed to %s unit, refusing to operate on linked unit file %s",
verb, changes[i].path);
logged = true;
break;
default:
assert(changes[i].type < 0);
log_error_errno(changes[i].type, "Failed to %s unit, file %s: %m.",
verb, changes[i].path);
logged = true;
}
}
if (r < 0 && !logged)
log_error_errno(r, "Failed to %s: %m.", verb);
}
static int create_symlink(
const char *old_path,
const char *new_path,
bool force,
UnitFileChange **changes,
unsigned *n_changes) {
_cleanup_free_ char *dest = NULL;
int r;
assert(old_path);
assert(new_path);
/* Actually create a symlink, and remember that we did. Is
* smart enough to check if there's already a valid symlink in
* place. */
mkdir_parents_label(new_path, 0755);
if (symlink(old_path, new_path) >= 0) {
unit_file_changes_add(changes, n_changes, UNIT_FILE_SYMLINK, new_path, old_path);
return 1;
}
if (errno != EEXIST) {
unit_file_changes_add(changes, n_changes, -errno, new_path, NULL);
return -errno;
}
r = readlink_malloc(new_path, &dest);
if (r < 0) {
/* translate EINVAL (non-symlink exists) to EEXIST */
if (r == -EINVAL)
r = -EEXIST;
unit_file_changes_add(changes, n_changes, r, new_path, NULL);
return r;
}
if (path_equal(dest, old_path))
return 0;
if (!force) {
unit_file_changes_add(changes, n_changes, -EEXIST, new_path, dest);
return -EEXIST;
}
r = symlink_atomic(old_path, new_path);
if (r < 0) {
unit_file_changes_add(changes, n_changes, r, new_path, NULL);
return r;
}
unit_file_changes_add(changes, n_changes, UNIT_FILE_UNLINK, new_path, NULL);
unit_file_changes_add(changes, n_changes, UNIT_FILE_SYMLINK, new_path, old_path);
return 1;
}
static int mark_symlink_for_removal(
Set **remove_symlinks_to,
const char *p) {
char *n;
int r;
assert(p);
r = set_ensure_allocated(remove_symlinks_to, &string_hash_ops);
if (r < 0)
return r;
n = strdup(p);
if (!n)
return -ENOMEM;
path_kill_slashes(n);
r = set_consume(*remove_symlinks_to, n);
if (r == -EEXIST)
return 0;
if (r < 0)
return r;
return 1;
}
static int remove_marked_symlinks_fd(
Set *remove_symlinks_to,
int fd,
const char *path,
const char *config_path,
const LookupPaths *lp,
bool *restart,
UnitFileChange **changes,
unsigned *n_changes) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r = 0;
assert(remove_symlinks_to);
assert(fd >= 0);
assert(path);
assert(config_path);
assert(lp);
assert(restart);
d = fdopendir(fd);
if (!d) {
safe_close(fd);
return -errno;
}
rewinddir(d);
FOREACH_DIRENT(de, d, return -errno) {
dirent_ensure_type(d, de);
if (de->d_type == DT_DIR) {
_cleanup_free_ char *p = NULL;
int nfd, q;
nfd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
if (nfd < 0) {
if (errno == ENOENT)
continue;
if (r == 0)
r = -errno;
continue;
}
p = path_make_absolute(de->d_name, path);
if (!p) {
safe_close(nfd);
return -ENOMEM;
}
/* This will close nfd, regardless whether it succeeds or not */
q = remove_marked_symlinks_fd(remove_symlinks_to, nfd, p, config_path, lp, restart, changes, n_changes);
if (q < 0 && r == 0)
r = q;
} else if (de->d_type == DT_LNK) {
_cleanup_free_ char *p = NULL, *dest = NULL;
const char *rp;
bool found;
int q;
if (!unit_name_is_valid(de->d_name, UNIT_NAME_ANY))
continue;
p = path_make_absolute(de->d_name, path);
if (!p)
return -ENOMEM;
path_kill_slashes(p);
q = readlink_malloc(p, &dest);
if (q == -ENOENT)
continue;
if (q < 0) {
if (r == 0)
r = q;
continue;
}
/* We remove all links pointing to a file or path that is marked, as well as all files sharing
* the same name as a file that is marked. */
found = set_contains(remove_symlinks_to, dest) ||
set_contains(remove_symlinks_to, basename(dest)) ||
set_contains(remove_symlinks_to, de->d_name);
if (!found)
continue;
if (unlinkat(fd, de->d_name, 0) < 0 && errno != ENOENT) {
if (r == 0)
r = -errno;
unit_file_changes_add(changes, n_changes, -errno, p, NULL);
continue;
}
(void) rmdir_parents(p, config_path);
unit_file_changes_add(changes, n_changes, UNIT_FILE_UNLINK, p, NULL);
/* Now, remember the full path (but with the root prefix removed) of
* the symlink we just removed, and remove any symlinks to it, too. */
rp = skip_root(lp, p);
q = mark_symlink_for_removal(&remove_symlinks_to, rp ?: p);
if (q < 0)
return q;
if (q > 0)
*restart = true;
}
}
return r;
}
static int remove_marked_symlinks(
Set *remove_symlinks_to,
const char *config_path,
const LookupPaths *lp,
UnitFileChange **changes,
unsigned *n_changes) {
_cleanup_close_ int fd = -1;
bool restart;
int r = 0;
assert(config_path);
assert(lp);
if (set_size(remove_symlinks_to) <= 0)
return 0;
fd = open(config_path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
if (fd < 0)
return -errno;
do {
int q, cfd;
restart = false;
cfd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
if (cfd < 0)
return -errno;
/* This takes possession of cfd and closes it */
q = remove_marked_symlinks_fd(remove_symlinks_to, cfd, config_path, config_path, lp, &restart, changes, n_changes);
if (r == 0)
r = q;
} while (restart);
return r;
}
static int find_symlinks_fd(
const char *root_dir,
const char *name,
int fd,
const char *path,
const char *config_path,
const LookupPaths *lp,
bool *same_name_link) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r = 0;
assert(name);
assert(fd >= 0);
assert(path);
assert(config_path);
assert(lp);
assert(same_name_link);
d = fdopendir(fd);
if (!d) {
safe_close(fd);
return -errno;
}
FOREACH_DIRENT(de, d, return -errno) {
dirent_ensure_type(d, de);
if (de->d_type == DT_DIR) {
_cleanup_free_ char *p = NULL;
int nfd, q;
nfd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
if (nfd < 0) {
if (errno == ENOENT)
continue;
if (r == 0)
r = -errno;
continue;
}
p = path_make_absolute(de->d_name, path);
if (!p) {
safe_close(nfd);
return -ENOMEM;
}
/* This will close nfd, regardless whether it succeeds or not */
q = find_symlinks_fd(root_dir, name, nfd, p, config_path, lp, same_name_link);
if (q > 0)
return 1;
if (r == 0)
r = q;
} else if (de->d_type == DT_LNK) {
_cleanup_free_ char *p = NULL, *dest = NULL;
bool found_path, found_dest, b = false;
int q;
/* Acquire symlink name */
p = path_make_absolute(de->d_name, path);
if (!p)
return -ENOMEM;
/* Acquire symlink destination */
q = readlink_malloc(p, &dest);
if (q == -ENOENT)
continue;
if (q < 0) {
if (r == 0)
r = q;
continue;
}
/* Make absolute */
if (!path_is_absolute(dest)) {
char *x;
x = prefix_root(root_dir, dest);
if (!x)
return -ENOMEM;
free(dest);
dest = x;
}
/* Check if the symlink itself matches what we
* are looking for */
if (path_is_absolute(name))
found_path = path_equal(p, name);
else
found_path = streq(de->d_name, name);
/* Check if what the symlink points to
* matches what we are looking for */
if (path_is_absolute(name))
found_dest = path_equal(dest, name);
else
found_dest = streq(basename(dest), name);
if (found_path && found_dest) {
_cleanup_free_ char *t = NULL;
/* Filter out same name links in the main
* config path */
t = path_make_absolute(name, config_path);
if (!t)
return -ENOMEM;
b = path_equal(t, p);
}
if (b)
*same_name_link = true;
else if (found_path || found_dest)
return 1;
}
}
return r;
}
static int find_symlinks(
const char *root_dir,
const char *name,
const char *config_path,
const LookupPaths *lp,
bool *same_name_link) {
int fd;
assert(name);
assert(config_path);
assert(same_name_link);
fd = open(config_path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
if (fd < 0) {
if (errno == ENOENT)
return 0;
return -errno;
}
/* This takes possession of fd and closes it */
return find_symlinks_fd(root_dir, name, fd, config_path, config_path, lp, same_name_link);
}
static int find_symlinks_in_scope(
UnitFileScope scope,
const LookupPaths *paths,
const char *name,
UnitFileState *state) {
bool same_name_link_runtime = false, same_name_link = false;
int r;
assert(scope >= 0);
assert(scope < _UNIT_FILE_SCOPE_MAX);
assert(paths);
assert(name);
/* First look in the persistent config path */
r = find_symlinks(paths->root_dir, name, paths->persistent_config, paths, &same_name_link);
if (r < 0)
return r;
if (r > 0) {
*state = UNIT_FILE_ENABLED;
return r;
}
/* Then look in runtime config path */
r = find_symlinks(paths->root_dir, name, paths->runtime_config, paths, &same_name_link_runtime);
if (r < 0)
return r;
if (r > 0) {
*state = UNIT_FILE_ENABLED_RUNTIME;
return r;
}
/* Hmm, we didn't find it, but maybe we found the same name
* link? */
if (same_name_link) {
*state = UNIT_FILE_LINKED;
return 1;
}
if (same_name_link_runtime) {
*state = UNIT_FILE_LINKED_RUNTIME;
return 1;
}
return 0;
}
static void install_info_free(UnitFileInstallInfo *i) {
if (!i)
return;
free(i->name);
free(i->path);
strv_free(i->aliases);
strv_free(i->wanted_by);
strv_free(i->required_by);
strv_free(i->also);
free(i->default_instance);
free(i->symlink_target);
free(i);
}
static OrderedHashmap* install_info_hashmap_free(OrderedHashmap *m) {
UnitFileInstallInfo *i;
if (!m)
return NULL;
while ((i = ordered_hashmap_steal_first(m)))
install_info_free(i);
return ordered_hashmap_free(m);
}
static void install_context_done(InstallContext *c) {
assert(c);
c->will_process = install_info_hashmap_free(c->will_process);
c->have_processed = install_info_hashmap_free(c->have_processed);
}
static UnitFileInstallInfo *install_info_find(InstallContext *c, const char *name) {
UnitFileInstallInfo *i;
i = ordered_hashmap_get(c->have_processed, name);
if (i)
return i;
return ordered_hashmap_get(c->will_process, name);
}
static int install_info_may_process(
UnitFileInstallInfo *i,
const LookupPaths *paths,
UnitFileChange **changes,
unsigned *n_changes) {
assert(i);
assert(paths);
/* Checks whether the loaded unit file is one we should process, or is masked, transient or generated and thus
* not subject to enable/disable operations. */
if (i->type == UNIT_FILE_TYPE_MASKED) {
unit_file_changes_add(changes, n_changes, -ERFKILL, i->path, NULL);
return -ERFKILL;
}
if (path_is_generator(paths, i->path) ||
path_is_transient(paths, i->path)) {
unit_file_changes_add(changes, n_changes, -EADDRNOTAVAIL, i->path, NULL);
return -EADDRNOTAVAIL;
}
return 0;
}
static int install_info_add(
InstallContext *c,
const char *name,
const char *path,
UnitFileInstallInfo **ret) {
UnitFileInstallInfo *i = NULL;
int r;
assert(c);
assert(name || path);
if (!name)
name = basename(path);
if (!unit_name_is_valid(name, UNIT_NAME_ANY))
return -EINVAL;
i = install_info_find(c, name);
if (i) {
if (ret)
*ret = i;
return 0;
}
r = ordered_hashmap_ensure_allocated(&c->will_process, &string_hash_ops);
if (r < 0)
return r;
i = new0(UnitFileInstallInfo, 1);
if (!i)
return -ENOMEM;
i->type = _UNIT_FILE_TYPE_INVALID;
i->name = strdup(name);
if (!i->name) {
r = -ENOMEM;
goto fail;
}
if (path) {
i->path = strdup(path);
if (!i->path) {
r = -ENOMEM;
goto fail;
}
}
r = ordered_hashmap_put(c->will_process, i->name, i);
if (r < 0)
goto fail;
if (ret)
*ret = i;
return 0;
fail:
install_info_free(i);
return r;
}
static int config_parse_alias(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
const char *name;
UnitType type;
assert(filename);
assert(lvalue);
assert(rvalue);
name = basename(filename);
type = unit_name_to_type(name);
if (!unit_type_may_alias(type))
return log_syntax(unit, LOG_WARNING, filename, line, 0,
"Aliases are not allowed for %s units, ignoring.",
unit_type_to_string(type));
return config_parse_strv(unit, filename, line, section, section_line,
lvalue, ltype, rvalue, data, userdata);
}
static int config_parse_also(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,