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install: optionally remove all symlinks from configuration tree recursively

This commit is contained in:
Lennart Poettering 2010-07-18 01:33:05 +02:00
parent 92abbefbef
commit 246756ca92
3 changed files with 263 additions and 6 deletions
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8
fixme
View File

@ -39,8 +39,6 @@
* In command lines, support both "$FOO" and $FOO
* systemd-install disable should recursively kill all symlinks
* /etc must always take precedence even if we follow symlinks!
* /lib/init/rw
@ -51,12 +49,16 @@
* maintenance units müssen vergessen werden
* maintenance muss dokumentiert werden
* maintenance muss dokumentiert werden, ebenso OnStartup= und JobTimeoutSec=
* fingerprint.target, wireless.target, gps.target
* fix merging of device units
* set_put(), hashmap_put() return values checken. i.e. == 0 macht kein free()!
* pahole
External:
* default.target must be %ghosted...

21
man/systemd-install.xml
View File

@ -196,6 +196,27 @@
the <command>realize</command> command
is used.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--all</option></term>
<listitem><para>If set makes sure that
all symlinks on the specified unit are
removed from the configuration
directory and its subdirectories, not
just those specified in the
<literal>[Install]</literal>
section.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--verbose</option></term>
<term><option>-v</option></term>
<listitem><para>Show what is done as
it is done.</para></listitem>
</varlistentry>
</variablelist>
<para>The following commands are understood:</para>

240
src/install.c
View File

@ -25,6 +25,7 @@
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include "log.h"
#include "path-lookup.h"
@ -36,6 +37,8 @@
#include "sd-daemon.h"
static bool arg_force = false;
static bool arg_all = false;
static bool arg_verbose = false;
static enum {
WHERE_SYSTEM,
@ -67,7 +70,8 @@ typedef struct {
char **wanted_by;
} InstallInfo;
Hashmap *will_install = NULL, *have_installed = NULL;
static Hashmap *will_install = NULL, *have_installed = NULL;
static Set *remove_symlinks_to = NULL;
static int help(void) {
@ -75,9 +79,12 @@ static int help(void) {
"Install init system units.\n\n"
" -h --help Show this help\n"
" --force Override existing links\n"
" --verbose Show what is being done as it is done\n"
" --system Install into system\n"
" --session Install into session\n"
" --global Install into all sessions\n"
" --all When disabling, remove all symlinks, not\n"
" just those listed in the [Install] section\n"
" --realize[=MODE] Start/stop/restart unit after installation\n"
" Takes 'no', 'minimal', 'maybe' or 'yes'\n\n"
"Commands:\n"
@ -98,7 +105,8 @@ static int parse_argv(int argc, char *argv[]) {
ARG_SYSTEM,
ARG_GLOBAL,
ARG_FORCE,
ARG_REALIZE
ARG_REALIZE,
ARG_ALL
};
static const struct option options[] = {
@ -108,6 +116,8 @@ static int parse_argv(int argc, char *argv[]) {
{ "global", no_argument, NULL, ARG_GLOBAL },
{ "force", no_argument, NULL, ARG_FORCE },
{ "realize", optional_argument, NULL, ARG_REALIZE },
{ "all", no_argument, NULL, ARG_ALL },
{ "verbose", no_argument, NULL, 'v' },
{ NULL, 0, NULL, 0 }
};
@ -117,7 +127,7 @@ static int parse_argv(int argc, char *argv[]) {
assert(argc >= 1);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
while ((c = getopt_long(argc, argv, "hv", options, NULL)) >= 0) {
switch (c) {
@ -164,6 +174,14 @@ static int parse_argv(int argc, char *argv[]) {
break;
case ARG_ALL:
arg_all = true;
break;
case 'v':
arg_verbose = true;
break;
case '?':
return -EINVAL;
@ -280,6 +298,9 @@ static int daemon_reload(DBusConnection *bus) {
dbus_error_init(&error);
if (arg_verbose)
log_info("Reloading daemon configuration.");
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
@ -429,6 +450,9 @@ static int install_info_run(DBusConnection *bus, InstallInfo *i, bool enabled) {
}
}
if (arg_verbose)
log_info("Restarting %s.", i->name);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
@ -452,6 +476,9 @@ static int install_info_run(DBusConnection *bus, InstallInfo *i, bool enabled) {
} else if (arg_action == ACTION_DISABLE ||
(arg_action == ACTION_REALIZE && !enabled)) {
if (arg_verbose)
log_info("Stopping %s.", i->name);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
@ -527,6 +554,184 @@ static int config_parse_also(
return 0;
}
static int mark_symlink_for_removal(const char *p) {
char *n;
int r;
assert(p);
assert(path_is_absolute(p));
if (!remove_symlinks_to)
return 0;
if (!(n = canonicalize_file_name(p)))
if (!(n = strdup(p)))
return -ENOMEM;
path_kill_slashes(n);
if ((r = set_put(remove_symlinks_to, n)) < 0) {
free(n);
return r;
}
return 0;
}
static int remove_marked_symlinks_fd(int fd, const char *config_path, const char *root, bool *deleted) {
int r = 0;
DIR *d;
struct dirent *de;
assert(fd >= 0);
assert(root);
assert(deleted);
if (!(d = fdopendir(fd)))
return -errno;
rewinddir(d);
while ((de = readdir(d))) {
bool is_dir = false, is_link = false;
if (ignore_file(de->d_name))
continue;
if (de->d_type == DT_LNK)
is_link = true;
else if (de->d_type == DT_DIR)
is_dir = true;
else if (de->d_type == DT_UNKNOWN) {
struct stat st;
if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
log_error("Failed to stat %s/%s: %m", root, de->d_name);
if (r == 0)
r = -errno;
continue;
}
is_link = S_ISLNK(st.st_mode);
is_dir = S_ISDIR(st.st_mode);
} else
continue;
if (is_dir) {
int nfd, q;
char *p;
if ((nfd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW)) < 0) {
log_error("Failed to open %s/%s: %m", root, de->d_name);
if (r == 0)
r = -errno;
continue;
}
if (asprintf(&p, "%s/%s", root, de->d_name) < 0) {
log_error("Failed to allocate directory string.");
close_nointr_nofail(nfd);
r = -ENOMEM;
break;
}
q = remove_marked_symlinks_fd(nfd, config_path, p, deleted);
free(p);
close_nointr_nofail(nfd);
if (r == 0)
q = r;
} else if (is_link) {
char *p, *dest, *c;
int q;
if (asprintf(&p, "%s/%s", root, de->d_name) < 0) {
log_error("Failed to allocate symlink string.");
r = -ENOMEM;
break;
}
if ((q = readlink_and_make_absolute(p, &dest)) < 0) {
log_error("Cannot read symlink %s: %s", p, strerror(-q));
free(p);
if (r == 0)
r = q;
continue;
}
if ((c = canonicalize_file_name(dest))) {
/* This might fail if the destination
* is already removed */
free(dest);
dest = c;
}
path_kill_slashes(dest);
if (set_get(remove_symlinks_to, dest)) {
if (arg_verbose)
log_info("rm '%s'", p);
if (unlink(p) < 0) {
log_error("Cannot unlink symlink %s: %m", p);
if (r == 0)
r = -errno;
} else {
rmdir_parents(p, config_path);
path_kill_slashes(p);
if (!set_get(remove_symlinks_to, p)) {
if ((r = mark_symlink_for_removal(p)) < 0) {
if (r == 0)
r = q;
} else
*deleted = true;
}
}
}
free(p);
free(dest);
}
}
return r;
}
static int remove_marked_symlinks(const char *config_path) {
int fd, r = 0;
bool deleted;
assert(config_path);
if (set_size(remove_symlinks_to) <= 0)
return 0;
if ((fd = open(config_path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW)) < 0)
return -errno;
do {
int q;
deleted = false;
if ((q = remove_marked_symlinks_fd(fd, config_path, config_path, &deleted)) < 0) {
if (r == 0)
r = q;
}
} while (deleted);
close_nointr_nofail(fd);
return r;
}
static int create_symlink(const char *old_path, const char *new_path) {
int r;
@ -571,6 +776,9 @@ static int create_symlink(const char *old_path, const char *new_path) {
free(dest);
unlink(new_path);
if (arg_verbose)
log_info("ln -s '%s' '%s'", old_path, new_path);
if (symlink(old_path, new_path) >= 0)
return 0;
@ -580,6 +788,9 @@ static int create_symlink(const char *old_path, const char *new_path) {
} else if (arg_action == ACTION_DISABLE) {
char *dest;
if ((r = mark_symlink_for_removal(old_path)) < 0)
return r;
if ((r = readlink_and_make_absolute(new_path, &dest)) < 0) {
if (errno == ENOENT)
return 0;
@ -599,7 +810,15 @@ static int create_symlink(const char *old_path, const char *new_path) {
return 0;
}
free(dest);
if ((r = mark_symlink_for_removal(new_path)) < 0)
return r;
if (arg_verbose)
log_info("rm '%s'", new_path);
if (unlink(new_path) >= 0)
return 0;
@ -771,6 +990,12 @@ static int install_info_apply(LookupPaths *paths, InstallInfo *i, const char *co
if ((r = install_info_symlink_wants(i, config_path)) != 0)
return r;
if ((r = mark_symlink_for_removal(filename)) < 0)
return r;
if ((r = remove_marked_symlinks(config_path)) < 0)
return r;
return 0;
}
@ -898,10 +1123,17 @@ int main(int argc, char *argv[]) {
goto finish;
}
if (arg_all)
if (!(remove_symlinks_to = set_new(string_hash_func, string_compare_func))) {
log_error("Failed to allocate symlink sets.");
goto finish;
}
for (j = optind; j < argc; j++)
if ((r = install_info_add(argv[j])) < 0)
goto finish;
while ((i = hashmap_first(will_install))) {
assert_se(hashmap_move_one(have_installed, will_install, i->name) == 0);
@ -923,6 +1155,8 @@ finish:
install_info_hashmap_free(will_install);
install_info_hashmap_free(have_installed);
set_free_free(remove_symlinks_to);
lookup_paths_free(&paths);
free(config_path);