From 246756ca928adaee98edd0e67712e81d8f3255a6 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Sun, 18 Jul 2010 01:33:05 +0200 Subject: [PATCH] install: optionally remove all symlinks from configuration tree recursively --- fixme | 8 +- man/systemd-install.xml | 21 ++++ src/install.c | 240 +++++++++++++++++++++++++++++++++++++++- 3 files changed, 263 insertions(+), 6 deletions(-) diff --git a/fixme b/fixme index b80ea43a2..ef2b3f987 100644 --- a/fixme +++ b/fixme @@ -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... diff --git a/man/systemd-install.xml b/man/systemd-install.xml index 03ed0c744..47dc63a61 100644 --- a/man/systemd-install.xml +++ b/man/systemd-install.xml @@ -196,6 +196,27 @@ the realize command is used. + + + + + 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 + [Install] + section. + + + + + + + Show what is done as + it is done. + + The following commands are understood: diff --git a/src/install.c b/src/install.c index bd23a938f..751d52b64 100644 --- a/src/install.c +++ b/src/install.c @@ -25,6 +25,7 @@ #include #include #include +#include #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); -- 2.30.2