+/*
+ * Copyright (C) 2008-2009 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/stat.h>
#include <unistd.h>
#include <inttypes.h>
+#include <sys/time.h>
#include <time.h>
#include <sys/wait.h>
#include <fnmatch.h>
#include "error.h"
#include "fd.h"
#include "exec.h"
+#include "daemon.h"
+#include "signal.h"
+#include "df.h"
+#include "time.h"
+#include "snap.h"
+
+/** Command line and config file options. */
+static struct gengetopt_args_info conf;
+/** Non-NULL if we log to a file. */
+static FILE *logfile;
+/** The read end of the signal pipe */
+static int signal_pipe;
+/** Process id of current pre-create-hook/rsync/post-create-hook process. */
+static pid_t create_pid;
+/** Whether the pre-create-hook/rsync/post-create-hook is currently stopped. */
+static int create_process_stopped;
+/** Process id of current pre-remove/rm/post-remove process. */
+static pid_t remove_pid;
+/** When the next snapshot is due. */
+static int64_t next_snapshot_time;
+/** When to try to remove something. */
+static struct timeval next_removal_check;
+/** Creation time of the snapshot currently being created. */
+static int64_t current_snapshot_creation_time;
+/** The snapshot currently being removed. */
+struct snapshot *snapshot_currently_being_removed;
+/** Needed by the post-create hook. */
+static char *path_to_last_complete_snapshot;
+static char *name_of_reference_snapshot;
+/** \sa \ref snap.h for details. */
+enum hook_status snapshot_creation_status;
+/** \sa \ref snap.h for details. */
+enum hook_status snapshot_removal_status;
-struct gengetopt_args_info conf;
-char *dss_error_txt = NULL;
-
DEFINE_DSS_ERRLIST;
COMMAND(create) \
COMMAND(prune) \
COMMAND(run)
-#define COMMAND(x) int com_ ##x(int, char * const * const);
+#define COMMAND(x) static int com_ ##x(void);
COMMANDS
#undef COMMAND
-#define COMMAND(x) if (conf.x ##_given) return com_ ##x(argc, argv);
-int call_command_handler(int argc, char * const * const argv)
+#define COMMAND(x) if (conf.x ##_given) return com_ ##x();
+static int call_command_handler(void)
{
COMMANDS
- return -E_INVALID_COMMAND;
+ DSS_EMERG_LOG("BUG: did not find command handler\n");
+ return -E_BUG;
}
#undef COMMAND
#undef COMMANDS
-/*
- * complete, not being deleted: 1204565370-1204565371.Sun_Mar_02_2008_14_33-Sun_Mar_02_2008_14_43
- * complete, being deleted: 1204565370-1204565371.being_deleted
- * incomplete, not being deleted: 1204565370-incomplete
- * incomplete, being deleted: 1204565370-incomplete.being_deleted
+/**
+ * The log function of dss.
+ *
+ * \param ll Loglevel.
+ * \param fml Usual format string.
+ *
+ * All DSS_XXX_LOG() macros use this function.
*/
-enum snapshot_status_flags {
- SS_COMPLETE = 1,
- SS_BEING_DELETED = 2,
-};
-
-struct snapshot {
- char *name;
- int64_t creation_time;
- int64_t completion_time;
- enum snapshot_status_flags flags;
- unsigned interval;
-};
-
-int is_snapshot(const char *dirname, int64_t now, struct snapshot *s)
+__printf_2_3 void dss_log(int ll, const char* fmt,...)
{
- int i, ret;
- char *dash, *dot, *tmp;
- int64_t num;
+ va_list argp;
+ FILE *outfd;
+ struct tm *tm;
+ time_t t1;
+ char str[255] = "";
- assert(dirname);
- dash = strchr(dirname, '-');
- if (!dash || !dash[1] || dash == dirname)
- return 0;
- for (i = 0; dirname[i] != '-'; i++)
- if (!isdigit(dirname[i]))
- return 0;
- tmp = dss_strdup(dirname);
- tmp[i] = '\0';
- ret = dss_atoi64(tmp, &num);
- free(tmp);
- if (ret < 0) {
- free(dss_error_txt);
- return 0;
- }
- assert(num >= 0);
- if (num > now)
- return 0;
- s->creation_time = num;
- //DSS_DEBUG_LOG("%s start time: %lli\n", dirname, (long long)s->creation_time);
- s->interval = (long long) ((now - s->creation_time)
- / conf.unit_interval_arg / 24 / 3600);
- if (!strcmp(dash + 1, "incomplete")) {
- s->completion_time = -1;
- s->flags = 0; /* neither complete, nor being deleted */
- goto success;
- }
- if (!strcmp(dash + 1, "incomplete.being_deleted")) {
- s->completion_time = -1;
- s->flags = SS_BEING_DELETED; /* mot cpmplete, being deleted */
- goto success;
- }
- tmp = dash + 1;
- dot = strchr(tmp, '.');
- if (!dot || !dot[1] || dot == tmp)
- return 0;
- for (i = 0; tmp[i] != '.'; i++)
- if (!isdigit(tmp[i]))
- return 0;
- tmp = dss_strdup(dash + 1);
- tmp[i] = '\0';
- ret = dss_atoi64(tmp, &num);
- free(tmp);
- if (ret < 0) {
- free(dss_error_txt);
- return 0;
- }
- if (num > now)
- return 0;
- s->completion_time = num;
- s->flags = SS_COMPLETE;
- if (strcmp(dot + 1, "being_deleted"))
- s->flags |= SS_BEING_DELETED;
-success:
- s->name = dss_strdup(dirname);
- return 1;
+ if (ll < conf.loglevel_arg)
+ return;
+ outfd = logfile? logfile : stderr;
+ time(&t1);
+ tm = localtime(&t1);
+ strftime(str, sizeof(str), "%b %d %H:%M:%S", tm);
+ fprintf(outfd, "%s ", str);
+ if (conf.loglevel_arg <= INFO)
+ fprintf(outfd, "%i: ", ll);
+ va_start(argp, fmt);
+ vfprintf(outfd, fmt, argp);
+ va_end(argp);
}
-int64_t get_current_time(void)
+/**
+ * Print a message either to stdout or to the log file.
+ */
+static __printf_1_2 void dss_msg(const char* fmt,...)
{
- time_t now;
- time(&now);
- DSS_DEBUG_LOG("now: %lli\n", (long long) now);
- return (int64_t)now;
+ FILE *outfd = conf.daemon_given? logfile : stdout;
+ va_list argp;
+ va_start(argp, fmt);
+ vfprintf(outfd, fmt, argp);
+ va_end(argp);
}
-char *incomplete_name(int64_t start)
+static int disk_space_low(void)
{
- return make_message("%lli-incomplete", (long long)start);
+ struct disk_space ds;
+ int ret = get_disk_space(".", &ds);
+
+ if (ret < 0)
+ return ret;
+ if (conf.min_free_mb_arg)
+ if (ds.free_mb < conf.min_free_mb_arg)
+ return 1;
+ if (conf.min_free_percent_arg)
+ if (ds.percent_free < conf.min_free_percent_arg)
+ return 1;
+ if (conf.min_free_percent_inodes_arg)
+ if (ds.percent_free_inodes < conf.min_free_percent_inodes_arg)
+ return 1;
+ return 0;
}
-char *being_deleted_name(struct snapshot *s)
+static void dss_get_snapshot_list(struct snapshot_list *sl)
{
- if (s->flags & SS_COMPLETE)
- return make_message("%lli-%lli.being_deleted",
- (long long)s->creation_time,
- (long long)s->completion_time);
- return make_message("%lli-incomplete.being_deleted",
- (long long)s->creation_time);
+ get_snapshot_list(sl, conf.unit_interval_arg, conf.num_intervals_arg);
}
-int complete_name(int64_t start, int64_t end, char **result)
+static int64_t compute_next_snapshot_time(void)
{
- struct tm start_tm, end_tm;
- time_t *start_seconds = (time_t *) (uint64_t *)&start; /* STFU, gcc */
- time_t *end_seconds = (time_t *) (uint64_t *)&end; /* STFU, gcc */
- char start_str[200], end_str[200];
+ int64_t x = 0, now = get_current_time(), unit_interval
+ = 24 * 3600 * conf.unit_interval_arg, ret;
+ unsigned wanted = desired_number_of_snapshots(0, conf.num_intervals_arg),
+ num_complete_snapshots = 0;
+ int i;
+ struct snapshot *s = NULL;
+ struct snapshot_list sl;
- if (!localtime_r(start_seconds, &start_tm)) {
- make_err_msg("%lli", (long long)start);
- return -E_LOCALTIME;
- }
- if (!localtime_r(end_seconds, &end_tm)) {
- make_err_msg("%lli", (long long)end);
- return -E_LOCALTIME;
- }
- if (!strftime(start_str, sizeof(start_str), "%a_%b_%d_%Y_%H_%M_%S", &start_tm)) {
- make_err_msg("%lli", (long long)start);
- return -E_STRFTIME;
- }
- if (!strftime(end_str, sizeof(end_str), "%a_%b_%d_%Y_%H_%M_%S", &end_tm)) {
- make_err_msg("%lli", (long long)end);
- return -E_STRFTIME;
+ current_snapshot_creation_time = 0;
+ dss_get_snapshot_list(&sl);
+ FOR_EACH_SNAPSHOT(s, i, &sl) {
+ if (!(s->flags & SS_COMPLETE))
+ continue;
+ num_complete_snapshots++;
+ x += s->completion_time - s->creation_time;
}
- *result = make_message("%lli-%lli.%s-%s", (long long) start, (long long) end,
- start_str, end_str);
- return 1;
-}
-
-struct snapshot_list {
- int64_t now;
- unsigned num_snapshots;
- unsigned array_size;
- struct snapshot **snapshots;
- /**
- * Array of size num_intervals + 1
- *
- * It contains the number of snapshots in each interval. interval_count[num_intervals]
- * is the number of snapshots which belong to any interval greater than num_intervals.
- */
- unsigned *interval_count;
-};
-
-#define FOR_EACH_SNAPSHOT(s, i, sl) \
- for ((i) = 0; (i) < (sl)->num_snapshots && ((s) = (sl)->snapshots[(i)]); (i)++)
-
-
-
-#define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
+ assert(x >= 0);
-static int compare_snapshots(const void *a, const void *b)
-{
- struct snapshot *s1 = *(struct snapshot **)a;
- struct snapshot *s2 = *(struct snapshot **)b;
- return NUM_COMPARE(s2->creation_time, s1->creation_time);
+ ret = now;
+ if (num_complete_snapshots == 0)
+ goto out;
+ x /= num_complete_snapshots; /* avg time to create one snapshot */
+ if (unit_interval < x * wanted) /* oops, no sleep at all */
+ goto out;
+ ret = s->completion_time + unit_interval / wanted - x;
+out:
+ free_snapshot_list(&sl);
+ return ret;
}
-/** Compute the minimum of \a a and \a b. */
-#define DSS_MIN(a,b) ((a) < (b) ? (a) : (b))
-
-int add_snapshot(const char *dirname, void *private)
+static inline void invalidate_next_snapshot_time(void)
{
- struct snapshot_list *sl = private;
- struct snapshot s;
- int ret = is_snapshot(dirname, sl->now, &s);
-
- if (!ret)
- return 1;
- if (sl->num_snapshots >= sl->array_size) {
- sl->array_size = 2 * sl->array_size + 1;
- sl->snapshots = dss_realloc(sl->snapshots,
- sl->array_size * sizeof(struct snapshot *));
- }
- sl->snapshots[sl->num_snapshots] = dss_malloc(sizeof(struct snapshot));
- *(sl->snapshots[sl->num_snapshots]) = s;
- sl->interval_count[DSS_MIN(s.interval, conf.num_intervals_arg)]++;
- sl->num_snapshots++;
- return 1;
+ next_snapshot_time = 0;
}
-void get_snapshot_list(struct snapshot_list *sl)
+static inline int next_snapshot_time_is_valid(void)
{
- sl->now = get_current_time();
- sl->num_snapshots = 0;
- sl->array_size = 0;
- sl->snapshots = NULL;
- sl->interval_count = dss_calloc((conf.num_intervals_arg + 1) * sizeof(unsigned));
- for_each_subdir(add_snapshot, sl);
- qsort(sl->snapshots, sl->num_snapshots, sizeof(struct snapshot *),
- compare_snapshots);
+ return next_snapshot_time != 0;
}
-void free_snapshot_list(struct snapshot_list *sl)
+static int next_snapshot_is_due(void)
{
- int i;
- struct snapshot *s;
+ int64_t now = get_current_time();
- FOR_EACH_SNAPSHOT(s, i, sl) {
- free(s->name);
- free(s);
+ assert(snapshot_creation_status == HS_READY);
+ if (!next_snapshot_time_is_valid())
+ next_snapshot_time = compute_next_snapshot_time();
+ if (next_snapshot_time <= now) {
+ DSS_DEBUG_LOG("next snapshot: now\n");
+ return 1;
}
- free(sl->interval_count);
- free(sl->snapshots);
+ DSS_DEBUG_LOG("next snapshot due in %" PRId64 " seconds\n",
+ next_snapshot_time - now);
+ return 0;
}
-/**
- * Print a log message about the exit status of a child.
- */
-void log_termination_msg(pid_t pid, int status)
+static int pre_create_hook(void)
{
- if (WIFEXITED(status))
- DSS_INFO_LOG("child %i exited. Exit status: %i\n", (int)pid,
- WEXITSTATUS(status));
- else if (WIFSIGNALED(status))
- DSS_NOTICE_LOG("child %i was killed by signal %i\n", (int)pid,
- WTERMSIG(status));
- else
- DSS_WARNING_LOG("child %i terminated abormally\n", (int)pid);
+ int ret, fds[3] = {0, 0, 0};
+
+ assert(snapshot_creation_status == HS_READY);
+ /* make sure that the next snapshot time will be recomputed */
+ invalidate_next_snapshot_time();
+ if (!conf.pre_create_hook_given) {
+ snapshot_creation_status = HS_PRE_SUCCESS;
+ return 0;
+ }
+ DSS_DEBUG_LOG("executing %s\n", conf.pre_create_hook_arg);
+ ret = dss_exec_cmdline_pid(&create_pid,
+ conf.pre_create_hook_arg, fds);
+ if (ret < 0)
+ return ret;
+ snapshot_creation_status = HS_PRE_RUNNING;
+ return ret;
}
-int wait_for_process(pid_t pid, int *status)
+static int pre_remove_hook(struct snapshot *s, const char *why)
{
- int ret;
+ int ret, fds[3] = {0, 0, 0};
+ char *cmd;
- DSS_DEBUG_LOG("Waiting for process %d to terminate\n", (int)pid);
- for (;;) {
- ret = waitpid(pid, status, 0);
- if (ret >= 0 || errno != EINTR)
- break;
+ if (!s)
+ return 0;
+ DSS_DEBUG_LOG("%s snapshot %s\n", why, s->name);
+ assert(snapshot_removal_status == HS_READY);
+ assert(remove_pid == 0);
+ assert(!snapshot_currently_being_removed);
+
+ snapshot_currently_being_removed = dss_malloc(sizeof(struct snapshot));
+ *snapshot_currently_being_removed = *s;
+ snapshot_currently_being_removed->name = dss_strdup(s->name);
+
+ if (!conf.pre_remove_hook_given) {
+ snapshot_removal_status = HS_PRE_SUCCESS;
+ return 0;
}
- if (ret < 0) {
- ret = -ERRNO_TO_DSS_ERROR(errno);
- make_err_msg("failed to wait for process %d", (int)pid);
- } else
- log_termination_msg(pid, *status);
+ cmd = make_message("%s %s/%s", conf.pre_remove_hook_arg,
+ conf.dest_dir_arg, s->name);
+ DSS_DEBUG_LOG("executing %s\n", cmd);
+ ret = dss_exec_cmdline_pid(&remove_pid,
+ conf.pre_remove_hook_arg, fds);
+ free(cmd);
+ if (ret < 0)
+ return ret;
+ snapshot_removal_status = HS_PRE_RUNNING;
return ret;
}
-int remove_snapshot(struct snapshot *s, pid_t *pid)
+static int exec_rm(void)
{
+ struct snapshot *s = snapshot_currently_being_removed;
int fds[3] = {0, 0, 0};
char *new_name = being_deleted_name(s);
- int ret = dss_rename(s->name, new_name);
char *argv[] = {"rm", "-rf", new_name, NULL};
+ int ret;
+ assert(snapshot_removal_status == HS_PRE_SUCCESS);
+ assert(remove_pid == 0);
+
+ DSS_NOTICE_LOG("removing %s (interval = %i)\n", s->name, s->interval);
+ ret = dss_rename(s->name, new_name);
if (ret < 0)
goto out;
- DSS_NOTICE_LOG("removing %s (interval = %i)\n", s->name, s->interval);
- ret = dss_exec(pid, argv[0], argv, fds);
+ ret = dss_exec(&remove_pid, argv[0], argv, fds);
+ if (ret < 0)
+ goto out;
+ snapshot_removal_status = HS_RUNNING;
out:
free(new_name);
return ret;
}
-int remove_redundant_snapshot(struct snapshot_list *sl,
- int dry_run, pid_t *pid)
+static int snapshot_is_being_created(struct snapshot *s)
+{
+ return s->creation_time == current_snapshot_creation_time;
+}
+
+static struct snapshot *find_orphaned_snapshot(struct snapshot_list *sl)
+{
+ struct snapshot *s;
+ int i;
+
+ DSS_DEBUG_LOG("looking for orphaned snapshots\n");
+ FOR_EACH_SNAPSHOT(s, i, sl) {
+ if (snapshot_is_being_created(s))
+ continue;
+ /*
+ * We know that no rm is currently running, so if s is marked
+ * as being deleted, a previously started rm must have failed.
+ */
+ if (s->flags & SS_BEING_DELETED)
+ return s;
+
+ if (s->flags & SS_COMPLETE) /* good snapshot */
+ continue;
+ /*
+ * This snapshot is incomplete and it is not the snapshot
+ * currently being created. However, we must not remove it if
+ * rsync is about to be restarted. As only the newest snapshot
+ * can be restarted, this snapshot is orphaned if it is not the
+ * newest snapshot or if we are not about to restart rsync.
+ */
+ if (get_newest_snapshot(sl) != s)
+ return s;
+ if (snapshot_creation_status != HS_NEEDS_RESTART)
+ return s;
+ }
+ /* no orphaned snapshots */
+ return NULL;
+}
+
+static int is_reference_snapshot(struct snapshot *s)
+{
+ if (!name_of_reference_snapshot)
+ return 0;
+ return strcmp(s->name, name_of_reference_snapshot)? 0 : 1;
+}
+
+/*
+ * return: 0: no redundant snapshots, 1: rm process started, negative: error
+ */
+static struct snapshot *find_redundant_snapshot(struct snapshot_list *sl)
{
- int ret, i, interval;
+ int i, interval;
struct snapshot *s;
unsigned missing = 0;
- DSS_INFO_LOG("looking for intervals containing too many snapshots\n");
+ DSS_DEBUG_LOG("looking for intervals containing too many snapshots\n");
for (interval = conf.num_intervals_arg - 1; interval >= 0; interval--) {
- unsigned keep = 1<<(conf.num_intervals_arg - interval - 1);
+ unsigned keep = desired_number_of_snapshots(interval, conf.num_intervals_arg);
unsigned num = sl->interval_count[interval];
struct snapshot *victim = NULL, *prev = NULL;
int64_t score = LONG_MAX;
if (keep >= num)
missing += keep - num;
- DSS_DEBUG_LOG("interval %i: keep: %u, have: %u, missing: %u\n",
- interval, keep, num, missing);
+// DSS_DEBUG_LOG("interval %i: keep: %u, have: %u, missing: %u\n",
+// interval, keep, num, missing);
if (keep + missing >= num)
continue;
/* redundant snapshot in this interval, pick snapshot with lowest score */
FOR_EACH_SNAPSHOT(s, i, sl) {
int64_t this_score;
- DSS_DEBUG_LOG("checking %s\n", s->name);
+ if (snapshot_is_being_created(s))
+ continue;
+ if (is_reference_snapshot(s))
+ continue;
+ //DSS_DEBUG_LOG("checking %s\n", s->name);
if (s->interval > interval) {
prev = s;
continue;
/* check if s is a better victim */
this_score = s->creation_time - prev->creation_time;
assert(this_score >= 0);
- DSS_DEBUG_LOG("%s: score %lli\n", s->name, (long long)score);
+ //DSS_DEBUG_LOG("%s: score %lli\n", s->name, (long long)score);
if (this_score < score) {
score = this_score;
victim = s;
prev = s;
}
assert(victim);
- if (dry_run) {
- printf("%s would be removed (interval = %i)\n",
- victim->name, victim->interval);
- continue;
- }
- ret = remove_snapshot(victim, pid);
- return ret < 0? ret : 1;
+ return victim;
}
- return 0;
+ return NULL;
}
-int remove_old_snapshot(struct snapshot_list *sl, int dry_run, pid_t *pid)
+static struct snapshot *find_outdated_snapshot(struct snapshot_list *sl)
{
- int i, ret;
+ int i;
struct snapshot *s;
- DSS_INFO_LOG("looking for snapshots belonging to intervals greater than %d\n",
+ DSS_DEBUG_LOG("looking for snapshots belonging to intervals >= %d\n",
conf.num_intervals_arg);
FOR_EACH_SNAPSHOT(s, i, sl) {
- if (s->interval <= conf.num_intervals_arg)
+ if (snapshot_is_being_created(s))
continue;
- if (dry_run) {
- printf("%s would be removed (interval = %i)\n",
- s->name, s->interval);
+ if (is_reference_snapshot(s))
continue;
- }
- ret = remove_snapshot(s, pid);
- if (ret < 0)
- return ret;
- return 1;
+ if (s->interval < conf.num_intervals_arg)
+ continue;
+ return s;
}
- return 0;
+ return NULL;
}
-int wait_for_rm_process(pid_t pid)
+struct snapshot *find_oldest_removable_snapshot(struct snapshot_list *sl)
{
- int status, es, ret = wait_for_process(pid, &status);
- if (ret < 0)
- return ret;
- if (!WIFEXITED(status)) {
- ret = E_INVOLUNTARY_EXIT;
- make_err_msg("rm process %d died involuntary", (int)pid);
- return ret;
- }
- es = WEXITSTATUS(status);
- if (es) {
- ret = -E_BAD_EXIT_CODE;
- make_err_msg("rm process %d returned %d", (int)pid, es);
- return ret;
+ int i;
+ struct snapshot *s;
+ FOR_EACH_SNAPSHOT(s, i, sl) {
+ if (snapshot_is_being_created(s))
+ continue;
+ if (is_reference_snapshot(s))
+ continue;
+ DSS_INFO_LOG("oldest removable snapshot: %s\n", s->name);
+ return s;
}
- return 1;
+ return NULL;
}
-int com_run(int argc, char * const * argv)
+static int rename_incomplete_snapshot(int64_t start)
{
- return 42;
+ char *old_name;
+ int ret;
+
+ free(path_to_last_complete_snapshot);
+ ret = complete_name(start, get_current_time(),
+ &path_to_last_complete_snapshot);
+ if (ret < 0)
+ return ret;
+ old_name = incomplete_name(start);
+ ret = dss_rename(old_name, path_to_last_complete_snapshot);
+ if (ret >= 0)
+ DSS_NOTICE_LOG("%s -> %s\n", old_name,
+ path_to_last_complete_snapshot);
+ free(old_name);
+ return ret;
}
-int com_prune(int argc, char * const * argv)
+static int try_to_free_disk_space(void)
{
- int ret, dry_run = 0;
+ int ret;
struct snapshot_list sl;
- pid_t pid;
+ struct snapshot *victim;
+ struct timeval now;
+ const char *why;
+ int low_disk_space;
- if (argc > 2) {
- make_err_msg("too many arguments");
- return -E_SYNTAX;
- }
- if (argc == 2) {
- if (strcmp(argv[1], "-d")) {
- make_err_msg("%s", argv[1]);
- return -E_SYNTAX;
- }
- dry_run = 1;
- }
- for (;;) {
- get_snapshot_list(&sl);
- ret = remove_old_snapshot(&sl, dry_run, &pid);
- free_snapshot_list(&sl);
- if (ret < 0)
- return ret;
- if (!ret)
- break;
- ret = wait_for_rm_process(pid);
- if (ret < 0)
- goto out;
- }
- for (;;) {
- get_snapshot_list(&sl);
- ret = remove_redundant_snapshot(&sl, dry_run, &pid);
- free_snapshot_list(&sl);
- if (ret < 0)
- return ret;
- if (!ret)
- break;
- ret = wait_for_rm_process(pid);
- if (ret < 0)
- goto out;
+ ret = disk_space_low();
+ if (ret < 0)
+ return ret;
+ low_disk_space = ret;
+ gettimeofday(&now, NULL);
+ if (tv_diff(&next_removal_check, &now, NULL) > 0)
+ return 0;
+ if (!low_disk_space) {
+ if (conf.keep_redundant_given)
+ return 0;
+ if (snapshot_creation_status != HS_READY)
+ return 0;
+ if (next_snapshot_is_due())
+ return 0;
}
- return 1;
+ dss_get_snapshot_list(&sl);
+ ret = 0;
+ if (!low_disk_space && sl.num_snapshots <= 1)
+ goto out;
+ why = "outdated";
+ victim = find_outdated_snapshot(&sl);
+ if (victim)
+ goto remove;
+ why = "redundant";
+ victim = find_redundant_snapshot(&sl);
+ if (victim)
+ goto remove;
+ /* try harder only if disk space is low */
+ if (!low_disk_space)
+ goto out;
+ why = "orphaned";
+ victim = find_orphaned_snapshot(&sl);
+ if (victim)
+ goto remove;
+ DSS_WARNING_LOG("disk space low and nothing obvious to remove\n");
+ victim = find_oldest_removable_snapshot(&sl);
+ if (victim)
+ goto remove;
+ DSS_CRIT_LOG("uhuhu: disk space low and nothing to remove\n");
+ ret = -ERRNO_TO_DSS_ERROR(ENOSPC);
+ goto out;
+remove:
+ ret = pre_remove_hook(victim, why);
out:
+ free_snapshot_list(&sl);
return ret;
}
-struct newest_snapshot_data {
- char * newest_name;
- int64_t newest_creation_time;
- int64_t now;
-};
-
-int get_newest_complete(const char *dirname, void *private)
+static int post_create_hook(void)
{
- struct newest_snapshot_data *nsd = private;
- struct snapshot s;
- int ret = is_snapshot(dirname, nsd->now, &s);
-
- if (ret <= 0)
- return 1;
- if (s.creation_time < nsd->newest_creation_time)
- return 1;
- nsd->newest_creation_time = s.creation_time;
- free(nsd->newest_name);
- nsd->newest_name = s.name;
- return 1;
-}
+ int ret, fds[3] = {0, 0, 0};
+ char *cmd;
-__malloc char *name_of_newest_complete_snapshot(void)
-{
- struct newest_snapshot_data nsd = {
- .now = get_current_time(),
- .newest_creation_time = -1
- };
- for_each_subdir(get_newest_complete, &nsd);
- return nsd.newest_name;
+ if (!conf.post_create_hook_given) {
+ snapshot_creation_status = HS_READY;
+ return 0;
+ }
+ cmd = make_message("%s %s/%s", conf.post_create_hook_arg,
+ conf.dest_dir_arg, path_to_last_complete_snapshot);
+ DSS_NOTICE_LOG("executing %s\n", cmd);
+ ret = dss_exec_cmdline_pid(&create_pid, cmd, fds);
+ free(cmd);
+ if (ret < 0)
+ return ret;
+ snapshot_creation_status = HS_POST_RUNNING;
+ return ret;
}
-void create_rsync_argv(char ***argv, int64_t *num)
+static int post_remove_hook(void)
{
- char *logname, *newest = name_of_newest_complete_snapshot();
- int i = 0, j;
+ int ret, fds[3] = {0, 0, 0};
+ char *cmd;
+ struct snapshot *s = snapshot_currently_being_removed;
- *argv = dss_malloc((15 + conf.rsync_option_given) * sizeof(char *));
- (*argv)[i++] = dss_strdup("rsync");
- (*argv)[i++] = dss_strdup("-aq");
- (*argv)[i++] = dss_strdup("--delete");
- for (j = 0; j < conf.rsync_option_given; j++)
- (*argv)[i++] = dss_strdup(conf.rsync_option_arg[j]);
- if (newest) {
- DSS_INFO_LOG("using %s as reference snapshot\n", newest);
- (*argv)[i++] = make_message("--link-dest=../%s", newest);
- free(newest);
- } else
- DSS_INFO_LOG("no previous snapshot found");
- if (conf.exclude_patterns_given) {
- (*argv)[i++] = dss_strdup("--exclude-from");
- (*argv)[i++] = dss_strdup(conf.exclude_patterns_arg);
+ assert(s);
+ if (!conf.post_remove_hook_given) {
+ snapshot_removal_status = HS_READY;
+ return 0;
}
- logname = dss_logname();
- if (conf.remote_user_given && !strcmp(conf.remote_user_arg, logname))
- (*argv)[i++] = dss_strdup(conf.source_dir_arg);
- else
- (*argv)[i++] = make_message("%s@%s:%s/", conf.remote_user_given?
- conf.remote_user_arg : logname,
- conf.remote_host_arg, conf.source_dir_arg);
- free(logname);
- *num = get_current_time();
- (*argv)[i++] = incomplete_name(*num);
- (*argv)[i++] = NULL;
- for (j = 0; j < i; j++)
- DSS_DEBUG_LOG("argv[%d] = %s\n", j, (*argv)[j]);
+ cmd = make_message("%s %s/%s", conf.post_remove_hook_arg,
+ conf.dest_dir_arg, s->name);
+ DSS_NOTICE_LOG("executing %s\n", cmd);
+ ret = dss_exec_cmdline_pid(&remove_pid, cmd, fds);
+ free(cmd);
+ if (ret < 0)
+ return ret;
+ snapshot_removal_status = HS_POST_RUNNING;
+ return ret;
}
-void free_rsync_argv(char **argv)
+static void kill_process(pid_t pid)
{
- int i;
- for (i = 0; argv[i]; i++)
- free(argv[i]);
- free(argv);
+ if (!pid)
+ return;
+ DSS_WARNING_LOG("sending SIGTERM to pid %d\n", (int)pid);
+ kill(pid, SIGTERM);
}
-int create_snapshot(char **argv, pid_t *pid)
+static void stop_create_process(void)
{
- int fds[3] = {0, 0, 0};
-
- return dss_exec(pid, argv[0], argv, fds);
+ if (!create_pid || create_process_stopped)
+ return;
+ kill(SIGSTOP, create_pid);
+ create_process_stopped = 1;
}
-int rename_incomplete_snapshot(int64_t start)
+static void restart_create_process(void)
{
- char *old_name, *new_name;
- int ret;
-
- ret = complete_name(start, get_current_time(), &new_name);
- if (ret < 0)
- return ret;
- old_name = incomplete_name(start);
- ret = dss_rename(old_name, new_name);
- if (ret >= 0)
- DSS_NOTICE_LOG("%s -> %s\n", old_name, new_name);
- free(old_name);
- free(new_name);
- return ret;
+ if (!create_pid || !create_process_stopped)
+ return;
+ kill (SIGCONT, create_pid);
+ create_process_stopped = 0;
}
-int com_create(int argc, __a_unused char * const * argv)
+/**
+ * Print a log message about the exit status of a child.
+ */
+static void log_termination_msg(pid_t pid, int status)
{
- int ret, status, es;
- char **rsync_argv;
- int64_t snapshot_num;
- pid_t pid;
+ if (WIFEXITED(status))
+ DSS_INFO_LOG("child %i exited. Exit status: %i\n", (int)pid,
+ WEXITSTATUS(status));
+ else if (WIFSIGNALED(status))
+ DSS_NOTICE_LOG("child %i was killed by signal %i\n", (int)pid,
+ WTERMSIG(status));
+ else
+ DSS_WARNING_LOG("child %i terminated abormally\n", (int)pid);
+}
- if (argc != 1) {
- ret = -E_SYNTAX;
- make_err_msg("create: no args expected, %d given", argc - 1);
- return ret;
+static int wait_for_process(pid_t pid, int *status)
+{
+ int ret;
+
+ DSS_DEBUG_LOG("Waiting for process %d to terminate\n", (int)pid);
+ for (;;) {
+ fd_set rfds;
+
+ FD_ZERO(&rfds);
+ FD_SET(signal_pipe, &rfds);
+ ret = dss_select(signal_pipe + 1, &rfds, NULL, NULL);
+ if (ret < 0)
+ break;
+ ret = next_signal();
+ if (!ret)
+ continue;
+ if (ret == SIGCHLD) {
+ ret = waitpid(pid, status, 0);
+ if (ret >= 0)
+ break;
+ if (errno != EINTR) { /* error */
+ ret = -ERRNO_TO_DSS_ERROR(errno);
+ break;
+ }
+ }
+ /* SIGINT or SIGTERM */
+ DSS_WARNING_LOG("sending SIGTERM to pid %d\n", (int)pid);
+ kill(pid, SIGTERM);
}
- create_rsync_argv(&rsync_argv, &snapshot_num);
- DSS_NOTICE_LOG("creating snapshot %lli\n", (long long)snapshot_num);
- ret = create_snapshot(rsync_argv, &pid);
if (ret < 0)
- goto out;
- ret = wait_for_process(pid, &status);
+ DSS_ERROR_LOG("failed to wait for process %d\n", (int)pid);
+ else
+ log_termination_msg(pid, *status);
+ return ret;
+}
+
+static void handle_pre_remove_exit(int status)
+{
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ snapshot_removal_status = HS_READY;
+ gettimeofday(&next_removal_check, NULL);
+ next_removal_check.tv_sec += 60;
+ return;
+ }
+ snapshot_removal_status = HS_PRE_SUCCESS;
+}
+
+static int handle_rm_exit(int status)
+{
+ if (!WIFEXITED(status)) {
+ snapshot_removal_status = HS_READY;
+ return -E_INVOLUNTARY_EXIT;
+ }
+ if (WEXITSTATUS(status)) {
+ snapshot_removal_status = HS_READY;
+ return -E_BAD_EXIT_CODE;
+ }
+ if (conf.post_remove_hook_given)
+ snapshot_removal_status = HS_SUCCESS;
+ else
+ snapshot_removal_status = HS_READY;
+ return 1;
+}
+
+static void handle_post_remove_exit(void)
+{
+ snapshot_removal_status = HS_READY;
+}
+
+static int handle_remove_exit(int status)
+{
+ int ret;
+ struct snapshot *s = snapshot_currently_being_removed;
+
+ assert(s);
+ switch (snapshot_removal_status) {
+ case HS_PRE_RUNNING:
+ handle_pre_remove_exit(status);
+ ret = 1;
+ break;
+ case HS_RUNNING:
+ ret = handle_rm_exit(status);
+ break;
+ case HS_POST_RUNNING:
+ handle_post_remove_exit();
+ ret = 1;
+ break;
+ default:
+ ret = -E_BUG;
+ }
+ if (snapshot_removal_status == HS_READY) {
+ free(s->name);
+ free(s);
+ snapshot_currently_being_removed = NULL;
+ }
+ remove_pid = 0;
+ return ret;
+}
+
+static int wait_for_remove_process(void)
+{
+ int status, ret;
+
+ assert(remove_pid);
+ assert(
+ snapshot_removal_status == HS_PRE_RUNNING ||
+ snapshot_removal_status == HS_RUNNING ||
+ snapshot_removal_status == HS_POST_RUNNING
+ );
+ ret = wait_for_process(remove_pid, &status);
if (ret < 0)
- goto out;
+ return ret;
+ return handle_remove_exit(status);
+}
+
+static int handle_rsync_exit(int status)
+{
+ int es, ret;
+
if (!WIFEXITED(status)) {
- ret = E_INVOLUNTARY_EXIT;
- make_err_msg("rsync process %d died involuntary", (int)pid);
+ DSS_ERROR_LOG("rsync process %d died involuntary\n", (int)create_pid);
+ ret = -E_INVOLUNTARY_EXIT;
+ snapshot_creation_status = HS_READY;
goto out;
}
es = WEXITSTATUS(status);
+ /*
+ * Restart rsync on non-fatal errors:
+ * 12: Error in rsync protocol data stream
+ * 13: Errors with program diagnostics
+ */
+ if (es == 12 || es == 13) {
+ DSS_WARNING_LOG("rsync process %d returned %d -- restarting\n",
+ (int)create_pid, es);
+ snapshot_creation_status = HS_NEEDS_RESTART;
+ next_snapshot_time = get_current_time() + 60;
+ ret = 1;
+ goto out;
+ }
if (es != 0 && es != 23 && es != 24) {
+ DSS_ERROR_LOG("rsync process %d returned %d\n", (int)create_pid, es);
ret = -E_BAD_EXIT_CODE;
- make_err_msg("rsync process %d returned %d", (int)pid, es);
+ snapshot_creation_status = HS_READY;
goto out;
}
- ret = rename_incomplete_snapshot(snapshot_num);
+ ret = rename_incomplete_snapshot(current_snapshot_creation_time);
+ if (ret < 0)
+ goto out;
+ snapshot_creation_status = HS_SUCCESS;
+ free(name_of_reference_snapshot);
+ name_of_reference_snapshot = NULL;
out:
- free_rsync_argv(rsync_argv);
+ create_pid = 0;
+ create_process_stopped = 0;
return ret;
}
-int com_ls(int argc, __a_unused char * const * argv)
+static int handle_pre_create_hook_exit(int status)
{
- int i, ret;
- struct snapshot_list sl;
- struct snapshot *s;
- if (argc != 1) {
- ret = -E_SYNTAX;
- make_err_msg("ls: no args expected, %d given", argc - 1);
- return ret;
+ int es, ret;
+ static int warn_count;
+
+ if (!WIFEXITED(status)) {
+ snapshot_creation_status = HS_READY;
+ ret = -E_INVOLUNTARY_EXIT;
+ goto out;
}
- get_snapshot_list(&sl);
- FOR_EACH_SNAPSHOT(s, i, &sl)
- printf("%u\t%s\n", s->interval, s->name);
- free_snapshot_list(&sl);
- return 1;
+ es = WEXITSTATUS(status);
+ if (es) {
+ if (!warn_count--) {
+ DSS_NOTICE_LOG("pre_create_hook %s returned %d\n",
+ conf.pre_create_hook_arg, es);
+ DSS_NOTICE_LOG("deferring snapshot creation...\n");
+ warn_count = 60; /* warn only once per hour */
+ }
+ next_snapshot_time = get_current_time() + 60;
+ snapshot_creation_status = HS_READY;
+ ret = 0;
+ goto out;
+ }
+ warn_count = 0;
+ snapshot_creation_status = HS_PRE_SUCCESS;
+ ret = 1;
+out:
+ create_pid = 0;
+ return ret;
}
-/* TODO: Unlink pid file */
-__noreturn void clean_exit(int status)
+static int handle_sigchld(void)
{
- //kill(0, SIGTERM);
- free(dss_error_txt);
- exit(status);
+ pid_t pid;
+ int status, ret = reap_child(&pid, &status);
+
+ if (ret <= 0)
+ return ret;
+
+ if (pid == create_pid) {
+ switch (snapshot_creation_status) {
+ case HS_PRE_RUNNING:
+ return handle_pre_create_hook_exit(status);
+ case HS_RUNNING:
+ return handle_rsync_exit(status);
+ case HS_POST_RUNNING:
+ snapshot_creation_status = HS_READY;
+ return 1;
+ default:
+ DSS_EMERG_LOG("BUG: create can't die in status %d\n",
+ snapshot_creation_status);
+ return -E_BUG;
+ }
+ }
+ if (pid == remove_pid) {
+ ret = handle_remove_exit(status);
+ if (ret < 0)
+ return ret;
+ return ret;
+ }
+ DSS_EMERG_LOG("BUG: unknown process %d died\n", (int)pid);
+ return -E_BUG;
}
-__printf_2_3 void dss_log(int ll, const char* fmt,...)
+static int check_config(void)
{
- va_list argp;
- if (ll < conf.loglevel_arg)
- return;
- va_start(argp, fmt);
- vfprintf(stderr, fmt, argp);
- va_end(argp);
+ if (conf.unit_interval_arg <= 0) {
+ DSS_ERROR_LOG("bad unit interval: %i\n", conf.unit_interval_arg);
+ return -E_INVALID_NUMBER;
+ }
+ DSS_DEBUG_LOG("unit interval: %i day(s)\n", conf.unit_interval_arg);
+ if (conf.num_intervals_arg <= 0) {
+ DSS_ERROR_LOG("bad number of intervals %i\n", conf.num_intervals_arg);
+ return -E_INVALID_NUMBER;
+ }
+ DSS_DEBUG_LOG("number of intervals: %i\n", conf.num_intervals_arg);
+ return 1;
}
-int read_config_file(void)
+/*
+ * Returns < 0 on errors, 0 if no config file is given and > 0 if the config
+ * file was read successfully.
+ */
+static int parse_config_file(int override)
{
- int ret;
+ int ret, config_file_exists;
char *config_file;
struct stat statbuf;
+ char *old_logfile_arg = NULL;
+ int old_daemon_given = 0;
if (conf.config_file_given)
config_file = dss_strdup(conf.config_file_arg);
config_file = make_message("%s/.dssrc", home);
free(home);
}
- ret = stat(config_file, &statbuf);
- if (ret && conf.config_file_given) {
+ if (override) { /* SIGHUP */
+ if (conf.logfile_given)
+ old_logfile_arg = dss_strdup(conf.logfile_arg);
+ old_daemon_given = conf.daemon_given;
+ }
+
+ config_file_exists = !stat(config_file, &statbuf);
+ if (!config_file_exists && conf.config_file_given) {
ret = -ERRNO_TO_DSS_ERROR(errno);
- make_err_msg("failed to stat config file %s", config_file);
+ DSS_ERROR_LOG("failed to stat config file %s\n", config_file);
goto out;
}
- if (!ret) {
+ if (config_file_exists) {
struct cmdline_parser_params params = {
- .override = 0,
+ .override = override,
.initialize = 0,
- .check_required = 0,
- .check_ambiguity = 0
+ .check_required = 1,
+ .check_ambiguity = 0,
+ .print_errors = 1
};
+ if (override) { /* invalidate all rsync options */
+ int i;
+
+ for (i = 0; i < conf.rsync_option_given; i++) {
+ free(conf.rsync_option_arg[i]);
+ conf.rsync_option_arg[i] = NULL;
+ }
+ conf.rsync_option_given = 0;
+ }
cmdline_parser_config_file(config_file, &conf, ¶ms);
}
- if (!conf.source_dir_given || !conf.dest_dir_given) {
- ret = -E_SYNTAX;
- make_err_msg("you need to specify both source_dir and dest_dir");
+ ret = check_config();
+ if (ret < 0)
goto out;
+ if (override) {
+ /* don't change daemon mode on SIGHUP */
+ conf.daemon_given = old_daemon_given;
+ close_log(logfile);
+ logfile = NULL;
+ if (conf.logfile_given)
+ free(old_logfile_arg);
+ else if (conf.daemon_given) { /* re-use old logfile */
+ conf.logfile_arg = old_logfile_arg;
+ conf.logfile_given = 1;
+ }
}
- ret = 1;
+ if (conf.logfile_given) {
+ logfile = open_log(conf.logfile_arg);
+ log_welcome(conf.loglevel_arg);
+ }
+ DSS_DEBUG_LOG("loglevel: %d\n", conf.loglevel_arg);
+// cmdline_parser_dump(logfile? logfile : stdout, &conf);
+ ret = config_file_exists;
out:
free(config_file);
+ if (ret < 0)
+ DSS_EMERG_LOG("%s\n", dss_strerror(-ret));
return ret;
}
-int check_config(void)
+static int change_to_dest_dir(void)
{
- if (conf.unit_interval_arg <= 0) {
- make_err_msg("bad unit interval: %i", conf.unit_interval_arg);
- return -E_INVALID_NUMBER;
- }
- DSS_DEBUG_LOG("unit interval: %i day(s)\n", conf.unit_interval_arg);
- if (conf.num_intervals_arg <= 0) {
- make_err_msg("bad number of intervals %i", conf.num_intervals_arg);
- return -E_INVALID_NUMBER;
+ DSS_INFO_LOG("changing cwd to %s\n", conf.dest_dir_arg);
+ return dss_chdir(conf.dest_dir_arg);
+}
+
+static int handle_sighup(void)
+{
+ int ret;
+
+ DSS_NOTICE_LOG("SIGHUP\n");
+ ret = parse_config_file(1);
+ if (ret < 0)
+ return ret;
+ invalidate_next_snapshot_time();
+ return change_to_dest_dir();
+}
+
+static int handle_signal(void)
+{
+ int sig, ret = next_signal();
+
+ if (ret <= 0)
+ goto out;
+ sig = ret;
+ switch (sig) {
+ case SIGINT:
+ case SIGTERM:
+ restart_create_process();
+ kill_process(create_pid);
+ kill_process(remove_pid);
+ ret = -E_SIGNAL;
+ break;
+ case SIGHUP:
+ ret = handle_sighup();
+ break;
+ case SIGCHLD:
+ ret = handle_sigchld();
+ break;
}
- DSS_DEBUG_LOG("number of intervals: %i\n", conf.num_intervals_arg);
+out:
+ if (ret < 0)
+ DSS_ERROR_LOG("%s\n", dss_strerror(-ret));
+ return ret;
+}
+
+/*
+ * We can not use rsync locally if the local user is different from the remote
+ * user or if the src dir is not on the local host (or both).
+ */
+static int use_rsync_locally(char *logname)
+{
+ char *h = conf.remote_host_arg;
+
+ if (strcmp(h, "localhost") && strcmp(h, "127.0.0.1"))
+ return 0;
+ if (conf.remote_user_given && strcmp(conf.remote_user_arg, logname))
+ return 0;
return 1;
}
-int main(int argc, char **argv)
+static void create_rsync_argv(char ***argv, int64_t *num)
+{
+ char *logname;
+ int i = 0, j;
+ struct snapshot_list sl;
+
+ dss_get_snapshot_list(&sl);
+ assert(!name_of_reference_snapshot);
+ name_of_reference_snapshot = name_of_newest_complete_snapshot(&sl);
+ free_snapshot_list(&sl);
+
+ *argv = dss_malloc((15 + conf.rsync_option_given) * sizeof(char *));
+ (*argv)[i++] = dss_strdup("rsync");
+ (*argv)[i++] = dss_strdup("-aq");
+ (*argv)[i++] = dss_strdup("--delete");
+ for (j = 0; j < conf.rsync_option_given; j++)
+ (*argv)[i++] = dss_strdup(conf.rsync_option_arg[j]);
+ if (name_of_reference_snapshot) {
+ DSS_INFO_LOG("using %s as reference\n", name_of_reference_snapshot);
+ (*argv)[i++] = make_message("--link-dest=../%s",
+ name_of_reference_snapshot);
+ } else
+ DSS_INFO_LOG("no suitable reference snapshot found\n");
+ logname = dss_logname();
+ if (use_rsync_locally(logname))
+ (*argv)[i++] = dss_strdup(conf.source_dir_arg);
+ else
+ (*argv)[i++] = make_message("%s@%s:%s/", conf.remote_user_given?
+ conf.remote_user_arg : logname,
+ conf.remote_host_arg, conf.source_dir_arg);
+ free(logname);
+ *num = get_current_time();
+ (*argv)[i++] = incomplete_name(*num);
+ (*argv)[i++] = NULL;
+ for (j = 0; j < i; j++)
+ DSS_DEBUG_LOG("argv[%d] = %s\n", j, (*argv)[j]);
+}
+
+static void free_rsync_argv(char **argv)
+{
+ int i;
+
+ if (!argv)
+ return;
+ for (i = 0; argv[i]; i++)
+ free(argv[i]);
+ free(argv);
+}
+
+static int create_snapshot(char **argv)
+{
+ int ret, fds[3] = {0, 0, 0};
+ char *name;
+
+ name = incomplete_name(current_snapshot_creation_time);
+ DSS_NOTICE_LOG("creating new snapshot %s\n", name);
+ free(name);
+ ret = dss_exec(&create_pid, argv[0], argv, fds);
+ if (ret < 0)
+ return ret;
+ snapshot_creation_status = HS_RUNNING;
+ return ret;
+}
+
+static int select_loop(void)
+{
+ int ret;
+ /* check every 60 seconds for free disk space */
+ struct timeval tv;
+ char **rsync_argv = NULL;
+
+ for (;;) {
+ fd_set rfds;
+ struct timeval *tvp;
+
+ if (remove_pid)
+ tvp = NULL; /* sleep until rm hook/process dies */
+ else { /* sleep one minute */
+ tv.tv_sec = 60;
+ tv.tv_usec = 0;
+ tvp = &tv;
+ }
+ FD_ZERO(&rfds);
+ FD_SET(signal_pipe, &rfds);
+ DSS_DEBUG_LOG("tvp: %p, tv_sec : %lu\n", tvp, (long unsigned) tv.tv_sec);
+ ret = dss_select(signal_pipe + 1, &rfds, NULL, tvp);
+ if (ret < 0)
+ goto out;
+ if (FD_ISSET(signal_pipe, &rfds)) {
+ ret = handle_signal();
+ if (ret < 0)
+ goto out;
+ }
+ if (remove_pid)
+ continue;
+ if (snapshot_removal_status == HS_PRE_SUCCESS) {
+ ret = exec_rm();
+ if (ret < 0)
+ goto out;
+ continue;
+ }
+ if (snapshot_removal_status == HS_SUCCESS) {
+ ret = post_remove_hook();
+ if (ret < 0)
+ goto out;
+ continue;
+ }
+ ret = try_to_free_disk_space();
+ if (ret < 0)
+ goto out;
+ if (snapshot_removal_status != HS_READY) {
+ stop_create_process();
+ continue;
+ }
+ restart_create_process();
+ switch (snapshot_creation_status) {
+ case HS_READY:
+ if (!next_snapshot_is_due())
+ continue;
+ ret = pre_create_hook();
+ if (ret < 0)
+ goto out;
+ continue;
+ case HS_PRE_RUNNING:
+ case HS_RUNNING:
+ case HS_POST_RUNNING:
+ continue;
+ case HS_PRE_SUCCESS:
+ free_rsync_argv(rsync_argv);
+ create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
+ /* fall through */
+ case HS_NEEDS_RESTART:
+ ret = create_snapshot(rsync_argv);
+ if (ret < 0)
+ goto out;
+ continue;
+ case HS_SUCCESS:
+ ret = post_create_hook();
+ if (ret < 0)
+ goto out;
+ continue;
+ }
+ }
+out:
+ return ret;
+}
+
+static void exit_hook(int exit_code)
+{
+ int fds[3] = {0, 0, 0};
+ char *argv[] = {conf.exit_hook_arg, dss_strerror(-exit_code), NULL};
+ pid_t pid;
+
+ if (!conf.exit_hook_given)
+ return;
+ DSS_NOTICE_LOG("executing %s %s\n", argv[0], argv[1]);
+ dss_exec(&pid, conf.exit_hook_arg, argv, fds);
+}
+
+static int com_run(void)
+{
+ int ret;
+
+ if (conf.dry_run_given) {
+ DSS_ERROR_LOG("dry_run not supported by this command\n");
+ return -E_SYNTAX;
+ }
+ ret = install_sighandler(SIGHUP);
+ if (ret < 0)
+ return ret;
+ ret = select_loop();
+ if (ret >= 0) /* impossible */
+ ret = -E_BUG;
+ exit_hook(ret);
+ return ret;
+}
+
+static int com_prune(void)
{
int ret;
+ struct snapshot_list sl;
+ struct snapshot *victim;
+ struct disk_space ds;
+ const char *why;
- cmdline_parser(argc, argv, &conf); /* aborts on errors */
- if (!conf.inputs_num) {
- ret = -E_SYNTAX;
- make_err_msg("no command given");
+ ret = get_disk_space(".", &ds);
+ if (ret < 0)
+ return ret;
+ log_disk_space(&ds);
+ dss_get_snapshot_list(&sl);
+ why = "outdated";
+ victim = find_outdated_snapshot(&sl);
+ if (victim)
+ goto rm;
+ why = "redundant";
+ victim = find_redundant_snapshot(&sl);
+ if (victim)
+ goto rm;
+ ret = 0;
+ goto out;
+rm:
+ if (conf.dry_run_given) {
+ dss_msg("%s snapshot %s (interval = %i)\n",
+ why, victim->name, victim->interval);
+ ret = 0;
goto out;
}
- ret = read_config_file();
+ ret = pre_remove_hook(victim, why);
if (ret < 0)
goto out;
- ret = check_config();
+ if (snapshot_removal_status == HS_PRE_RUNNING) {
+ ret = wait_for_remove_process();
+ if (ret < 0)
+ goto out;
+ if (snapshot_removal_status != HS_PRE_SUCCESS)
+ goto out;
+ }
+ ret = exec_rm();
+ if (ret < 0)
+ goto out;
+ ret = wait_for_remove_process();
+ if (ret < 0)
+ goto out;
+ if (snapshot_removal_status != HS_SUCCESS)
+ goto out;
+ ret = post_remove_hook();
+ if (ret < 0)
+ goto out;
+ if (snapshot_removal_status != HS_POST_RUNNING)
+ goto out;
+ ret = wait_for_remove_process();
+ if (ret < 0)
+ goto out;
+ ret = 1;
+out:
+ free_snapshot_list(&sl);
+ return ret;
+}
+
+static int com_create(void)
+{
+ int ret, status;
+ char **rsync_argv;
+
+ if (conf.dry_run_given) {
+ int i;
+ char *msg = NULL;
+ create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
+ for (i = 0; rsync_argv[i]; i++) {
+ char *tmp = msg;
+ msg = make_message("%s%s%s", tmp? tmp : "",
+ tmp? " " : "", rsync_argv[i]);
+ free(tmp);
+ }
+ free_rsync_argv(rsync_argv);
+ dss_msg("%s\n", msg);
+ free(msg);
+ return 1;
+ }
+ ret = pre_create_hook();
+ if (ret < 0)
+ return ret;
+ if (create_pid) {
+ ret = wait_for_process(create_pid, &status);
+ if (ret < 0)
+ return ret;
+ ret = handle_pre_create_hook_exit(status);
+ if (ret <= 0) /* error, or pre-create failed */
+ return ret;
+ }
+ create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
+ ret = create_snapshot(rsync_argv);
+ if (ret < 0)
+ goto out;
+ ret = wait_for_process(create_pid, &status);
+ if (ret < 0)
+ goto out;
+ ret = handle_rsync_exit(status);
+ if (ret < 0)
+ goto out;
+ post_create_hook();
+ if (create_pid)
+ ret = wait_for_process(create_pid, &status);
+out:
+ free_rsync_argv(rsync_argv);
+ return ret;
+}
+
+static int com_ls(void)
+{
+ int i;
+ struct snapshot_list sl;
+ struct snapshot *s;
+
+ dss_get_snapshot_list(&sl);
+ FOR_EACH_SNAPSHOT(s, i, &sl) {
+ int64_t d = 0;
+ if (s->flags & SS_COMPLETE)
+ d = (s->completion_time - s->creation_time) / 60;
+ dss_msg("%u\t%s\t%3" PRId64 ":%02" PRId64 "\n", s->interval, s->name, d/60, d%60);
+ };
+ free_snapshot_list(&sl);
+ return 1;
+}
+
+static int setup_signal_handling(void)
+{
+ int ret;
+
+ DSS_INFO_LOG("setting up signal handlers\n");
+ signal_pipe = signal_init(); /* always successful */
+ ret = install_sighandler(SIGINT);
+ if (ret < 0)
+ return ret;
+ ret = install_sighandler(SIGTERM);
+ if (ret < 0)
+ return ret;
+ return install_sighandler(SIGCHLD);
+}
+
+/**
+ * The main function of dss.
+ *
+ * \param argc Usual argument count.
+ * \param argv Usual argument vector.
+ */
+int main(int argc, char **argv)
+{
+ int ret;
+ struct cmdline_parser_params params = {
+ .override = 0,
+ .initialize = 1,
+ .check_required = 0,
+ .check_ambiguity = 0,
+ .print_errors = 1
+ };
+
+ cmdline_parser_ext(argc, argv, &conf, ¶ms); /* aborts on errors */
+ ret = parse_config_file(0);
+ if (ret < 0)
+ goto out;
+ if (ret == 0) { /* no config file given */
+ /*
+ * Parse the command line options again, but this time check
+ * that all required options are given.
+ */
+ params = (struct cmdline_parser_params) {
+ .override = 1,
+ .initialize = 1,
+ .check_required = 1,
+ .check_ambiguity = 1,
+ .print_errors = 1
+ };
+ cmdline_parser_ext(argc, argv, &conf, ¶ms); /* aborts on errors */
+ }
+ if (conf.daemon_given)
+ daemon_init();
+ ret = change_to_dest_dir();
if (ret < 0)
goto out;
- ret = dss_chdir(conf.dest_dir_arg);
+ ret = setup_signal_handling();
if (ret < 0)
goto out;
- ret = call_command_handler(conf.inputs_num, conf.inputs);
+ ret = call_command_handler();
out:
if (ret < 0)
- log_err_msg(EMERG, -ret);
- clean_exit(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE);
+ DSS_EMERG_LOG("%s\n", dss_strerror(-ret));
+ exit(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE);
}
projects / dss.git / blobdiff