flock: add --verbose option
Jenkins script jobs using flock are a great example of a situation in which one may want an automation to be verbose, so that when unexpected events happen there is more hints in logs. Reviewed-by: Benno Schulenberg <bensberg@justemail.net> Signed-off-by: Sami Kerola <kerolasa@iki.fi>
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@ -1,8 +1,8 @@
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if BUILD_FLOCK
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usrbin_exec_PROGRAMS += flock
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dist_man_MANS += sys-utils/flock.1
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flock_SOURCES = sys-utils/flock.c
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flock_LDADD = $(LDADD) libcommon.la
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flock_SOURCES = sys-utils/flock.c lib/monotonic.c
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flock_LDADD = $(LDADD) libcommon.la $(CLOCKGETTIME_LIBS)
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endif
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if BUILD_IPCMK
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@ -107,6 +107,10 @@ option for the exit code used. The zero number of
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.IR seconds
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is interpreted as \fB\-\-nonblock\fR.
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.TP
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.B \-\-verbose
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Report how long it took to acquire the lock, or why the lock could not be
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obtained.
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.TP
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.BR \-V , " \-\-version"
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Display version information and exit.
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.TP
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@ -44,6 +44,7 @@
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#include "strutils.h"
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#include "closestream.h"
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#include "timer.h"
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#include "monotonic.h"
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static void __attribute__((__noreturn__)) usage(int ex)
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{
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@ -66,6 +67,7 @@ static void __attribute__((__noreturn__)) usage(int ex)
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fputs(_( " -E, --conflict-exit-code <number> exit code after conflict or timeout\n"), stderr);
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fputs(_( " -o, --close close file descriptor before running command\n"), stderr);
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fputs(_( " -c, --command <command> run a single command string through the shell\n"), stderr);
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fputs(_( " --verbose increase verbosity\n"), stderr);
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fprintf(stderr, USAGE_SEPARATOR);
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fprintf(stderr, USAGE_HELP);
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fprintf(stderr, USAGE_VERSION);
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@ -120,6 +122,8 @@ int main(int argc, char *argv[])
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int opt, ix;
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int do_close = 0;
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int status;
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int verbose = 0;
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struct timeval time_start, time_done;
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/*
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* The default exit code for lock conflict or timeout
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* is specified in man flock.1
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@ -128,7 +132,9 @@ int main(int argc, char *argv[])
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char **cmd_argv = NULL, *sh_c_argv[4];
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const char *filename = NULL;
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struct sigaction old_sa;
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enum {
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OPT_VERBOSE = CHAR_MAX + 1
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};
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static const struct option long_options[] = {
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{"shared", no_argument, NULL, 's'},
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{"exclusive", no_argument, NULL, 'x'},
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@ -139,6 +145,7 @@ int main(int argc, char *argv[])
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{"wait", required_argument, NULL, 'w'},
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{"conflict-exit-code", required_argument, NULL, 'E'},
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{"close", no_argument, NULL, 'o'},
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{"verbose", no_argument, NULL, OPT_VERBOSE},
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{"help", no_argument, NULL, 'h'},
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{"version", no_argument, NULL, 'V'},
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{NULL, 0, NULL, 0}
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@ -184,6 +191,9 @@ int main(int argc, char *argv[])
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conflict_exit_code = strtos32_or_err(optarg,
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_("invalid exit code"));
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break;
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case OPT_VERBOSE:
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verbose = 1;
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break;
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case 'V':
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printf(UTIL_LINUX_VERSION);
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exit(EX_OK);
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@ -239,16 +249,23 @@ int main(int argc, char *argv[])
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setup_timer(&timeout, &old_timer, &old_sa, timeout_handler);
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}
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if (verbose)
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gettime_monotonic(&time_start);
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while (flock(fd, type | block)) {
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switch (errno) {
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case EWOULDBLOCK:
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/* -n option set and failed to lock. */
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if (verbose)
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warnx(_("failed to get lock"));
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exit(conflict_exit_code);
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case EINTR:
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/* Signal received */
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if (timeout_expired)
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if (timeout_expired) {
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/* -w option set and failed to lock. */
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if (verbose)
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warnx(_("timeout while waiting to get lock"));
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exit(conflict_exit_code);
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}
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/* otherwise try again */
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continue;
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case EIO:
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@ -282,13 +299,23 @@ int main(int argc, char *argv[])
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if (have_timeout)
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cancel_timer(&old_timer, &old_sa);
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if (verbose) {
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struct timeval delta;
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gettime_monotonic(&time_done);
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timersub(&time_done, &time_start, &delta);
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printf(_("%s: getting lock took %ld.%06ld seconds\n"),
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program_invocation_short_name, delta.tv_sec,
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delta.tv_usec);
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}
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status = EX_OK;
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if (cmd_argv) {
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pid_t w, f;
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/* Clear any inherited settings */
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signal(SIGCHLD, SIG_DFL);
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if (verbose)
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printf(_("%s: executing %s\n"), program_invocation_short_name, cmd_argv[2]);
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f = fork();
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if (f < 0) {
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