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Copy pathtools.c
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275 lines (238 loc) · 5.9 KB
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#include <ccan/take/take.h>
#include <ccan/err/err.h>
#include <ccan/noerr/noerr.h>
#include <ccan/rbuf/rbuf.h>
#include <ccan/read_write_all/read_write_all.h>
#include <ccan/noerr/noerr.h>
#include <ccan/time/time.h>
#include <ccan/tal/path/path.h>
#include <ccan/tal/grab_file/grab_file.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#include <signal.h>
#include "tools.h"
static const char *tmpdir = NULL;
bool tools_verbose = false;
/* Ten minutes. */
const unsigned int default_timeout_ms = 10 * 60 * 1000;
static void killme(int sig UNNEEDED)
{
kill(-getpid(), SIGKILL);
}
char *run_with_timeout(const void *ctx, const char *cmd,
bool *ok, unsigned *timeout_ms)
{
pid_t pid;
int p[2];
struct rbuf in;
int status;
unsigned int ms;
struct timeabs start;
*ok = false;
if (pipe(p) != 0)
return tal_fmt(ctx, "Failed to create pipe: %s",
strerror(errno));
if (tools_verbose)
printf("Running: %s\n", cmd);
/* Always flush buffers before fork! */
fflush(stdout);
start = time_now();
pid = fork();
if (pid == -1) {
close_noerr(p[0]);
close_noerr(p[1]);
return tal_fmt(ctx, "Failed to fork: %s", strerror(errno));
}
if (pid == 0) {
struct itimerval itim;
if (dup2(p[1], STDOUT_FILENO) != STDOUT_FILENO
|| dup2(p[1], STDERR_FILENO) != STDERR_FILENO
|| close(p[0]) != 0
|| close(STDIN_FILENO) != 0
|| open("/dev/null", O_RDONLY) != STDIN_FILENO)
exit(128);
signal(SIGALRM, killme);
itim.it_interval.tv_sec = itim.it_interval.tv_usec = 0;
itim.it_value = timespec_to_timeval(time_from_msec(*timeout_ms).ts);
setitimer(ITIMER_REAL, &itim, NULL);
status = system(cmd);
if (WIFEXITED(status))
exit(WEXITSTATUS(status));
/* Here's a hint... */
exit(128 + WTERMSIG(status));
}
close(p[1]);
rbuf_init(&in, p[0], tal_arr(ctx, char, 4096), 4096);
if (!rbuf_read_str(&in, 0, do_tal_realloc) && errno)
in.buf = tal_free(in.buf);
/* This shouldn't fail... */
if (waitpid(pid, &status, 0) != pid)
err(1, "Failed to wait for child");
ms = time_to_msec(time_between(time_now(), start));
if (ms > *timeout_ms)
*timeout_ms = 0;
else
*timeout_ms -= ms;
close(p[0]);
if (tools_verbose) {
printf("%s", in.buf);
printf("Finished: %u ms, %s %u\n", ms,
WIFEXITED(status) ? "exit status" : "killed by signal",
WIFEXITED(status) ? WEXITSTATUS(status)
: WTERMSIG(status));
}
*ok = (WIFEXITED(status) && WEXITSTATUS(status) == 0);
return in.buf;
}
/* Tals *output off ctx; return false if command fails. */
bool run_command(const void *ctx, unsigned int *time_ms, char **output,
const char *fmt, ...)
{
va_list ap;
char *cmd;
bool ok;
unsigned int default_time = default_timeout_ms;
if (!time_ms)
time_ms = &default_time;
else if (*time_ms == 0) {
*output = tal_strdup(ctx, "\n== TIMED OUT ==\n");
return false;
}
va_start(ap, fmt);
cmd = tal_vfmt(ctx, fmt, ap);
va_end(ap);
*output = run_with_timeout(ctx, cmd, &ok, time_ms);
if (ok)
return true;
if (!*output)
err(1, "Problem running child");
if (*time_ms == 0)
*output = tal_strcat(ctx, take(*output), "\n== TIMED OUT ==\n");
return false;
}
static void unlink_all(const char *dir)
{
char cmd[strlen(dir) + sizeof("rm -rf ")];
sprintf(cmd, "rm -rf %s", dir);
if (tools_verbose)
printf("Running: %s\n", cmd);
if (system(cmd) != 0)
warn("Could not remove temporary work in %s", dir);
}
static pid_t *afree;
static void free_autofree(void)
{
if (*afree == getpid())
tal_free(afree);
}
tal_t *autofree(void)
{
if (!afree) {
afree = tal(NULL, pid_t);
*afree = getpid();
atexit(free_autofree);
}
return afree;
}
const char *temp_dir(void)
{
/* For first call, create dir. */
while (!tmpdir) {
tmpdir = getenv("TMPDIR");
if (!tmpdir)
tmpdir = "/tmp";
tmpdir = tal_fmt(autofree(), "%s/ccanlint-%u.%lu",
tmpdir, getpid(), random());
if (mkdir(tmpdir, 0700) != 0) {
if (errno == EEXIST) {
tal_free(tmpdir);
tmpdir = NULL;
continue;
}
err(1, "mkdir %s failed", tmpdir);
}
tal_add_destructor(tmpdir, unlink_all);
if (tools_verbose)
printf("Created temporary directory %s\n", tmpdir);
}
return tmpdir;
}
void keep_temp_dir(void)
{
tal_del_destructor(temp_dir(), unlink_all);
}
char *temp_file(const void *ctx, const char *extension, const char *srcname)
{
char *f, *base, *suffix;
struct stat st;
unsigned int count = 0;
base = path_join(ctx, temp_dir(), take(path_basename(ctx, srcname)));
/* Trim extension. */
base[path_ext_off(base)] = '\0';
suffix = tal_strdup(ctx, extension);
do {
f = tal_strcat(ctx, base, suffix);
suffix = tal_fmt(base, "-%u%s", ++count, extension);
} while (lstat(f, &st) == 0);
if (tools_verbose)
printf("Creating file %s\n", f);
tal_free(base);
return f;
}
bool move_file(const char *oldname, const char *newname)
{
char *contents;
int fd;
bool ret;
if (tools_verbose)
printf("Moving file %s to %s: ", oldname, newname);
/* Simple case: rename works. */
if (rename(oldname, newname) == 0) {
if (tools_verbose)
printf("rename worked\n");
return true;
}
/* Try copy and delete: not atomic! */
contents = grab_file(NULL, oldname);
if (!contents) {
if (tools_verbose)
printf("read failed: %s\n", strerror(errno));
return false;
}
fd = open(newname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
if (fd < 0) {
if (tools_verbose)
printf("output open failed: %s\n", strerror(errno));
ret = false;
goto free;
}
ret = write_all(fd, contents, tal_count(contents)-1);
if (close(fd) != 0)
ret = false;
if (ret) {
if (tools_verbose)
printf("copy worked\n");
unlink(oldname);
} else {
if (tools_verbose)
printf("write/close failed\n");
unlink(newname);
}
free:
tal_free(contents);
return ret;
}
void *do_tal_realloc(void *p, size_t size)
{
tal_resize((char **)&p, size);
return p;
}