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Copy pathtools.c
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294 lines (255 loc) · 6.24 KB
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#include <ccan/talloc/talloc.h>
#include <ccan/grab_file/grab_file.h>
#include <ccan/noerr/noerr.h>
#include <ccan/read_write_all/read_write_all.h>
#include <ccan/noerr/noerr.h>
#include <ccan/time/time.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 <err.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;
char *talloc_basename(const void *ctx, const char *dir)
{
char *p = strrchr(dir, '/');
if (!p)
return talloc_strdup(ctx, dir);
return talloc_strdup(ctx, p+1);
}
char *talloc_dirname(const void *ctx, const char *dir)
{
char *p = strrchr(dir, '/');
if (!p)
return talloc_strdup(ctx, ".");
return talloc_strndup(ctx, dir, p - dir);
}
char *talloc_getcwd(const void *ctx)
{
unsigned int len;
char *cwd;
/* *This* is why people hate C. */
len = 32;
cwd = talloc_array(ctx, char, len);
while (!getcwd(cwd, len)) {
if (errno != ERANGE) {
talloc_free(cwd);
return NULL;
}
cwd = talloc_realloc(ctx, cwd, char, len *= 2);
}
return cwd;
}
static void killme(int sig)
{
kill(-getpid(), SIGKILL);
}
char *run_with_timeout(const void *ctx, const char *cmd,
bool *ok, unsigned *timeout_ms)
{
pid_t pid;
int p[2];
char *ret;
int status, ms;
struct timeval start;
*ok = false;
if (pipe(p) != 0)
return talloc_asprintf(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 talloc_asprintf(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 = time_from_msec(*timeout_ms);
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]);
ret = grab_fd(ctx, p[0], NULL);
/* This shouldn't fail... */
if (waitpid(pid, &status, 0) != pid)
err(1, "Failed to wait for child");
ms = time_to_msec(time_sub(time_now(), start));
if (ms > *timeout_ms)
*timeout_ms = 0;
else
*timeout_ms -= ms;
close(p[0]);
if (tools_verbose) {
printf("%s", ret);
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 ret;
}
/* Tallocs *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 = talloc_strdup(ctx, "\n== TIMED OUT ==\n");
return false;
}
va_start(ap, fmt);
cmd = talloc_vasprintf(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 = talloc_asprintf_append(*output,
"\n== TIMED OUT ==\n");
return false;
}
static int 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);
return 0;
}
const char *temp_dir(const void *ctx)
{
/* For first call, create dir. */
while (!tmpdir) {
tmpdir = getenv("TMPDIR");
if (!tmpdir)
tmpdir = "/tmp";
tmpdir = talloc_asprintf(talloc_autofree_context(),
"%s/ccanlint-%u.%lu",
tmpdir, getpid(), random());
if (mkdir(tmpdir, 0700) != 0) {
if (errno == EEXIST) {
talloc_free(tmpdir);
tmpdir = NULL;
continue;
}
err(1, "mkdir %s failed", tmpdir);
}
talloc_set_destructor(tmpdir, unlink_all);
if (tools_verbose)
printf("Created temporary directory %s\n", tmpdir);
}
return tmpdir;
}
int unlink_file_destructor(char *filename)
{
unlink(filename);
return 0;
}
char *temp_file(const void *ctx, const char *extension, const char *srcname)
{
unsigned baselen;
char *f, *suffix = talloc_strdup(ctx, "");
struct stat st;
unsigned int count = 0;
srcname = talloc_basename(ctx, srcname);
if (strrchr(srcname, '.'))
baselen = strrchr(srcname, '.') - srcname;
else
baselen = strlen(srcname);
do {
f = talloc_asprintf(ctx, "%s/%.*s%s%s",
temp_dir(ctx),
baselen, srcname,
suffix, extension);
talloc_free(suffix);
suffix = talloc_asprintf(ctx, "-%u", ++count);
} while (lstat(f, &st) == 0);
if (tools_verbose)
printf("Creating file %s\n", f);
talloc_free(suffix);
return f;
}
bool move_file(const char *oldname, const char *newname)
{
char *contents;
size_t size;
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, &size);
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, size);
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:
talloc_free(contents);
return ret;
}