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util.c
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// Copyright (C) 2002 Andrew Tridgell
// Copyright (C) 2009-2018 Joel Rosdahl
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program; if not, write to the Free Software Foundation, Inc., 51
// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#include "ccache.h"
#include <zlib.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef _WIN32
#include <windows.h>
#include <sys/locking.h>
#include <psapi.h>
#include <tchar.h>
#endif
static FILE *logfile;
static bool
init_log(void)
{
extern struct conf *conf;
if (logfile) {
return true;
}
assert(conf);
if (str_eq(conf->log_file, "")) {
return false;
}
logfile = fopen(conf->log_file, "a");
if (logfile) {
#ifndef _WIN32
set_cloexec_flag(fileno(logfile));
#endif
return true;
} else {
return false;
}
}
static void
log_prefix(bool log_updated_time)
{
#ifdef HAVE_GETTIMEOFDAY
static char prefix[200];
if (log_updated_time) {
char timestamp[100];
struct tm *tm;
struct timeval tv;
gettimeofday(&tv, NULL);
#ifdef __MINGW64_VERSION_MAJOR
tm = localtime((time_t *)&tv.tv_sec);
#else
tm = localtime(&tv.tv_sec);
#endif
strftime(timestamp, sizeof(timestamp), "%Y-%m-%dT%H:%M:%S", tm);
snprintf(prefix, sizeof(prefix),
"[%s.%06d %-5d] ", timestamp, (int)tv.tv_usec, (int)getpid());
}
fputs(prefix, logfile);
#else
fprintf(logfile, "[%-5d] ", (int)getpid());
#endif
}
static long
path_max(const char *path)
{
#ifdef PATH_MAX
(void)path;
return PATH_MAX;
#elif defined(MAXPATHLEN)
(void)path;
return MAXPATHLEN;
#elif defined(_PC_PATH_MAX)
long maxlen = pathconf(path, _PC_PATH_MAX);
return maxlen >= 4096 ? maxlen : 4096;
#endif
}
// Warn about failure writing to the log file and then exit.
static void
warn_log_fail(void)
{
extern struct conf *conf;
// Note: Can't call fatal() since that would lead to recursion.
fprintf(stderr, "ccache: error: Failed to write to %s: %s\n",
conf->log_file, strerror(errno));
x_exit(EXIT_FAILURE);
}
static void
vlog(const char *format, va_list ap, bool log_updated_time)
{
if (!init_log()) {
return;
}
log_prefix(log_updated_time);
int rc1 = vfprintf(logfile, format, ap);
int rc2 = fprintf(logfile, "\n");
if (rc1 < 0 || rc2 < 0) {
warn_log_fail();
}
}
// Write a message to the log file (adding a newline) and flush.
void
cc_log(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vlog(format, ap, true);
va_end(ap);
if (logfile) {
fflush(logfile);
}
}
// Write a message to the log file (adding a newline) without flushing and with
// a reused timestamp.
void
cc_bulklog(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vlog(format, ap, false);
va_end(ap);
}
// Log an executed command to the CCACHE_LOGFILE location.
void
cc_log_argv(const char *prefix, char **argv)
{
if (!init_log()) {
return;
}
log_prefix(true);
fputs(prefix, logfile);
print_command(logfile, argv);
int rc = fflush(logfile);
if (rc) {
warn_log_fail();
}
}
// Something went badly wrong!
void
fatal(const char *format, ...)
{
va_list ap;
va_start(ap, format);
char msg[1000];
vsnprintf(msg, sizeof(msg), format, ap);
va_end(ap);
cc_log("FATAL: %s", msg);
fprintf(stderr, "ccache: error: %s\n", msg);
x_exit(1);
}
void
warn(const char *format, ...)
{
va_list ap;
va_start(ap, format);
char msg[1000];
vsnprintf(msg, sizeof(msg), format, ap);
va_end(ap);
cc_log("WARNING: %s", msg);
fprintf(stderr, "ccache: warning: %s\n", msg);
}
// Copy all data from fd_in to fd_out, decompressing data from fd_in if needed.
void
copy_fd(int fd_in, int fd_out)
{
gzFile gz_in = gzdopen(dup(fd_in), "rb");
if (!gz_in) {
fatal("Failed to copy fd");
}
int n;
char buf[READ_BUFFER_SIZE];
while ((n = gzread(gz_in, buf, sizeof(buf))) > 0) {
ssize_t written = 0;
do {
ssize_t count = write(fd_out, buf + written, n - written);
if (count == -1) {
if (errno != EAGAIN && errno != EINTR) {
fatal("Failed to copy fd");
}
} else {
written += count;
}
} while (written < n);
}
gzclose(gz_in);
}
#ifndef HAVE_MKSTEMP
// Cheap and nasty mkstemp replacement.
int
mkstemp(char *template)
{
mktemp(template);
return open(template, O_RDWR | O_CREAT | O_EXCL | O_BINARY, 0600);
}
#endif
#ifndef _WIN32
static mode_t
get_umask(void)
{
static bool mask_retrieved = false;
static mode_t mask;
if (!mask_retrieved) {
mask = umask(0);
umask(mask);
mask_retrieved = true;
}
return mask;
}
#endif
// Copy src to dest, decompressing src if needed. compress_level > 0 decides
// whether dest will be compressed, and with which compression level. Returns 0
// on success and -1 on failure. On failure, errno represents the error.
int
copy_file(const char *src, const char *dest, int compress_level)
{
int fd_out;
gzFile gz_in = NULL;
gzFile gz_out = NULL;
int saved_errno = 0;
// Open destination file.
char *tmp_name = x_strdup(dest);
fd_out = create_tmp_fd(&tmp_name);
cc_log("Copying %s to %s via %s (%scompressed)",
src, dest, tmp_name, compress_level > 0 ? "" : "un");
// Open source file.
int fd_in = open(src, O_RDONLY | O_BINARY);
if (fd_in == -1) {
saved_errno = errno;
cc_log("open error: %s", strerror(saved_errno));
goto error;
}
gz_in = gzdopen(fd_in, "rb");
if (!gz_in) {
saved_errno = errno;
cc_log("gzdopen(src) error: %s", strerror(saved_errno));
close(fd_in);
goto error;
}
if (compress_level > 0) {
// A gzip file occupies at least 20 bytes, so it will always occupy an
// entire filesystem block, even for empty files. Turn off compression for
// empty files to save some space.
struct stat st;
if (x_fstat(fd_in, &st) != 0) {
goto error;
}
if (file_size(&st) == 0) {
compress_level = 0;
}
}
if (compress_level > 0) {
gz_out = gzdopen(dup(fd_out), "wb");
if (!gz_out) {
saved_errno = errno;
cc_log("gzdopen(dest) error: %s", strerror(saved_errno));
goto error;
}
gzsetparams(gz_out, compress_level, Z_DEFAULT_STRATEGY);
}
int n;
char buf[READ_BUFFER_SIZE];
while ((n = gzread(gz_in, buf, sizeof(buf))) > 0) {
int written;
if (compress_level > 0) {
written = gzwrite(gz_out, buf, n);
} else {
written = 0;
do {
ssize_t count = write(fd_out, buf + written, n - written);
if (count == -1 && errno != EINTR) {
saved_errno = errno;
break;
}
written += count;
} while (written < n);
}
if (written != n) {
if (compress_level > 0) {
int errnum;
cc_log("gzwrite error: %s (errno: %s)",
gzerror(gz_in, &errnum),
strerror(saved_errno));
} else {
cc_log("write error: %s", strerror(saved_errno));
}
goto error;
}
}
// gzeof won't tell if there's an error in the trailing CRC, so we must check
// gzerror before considering everything OK.
int errnum;
gzerror(gz_in, &errnum);
if (!gzeof(gz_in) || (errnum != Z_OK && errnum != Z_STREAM_END)) {
saved_errno = errno;
cc_log("gzread error: %s (errno: %s)",
gzerror(gz_in, &errnum), strerror(saved_errno));
gzclose(gz_in);
if (gz_out) {
gzclose(gz_out);
}
close(fd_out);
tmp_unlink(tmp_name);
free(tmp_name);
return -1;
}
gzclose(gz_in);
gz_in = NULL;
if (gz_out) {
gzclose(gz_out);
gz_out = NULL;
}
#ifndef _WIN32
fchmod(fd_out, 0666 & ~get_umask());
#endif
// The close can fail on NFS if out of space.
if (close(fd_out) == -1) {
saved_errno = errno;
cc_log("close error: %s", strerror(saved_errno));
goto error;
}
if (x_rename(tmp_name, dest) == -1) {
saved_errno = errno;
cc_log("rename error: %s", strerror(saved_errno));
goto error;
}
free(tmp_name);
return 0;
error:
if (gz_in) {
gzclose(gz_in);
}
if (gz_out) {
gzclose(gz_out);
}
if (fd_out != -1) {
close(fd_out);
}
tmp_unlink(tmp_name);
free(tmp_name);
errno = saved_errno;
return -1;
}
// Run copy_file() and, if successful, delete the source file.
int
move_file(const char *src, const char *dest, int compress_level)
{
int ret = copy_file(src, dest, compress_level);
if (ret != -1) {
x_unlink(src);
}
return ret;
}
// Like move_file(), but assumes that src is uncompressed and that src and dest
// are on the same file system.
int
move_uncompressed_file(const char *src, const char *dest, int compress_level)
{
if (compress_level > 0) {
return move_file(src, dest, compress_level);
} else {
return x_rename(src, dest);
}
}
// Test if a file is zlib compressed.
bool
file_is_compressed(const char *filename)
{
FILE *f = fopen(filename, "rb");
if (!f) {
return false;
}
// Test if file starts with 1F8B, which is zlib's magic number.
if ((fgetc(f) != 0x1f) || (fgetc(f) != 0x8b)) {
fclose(f);
return false;
}
fclose(f);
return true;
}
// Make sure a directory exists.
int
create_dir(const char *dir)
{
struct stat st;
if (stat(dir, &st) == 0) {
if (S_ISDIR(st.st_mode)) {
return 0;
}
errno = ENOTDIR;
return 1;
}
if (mkdir(dir, 0777) != 0 && errno != EEXIST) {
return 1;
}
return 0;
}
// Create directories leading to path. Returns 0 on success, otherwise -1.
int
create_parent_dirs(const char *path)
{
int res;
char *parent = dirname(path);
struct stat st;
if (stat(parent, &st) == 0) {
if (S_ISDIR(st.st_mode)) {
res = 0;
} else {
res = -1;
errno = ENOTDIR;
}
} else {
res = create_parent_dirs(parent);
if (res == 0) {
res = mkdir(parent, 0777);
// Have to handle the condition of the directory already existing because
// the file system could have changed in between calling stat and
// actually creating the directory. This can happen when there are
// multiple instances of ccache running and trying to create the same
// directory chain, which usually is the case when the cache root does
// not initially exist. As long as one of the processes creates the
// directories then our condition is satisfied and we avoid a race
// condition.
if (res != 0 && errno == EEXIST) {
res = 0;
}
} else {
res = -1;
}
}
free(parent);
return res;
}
// Return a static string with the current hostname.
const char *
get_hostname(void)
{
static char hostname[260] = "";
if (hostname[0]) {
return hostname;
}
strcpy(hostname, "unknown");
#if HAVE_GETHOSTNAME
gethostname(hostname, sizeof(hostname) - 1);
#elif defined(_WIN32)
const char *computer_name = getenv("COMPUTERNAME");
if (computer_name) {
snprintf(hostname, sizeof(hostname), "%s", computer_name);
return hostname;
}
WORD w_version_requested = MAKEWORD(2, 2);
WSADATA wsa_data;
int err = WSAStartup(w_version_requested, &wsa_data);
if (err != 0) {
// Tell the user that we could not find a usable Winsock DLL.
cc_log("WSAStartup failed with error: %d", err);
return hostname;
}
if (LOBYTE(wsa_data.wVersion) != 2 || HIBYTE(wsa_data.wVersion) != 2) {
// Tell the user that we could not find a usable WinSock DLL.
cc_log("Could not find a usable version of Winsock.dll");
WSACleanup();
return hostname;
}
int result = gethostname(hostname, sizeof(hostname) - 1);
if (result != 0) {
LPVOID lp_msg_buf;
DWORD dw = WSAGetLastError();
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, dw, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lp_msg_buf, 0, NULL);
LPVOID lp_display_buf = (LPVOID) LocalAlloc(
LMEM_ZEROINIT,
(lstrlen((LPCTSTR) lp_msg_buf) + lstrlen((LPCTSTR) __FILE__) + 200)
* sizeof(TCHAR));
_snprintf((LPTSTR) lp_display_buf,
LocalSize(lp_display_buf) / sizeof(TCHAR),
TEXT("%s failed with error %lu: %s"), __FILE__, dw,
(const char *)lp_msg_buf);
cc_log("can't get hostname OS returned error: %s", (char *)lp_display_buf);
LocalFree(lp_msg_buf);
LocalFree(lp_display_buf);
}
WSACleanup();
#endif
hostname[sizeof(hostname) - 1] = 0;
return hostname;
}
// Return a string to be passed to mkstemp to create a temporary file. Also
// tries to cope with NFS by adding the local hostname.
const char *
tmp_string(void)
{
static char *ret;
if (!ret) {
ret = format("%s.%u.XXXXXX", get_hostname(), (unsigned)getpid());
}
return ret;
}
// Return the hash result as a hex string. Size -1 means don't include size
// suffix. Caller frees.
char *
format_hash_as_string(const unsigned char *hash, int size)
{
int i;
char *ret = x_malloc(53);
for (i = 0; i < 16; i++) {
sprintf(&ret[i*2], "%02x", (unsigned) hash[i]);
}
if (size >= 0) {
sprintf(&ret[i*2], "-%d", size);
}
return ret;
}
char const CACHEDIR_TAG[] =
"Signature: 8a477f597d28d172789f06886806bc55\n"
"# This file is a cache directory tag created by ccache.\n"
"# For information about cache directory tags, see:\n"
"#\thttp://www.brynosaurus.com/cachedir/\n";
int
create_cachedirtag(const char *dir)
{
char *filename = format("%s/CACHEDIR.TAG", dir);
struct stat st;
if (stat(filename, &st) == 0) {
if (S_ISREG(st.st_mode)) {
goto success;
}
errno = EEXIST;
goto error;
}
FILE *f = fopen(filename, "w");
if (!f) {
goto error;
}
if (fwrite(CACHEDIR_TAG, sizeof(CACHEDIR_TAG)-1, 1, f) != 1) {
fclose(f);
goto error;
}
if (fclose(f)) {
goto error;
}
success:
free(filename);
return 0;
error:
free(filename);
return 1;
}
// Construct a string according to a format. Caller frees.
char *
format(const char *format, ...)
{
va_list ap;
va_start(ap, format);
char *ptr = NULL;
if (vasprintf(&ptr, format, ap) == -1) {
fatal("Out of memory in format");
}
va_end(ap);
if (!*ptr) {
fatal("Internal error in format");
}
return ptr;
}
// This is like strdup() but dies if the malloc fails.
char *
x_strdup(const char *s)
{
char *ret = strdup(s);
if (!ret) {
fatal("Out of memory in x_strdup");
}
return ret;
}
// This is like strndup() but dies if the malloc fails.
char *
x_strndup(const char *s, size_t n)
{
#ifndef HAVE_STRNDUP
if (!s) {
return NULL;
}
size_t m = 0;
while (m < n && s[m]) {
m++;
}
char *ret = malloc(m + 1);
if (ret) {
memcpy(ret, s, m);
ret[m] = '\0';
}
#else
char *ret = strndup(s, n);
#endif
if (!ret) {
fatal("x_strndup: Could not allocate %lu bytes", (unsigned long)n);
}
return ret;
}
// This is like malloc() but dies if the malloc fails.
void *
x_malloc(size_t size)
{
if (size == 0) {
// malloc() may return NULL if size is zero, so always do this to make sure
// that the code handles it regardless of platform.
return NULL;
}
void *ret = malloc(size);
if (!ret) {
fatal("x_malloc: Could not allocate %lu bytes", (unsigned long)size);
}
return ret;
}
// This is like calloc() but dies if the allocation fails.
void *
x_calloc(size_t nmemb, size_t size)
{
if (nmemb * size == 0) {
// calloc() may return NULL if nmemb or size is 0, so always do this to
// make sure that the code handles it regardless of platform.
return NULL;
}
void *ret = calloc(nmemb, size);
if (!ret) {
fatal("x_calloc: Could not allocate %lu bytes", (unsigned long)size);
}
return ret;
}
// This is like realloc() but dies if the malloc fails.
void *
x_realloc(void *ptr, size_t size)
{
if (!ptr) {
return x_malloc(size);
}
void *p2 = realloc(ptr, size);
if (!p2) {
fatal("x_realloc: Could not allocate %lu bytes", (unsigned long)size);
}
return p2;
}
// This is like unsetenv.
void x_unsetenv(const char *name)
{
#ifdef HAVE_UNSETENV
unsetenv(name);
#else
putenv(x_strdup(name)); // Leak to environment.
#endif
}
// Like fstat() but also call cc_log on failure.
int
x_fstat(int fd, struct stat *buf)
{
int result = fstat(fd, buf);
if (result != 0) {
cc_log("Failed to fstat fd %d: %s", fd, strerror(errno));
}
return result;
}
// Like lstat() but also call cc_log on failure.
int
x_lstat(const char *pathname, struct stat *buf)
{
int result = lstat(pathname, buf);
if (result != 0) {
cc_log("Failed to lstat %s: %s", pathname, strerror(errno));
}
return result;
}
// Like stat() but also call cc_log on failure.
int
x_stat(const char *pathname, struct stat *buf)
{
int result = stat(pathname, buf);
if (result != 0) {
cc_log("Failed to stat %s: %s", pathname, strerror(errno));
}
return result;
}
// Construct a string according to the format and store it in *ptr. The
// original *ptr is then freed.
void
reformat(char **ptr, const char *format, ...)
{
char *saved = *ptr;
*ptr = NULL;
va_list ap;
va_start(ap, format);
if (vasprintf(ptr, format, ap) == -1) {
fatal("Out of memory in reformat");
}
va_end(ap);
if (!ptr) {
fatal("Out of memory in reformat");
}
if (saved) {
free(saved);
}
}
// Recursive directory traversal. fn() is called on all entries in the tree.
void
traverse(const char *dir, void (*fn)(const char *, struct stat *))
{
DIR *d = opendir(dir);
if (!d) {
return;
}
struct dirent *de;
while ((de = readdir(d))) {
if (str_eq(de->d_name, ".")) {
continue;
}
if (str_eq(de->d_name, "..")) {
continue;
}
if (strlen(de->d_name) == 0) {
continue;
}
char *fname = format("%s/%s", dir, de->d_name);
struct stat st;
if (lstat(fname, &st)) {
if (errno != ENOENT && errno != ESTALE) {
fatal("lstat %s failed: %s", fname, strerror(errno));
}
free(fname);
continue;
}
if (S_ISDIR(st.st_mode)) {
traverse(fname, fn);
}
fn(fname, &st);
free(fname);
}
closedir(d);
}
// Return the base name of a file - caller frees.
char *
basename(const char *path)
{
char *p = strrchr(path, '/');
if (p) {
path = p + 1;
}
#ifdef _WIN32
p = strrchr(path, '\\');
if (p) {
path = p + 1;
}
#endif
return x_strdup(path);
}
// Return the dir name of a file - caller frees.
char *
dirname(const char *path)
{
char *s = x_strdup(path);
char *p = strrchr(s, '/');
#ifdef _WIN32
char *p2 = strrchr(s, '\\');
if (!p || (p2 && p < p2)) {
p = p2;
}
#endif
if (!p) {
free(s);
s = x_strdup(".");
} else if (p == s) {
*(p + 1) = 0;
} else {
*p = 0;
}
return s;
}
// Return the file extension (including the dot) of a path as a pointer into
// path. If path has no file extension, the empty string and the end of path is
// returned.
const char *
get_extension(const char *path)
{
size_t len = strlen(path);
for (const char *p = &path[len - 1]; p >= path; --p) {
if (*p == '.') {
return p;
}
if (*p == '/') {
break;
}
}
return &path[len];
}
// Return a string containing the given path without the filename extension.
// Caller frees.
char *
remove_extension(const char *path)
{
return x_strndup(path, strlen(path) - strlen(get_extension(path)));
}
// Return size on disk of a file.
size_t
file_size(struct stat *st)
{
#ifdef _WIN32
return (st->st_size + 1023) & ~1023;
#else
size_t size = st->st_blocks * 512;
if ((size_t)st->st_size > size) {
// Probably a broken stat() call...
size = (st->st_size + 1023) & ~1023;
}
return size;
#endif
}
// Format a size as a human-readable string. Caller frees.
char *
format_human_readable_size(uint64_t v)
{
char *s;
if (v >= 1000*1000*1000) {
s = format("%.1f GB", v/((double)(1000*1000*1000)));
} else if (v >= 1000*1000) {
s = format("%.1f MB", v/((double)(1000*1000)));
} else {
s = format("%.1f kB", v/((double)(1000)));
}
return s;
}
// Format a size as a parsable string. Caller frees.
char *
format_parsable_size_with_suffix(uint64_t size)
{
char *s;
if (size >= 1000*1000*1000) {
s = format("%.1fG", size / ((double)(1000*1000*1000)));
} else if (size >= 1000*1000) {
s = format("%.1fM", size / ((double)(1000*1000)));
} else if (size >= 1000) {
s = format("%.1fk", size / ((double)(1000)));
} else {
s = format("%u", (unsigned)size);
}
return s;
}
// Parse a "size value", i.e. a string that can end in k, M, G, T (10-based
// suffixes) or Ki, Mi, Gi, Ti (2-based suffixes). For backward compatibility,
// K is also recognized as a synonym of k.
bool
parse_size_with_suffix(const char *str, uint64_t *size)
{
errno = 0;
char *p;
double x = strtod(str, &p);
if (errno != 0 || x < 0 || p == str || *str == '\0') {
return false;
}
while (isspace(*p)) {
++p;
}
if (*p != '\0') {
unsigned multiplier = *(p+1) == 'i' ? 1024 : 1000;
switch (*p) {
case 'T':
x *= multiplier;
// Fallthrough.
case 'G':
x *= multiplier;
// Fallthrough.
case 'M':
x *= multiplier;
// Fallthrough.
case 'K':
case 'k':
x *= multiplier;
break;
default:
return false;
}
} else {
// Default suffix: G.
x *= 1000 * 1000 * 1000;
}
*size = x;
return true;