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-rw-r--r--wrapper.c512
1 files changed, 401 insertions, 111 deletions
diff --git a/wrapper.c b/wrapper.c
index c9be1400c0..c1a663fd59 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -3,11 +3,46 @@
*/
#include "cache.h"
+static void do_nothing(size_t size)
+{
+}
+
+static void (*try_to_free_routine)(size_t size) = do_nothing;
+
+static int memory_limit_check(size_t size, int gentle)
+{
+ static size_t limit = 0;
+ if (!limit) {
+ limit = git_env_ulong("GIT_ALLOC_LIMIT", 0);
+ if (!limit)
+ limit = SIZE_MAX;
+ }
+ if (size > limit) {
+ if (gentle) {
+ error("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX,
+ (uintmax_t)size, (uintmax_t)limit);
+ return -1;
+ } else
+ die("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX,
+ (uintmax_t)size, (uintmax_t)limit);
+ }
+ return 0;
+}
+
+try_to_free_t set_try_to_free_routine(try_to_free_t routine)
+{
+ try_to_free_t old = try_to_free_routine;
+ if (!routine)
+ routine = do_nothing;
+ try_to_free_routine = routine;
+ return old;
+}
+
char *xstrdup(const char *str)
{
char *ret = strdup(str);
if (!ret) {
- release_pack_memory(strlen(str) + 1, -1);
+ try_to_free_routine(strlen(str) + 1);
ret = strdup(str);
if (!ret)
die("Out of memory, strdup failed");
@@ -15,18 +50,30 @@ char *xstrdup(const char *str)
return ret;
}
-void *xmalloc(size_t size)
+static void *do_xmalloc(size_t size, int gentle)
{
- void *ret = malloc(size);
+ void *ret;
+
+ if (memory_limit_check(size, gentle))
+ return NULL;
+ ret = malloc(size);
if (!ret && !size)
ret = malloc(1);
if (!ret) {
- release_pack_memory(size, -1);
+ try_to_free_routine(size);
ret = malloc(size);
if (!ret && !size)
ret = malloc(1);
- if (!ret)
- die("Out of memory, malloc failed");
+ if (!ret) {
+ if (!gentle)
+ die("Out of memory, malloc failed (tried to allocate %lu bytes)",
+ (unsigned long)size);
+ else {
+ error("Out of memory, malloc failed (tried to allocate %lu bytes)",
+ (unsigned long)size);
+ return NULL;
+ }
+ }
}
#ifdef XMALLOC_POISON
memset(ret, 0xA5, size);
@@ -34,6 +81,37 @@ void *xmalloc(size_t size)
return ret;
}
+void *xmalloc(size_t size)
+{
+ return do_xmalloc(size, 0);
+}
+
+static void *do_xmallocz(size_t size, int gentle)
+{
+ void *ret;
+ if (unsigned_add_overflows(size, 1)) {
+ if (gentle) {
+ error("Data too large to fit into virtual memory space.");
+ return NULL;
+ } else
+ die("Data too large to fit into virtual memory space.");
+ }
+ ret = do_xmalloc(size + 1, gentle);
+ if (ret)
+ ((char*)ret)[size] = 0;
+ return ret;
+}
+
+void *xmallocz(size_t size)
+{
+ return do_xmallocz(size, 0);
+}
+
+void *xmallocz_gently(size_t size)
+{
+ return do_xmallocz(size, 1);
+}
+
/*
* xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
* "data" to the allocated memory, zero terminates the allocated memory,
@@ -42,10 +120,7 @@ void *xmalloc(size_t size)
*/
void *xmemdupz(const void *data, size_t len)
{
- char *p = xmalloc(len + 1);
- memcpy(p, data, len);
- p[len] = '\0';
- return p;
+ return memcpy(xmallocz(len), data, len);
}
char *xstrndup(const char *str, size_t len)
@@ -56,11 +131,14 @@ char *xstrndup(const char *str, size_t len)
void *xrealloc(void *ptr, size_t size)
{
- void *ret = realloc(ptr, size);
+ void *ret;
+
+ memory_limit_check(size, 0);
+ ret = realloc(ptr, size);
if (!ret && !size)
ret = realloc(ptr, 1);
if (!ret) {
- release_pack_memory(size, -1);
+ try_to_free_routine(size);
ret = realloc(ptr, size);
if (!ret && !size)
ret = realloc(ptr, 1);
@@ -72,11 +150,14 @@ void *xrealloc(void *ptr, size_t size)
void *xcalloc(size_t nmemb, size_t size)
{
- void *ret = calloc(nmemb, size);
+ void *ret;
+
+ memory_limit_check(size * nmemb, 0);
+ ret = calloc(nmemb, size);
if (!ret && (!nmemb || !size))
ret = calloc(1, 1);
if (!ret) {
- release_pack_memory(nmemb * size, -1);
+ try_to_free_routine(nmemb * size);
ret = calloc(nmemb, size);
if (!ret && (!nmemb || !size))
ret = calloc(1, 1);
@@ -86,20 +167,27 @@ void *xcalloc(size_t nmemb, size_t size)
return ret;
}
-void *xmmap(void *start, size_t length,
- int prot, int flags, int fd, off_t offset)
-{
- void *ret = mmap(start, length, prot, flags, fd, offset);
- if (ret == MAP_FAILED) {
- if (!length)
- return NULL;
- release_pack_memory(length, fd);
- ret = mmap(start, length, prot, flags, fd, offset);
- if (ret == MAP_FAILED)
- die_errno("Out of memory? mmap failed");
- }
- return ret;
-}
+/*
+ * Limit size of IO chunks, because huge chunks only cause pain. OS X
+ * 64-bit is buggy, returning EINVAL if len >= INT_MAX; and even in
+ * the absence of bugs, large chunks can result in bad latencies when
+ * you decide to kill the process.
+ *
+ * We pick 8 MiB as our default, but if the platform defines SSIZE_MAX
+ * that is smaller than that, clip it to SSIZE_MAX, as a call to
+ * read(2) or write(2) larger than that is allowed to fail. As the last
+ * resort, we allow a port to pass via CFLAGS e.g. "-DMAX_IO_SIZE=value"
+ * to override this, if the definition of SSIZE_MAX given by the platform
+ * is broken.
+ */
+#ifndef MAX_IO_SIZE
+# define MAX_IO_SIZE_DEFAULT (8*1024*1024)
+# if defined(SSIZE_MAX) && (SSIZE_MAX < MAX_IO_SIZE_DEFAULT)
+# define MAX_IO_SIZE SSIZE_MAX
+# else
+# define MAX_IO_SIZE MAX_IO_SIZE_DEFAULT
+# endif
+#endif
/*
* xread() is the same a read(), but it automatically restarts read()
@@ -109,6 +197,8 @@ void *xmmap(void *start, size_t length,
ssize_t xread(int fd, void *buf, size_t len)
{
ssize_t nr;
+ if (len > MAX_IO_SIZE)
+ len = MAX_IO_SIZE;
while (1) {
nr = read(fd, buf, len);
if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
@@ -125,6 +215,8 @@ ssize_t xread(int fd, void *buf, size_t len)
ssize_t xwrite(int fd, const void *buf, size_t len)
{
ssize_t nr;
+ if (len > MAX_IO_SIZE)
+ len = MAX_IO_SIZE;
while (1) {
nr = write(fd, buf, len);
if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
@@ -133,6 +225,24 @@ ssize_t xwrite(int fd, const void *buf, size_t len)
}
}
+/*
+ * xpread() is the same as pread(), but it automatically restarts pread()
+ * operations with a recoverable error (EAGAIN and EINTR). xpread() DOES
+ * NOT GUARANTEE that "len" bytes is read even if the data is available.
+ */
+ssize_t xpread(int fd, void *buf, size_t len, off_t offset)
+{
+ ssize_t nr;
+ if (len > MAX_IO_SIZE)
+ len = MAX_IO_SIZE;
+ while (1) {
+ nr = pread(fd, buf, len, offset);
+ if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
+ continue;
+ return nr;
+ }
+}
+
ssize_t read_in_full(int fd, void *buf, size_t count)
{
char *p = buf;
@@ -140,8 +250,10 @@ ssize_t read_in_full(int fd, void *buf, size_t count)
while (count > 0) {
ssize_t loaded = xread(fd, p, count);
- if (loaded <= 0)
- return total ? total : loaded;
+ if (loaded < 0)
+ return -1;
+ if (loaded == 0)
+ return total;
count -= loaded;
p += loaded;
total += loaded;
@@ -171,6 +283,26 @@ ssize_t write_in_full(int fd, const void *buf, size_t count)
return total;
}
+ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset)
+{
+ char *p = buf;
+ ssize_t total = 0;
+
+ while (count > 0) {
+ ssize_t loaded = xpread(fd, p, count, offset);
+ if (loaded < 0)
+ return -1;
+ if (loaded == 0)
+ return total;
+ count -= loaded;
+ p += loaded;
+ total += loaded;
+ offset += loaded;
+ }
+
+ return total;
+}
+
int xdup(int fd)
{
int ret = dup(fd);
@@ -190,118 +322,276 @@ FILE *xfdopen(int fd, const char *mode)
int xmkstemp(char *template)
{
int fd;
+ char origtemplate[PATH_MAX];
+ strlcpy(origtemplate, template, sizeof(origtemplate));
fd = mkstemp(template);
- if (fd < 0)
- die_errno("Unable to create temporary file");
+ if (fd < 0) {
+ int saved_errno = errno;
+ const char *nonrelative_template;
+
+ if (strlen(template) != strlen(origtemplate))
+ template = origtemplate;
+
+ nonrelative_template = absolute_path(template);
+ errno = saved_errno;
+ die_errno("Unable to create temporary file '%s'",
+ nonrelative_template);
+ }
return fd;
}
-/*
- * zlib wrappers to make sure we don't silently miss errors
- * at init time.
- */
-void git_inflate_init(z_streamp strm)
-{
- const char *err;
-
- switch (inflateInit(strm)) {
- case Z_OK:
- return;
-
- case Z_MEM_ERROR:
- err = "out of memory";
- break;
- case Z_VERSION_ERROR:
- err = "wrong version";
- break;
- default:
- err = "error";
+/* git_mkstemp() - create tmp file honoring TMPDIR variable */
+int git_mkstemp(char *path, size_t len, const char *template)
+{
+ const char *tmp;
+ size_t n;
+
+ tmp = getenv("TMPDIR");
+ if (!tmp)
+ tmp = "/tmp";
+ n = snprintf(path, len, "%s/%s", tmp, template);
+ if (len <= n) {
+ errno = ENAMETOOLONG;
+ return -1;
}
- die("inflateInit: %s (%s)", err, strm->msg ? strm->msg : "no message");
+ return mkstemp(path);
}
-void git_inflate_end(z_streamp strm)
+/* git_mkstemps() - create tmp file with suffix honoring TMPDIR variable. */
+int git_mkstemps(char *path, size_t len, const char *template, int suffix_len)
{
- if (inflateEnd(strm) != Z_OK)
- error("inflateEnd: %s", strm->msg ? strm->msg : "failed");
+ const char *tmp;
+ size_t n;
+
+ tmp = getenv("TMPDIR");
+ if (!tmp)
+ tmp = "/tmp";
+ n = snprintf(path, len, "%s/%s", tmp, template);
+ if (len <= n) {
+ errno = ENAMETOOLONG;
+ return -1;
+ }
+ return mkstemps(path, suffix_len);
}
-int git_inflate(z_streamp strm, int flush)
-{
- int ret = inflate(strm, flush);
- const char *err;
+/* Adapted from libiberty's mkstemp.c. */
- switch (ret) {
- /* Out of memory is fatal. */
- case Z_MEM_ERROR:
- die("inflate: out of memory");
+#undef TMP_MAX
+#define TMP_MAX 16384
- /* Data corruption errors: we may want to recover from them (fsck) */
- case Z_NEED_DICT:
- err = "needs dictionary"; break;
- case Z_DATA_ERROR:
- err = "data stream error"; break;
- case Z_STREAM_ERROR:
- err = "stream consistency error"; break;
- default:
- err = "unknown error"; break;
+int git_mkstemps_mode(char *pattern, int suffix_len, int mode)
+{
+ static const char letters[] =
+ "abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "0123456789";
+ static const int num_letters = 62;
+ uint64_t value;
+ struct timeval tv;
+ char *template;
+ size_t len;
+ int fd, count;
+
+ len = strlen(pattern);
+
+ if (len < 6 + suffix_len) {
+ errno = EINVAL;
+ return -1;
+ }
- /* Z_BUF_ERROR: normal, needs more space in the output buffer */
- case Z_BUF_ERROR:
- case Z_OK:
- case Z_STREAM_END:
- return ret;
+ if (strncmp(&pattern[len - 6 - suffix_len], "XXXXXX", 6)) {
+ errno = EINVAL;
+ return -1;
}
- error("inflate: %s (%s)", err, strm->msg ? strm->msg : "no message");
- return ret;
+
+ /*
+ * Replace pattern's XXXXXX characters with randomness.
+ * Try TMP_MAX different filenames.
+ */
+ gettimeofday(&tv, NULL);
+ value = ((size_t)(tv.tv_usec << 16)) ^ tv.tv_sec ^ getpid();
+ template = &pattern[len - 6 - suffix_len];
+ for (count = 0; count < TMP_MAX; ++count) {
+ uint64_t v = value;
+ /* Fill in the random bits. */
+ template[0] = letters[v % num_letters]; v /= num_letters;
+ template[1] = letters[v % num_letters]; v /= num_letters;
+ template[2] = letters[v % num_letters]; v /= num_letters;
+ template[3] = letters[v % num_letters]; v /= num_letters;
+ template[4] = letters[v % num_letters]; v /= num_letters;
+ template[5] = letters[v % num_letters]; v /= num_letters;
+
+ fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode);
+ if (fd >= 0)
+ return fd;
+ /*
+ * Fatal error (EPERM, ENOSPC etc).
+ * It doesn't make sense to loop.
+ */
+ if (errno != EEXIST)
+ break;
+ /*
+ * This is a random value. It is only necessary that
+ * the next TMP_MAX values generated by adding 7777 to
+ * VALUE are different with (module 2^32).
+ */
+ value += 7777;
+ }
+ /* We return the null string if we can't find a unique file name. */
+ pattern[0] = '\0';
+ return -1;
+}
+
+int git_mkstemp_mode(char *pattern, int mode)
+{
+ /* mkstemp is just mkstemps with no suffix */
+ return git_mkstemps_mode(pattern, 0, mode);
}
-int odb_mkstemp(char *template, size_t limit, const char *pattern)
+#ifdef NO_MKSTEMPS
+int gitmkstemps(char *pattern, int suffix_len)
+{
+ return git_mkstemps_mode(pattern, suffix_len, 0600);
+}
+#endif
+
+int xmkstemp_mode(char *template, int mode)
{
int fd;
+ char origtemplate[PATH_MAX];
+ strlcpy(origtemplate, template, sizeof(origtemplate));
- snprintf(template, limit, "%s/%s",
- get_object_directory(), pattern);
- fd = mkstemp(template);
- if (0 <= fd)
- return fd;
+ fd = git_mkstemp_mode(template, mode);
+ if (fd < 0) {
+ int saved_errno = errno;
+ const char *nonrelative_template;
+
+ if (!template[0])
+ template = origtemplate;
- /* slow path */
- /* some mkstemp implementations erase template on failure */
- snprintf(template, limit, "%s/%s",
- get_object_directory(), pattern);
- safe_create_leading_directories(template);
- return xmkstemp(template);
+ nonrelative_template = absolute_path(template);
+ errno = saved_errno;
+ die_errno("Unable to create temporary file '%s'",
+ nonrelative_template);
+ }
+ return fd;
}
-int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
+static int warn_if_unremovable(const char *op, const char *file, int rc)
{
- int fd;
+ int err;
+ if (!rc || errno == ENOENT)
+ return 0;
+ err = errno;
+ warning("unable to %s %s: %s", op, file, strerror(errno));
+ errno = err;
+ return rc;
+}
+
+int unlink_or_msg(const char *file, struct strbuf *err)
+{
+ int rc = unlink(file);
- snprintf(name, namesz, "%s/pack/pack-%s.keep",
- get_object_directory(), sha1_to_hex(sha1));
- fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
- if (0 <= fd)
- return fd;
+ assert(err);
- /* slow path */
- safe_create_leading_directories(name);
- return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
+ if (!rc || errno == ENOENT)
+ return 0;
+
+ strbuf_addf(err, "unable to unlink %s: %s",
+ file, strerror(errno));
+ return -1;
}
int unlink_or_warn(const char *file)
{
- int rc = unlink(file);
+ return warn_if_unremovable("unlink", file, unlink(file));
+}
+
+int rmdir_or_warn(const char *file)
+{
+ return warn_if_unremovable("rmdir", file, rmdir(file));
+}
+
+int remove_or_warn(unsigned int mode, const char *file)
+{
+ return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file);
+}
+
+void warn_on_inaccessible(const char *path)
+{
+ warning(_("unable to access '%s': %s"), path, strerror(errno));
+}
+
+static int access_error_is_ok(int err, unsigned flag)
+{
+ return err == ENOENT || err == ENOTDIR ||
+ ((flag & ACCESS_EACCES_OK) && err == EACCES);
+}
+
+int access_or_warn(const char *path, int mode, unsigned flag)
+{
+ int ret = access(path, mode);
+ if (ret && !access_error_is_ok(errno, flag))
+ warn_on_inaccessible(path);
+ return ret;
+}
- if (rc < 0) {
+int access_or_die(const char *path, int mode, unsigned flag)
+{
+ int ret = access(path, mode);
+ if (ret && !access_error_is_ok(errno, flag))
+ die_errno(_("unable to access '%s'"), path);
+ return ret;
+}
+
+struct passwd *xgetpwuid_self(void)
+{
+ struct passwd *pw;
+
+ errno = 0;
+ pw = getpwuid(getuid());
+ if (!pw)
+ die(_("unable to look up current user in the passwd file: %s"),
+ errno ? strerror(errno) : _("no such user"));
+ return pw;
+}
+
+char *xgetcwd(void)
+{
+ struct strbuf sb = STRBUF_INIT;
+ if (strbuf_getcwd(&sb))
+ die_errno(_("unable to get current working directory"));
+ return strbuf_detach(&sb, NULL);
+}
+
+int write_file(const char *path, int fatal, const char *fmt, ...)
+{
+ struct strbuf sb = STRBUF_INIT;
+ va_list params;
+ int fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0666);
+ if (fd < 0) {
+ if (fatal)
+ die_errno(_("could not open %s for writing"), path);
+ return -1;
+ }
+ va_start(params, fmt);
+ strbuf_vaddf(&sb, fmt, params);
+ va_end(params);
+ if (write_in_full(fd, sb.buf, sb.len) != sb.len) {
int err = errno;
- if (ENOENT != err) {
- warning("unable to unlink %s: %s",
- file, strerror(errno));
- errno = err;
- }
+ close(fd);
+ strbuf_release(&sb);
+ errno = err;
+ if (fatal)
+ die_errno(_("could not write to %s"), path);
+ return -1;
}
- return rc;
+ strbuf_release(&sb);
+ if (close(fd)) {
+ if (fatal)
+ die_errno(_("could not close %s"), path);
+ return -1;
+ }
+ return 0;
}
-