Introduce p_utimes and p_futimes

Provide functionality to set the time on a filesystem entry,
using utimes or futimes on POSIX type systems or SetFileTime
on Win32.

6 files changed, 110 insertions, 6 deletions

diff --git a/src/unix/posix.h b/src/unix/posix.h
index 35bd431b8..425e6bb1b 100644
--- a/src/unix/posix.h
+++ b/src/unix/posix.h
@@ -19,6 +19,9 @@ typedef int GIT_SOCKET;
 #define p_lstat(p,b) lstat(p,b)
 #define p_stat(p,b) stat(p, b)
 
+#define p_utimes(f, t) utimes(f, t)
+#define p_futimes(f, t) futimes(f, t)
+
 #define p_readlink(a, b, c) readlink(a, b, c)
 #define p_symlink(o,n) symlink(o, n)
 #define p_link(o,n) link(o, n)
@@ -26,7 +29,6 @@ typedef int GIT_SOCKET;
 #define p_mkdir(p,m) mkdir(p, m)
 #define p_fsync(fd) fsync(fd)
 extern char *p_realpath(const char *, char *);
-#define p_utimensat(fd, path, times, flags) utimensat(fd, path, times, flags)
 
 #define p_recv(s,b,l,f) recv(s,b,l,f)
 #define p_send(s,b,l,f) send(s,b,l,f)
diff --git a/src/win32/posix.h b/src/win32/posix.h
index bf35c8125..ac98fd864 100644
--- a/src/win32/posix.h
+++ b/src/win32/posix.h
@@ -20,6 +20,9 @@ typedef SOCKET GIT_SOCKET;
 extern int p_lstat(const char *file_name, struct stat *buf);
 extern int p_stat(const char* path, struct stat* buf);
 
+extern int p_utimes(const char *filename, const struct timeval times[2]);
+extern int p_futimes(int fd, const struct timeval times[2]);
+
 extern int p_readlink(const char *path, char *buf, size_t bufsiz);
 extern int p_symlink(const char *old, const char *new);
 extern int p_link(const char *old, const char *new);
diff --git a/src/win32/posix_w32.c b/src/win32/posix_w32.c
index 332ea233c..504562b0e 100644
--- a/src/win32/posix_w32.c
+++ b/src/win32/posix_w32.c
@@ -201,6 +201,44 @@ int p_lstat_posixly(const char *filename, struct stat *buf)
 	return do_lstat(filename, buf, true);
 }
 
+int p_utimes(const char *filename, const struct timeval times[2])
+{
+	int fd, error;
+
+	if ((fd = p_open(filename, O_RDWR)) < 0)
+		return fd;
+
+	error = p_futimes(fd, times);
+
+	close(fd);
+	return error;
+}
+
+int p_futimes(int fd, const struct timeval times[2])
+{
+	HANDLE handle;
+	FILETIME atime = {0}, mtime = {0};
+
+	if (times == NULL) {
+		SYSTEMTIME st;
+
+		GetSystemTime(&st);
+		SystemTimeToFileTime(&st, &atime);
+		SystemTimeToFileTime(&st, &mtime);
+	} else {
+		git_win32__timeval_to_filetime(&atime, times[0]);
+		git_win32__timeval_to_filetime(&mtime, times[1]);
+	}
+
+	if ((handle = (HANDLE)_get_osfhandle(fd)) == INVALID_HANDLE_VALUE)
+		return -1;
+
+	if (SetFileTime(handle, NULL, &atime, &mtime) == 0)
+		return -1;
+
+	return 0;
+}
+
 int p_readlink(const char *path, char *buf, size_t bufsiz)
 {
 	git_win32_path path_w, target_w;
diff --git a/src/win32/w32_util.h b/src/win32/w32_util.h
index 8cb0f5b94..377d651a8 100644
--- a/src/win32/w32_util.h
+++ b/src/win32/w32_util.h
@@ -79,6 +79,16 @@ GIT_INLINE(time_t) git_win32__filetime_to_time_t(const FILETIME *ft)
 	return (time_t)winTime;
 }
 
+GIT_INLINE(void) git_win32__timeval_to_filetime(
+	FILETIME *ft, const struct timeval tv)
+{
+	long long ticks = (tv.tv_sec * 10000000LL) +
+		(tv.tv_usec * 10LL) + 116444736000000000LL;
+
+	ft->dwHighDateTime = ((ticks >> 32) & 0xffffffffLL);
+	ft->dwLowDateTime = (ticks & 0xffffffffLL);
+}
+
 GIT_INLINE(int) git_win32__file_attribute_to_stat(
 	struct stat *st,
 	const WIN32_FILE_ATTRIBUTE_DATA *attrdata,
diff --git a/tests/checkout/checkout_helpers.c b/tests/checkout/checkout_helpers.c
index c2e65b885..f6e36d39b 100644
--- a/tests/checkout/checkout_helpers.c
+++ b/tests/checkout/checkout_helpers.c
@@ -132,8 +132,9 @@ int checkout_count_callback(
 
 void tick_index(git_index *index)
 {
+	int index_fd;
 	git_time_t ts;
-	struct timespec times[2];
+	struct timeval times[2];
 
 	cl_assert(index->on_disk);
 	cl_assert(git_index_path(index));
@@ -141,10 +142,11 @@ void tick_index(git_index *index)
 	cl_git_pass(git_index_read(index, true));
 	ts = index->stamp.mtime;
 
-	times[0].tv_sec  = UTIME_OMIT; /* dont' change the atime */
-	times[0].tv_nsec = UTIME_OMIT; /* dont' change the atime */
+	times[0].tv_sec  = ts;
+	times[0].tv_usec = 0;
 	times[1].tv_sec  = ts + 1;
-	times[1].tv_nsec = 0;
-	cl_git_pass(p_utimensat(AT_FDCWD, git_index_path(index), times, 0));
+	times[1].tv_usec = 0;
+
+	cl_git_pass(p_utimes(git_index_path(index), times));
 	cl_git_pass(git_index_read(index, true));
 }
diff --git a/tests/core/posix.c b/tests/core/posix.c
index 1cef937cd..5a9e24899 100644
--- a/tests/core/posix.c
+++ b/tests/core/posix.c
@@ -97,3 +97,52 @@ void test_core_posix__inet_pton(void)
 	cl_git_fail(p_inet_pton(5, "315.124", NULL)); /* AF_CHAOS */
 	cl_assert_equal_i(EAFNOSUPPORT, errno);
 }
+
+void test_core_posix__utimes(void)
+{
+	struct timeval times[2];
+	struct stat st;
+	time_t curtime;
+	int fd;
+
+	/* test p_utimes */
+	times[0].tv_sec = 1234567890;
+	times[0].tv_usec = 0;
+	times[1].tv_sec = 1234567890;
+	times[1].tv_usec = 0;
+
+	cl_git_mkfile("foo", "Dummy file.");
+	cl_must_pass(p_utimes("foo", times));
+
+	p_stat("foo", &st);
+	cl_assert_equal_i(1234567890, st.st_atime);
+	cl_assert_equal_i(1234567890, st.st_mtime);
+
+
+	/* test p_futimes */
+	times[0].tv_sec = 1414141414;
+	times[0].tv_usec = 0;
+	times[1].tv_sec = 1414141414;
+	times[1].tv_usec = 0;
+
+	cl_must_pass(fd = p_open("foo", O_RDWR));
+	cl_must_pass(p_futimes(fd, times));
+	p_close(fd);
+
+	p_stat("foo", &st);
+	cl_assert_equal_i(1414141414, st.st_atime);
+	cl_assert_equal_i(1414141414, st.st_mtime);
+
+
+	/* test p_utimes with current time, assume that
+	 * it takes < 5 seconds to get the time...!
+	 */
+	cl_must_pass(p_utimes("foo", NULL));
+
+	curtime = time(NULL);
+	p_stat("foo", &st);
+	cl_assert((st.st_atime - curtime) < 5);
+	cl_assert((st.st_mtime - curtime) < 5);
+
+	p_unlink("foo");
+}