Make error message after failing commit_lock_file() less confusing

diff --git a/wrapper.c b/wrapper.c
index ff49807948f3c406fe73511cec4ef4e2b2df186a..0e22d4381438b2c262e1cd5ee0cc4effc2fb3c3d 100644 (file)
--- a/wrapper.c
+++ b/wrapper.c
@@ -189,6 +189,41 @@ void *xcalloc(size_t nmemb, size_t size)
 # endif
 #endif
 
+/**
+ * xopen() is the same as open(), but it die()s if the open() fails.
+ */
+int xopen(const char *path, int oflag, ...)
+{
+       mode_t mode = 0;
+       va_list ap;
+
+       /*
+        * va_arg() will have undefined behavior if the specified type is not
+        * compatible with the argument type. Since integers are promoted to
+        * ints, we fetch the next argument as an int, and then cast it to a
+        * mode_t to avoid undefined behavior.
+        */
+       va_start(ap, oflag);
+       if (oflag & O_CREAT)
+               mode = va_arg(ap, int);
+       va_end(ap);
+
+       for (;;) {
+               int fd = open(path, oflag, mode);
+               if (fd >= 0)
+                       return fd;
+               if (errno == EINTR)
+                       continue;
+
+               if ((oflag & O_RDWR) == O_RDWR)
+                       die_errno(_("could not open '%s' for reading and writing"), path);
+               else if ((oflag & O_WRONLY) == O_WRONLY)
+                       die_errno(_("could not open '%s' for writing"), path);
+               else
+                       die_errno(_("could not open '%s' for reading"), path);
+       }
+}
+
 /*
  * xread() is the same a read(), but it automatically restarts read()
  * operations with a recoverable error (EAGAIN and EINTR). xread()
@@ -311,6 +346,27 @@ int xdup(int fd)
        return ret;
 }
 
+/**
+ * xfopen() is the same as fopen(), but it die()s if the fopen() fails.
+ */
+FILE *xfopen(const char *path, const char *mode)
+{
+       for (;;) {
+               FILE *fp = fopen(path, mode);
+               if (fp)
+                       return fp;
+               if (errno == EINTR)
+                       continue;
+
+               if (*mode && mode[1] == '+')
+                       die_errno(_("could not open '%s' for reading and writing"), path);
+               else if (*mode == 'w' || *mode == 'a')
+                       die_errno(_("could not open '%s' for writing"), path);
+               else
+                       die_errno(_("could not open '%s' for reading"), path);
+       }
+}
+
 FILE *xfdopen(int fd, const char *mode)
 {
        FILE *stream = fdopen(fd, mode);
@@ -565,19 +621,18 @@ char *xgetcwd(void)
        return strbuf_detach(&sb, NULL);
 }
 
-int write_file(const char *path, int fatal, const char *fmt, ...)
+static int write_file_v(const char *path, int fatal,
+                       const char *fmt, va_list params)
 {
        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);
+       strbuf_complete_line(&sb);
        if (write_in_full(fd, sb.buf, sb.len) != sb.len) {
                int err = errno;
                close(fd);
@@ -596,6 +651,28 @@ int write_file(const char *path, int fatal, const char *fmt, ...)
        return 0;
 }
 
+int write_file(const char *path, const char *fmt, ...)
+{
+       int status;
+       va_list params;
+
+       va_start(params, fmt);
+       status = write_file_v(path, 1, fmt, params);
+       va_end(params);
+       return status;
+}
+
+int write_file_gently(const char *path, const char *fmt, ...)
+{
+       int status;
+       va_list params;
+
+       va_start(params, fmt);
+       status = write_file_v(path, 0, fmt, params);
+       va_end(params);
+       return status;
+}
+
 void sleep_millisec(int millisec)
 {
        poll(NULL, 0, millisec);