macos - 在 OSX 上更改文件的 "date added"属性

Question

我一直在使用终端更改文件的“添加日期”属性，但没有成功。

我正在做的是:

1. 显示文件的属性:

   mdls 文件名

2. 显示“添加日期”属性:

   xattr -p "kMDItemDateAdded"文件名

3. 改变它:

   sudo xattr -w "kMDItemDateAdded""201111111111.11"文件名

第三条指令不起作用!而触摸具有相同日期值的文件会更改修改日期。

我正在运行优胜美地。来自社区的任何想法？

Answer 1

感谢Ken Thomases above为我指出 setattrlist 的方向；以下代码适用于 macOS Monterey 12.5.1。

#include <stdlib.h>
#include <string.h>
#include <sys/attr.h>
#include <unistd.h>

/*
 * Get kMDItemDateAdded of path.
 *
 * Returns:
 *   • 0 on success
 *   • 1 if a system call failed: check errno
 *   • 2 if something else went wrong
 */
int get_date_added(const char* path, struct timespec * out) {
    attrgroup_t request_attrs = ATTR_CMN_RETURNED_ATTRS | ATTR_CMN_ADDEDTIME;

    struct attrlist request;
    memset(&request, 0, sizeof(request));
    request.bitmapcount = ATTR_BIT_MAP_COUNT;
    request.commonattr = request_attrs;

    typedef struct {
        u_int32_t length;
        attribute_set_t returned;
        struct timespec added;
    } __attribute__((aligned(4), packed)) response_buf_t;

    response_buf_t response;

    int err = getattrlist(path, &request, &response, sizeof(response), 0);
    if (err != 0) {
        return 1;
    }
    if (response.length != sizeof(response)) {
        // Need a different-sized buffer; but provided one of exactly required
        // size?!
        return 2;
    }
    if (response.returned.commonattr != request_attrs) {
        // Didn’t get back all requested common attributes
        return 2;
    }

    out->tv_sec = response.added.tv_sec;
    out->tv_nsec = response.added.tv_nsec;

    return 0;
}

/*
 * Set kMDItemDateAdded of path.
 *
 * Returns:
 *   • 0 on success
 *   • 1 if a system call failed: check errno
 */
int set_date_added(const char* path, struct timespec in) {
    attrgroup_t request_attrs = ATTR_CMN_ADDEDTIME;

    struct attrlist request;
    memset(&request, 0, sizeof(request));
    request.bitmapcount = ATTR_BIT_MAP_COUNT;
    request.commonattr = request_attrs;

    typedef struct {
        struct timespec added;
    } __attribute__((aligned(4), packed)) request_buf_t;

    request_buf_t request_buf;
    request_buf.added.tv_sec = in.tv_sec;
    request_buf.added.tv_nsec = in.tv_nsec;

    int err = setattrlist(path, &request, &request_buf, sizeof(request_buf), 0);
    if (err != 0) {
        return 1;
    }

    return 0;
}