c.RLock()
	defer c.RUnlock()
	return fmt.Errorf("[%s] %w", c.lastErrTime.Format(time.RFC3339), c.lastErr)
}

// computes the exponential backoff duration according to
// https://www.awsarchitectureblog.com/2015/03/backoff.html
func exponentialBackoffWait(r *rand.Rand, unit, maxSleep time.Duration) func(uint) time.Duration {
	if unit > time.Hour {
		// Protect against integer overflow
		panic("unit cannot exceed one hour")
	}

		tag    string
		errStr string
	}{
		{
			time.Date(2017, time.September, 29, 19, 16, 56, 0, utcLoc),
			"RELEASE.2017-09-29T19-16-56Z", "",
		},
		{
			time.Date(2017, time.August, 5, 0, 0, 53, 0, utcLoc),
			"RELEASE.2017-08-05T00-00-53Z", "",
		},
		{
			time.Now().UTC(), "2017-09-29T19:16:56Z",
			"2017-09-29T19:16:56Z is not a valid release tag",
		},
		{
			time.Now().UTC(), "DEVELOPMENT.GOGET",

   * with as many copies of {@code padChar} as are necessary to reach that length. For example,
   *
   * <ul>
   *   <li>{@code padEnd("4.", 5, '0')} returns {@code "4.000"}
   *   <li>{@code padEnd("2010", 3, '!')} returns {@code "2010"}
   * </ul>
   *
   * <p>See {@link java.util.Formatter} for a richer set of formatting capabilities.
   *
   * @param string the string which should appear at the beginning of the result

        checkVersionsOrder("1.0.0", "1.0-1");

        checkVersionsOrder("2.0-1", "2.0.1");
        checkVersionsOrder("2.0.1-klm", "2.0.1-lmn");
        checkVersionsOrder("2.0.1", "2.0.1-xyz");

        checkVersionsOrder("2.0.1", "2.0.1-123");
        checkVersionsOrder("2.0.1-xyz", "2.0.1-123");
    }

    @Test
    void testLeadingZeroes() {
        checkVersionsOrder("0.7", "2");

   * with as many copies of {@code padChar} as are necessary to reach that length. For example,
   *
   * <ul>
   *   <li>{@code padEnd("4.", 5, '0')} returns {@code "4.000"}
   *   <li>{@code padEnd("2010", 3, '!')} returns {@code "2010"}
   * </ul>
   *
   * <p>See {@link java.util.Formatter} for a richer set of formatting capabilities.
   *
   * @param string the string which should appear at the beginning of the result

			header: http.Header{
				xhttp.AmzObjectLockRetainUntilDate: []string{"2017-01-02T15:04:05Z"},
				xhttp.AmzObjectLockMode:            []string{"governance"},
			},
			expectedErr: ErrPastObjectLockRetainDate,
		},
		{
			header: http.Header{
				xhttp.AmzObjectLockMode:            []string{"governance"},
				xhttp.AmzObjectLockRetainUntilDate: []string{"2017-01-02T15:04:05Z"},
			},
			expectedErr: ErrPastObjectLockRetainDate,

	// Renames and schedules for purging all bucket metacache.
	go renameAllBucketMetacache(diskPath)
}

// Following error message is added to fix a regression in release
// RELEASE.2018-03-16T22-52-12Z after migrating v1 to v2 to v3. This
// migration failed to capture '.This' field properly which indicates
// the disk UUID association. Below error message is returned when

// with RFC3339 (in UTC) - e.g. `2017-09-29T19:16:56Z`
func minioVersionToReleaseTime(version string) (releaseTime time.Time, err error) {
	return time.Parse(time.RFC3339, version)
}

// releaseTimeToReleaseTag - converts a time to a string formatted as
// an official MinIO release tag.
//
// An official minio release tag looks like:
// `RELEASE.2017-09-29T19-16-56Z`

                                            <la:option value="50">50</la:option>
                                            <la:option value="100">100</la:option>
                                            <la:option value="200">500</la:option>
                                            <la:option value="1000">1000</la:option>
                                        </la:select>
                                    </div>

        // Within range (next day)
        assertTrue(rule.isTarget(1, 30, 1)); // 1:30 on Sunday (actually Monday morning)
        assertTrue(rule.isTarget(2, 0, 1)); // 2:00 on Sunday (actually Monday morning)

        // Outside range
        assertFalse(rule.isTarget(21, 59, 1)); // 21:59 on Sunday
        assertFalse(rule.isTarget(2, 1, 1)); // 2:01 on Sunday (actually Monday morning)