From: | Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com> |
---|---|
To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
Cc: | David Steele <david(at)pgmasters(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Suraj Kharage <suraj(dot)kharage(at)enterprisedb(dot)com>, tushar <tushar(dot)ahuja(at)enterprisedb(dot)com>, Rajkumar Raghuwanshi <rajkumar(dot)raghuwanshi(at)enterprisedb(dot)com>, Rushabh Lathia <rushabh(dot)lathia(at)gmail(dot)com>, Tels <nospam-pg-abuse(at)bloodgate(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Jeevan Chalke <jeevan(dot)chalke(at)enterprisedb(dot)com>, vignesh C <vignesh21(at)gmail(dot)com> |
Subject: | Re: documenting the backup manifest file format |
Date: | 2020-04-14 20:33:31 |
Message-ID: | 56987330-e3b7-7f4a-8732-0bb474757f40@2ndQuadrant.com |
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Lists: | pgsql-hackers |
On 4/14/20 4:09 PM, Alvaro Herrera wrote:
> On 2020-Apr-14, Andrew Dunstan wrote:
>
>> OK, but I think if we're putting a timestamp string in ISO-8601 format
>> in the manifest it should be in UTC / Zulu time, precisely to avoid
>> these issues. If that's too much trouble then yes an epoch time will
>> probably do.
> The timestamp is always specified and always UTC (except the code calls
> it GMT).
>
> + /*
> + * Convert last modification time to a string and append it to the
> + * manifest. Since it's not clear what time zone to use and since time
> + * zone definitions can change, possibly causing confusion, use GMT
> + * always.
> + */
> + appendStringInfoString(&buf, "\"Last-Modified\": \"");
> + enlargeStringInfo(&buf, 128);
> + buf.len += pg_strftime(&buf.data[buf.len], 128, "%Y-%m-%d %H:%M:%S %Z",
> + pg_gmtime(&mtime));
> + appendStringInfoString(&buf, "\"");
>
> I was merely saying that it's trivial to make this iso-8601 compliant as
>
> buf.len += pg_strftime(&buf.data[buf.len], 128, "%Y-%m-%dT%H:%M:%SZ",
>
> ie. omit the "GMT" string and replace it with a literal Z, and remove
> the space and replace it with a T.
>
+1
cheers
andre
--
Andrew Dunstan https://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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