Source: gmt Version: 5.2.1+dfsg-5 Severity: wishlist Tags: patch upstream User: reproducible-builds@lists.alioth.debian.org Usertags: timestamps X-Debbugs-Cc: reproducible-builds@lists.alioth.debian.org
Dear Maintainer, While working on the `reproducible builds' effort [1], we have noticed that 'gmt' could not be built reproducibly. The attached patch honours the SOURCE_DATE_EPOCH environment variable [2] to get a reproducible build date from the last debian changelog entry. Once applied, gmt can be built reproducibly in our current experimental framework. Regards, Alexis Bienvenüe. [1]: https://wiki.debian.org/ReproducibleBuilds [2]: https://reproducible-builds.org/specs/source-date-epoch/
Description: Honour SOURCE_DATE_EPOCH Honour the SOURCE_DATE_EPOCH environment variable to set the sources last modification date. See https://reproducible-builds.org/specs/source-date-epoch/ Author: Alexis Bienvenüe <p...@passoire.fr> Index: gmt-5.2.1+dfsg/cmake/modules/today.c =================================================================== --- gmt-5.2.1+dfsg.orig/cmake/modules/today.c +++ gmt-5.2.1+dfsg/cmake/modules/today.c @@ -5,18 +5,32 @@ #include <stdio.h> #include <time.h> +#include <stdlib.h> #define BUFSIZE 32 int main () { char today_string[BUFSIZE]; - /* obtain current time as time since epoch */ - time_t clock = time (NULL); - - /* convert time since epoch to calendar time expressed as local time */ - struct tm *p_time = localtime (&clock); + time_t clock; + struct tm *p_time; + /* See https://reproducible-builds.org/specs/source-date-epoch/ */ + char* source_date_epoch = getenv("SOURCE_DATE_EPOCH"); + if(source_date_epoch) { + /* get sources last modification date from environment */ + clock = strtoull(source_date_epoch, NULL, 10); + + /* Use UTC for reproducibility */ + p_time = gmtime (&clock); + } else { + /* obtain current time as time since epoch */ + clock = time (NULL); + + /* convert time since epoch to calendar time expressed as local time */ + p_time = localtime (&clock); + } + /* convert tm object to custom textual representation YYYY;mm;dd;Mmm*/ size_t result = strftime(today_string, BUFSIZE, "%Y;%m;%d;%B", p_time);
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