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Embed _psl_compile_time derived from $SOURCE_DATE_EPOCH if set 

Making packages build byte-for-byte reproducibly from a given
toolchain+source makes it much easier to corroborate builds by testing
against other build infrastructure.

By default, libpsl currently embeds the current unix timestamp in
_psl_compile_time, which makes it bytewise incompatible if it is
rebuild even on the same machine one second later.

See https://wiki.debian.org/ReproducibleBuilds/TimestampsProposal for
more information about $SOURCE_DATE_EPOCH.
This commit is contained in:
Daniel Kahn Gillmor 2015-07-12 16:10:46 -04:00 committed by Tim Rühsen
parent 37858be73f
commit f9a1bdcf80
1 changed files with 5 additions and 1 deletions
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4
src/psl2c.c
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@ -157,6 +157,7 @@ int main(int argc, const char **argv)
struct stat st;
size_t cmdsize = 16 + strlen(argv[1]);
char *cmd = alloca(cmdsize), checksum[64] = "";
const char *source_date_epoch = NULL;
#if 0
/* include library code did not generate punycode, so let's do it for the builtin data */
@ -177,6 +178,9 @@ int main(int argc, const char **argv)
if (stat(argv[1], &st) != 0)
st.st_mtime = 0;
fprintf(fpout, "static time_t _psl_file_time = %lu;\n", st.st_mtime);
if ((source_date_epoch = getenv("SOURCE_DATE_EPOCH")))
fprintf(fpout, "static time_t _psl_compile_time = %lu;\n", atol(source_date_epoch));
else
fprintf(fpout, "static time_t _psl_compile_time = %lu;\n", time(NULL));
fprintf(fpout, "static const char _psl_sha1_checksum[] = \"%s\";\n", checksum);
fprintf(fpout, "static const char _psl_filename[] = \"%s\";\n", argv[1]);