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Allow to override build date with SOURCE_DATE_EPOCH

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in order to make builds reproducible.
See https://reproducible-builds.org/ for why this is good
and https://reproducible-builds.org/specs/source-date-epoch/
for the definition of this variable.

This patch was done while working on reproducible builds for openSUSE.
This commit is contained in:
Bernhard M. Wiedemann 2022-09-25 12:03:46 +02:00
parent 49f4e88cde
commit 56c2d998d9
1 changed files with 10 additions and 0 deletions
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10
tools/genversion.cpp
View file

@ -31,6 +31,7 @@
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <sstream>
/* usage: genversion "/path/to/version-generated.h" "major.minor.path.patch2" */
@ -127,6 +128,15 @@ int main(int argc, char * argv[]) {
fprintf(file, "#define StratagusGitRev %s\n", git_rev);
time_t tt = time(NULL);
char *source_date_epoch = std::getenv("SOURCE_DATE_EPOCH");
if (source_date_epoch) {
std::istringstream iss(source_date_epoch);
iss >> tt;
if (iss.fail() || !iss.eof()) {
fprintf(stderr, "Error: Cannot parse SOURCE_DATE_EPOCH as integer\n");
exit(27);
}
}
struct tm *tm = gmtime(&tt);
fprintf(file, "#define StratagusLastModifiedDate \"%02d/%02d/%02d\"\n", tm->tm_mon + 1, tm->tm_mday, tm->tm_year + 1900);
fprintf(file, "#define StratagusLastModifiedTime \"%02d:%02d:%02d\"\n", tm->tm_hour, tm->tm_min, tm->tm_sec);