From 2d7091aaeb3dac6388d81cbb9b6847c75ee4b7b9 Mon Sep 17 00:00:00 2001 From: Aleksa Sarai Date: Thu, 23 Aug 2018 19:53:55 +1000 Subject: [PATCH] man: obey SOURCE_DATE_EPOCH when generating man pages Previously our man pages included the current time each time they were generated. This causes an issue for reproducible builds, since each re-build of a package that includes the man pages will have different times listed in the man pages. To fix this, add support for SOURCE_DATE_EPOCH (which is a standardised packaging environment variable, designed to be used specifically for this purpose[1]). spf13/cobra doesn't support this natively yet (though I will push a patch for that as well), but it's simpler to fix it directly in docker/cli. [1]: https://reproducible-builds.org/specs/source-date-epoch/ Signed-off-by: Aleksa Sarai --- man/generate.go | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/man/generate.go b/man/generate.go index 4197558a22..4a3e98fb22 100644 --- a/man/generate.go +++ b/man/generate.go @@ -6,6 +6,8 @@ import ( "log" "os" "path/filepath" + "strconv" + "time" "github.com/docker/cli/cli/command" "github.com/docker/cli/cli/command/commands" @@ -24,6 +26,17 @@ func generateManPages(opts *options) error { Source: "Docker Community", } + // If SOURCE_DATE_EPOCH is set, in order to allow reproducible package + // builds, we explicitly set the build time to SOURCE_DATE_EPOCH. + if epoch := os.Getenv("SOURCE_DATE_EPOCH"); epoch != "" { + unixEpoch, err := strconv.ParseInt(epoch, 10, 64) + if err != nil { + return fmt.Errorf("invalid SOURCE_DATE_EPOCH: %v", err) + } + now := time.Unix(unixEpoch, 0) + header.Date = &now + } + stdin, stdout, stderr := term.StdStreams() dockerCli := command.NewDockerCli(stdin, stdout, stderr, false) cmd := &cobra.Command{Use: "docker"}