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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 <asarai@suse.de>
This commit is contained in:
Aleksa Sarai 2018-08-23 19:53:55 +10:00
parent 022fd9b967
commit 2d7091aaeb
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1 changed files with 13 additions and 0 deletions
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13
man/generate.go
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@ -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"}