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Support reproducible builds (#1802)
* Makefile: Ensure we strip out embedded paths To reproduce binaries undeterministic values needs to be removed. By default Go embeds several module paths into the binaries, which prevents people from reproducing said distributed binary. The distributed binary from micro contains the full home path of the current builder of the binary. -trimpath removes these paths from the binary. $ strings micro | grep "/home/zyedidia" | wc -l 868 This also helps other distributions providing reproducible versions of micro down the line. Signed-off-by: Morten Linderud <morten@linderud.pw> * build-date: Ensure build time adheres to SOURCE_DATE_EPOCH Embedding undeterministic values into binaries prevents reproduction of the binaries. The reproducible builds projects defines `SOURCE_DATE_EPOCH` to allow deterministic insertion of build times. This patch ensures `build-date` checks the environment variable before building with the local time. $ SOURCE_DATE_EPOCH=123123 go run tools/build-date.go January 02, 1970 $ go run tools/build-date.go July 31, 2020 $ make build-quick && ./micro --version [...] Compiled on July 31, 2020 $ SOURCE_DATE_EPOCH=123123 make build-quick && ./micro --version [...] Compiled on January 02, 1970 https://reproducible-builds.org/specs/source-date-epoch/ Signed-off-by: Morten Linderud <morten@linderud.pw>
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Makefile
8
Makefile
@ -15,20 +15,20 @@ VSCODE_TESTS_BASE_URL = 'https://raw.githubusercontent.com/microsoft/vscode/e6a4
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# Builds micro after checking dependencies but without updating the runtime
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build:
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go build -ldflags "-s -w $(GOVARS) $(ADDITIONAL_GO_LINKER_FLAGS)" ./cmd/micro
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go build -trimpath -ldflags "-s -w $(GOVARS) $(ADDITIONAL_GO_LINKER_FLAGS)" ./cmd/micro
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build-dbg:
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go build -ldflags "-s -w $(ADDITIONAL_GO_LINKER_FLAGS) $(DEBUGVAR)" ./cmd/micro
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go build -trimpath -ldflags "-s -w $(ADDITIONAL_GO_LINKER_FLAGS) $(DEBUGVAR)" ./cmd/micro
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build-tags: fetch-tags
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go build -ldflags "-s -w $(GOVARS) $(ADDITIONAL_GO_LINKER_FLAGS)" ./cmd/micro
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go build -trimpath -ldflags "-s -w $(GOVARS) $(ADDITIONAL_GO_LINKER_FLAGS)" ./cmd/micro
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# Builds micro after building the runtime and checking dependencies
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build-all: runtime build
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# Builds micro without checking for dependencies
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build-quick:
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go build -ldflags "-s -w $(GOVARS) $(ADDITIONAL_GO_LINKER_FLAGS)" ./cmd/micro
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go build -trimpath -ldflags "-s -w $(GOVARS) $(ADDITIONAL_GO_LINKER_FLAGS)" ./cmd/micro
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# Same as 'build' but installs to $GOBIN afterward
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install:
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@ -2,9 +2,23 @@ package main
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import (
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"fmt"
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"os"
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"strconv"
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"time"
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)
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func main() {
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fmt.Println(time.Now().Local().Format("January 02, 2006"))
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var buildTime time.Time
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epoch := os.Getenv("SOURCE_DATE_EPOCH")
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if epoch != "" {
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i, err := strconv.Atoi(epoch)
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if err != nil {
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fmt.Errorf("SOURCE_DATE_EPOCH is not a valid integer")
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os.Exit(1)
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}
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buildTime = time.Unix(int64(i), 0)
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} else {
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buildTime = time.Now().Local()
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}
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fmt.Println(buildTime.Format("January 02, 2006"))
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}
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