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deb: Add prepend/append for paths instead of replacing full $PATH
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This makes the build a bit more friendly to building outside of DALEC
where we don't mess with *their* $PATH except by adding the paths we
need instead of replacing the whole thing.

Signed-off-by: Brian Goff <[email protected]>
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@cpuguy83
cpuguy83 committed Nov 26, 2024
1 parent df30a8a commit d5b0051
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Showing 4 changed files with 135 additions and 72 deletions.
70 changes: 48 additions & 22 deletions frontend/deb/debroot.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,25 @@ func sourcePatchesDir(sOpt dalec.SourceOpts, base llb.State, dir, name string, s
return append(states, series), nil
}

type SourcePkgConfig struct {
// PrependPath is a list of paths to be prepended to the $PATH var in build
// scripts.
PrependPath []string
// APpendPath is a list of paths to be appended to the $PATH var in build
// scripts.
AppendPath []string
}

// Addpath creates a SourcePkgConfig where the first argument is sets
// [SourcePkgConfig.PrependPath] and the 2nd argument sets
// [SourcePkgConfig.AppendPath]
func AddPath(pre, post []string) SourcePkgConfig {
return SourcePkgConfig{
PrependPath: pre,
AppendPath: post,
}
}

// Debroot creates a debian root directory suitable for use with debbuild.
// This does not include sources in case you want to mount sources (instead of copying them) later.
//
Expand All @@ -75,7 +94,7 @@ func sourcePatchesDir(sOpt dalec.SourceOpts, base llb.State, dir, name string, s
// an upgrade even if it is technically the same underlying source.
// It may be left blank but is highly recommended to set this.
// Use [ReadDistroVersionID] to get a suitable value.
func Debroot(ctx context.Context, sOpt dalec.SourceOpts, spec *dalec.Spec, worker, in llb.State, target, dir, distroVersionID string, opts ...llb.ConstraintsOpt) (llb.State, error) {
func Debroot(ctx context.Context, sOpt dalec.SourceOpts, spec *dalec.Spec, worker, in llb.State, target, dir, distroVersionID string, cfg SourcePkgConfig, opts ...llb.ConstraintsOpt) (llb.State, error) {
control, err := controlFile(spec, in, target, dir)
if err != nil {
return llb.Scratch(), errors.Wrap(err, "error generating control file")
Expand Down Expand Up @@ -122,15 +141,10 @@ func Debroot(ctx context.Context, sOpt dalec.SourceOpts, spec *dalec.Spec, worke
dalecDir := base.
File(llb.Mkdir(filepath.Join(dir, "dalec"), 0o755), opts...)

pathVar, _, err := worker.GetEnv(ctx, "PATH", opts...)
if err != nil {
return in, fmt.Errorf("error looking up $PATH in worker image: %w", err)
}

states = append(states, dalecDir.File(llb.Mkfile(filepath.Join(dir, "dalec/build.sh"), 0o700, createBuildScript(spec, pathVar)), opts...))
states = append(states, dalecDir.File(llb.Mkfile(filepath.Join(dir, "dalec/patch.sh"), 0o700, createPatchScript(spec, pathVar)), opts...))
states = append(states, dalecDir.File(llb.Mkfile(filepath.Join(dir, "dalec/fix_sources.sh"), 0o700, fixupSources(spec, pathVar)), opts...))
states = append(states, dalecDir.File(llb.Mkfile(filepath.Join(dir, "dalec/fix_perms.sh"), 0o700, fixupArtifactPerms(spec, pathVar)), opts...))
states = append(states, dalecDir.File(llb.Mkfile(filepath.Join(dir, "dalec/build.sh"), 0o700, createBuildScript(spec, &cfg)), opts...))
states = append(states, dalecDir.File(llb.Mkfile(filepath.Join(dir, "dalec/patch.sh"), 0o700, createPatchScript(spec, &cfg)), opts...))
states = append(states, dalecDir.File(llb.Mkfile(filepath.Join(dir, "dalec/fix_sources.sh"), 0o700, fixupSources(spec, &cfg)), opts...))
states = append(states, dalecDir.File(llb.Mkfile(filepath.Join(dir, "dalec/fix_perms.sh"), 0o700, fixupArtifactPerms(spec, &cfg)), opts...))

customEnable, err := customDHInstallSystemdPostinst(spec)
if err != nil {
Expand Down Expand Up @@ -166,9 +180,9 @@ func Debroot(ctx context.Context, sOpt dalec.SourceOpts, spec *dalec.Spec, worke
return dalec.MergeAtPath(in, states, "/"), nil
}

func fixupArtifactPerms(spec *dalec.Spec, pathVar string) []byte {
func fixupArtifactPerms(spec *dalec.Spec, cfg *SourcePkgConfig) []byte {
buf := bytes.NewBuffer(nil)
writeScriptHeader(buf, pathVar)
writeScriptHeader(buf, cfg)

basePath := filepath.Join("debian", spec.Name)

Expand Down Expand Up @@ -203,9 +217,9 @@ func fixupArtifactPerms(spec *dalec.Spec, pathVar string) []byte {
// to bring those back.
//
// This is called from `debian/rules` after the source tarball has been extracted.
func fixupSources(spec *dalec.Spec, pathVar string) []byte {
func fixupSources(spec *dalec.Spec, cfg *SourcePkgConfig) []byte {
buf := bytes.NewBuffer(nil)
writeScriptHeader(buf, pathVar)
writeScriptHeader(buf, cfg)

// now, we need to find all the sources that are file-backed and fix them up
for name, src := range spec.Sources {
Expand All @@ -229,29 +243,41 @@ func fixupSources(spec *dalec.Spec, pathVar string) []byte {
// Older go versions did not have support for the `GOMODCACHE` var
// This is a hack to try and make the build work by linking the go modules
// we've already fetched into to module dir under $GOPATH
fmt.Fprintf(buf, `test -n "$(go env GOMODCACHE)" || (GOPATH="$(go env GOPATH)"; mkdir -p "${GOPATH}/pkg" && ln -s "$(pwd)/%s" "${GOPATH}/pkg/mod")`, gomodsName)
fmt.Fprintf(buf, `env | grep PATH; test -n "$(go env GOMODCACHE)" || (GOPATH="$(go env GOPATH)"; mkdir -p "${GOPATH}/pkg" && ln -s "$(pwd)/%s" "${GOPATH}/pkg/mod")`, gomodsName)
// Above command does not have a newline due to quoting issues, so add that here.
fmt.Fprint(buf, "\n")
}

return buf.Bytes()
}

func writeScriptHeader(buf io.Writer, pathVar string) {
func setupPathVar(pre, post []string) string {
if len(pre) == 0 && len(post) == 0 {
return ""
}

full := append(pre, "$PATH")
full = append(full, post...)
return strings.Join(full, ":")
}

func writeScriptHeader(buf io.Writer, cfg *SourcePkgConfig) {
fmt.Fprintln(buf, "#!/usr/bin/env sh")
fmt.Fprintln(buf)

fmt.Fprintln(buf, "set -ex")

if pathVar != "" {
fmt.Fprintln(buf, `export PATH="`+pathVar+`"`)
if cfg != nil {
if pathVar := setupPathVar(cfg.PrependPath, cfg.AppendPath); pathVar != "" {
fmt.Fprintln(buf, "export PATH="+pathVar)
}
}
}

func createPatchScript(spec *dalec.Spec, pathVar string) []byte {
func createPatchScript(spec *dalec.Spec, cfg *SourcePkgConfig) []byte {
buf := bytes.NewBuffer(nil)

writeScriptHeader(buf, pathVar)
writeScriptHeader(buf, cfg)

for name, patches := range spec.Patches {
for _, patch := range patches {
Expand All @@ -263,9 +289,9 @@ func createPatchScript(spec *dalec.Spec, pathVar string) []byte {
return buf.Bytes()
}

func createBuildScript(spec *dalec.Spec, pathVar string) []byte {
func createBuildScript(spec *dalec.Spec, cfg *SourcePkgConfig) []byte {
buf := bytes.NewBuffer(nil)
writeScriptHeader(buf, pathVar)
writeScriptHeader(buf, cfg)

sorted := dalec.SortMapKeys(spec.Build.Env)
for _, k := range sorted {
Expand Down
2 changes: 1 addition & 1 deletion frontend/deb/distro/install.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -134,7 +134,7 @@ func (d *Config) InstallBuildDeps(sOpt dalec.SourceOpts, spec *dalec.Spec, targe
opts := append(opts, dalec.ProgressGroup("Install build dependencies"))
opts = append([]llb.ConstraintsOpt{dalec.WithConstraint(c)}, opts...)

srcPkg, err := deb.SourcePackage(ctx, sOpt, in, depsSpec, targetKey, "", opts...)
srcPkg, err := deb.SourcePackage(ctx, sOpt, in, depsSpec, targetKey, "", deb.SourcePkgConfig{}, opts...)
if err != nil {
return in, err
}
Expand Down
131 changes: 84 additions & 47 deletions frontend/deb/distro/pkg.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,14 @@ func (d *Config) BuildDeb(ctx context.Context, worker llb.State, sOpt dalec.Sour
}

worker = worker.With(d.InstallBuildDeps(sOpt, spec, targetKey))
srcPkg, err := deb.SourcePackage(ctx, sOpt, worker.With(ensureGolang(client, spec, targetKey, opts...)), spec, targetKey, versionID, opts...)

var cfg deb.SourcePkgConfig
extraPaths, err := prepareGo(ctx, client, &cfg, worker, spec, targetKey, opts...)
if err != nil {
return worker, err
}

srcPkg, err := deb.SourcePackage(ctx, sOpt, worker.With(extraPaths), spec, targetKey, versionID, cfg, opts...)
if err != nil {
return worker, err
}
Expand All @@ -44,60 +51,83 @@ func (d *Config) BuildDeb(ctx context.Context, worker llb.State, sOpt dalec.Sour
return frontend.MaybeSign(ctx, client, st, spec, targetKey, sOpt)
}

// ensureGolang is a work-around for the case where the base distro golang package
// is too old, but other packages are provided (e.g. `golang-1.22`) and those
// other packages don't actually add go tools to $PATH.
// It assumes if you added one of these go packages and there is no `go` in $PATH
// that you probably wanted to use that version of go.
func ensureGolang(client gwclient.Client, spec *dalec.Spec, targetKey string, opts ...llb.ConstraintsOpt) llb.StateOption {
return func(in llb.State) llb.State {
deps := spec.GetBuildDeps(targetKey)
if _, hasNormalGo := deps["golang"]; hasNormalGo {
return in
func noOpStateOpt(in llb.State) llb.State {
return in
}

func prepareGo(ctx context.Context, client gwclient.Client, cfg *deb.SourcePkgConfig, worker llb.State, spec *dalec.Spec, targetKey string, opts ...llb.ConstraintsOpt) (llb.StateOption, error) {
goBin, err := searchForAltGolang(ctx, client, spec, targetKey, worker, opts...)
if err != nil {
return noOpStateOpt, errors.Wrap(err, "error while looking for alternate go bin path")
}

if goBin == "" {
return noOpStateOpt, nil
}
cfg.PrependPath = append(cfg.PrependPath, goBin)
return addPaths([]string{goBin}, opts...), nil
}

func searchForAltGolang(ctx context.Context, client gwclient.Client, spec *dalec.Spec, targetKey string, in llb.State, opts ...llb.ConstraintsOpt) (string, error) {
if !spec.HasGomods() {
return "", nil
}
var candidates []string

deps := spec.GetBuildDeps(targetKey)
if _, hasNormalGo := deps["golang"]; hasNormalGo {
return "", nil
}

for dep := range deps {
if strings.HasPrefix(dep, "golang-") {
// Get the base version component
_, ver, _ := strings.Cut(dep, "-")
// Trim off any potential extra stuff like `golang-1.20-go` (ie the `-go` bit)
// This is just for having definitive search paths to check it should
// not be an issue if this is not like the above example and its
// something else like `-doc` since we are still going to check the
// binary exists anyway (plus this would be highly unlikely in any case).
ver, _, _ = strings.Cut(ver, "-")
candidates = append(candidates, "usr/lib/go-"+ver+"/bin")
}
}

return in.Async(func(ctx context.Context, in llb.State, c *llb.Constraints) (llb.State, error) {
var candidates []string
for dep := range deps {
if strings.HasPrefix(dep, "golang-") {
// Get the base version component
_, ver, _ := strings.Cut(dep, "-")
// Trim off any potential extra stuff like `golang-1.20-go` (ie the `-go` bit)
// This is just for having definitive search paths to check it should
// not be an issue if this is not like the above example and its
// something else like `-doc` since we are still going to check the
// binary exists anyway (plus this would be highly unlikely in any case).
ver, _, _ = strings.Cut(ver, "-")
candidates = append(candidates, "usr/lib/go-"+ver+"/bin")
}
}
if len(candidates) == 0 {
return "", nil
}

if len(candidates) == 0 {
return in, nil
}
stfs, err := bkfs.FromState(ctx, &in, client, opts...)
if err != nil {
return "", err
}

opts := []llb.ConstraintsOpt{dalec.WithConstraint(c), dalec.WithConstraints(opts...)}
for _, p := range candidates {
_, err := fs.Stat(stfs, filepath.Join(p, "go"))
if err == nil {
// bkfs does not allow a leading `/` in the stat path per spec for [fs.FS]
// Add that in here
p := "/" + p
return p, nil
}
}

pathVar, _, err := in.GetEnv(ctx, "PATH", opts...)
if err != nil {
return in, err
}
return "", nil
}

stfs, err := bkfs.FromState(ctx, &in, client, opts...)
// prepends the provided values to $PATH
func addPaths(paths []string, opts ...llb.ConstraintsOpt) llb.StateOption {
return func(in llb.State) llb.State {
if len(paths) == 0 {
return in
}
return in.Async(func(ctx context.Context, in llb.State, c *llb.Constraints) (llb.State, error) {
opts := []llb.ConstraintsOpt{dalec.WithConstraint(c), dalec.WithConstraints(opts...)}
pathEnv, _, err := in.GetEnv(ctx, "PATH", opts...)
if err != nil {
return in, err
}

for _, p := range candidates {
_, err := fs.Stat(stfs, filepath.Join(p, "go"))
if err == nil {
// bkfs does not allow a leading `/` in the stat path per spec for [fs.FS]
// Add that in here
p := "/" + p
return in.AddEnv("PATH", p+":"+pathVar), nil
}
}
return in, nil
return in.AddEnv("PATH", strings.Join(append(paths, pathEnv), ":")), nil
})
}
}
Expand Down Expand Up @@ -203,7 +233,14 @@ func (cfg *Config) HandleSourcePkg(ctx context.Context, client gwclient.Client)
}

worker = worker.With(cfg.InstallBuildDeps(sOpt, spec, targetKey, pg))
st, err := deb.SourcePackage(ctx, sOpt, worker.With(ensureGolang(client, spec, targetKey, pg)), spec, targetKey, versionID, pg)

var cfg deb.SourcePkgConfig
extraPaths, err := prepareGo(ctx, client, &cfg, worker, spec, targetKey, pg)
if err != nil {
return nil, nil, err
}

st, err := deb.SourcePackage(ctx, sOpt, worker.With(extraPaths), spec, targetKey, versionID, cfg, pg)
if err != nil {
return nil, nil, errors.Wrap(err, "error building source package")
}
Expand Down
4 changes: 2 additions & 2 deletions frontend/deb/pkg.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -71,11 +71,11 @@ func createPatches(spec *dalec.Spec, sources map[string]llb.State, worker llb.St
return patches
}

func SourcePackage(ctx context.Context, sOpt dalec.SourceOpts, worker llb.State, spec *dalec.Spec, targetKey, distroVersionID string, opts ...llb.ConstraintsOpt) (llb.State, error) {
func SourcePackage(ctx context.Context, sOpt dalec.SourceOpts, worker llb.State, spec *dalec.Spec, targetKey, distroVersionID string, cfg SourcePkgConfig, opts ...llb.ConstraintsOpt) (llb.State, error) {
if err := validateSpec(spec); err != nil {
return llb.Scratch(), err
}
dr, err := Debroot(ctx, sOpt, spec, worker, llb.Scratch(), targetKey, "", distroVersionID)
dr, err := Debroot(ctx, sOpt, spec, worker, llb.Scratch(), targetKey, "", distroVersionID, cfg, opts...)
if err != nil {
return llb.Scratch(), err
}
Expand Down

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