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package main
import (
"encoding/json"
"flag"
"log"
"os"
"path"
"git.gensokyo.uk/security/fortify/fst"
"git.gensokyo.uk/security/fortify/internal"
"git.gensokyo.uk/security/fortify/internal/fmsg"
)
func actionInstall(args []string) {
set := flag.NewFlagSet("install", flag.ExitOnError)
var (
dropShellInstall bool
dropShellActivate bool
)
set.BoolVar(&dropShellInstall, "si", false, "Drop to a shell on installation")
set.BoolVar(&dropShellActivate, "sa", false, "Drop to a shell on activation")
// Ignore errors; set is set for ExitOnError.
_ = set.Parse(args)
args = set.Args()
if len(args) != 1 {
log.Fatal("invalid argument")
}
pkgPath := args[0]
if !path.IsAbs(pkgPath) {
if dir, err := os.Getwd(); err != nil {
log.Fatalf("cannot get current directory: %v", err)
} else {
pkgPath = path.Join(dir, pkgPath)
}
}
/*
Look up paths to programs started by fpkg.
This is done here to ease error handling as cleanup is not yet required.
*/
var (
_ = lookPath("zstd")
tar = lookPath("tar")
chmod = lookPath("chmod")
rm = lookPath("rm")
)
/*
Extract package and set up for cleanup.
*/
var workDir string
if p, err := os.MkdirTemp("", "fpkg.*"); err != nil {
log.Fatalf("cannot create temporary directory: %v", err)
} else {
workDir = p
}
cleanup := func() {
// should be faster than a native implementation
mustRun(chmod, "-R", "+w", workDir)
mustRun(rm, "-rf", workDir)
}
beforeRunFail.Store(&cleanup)
mustRun(tar, "-C", workDir, "-xf", pkgPath)
/*
Parse bundle and app metadata, do pre-install checks.
*/
bundle := loadBundleInfo(path.Join(workDir, "bundle.json"), cleanup)
pathSet := pathSetByApp(bundle.ID)
app := bundle
if s, err := os.Stat(pathSet.metaPath); err != nil {
if !os.IsNotExist(err) {
cleanup()
log.Fatalf("cannot access %q: %v", pathSet.metaPath, err)
}
// did not modify app, clean installation condition met later
} else if s.IsDir() {
cleanup()
log.Fatalf("metadata path %q is not a file", pathSet.metaPath)
} else {
app = loadBundleInfo(pathSet.metaPath, cleanup)
if app.ID != bundle.ID {
cleanup()
log.Fatalf("app %q claims to have identifier %q", bundle.ID, app.ID)
}
// sec: should verify credentials
}
if app != bundle {
// do not try to re-install
if app.NixGL == bundle.NixGL &&
app.CurrentSystem == bundle.CurrentSystem &&
app.Launcher == bundle.Launcher &&
app.ActivationPackage == bundle.ActivationPackage {
cleanup()
log.Printf("package %q is identical to local application %q", pkgPath, app.ID)
internal.Exit(0)
}
// AppID determines uid
if app.AppID != bundle.AppID {
cleanup()
log.Fatalf("package %q app id %d differs from installed %d", pkgPath, bundle.AppID, app.AppID)
}
// sec: should compare version string
fmsg.Verbosef("installing application %q version %q over local %q", bundle.ID, bundle.Version, app.Version)
} else {
fmsg.Verbosef("application %q clean installation", bundle.ID)
// sec: should install credentials
}
/*
Setup steps for files owned by the target user.
*/
withCacheDir("install", []string{
// export inner bundle path in the environment
"export BUNDLE=" + fst.Tmp + "/bundle",
// replace inner /etc
"mkdir -p etc",
"chmod -R +w etc",
"rm -rf etc",
"cp -dRf $BUNDLE/etc etc",
// replace inner /nix
"mkdir -p nix",
"chmod -R +w nix",
"rm -rf nix",
"cp -dRf /nix nix",
// copy from binary cache
"nix copy --offline --no-check-sigs --all --from file://$BUNDLE/res --to $PWD",
// deduplicate nix store
"nix store --offline --store $PWD optimise",
// make cache directory world-readable for autoetc
"chmod 0755 .",
}, workDir, bundle, pathSet, dropShellInstall, cleanup)
if bundle.GPU {
withCacheDir("mesa-wrappers", []string{
// link nixGL mesa wrappers
"mkdir -p nix/.nixGL",
"ln -s " + bundle.Mesa + "/bin/nixGLIntel nix/.nixGL/nixGL",
"ln -s " + bundle.Mesa + "/bin/nixVulkanIntel nix/.nixGL/nixVulkan",
}, workDir, bundle, pathSet, false, cleanup)
}
/*
Activate home-manager generation.
*/
withNixDaemon("activate", []string{
// clean up broken links
"mkdir -p .local/state/{nix,home-manager}",
"chmod -R +w .local/state/{nix,home-manager}",
"rm -rf .local/state/{nix,home-manager}",
// run activation script
bundle.ActivationPackage + "/activate",
}, false, func(config *fst.Config) *fst.Config { return config }, bundle, pathSet, dropShellActivate, cleanup)
/*
Installation complete. Write metadata to block re-installs or downgrades.
*/
// serialise metadata to ensure consistency
if f, err := os.OpenFile(pathSet.metaPath+"~", os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644); err != nil {
cleanup()
log.Fatalf("cannot create metadata file: %v", err)
} else if err = json.NewEncoder(f).Encode(bundle); err != nil {
cleanup()
log.Fatalf("cannot write metadata: %v", err)
} else if err = f.Close(); err != nil {
log.Printf("cannot close metadata file: %v", err)
// not fatal
}
if err := os.Rename(pathSet.metaPath+"~", pathSet.metaPath); err != nil {
cleanup()
log.Fatalf("cannot rename metadata file: %v", err)
}
cleanup()
}
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