cmd/fpkg: expose nixGL wrappers

Signed-off-by: Ophestra <cat@gensokyo.uk>

1 files changed, 98 insertions, 0 deletions

diff --git a/cmd/fpkg/with.go b/cmd/fpkg/with.go
new file mode 100644
index 00000000..e4bb7299
--- /dev/null
+++ b/cmd/fpkg/with.go
@@ -0,0 +1,98 @@
+package main
+
+import (
+	"path"
+	"strings"
+
+	"git.gensokyo.uk/security/fortify/fst"
+	"git.gensokyo.uk/security/fortify/internal/fmsg"
+)
+
+func withNixDaemon(
+	action string, command []string, net bool, updateConfig func(config *fst.Config) *fst.Config,
+	app *bundleInfo, pathSet *appPathSet, dropShell bool, beforeFail func(),
+) {
+	fortifyAppDropShell(updateConfig(&fst.Config{
+		ID: app.ID,
+		Command: []string{shell, "-lc", "rm -f /nix/var/nix/daemon-socket/socket && " +
+			// start nix-daemon
+			"nix-daemon --store / & " +
+			// wait for socket to appear
+			"(while [ ! -S /nix/var/nix/daemon-socket/socket ]; do sleep 0.01; done) && " +
+			// create directory so nix stops complaining
+			"mkdir -p /nix/var/nix/profiles/per-user/root/channels && " +
+			strings.Join(command, " && ") +
+			// terminate nix-daemon
+			" && pkill nix-daemon",
+		},
+		Confinement: fst.ConfinementConfig{
+			AppID:    app.AppID,
+			Username: "fortify",
+			Inner:    path.Join("/data/data", app.ID),
+			Outer:    pathSet.homeDir,
+			Sandbox: &fst.SandboxConfig{
+				Hostname:     formatHostname(app.Name) + "-" + action,
+				UserNS:       true, // nix sandbox requires userns
+				Net:          net,
+				NoNewSession: dropShell,
+				Filesystem: []*fst.FilesystemConfig{
+					{Src: pathSet.nixPath, Dst: "/nix", Write: true, Must: true},
+				},
+				Link: [][2]string{
+					{app.CurrentSystem, "/run/current-system"},
+					{"/run/current-system/sw/bin", "/bin"},
+					{"/run/current-system/sw/bin", "/usr/bin"},
+				},
+				Etc:     path.Join(pathSet.cacheDir, "etc"),
+				AutoEtc: true,
+			},
+			ExtraPerms: []*fst.ExtraPermConfig{
+				{Path: dataHome, Execute: true},
+				{Ensure: true, Path: pathSet.baseDir, Read: true, Write: true, Execute: true},
+			},
+		},
+	}), dropShell, beforeFail)
+}
+
+func withCacheDir(action string, command []string, workDir string, app *bundleInfo, pathSet *appPathSet, dropShell bool, beforeFail func()) {
+	fortifyAppDropShell(&fst.Config{
+		ID:      app.ID,
+		Command: []string{shell, "-lc", strings.Join(command, " && ")},
+		Confinement: fst.ConfinementConfig{
+			AppID:    app.AppID,
+			Username: "nixos",
+			Inner:    path.Join("/data/data", app.ID, "cache"),
+			Outer:    pathSet.cacheDir, // this also ensures cacheDir via fshim
+			Sandbox: &fst.SandboxConfig{
+				Hostname:     formatHostname(app.Name) + "-" + action,
+				NoNewSession: dropShell,
+				Filesystem: []*fst.FilesystemConfig{
+					{Src: path.Join(workDir, "nix"), Dst: "/nix", Must: true},
+					{Src: workDir, Dst: path.Join(fst.Tmp, "bundle"), Must: true},
+				},
+				Link: [][2]string{
+					{app.CurrentSystem, "/run/current-system"},
+					{"/run/current-system/sw/bin", "/bin"},
+					{"/run/current-system/sw/bin", "/usr/bin"},
+				},
+				Etc:     path.Join(workDir, "etc"),
+				AutoEtc: true,
+			},
+			ExtraPerms: []*fst.ExtraPermConfig{
+				{Path: dataHome, Execute: true},
+				{Ensure: true, Path: pathSet.baseDir, Read: true, Write: true, Execute: true},
+				{Path: workDir, Execute: true},
+			},
+		},
+	}, dropShell, beforeFail)
+}
+
+func fortifyAppDropShell(config *fst.Config, dropShell bool, beforeFail func()) {
+	if dropShell {
+		config.Command = []string{shell, "-l"}
+		fortifyApp(config, beforeFail)
+		beforeFail()
+		fmsg.Exit(0)
+	}
+	fortifyApp(config, beforeFail)
+}