1 files changed, 55 insertions, 0 deletions
diff --git a/internal/app/spaccount.go b/internal/app/spaccount.go
new file mode 100644
index 00000000..dbe3b03c
--- /dev/null
+++ b/internal/app/spaccount.go
@@ -0,0 +1,55 @@
+package app
+
+import (
+	"fmt"
+	"syscall"
+
+	"hakurei.app/container"
+	"hakurei.app/hst"
+)
+
+// spAccountOp sets up user account emulation inside the container.
+type spAccountOp struct {
+	// Inner directory to use as the home directory of the emulated user.
+	Home *container.Absolute
+	// String matching the default NAME_REGEX value from adduser to use as the username of the emulated user.
+	Username string
+	// Pathname of shell to use for the emulated user.
+	Shell *container.Absolute
+}
+
+func (s *spAccountOp) toSystem(*outcomeStateSys, *hst.Config) error {
+	const fallbackUsername = "chronos"
+
+	// do checks here to fail before fork/exec
+	if s.Home == nil || s.Shell == nil {
+		// unreachable
+		return syscall.ENOTRECOVERABLE
+	}
+	if s.Username == "" {
+		s.Username = fallbackUsername
+	} else if !isValidUsername(s.Username) {
+		return newWithMessage(fmt.Sprintf("invalid user name %q", s.Username))
+	}
+	return nil
+}
+
+func (s *spAccountOp) toContainer(state *outcomeStateParams) error {
+	state.params.Dir = s.Home
+	state.env["HOME"] = s.Home.String()
+	state.env["USER"] = s.Username
+	state.env["SHELL"] = s.Shell.String()
+
+	state.params.
+		Place(container.AbsFHSEtc.Append("passwd"),
+			[]byte(s.Username+":x:"+
+				state.mapuid.String()+":"+
+				state.mapgid.String()+
+				":Hakurei:"+
+				s.Home.String()+":"+
+				s.Shell.String()+"\n")).
+		Place(container.AbsFHSEtc.Append("group"),
+			[]byte("hakurei:x:"+state.mapgid.String()+":\n"))
+
+	return nil
+}