added users (spsf untangled by astronand)

Src/Hyperion-bash/bin/passwd

@@ -0,0 +1,80 @@
+--:Minify:--
+-- passwd: change a user's password
+-- Usage: passwd [username]   (default: current user)
+
+local args = {...}
+local targetName = args[1]
+
+local currentUid = syscall.getuid()
+
+local targetUid
+if targetName then
+    targetUid = syscall.auth_getuid(targetName)
+    if not targetUid then
+        print("passwd: user '" .. targetName .. "' does not exist")
+        syscall.exit(1); return
+    end
+    -- Only root can change another user's password
+    if currentUid ~= 0 and targetUid ~= currentUid then
+        print("passwd: permission denied")
+        syscall.exit(1); return
+    end
+else
+    targetUid = currentUid
+    targetName = syscall.getUsername(currentUid) or tostring(currentUid)
+end
+
+-- Non-root must verify their current password first
+if currentUid ~= 0 then
+    printInline("Current password: ")
+    local cur = ""
+    while true do
+        local ch = syscall.read(0)
+        if not ch or ch == "" then
+        elseif ch == "\n" then syscall.write(1,"\n"); break
+        elseif ch == "\b" then
+            if #cur > 0 then cur=cur:sub(1,-2); syscall.write(1,"\b \b") end
+        else cur=cur..ch; syscall.write(1,"*") end
+    end
+    local ok, err = syscall.auth_elevate(targetName, cur)
+    if not ok then
+        sleep(1)
+        print("passwd: authentication failure")
+        syscall.exit(1); return
+    end
+end
+
+printInline("New password: ")
+local pw1 = ""
+while true do
+    local ch = syscall.read(0)
+    if not ch or ch == "" then
+    elseif ch == "\n" then syscall.write(1,"\n"); break
+    elseif ch == "\b" then
+        if #pw1 > 0 then pw1=pw1:sub(1,-2); syscall.write(1,"\b \b") end
+    else pw1=pw1..ch; syscall.write(1,"*") end
+end
+
+printInline("Confirm password: ")
+local pw2 = ""
+while true do
+    local ch = syscall.read(0)
+    if not ch or ch == "" then
+    elseif ch == "\n" then syscall.write(1,"\n"); break
+    elseif ch == "\b" then
+        if #pw2 > 0 then pw2=pw2:sub(1,-2); syscall.write(1,"\b \b") end
+    else pw2=pw2..ch; syscall.write(1,"*") end
+end
+
+if pw1 ~= pw2 then
+    print("passwd: passwords do not match")
+    syscall.exit(1); return
+end
+
+local ok, err = syscall.auth_setpassword(targetUid, pw1)
+if not ok then
+    print("passwd: " .. tostring(err))
+    syscall.exit(1); return
+end
+
+print("passwd: password updated for '" .. targetName .. "'")