package/shadow: new package

shadow provides utilities to deal with user accounts.

The shadow package includes the necessary programs for converting UNIX
password files to the shadow password format, plus programs for managing
user and group accounts. Especially it is useful if rootless podman
container should be used, which requires newuidmap and newgidmap.

Co-authored-by: Nicolas Carrier <Nicolas.Carrier@orolia.com>
[Nicolas.Carrier@orolia.com provided the test case]
Signed-off-by: Raphael Pavlidis <raphael.pavlidis@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/test_shadow.py

@@ -0,0 +1,55 @@
+import os
+
+from infra.basetest import BRTest, BASIC_TOOLCHAIN_CONFIG
+
+
+class TestShadow(BRTest):
+    username = 'user_test'
+    config = BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_arm=y
+        BR2_PACKAGE_SHADOW=y
+        BR2_TARGET_ROOTFS_EXT2=y
+        BR2_TARGET_ROOTFS_EXT2_4=y
+        BR2_TARGET_ROOTFS_EXT2_SIZE="65536"
+        """
+    timeout = 60
+
+    def login(self):
+        img = os.path.join(self.builddir, "images", "rootfs.ext4")
+        self.emulator.boot(arch="armv7",
+                           kernel="builtin",
+                           kernel_cmdline=["root=/dev/mmcblk0",
+                                           "rootfstype=ext4"],
+                           options=["-drive", f"file={img},if=sd,format=raw"])
+        self.emulator.login()
+
+    def test_nologin(self):
+        self.login()
+
+        self.assertRunOk("! nologin")
+        cmd = 'test "$(nologin)" = "This account is currently not available."'
+        self.assertRunOk(cmd)
+
+    def test_useradd_del(self):
+        username = self.username
+        self.login()
+
+        self.assertRunOk(f'userdel {username} || true')
+        self.assertRunOk(f'groupdel {username} || true')
+        self.assertRunOk(f'useradd -s /bin/sh {username}')
+        self.assertRunOk(f'test $(su {username} -c "whoami") = {username}')
+        self.assertRunOk(f'userdel {username}')
+
+    def test_usermod(self):
+        username = self.username
+        new_home = '/tmp'
+        self.login()
+
+        self.assertRunOk(f'userdel {username} || true')
+        self.assertRunOk(f'groupdel {username} || true')
+        self.assertRunOk(f'useradd -s /bin/sh {username}')
+        self.assertRunOk(f'usermod {username} --home {new_home}')
+        self.assertRunOk(f'test $(su {username} -c \'echo $HOME\') = {new_home}')
+        self.assertRunOk(f'userdel {username}')
+