el: 优化判断系统是否为 el7 家族

trans.sh

@@ -3146,6 +3146,11 @@ del_default_user() {
     done < <(grep -v nologin$ "$os_dir/etc/passwd" | cut -d: -f1 | grep -v root)
 }
 
+is_el7_family() {
+    is_have_cmd_on_disk "$1" yum &&
+        ! is_have_cmd_on_disk "$1" dnf
+}
+
 install_qcow_by_copy() {
     info "Install qcow2 by copy"
 
@@ -3307,18 +3312,13 @@ install_qcow_by_copy() {
         # selinux kdump
         disable_selinux_kdump /os
 
-        # centos7 删除 machine-id 后不会自动重建
+        # el7 删除 machine-id 后不会自动重建
         clear_machine_id /os
 
-        # el7 yum 可能会使用 ipv6，即使没有 ipv6 网络
-        if [ "$releasever" = 7 ]; then
-            if [ "$(cat /dev/netconf/eth*/ipv6_has_internet | sort -u)" = 0 ]; then
-                echo 'ip_resolve=4' >>/os/etc/yum.conf
-            fi
-        fi
-
-        # centos 7 eol 特殊处理
-        if [ "$releasever" = 7 ] && [ -f /os/etc/yum.repos.d/CentOS-Base.repo ]; then
+        # el7 forks 特殊处理
+        if is_el7_family /os; then
+            # centos 7 eol 换源
+            if [ -f /os/etc/yum.repos.d/CentOS-Base.repo ]; then
                 # 保持默认的 http 因为自带的 ssl 证书可能过期
                 if is_in_china; then
                     mirror=mirror.nju.edu.cn/centos-vault
@@ -3329,18 +3329,22 @@ install_qcow_by_copy() {
                     -e "s,#(baseurl=http://)mirror.centos.org,\1$mirror," /os/etc/yum.repos.d/CentOS-Base.repo
             fi
 
+            # el7 yum 可能会使用 ipv6，即使没有 ipv6 网络
+            if [ "$(cat /dev/netconf/eth*/ipv6_has_internet | sort -u)" = 0 ]; then
+                echo 'ip_resolve=4' >>/os/etc/yum.conf
+            fi
+
+            # el7 安装 NetworkManager
+            # anolis 7 镜像自带 NetworkManager
+            chroot_dnf install NetworkManager
+        fi
+
         # firmware + microcode
         if is_need_ucode_firmware; then
             # shellcheck disable=SC2046
             chroot_dnf install $(get_ucode_firmware_pkgs)
         fi
 
-        # centos 7 安装 NetworkManager
-        if [ "$releasever" = 7 ]; then
-            chroot_dnf install NetworkManager
-        fi
-        # anolis 7 镜像自带 nm
-
         # 删除云镜像自带的 dhcp 配置，防止歧义
         # clout-init 网络配置在 /etc/sysconfig/network-scripts/
         rm -rf /os/etc/NetworkManager/system-connections/*.nmconnection