opkg update 做了什么？

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这是一个创建于 3421 天前的主题，其中的信息可能已经有所发展或是发生改变。

下面是我在 openwrt 里面的历史记录
1 opkg update
2 opkg install tcpdump
3 opkg install blkid
4 opkg update
5 opkg install blkid
第 2 条执行无误，执行第 3 条时，无法安装。
然后我又用 opkg update 更新可以获取的软件包列表，再次 opkg install blkid ，成功了。
我想不通里面的逻辑是什么？

10 条回复 2016-06-05 11:55:04 +08:00

lhbc

2016-06-04 22:17:03 +08:00

opkg update 就是下载仓库里的软件包信息，等同以下脚本

````
#!/bin/sh

architecture=${1-ramips}
chip=${2-mt7620}

wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/base/Packages.gz" -O /var/opkg-lists/chaos_calmer_base
wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/base/Packages.sig" -O /var/opkg-lists/chaos_calmer_base.sig
wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/luci/Packages.gz" -O /var/opkg-lists/chaos_calmer_luci
wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/luci/Packages.sig" -O /var/opkg-lists/chaos_calmer_luci.sig
wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/management/Packages.gz" -O /var/opkg-lists/chaos_calmer_management
wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/management/Packages.sig" -O /var/opkg-lists/chaos_calmer_management.sig
wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/packages/Packages.gz" -O /var/opkg-lists/chaos_calmer_packages
wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/packages/Packages.sig" -O /var/opkg-lists/chaos_calmer_packages.sig
wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/routing/Packages.gz" -O /var/opkg-lists/chaos_calmer_routing
wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/routing/Packages.sig" -O /var/opkg-lists/chaos_calmer_routing.sig
wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/telephony/Packages.gz" -O /var/opkg-lists/chaos_calmer_telephony
wget "https://downloads.openwrt.org/chaos_calmer/15.05/${architecture}/${chip}/packages/telephony/Packages.sig" -O /var/opkg-lists/chaos_calmer_telephony.sig
````

luofeiyu

2016-06-04 22:52:46 +08:00

请注意
1 opkg update
2 opkg install tcpdump
3 opkg install blkid
4 opkg update
5 opkg install blkid
这 5 条命令之间没有间隔，连续执行的。
opkg update 已经做过一次了，为何还要在安装完一个软件后，立即再来一次？
我不理解。