Based on bug #18206 sysupgrade can lead to loss of password information in
certain situations. Most likely all users who will upgrade from versions
r43017-43040, will lose their current passwords. :-(
https://dev.openwrt.org/ticket/18206
Currently /etc/shadow is defined as a conffile in base-files:
https://dev.openwrt.org/browser/trunk/package/base-files/Makefile#L37
But it is not defined in the default list of essential files to keep in
sysupgrade:
https://dev.openwrt.org/browser/trunk/package/base-files/files/lib/upgrade/keep.d/base-files-essential
If exporting conffiles info fails, /etc/shadow can get lost.
Shadow passwords are now the default, so saying that preserving /etc/passwd
is essential while /etc/shadow is not, makes no sense.
The attached patch adds /etc/shadow to the list of essential files.
The patch should probably be also applied to BB14.07.
Signed-off-by: Hannu Nyman <hannu.ny...@iki.fi>
Index: package/base-files/files/lib/upgrade/keep.d/base-files-essential
===================================================================
--- package/base-files/files/lib/upgrade/keep.d/base-files-essential
(revision 43057)
+++ package/base-files/files/lib/upgrade/keep.d/base-files-essential
(working copy)
@@ -4,6 +4,7 @@
/etc/group
/etc/passwd
/etc/profile
+/etc/shadow
/etc/shells
/etc/sysctl.conf
/etc/rc.local
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