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ipn/ipnserver, paths, logpolicy: move Window config files out of %LocalAppData%

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C:\WINDOWS\system32\config\systemprofile\AppData\Local\
is frequently cleared for almost any reason: Windows updates,
System Restore, even various System Cleaner utilities.

The server-state.conf file in AppData\Local could be deleted
at any time, which would break login until the node is removed
from the Admin Panel allowing it to create a new key.

Carefully copy any AppData state to ProgramData at startup.
If copying the state fails, continue to use AppData so at
least there will be connectivity. If there is no state,
use ProgramData.

We also migrate the log.conf file. Very old versions of
Tailscale named the EXE tailscale-ipn, so the log conf was
tailscale-ipn.log.conf and more recent versions preserved
this filename and cmdName in logs. In this migration we
always update the filename to
c:\ProgramData\Tailscale\tailscaled.log.conf

Updates https://github.com/tailscale/tailscale/issues/2856

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
This commit is contained in:
Denton Gentry
2021-09-14 19:29:07 -07:00
parent 46e42292a5
commit 4bc90fee03
5 changed files with 113 additions and 12 deletions
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2
log/filelogger/log.go
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@@ -36,7 +36,7 @@ func New(fileBasePrefix, logID string, logf logger.Logf) logger.Logf {
if logf == nil {
panic("nil logf")
}
dir := filepath.Join(os.Getenv("LocalAppData"), "Tailscale", "Logs")
dir := filepath.Join(os.Getenv("ProgramData"), "Tailscale", "Logs")
if err := os.MkdirAll(dir, 0700); err != nil {
log.Printf("failed to create local log directory; not writing logs to disk: %v", err)