--postfix.logfile_path="/var/log/mail" produces panic: runtime error: invalid memory address or nil pointer dereference

[jsutch]

This appears to be similar to #54

logs are stored in /var/log/mail instead of /var/log/maillog, passing new logdir crashes on startup.

build@mail:~/INSTALL/postfix_exporter# ./postfix_exporter --postfix.logfile_path="/var/log/mail"
2020/10/05 00:09:24 Reading log events from /var/log/mail
2020/10/05 00:09:24 Listening on :9154
2020/10/05 00:09:24 Seeked /var/log/mail - &{Offset:0 Whence:2}
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0x832089]

goroutine 8 [running]:
main.(*PostfixExporter).CollectLogfileFromFile(0xc00016a000, 0x9e5740, 0xc000066700)
/postfix_exporter/postfix_exporter.go:437 +0x149
main.(*PostfixExporter).StartMetricCollection(0xc00016a000, 0x9e5740, 0xc000066700)
/postfix_exporter/postfix_exporter.go:671 +0xfd
created by main.main
/postfix_exporter/main.go:69 +0xecb

[ghostiam]

I had the same problem. I already studied the code and thought that the problem is in the tail library, until I realized that there is an error in the readme, and tail cannot open the directory.

Use:
--postfix.logfile_path=/var/log/mail/mail.log