I wanted to update my Cygwin installation today. But no matter what I tried, the update process failed with an error message.
The error message is as follows (taken from
2016/01/25 15:00:07 running: C:\local\installed\cygwin64\system\bin\bash.exe --norc --noprofile "/etc/postinstall/ca-certificates.sh" p11-kit: couldn't set file permissions: /etc/pki/ca-trust/extracted/openssl/ca-bundle.trust.crt.iIow8G: Invalid argument p11-kit: couldn't set file permissions: /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem.WWZ1rp: Invalid argument p11-kit: couldn't set file permissions: /etc/pki/ca-trust/extracted/pem/email-ca-bundle.pem.rfSq7Z: Invalid argument p11-kit: couldn't set file permissions: /etc/pki/ca-trust/extracted/pem/objsign-ca-bundle.pem.uB4yTI: Invalid argument p11-kit: couldn't set file permissions: /etc/pki/ca-trust/extracted/java/cacerts.yivGW4: Invalid argument 2016/01/25 15:00:08 abnormal exit: exit code=1 2016/01/25 15:00:08 Changing gid to Administrators
It turned out that the problem was, that the files which
p11-kit tried to
change permissions on, had an group ID set, which was unknown to the system.
Trying to change the permissions using
chown also lead to an invalid argument
error message. At first I tried to update the entries in
/etc/group. At least that’s what a lot of (primarily old) postings around the
internet suggest. As it turns out this is not required anymore. Just delete
/etc/group files. Starting with version
1.7.34 Cygwin is now able to
directly ask Windows for user and group IDs. See subsection “Mapping Windows
SIDs to POSIX uid/gid values” in the section about Cygwin POSIX accounts,
permission, and security. By the
way. When ever you encounter any problems when updating or installing Cygwin
packages take a look at the
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