[Rpm-maint] [rpm-software-management/rpm] rpmdb --exportdb does not work on read-only fs (Issue #3371)

[Panu Matilainen]

rpmdb --exportdb calls rpmtxnBegin() with RPMTXN_READ flags. Internally that function calls rpmlockNew() and rpmlockAcquire(). Neither function has a flags parameter to specify what kind of lock is requested. rpmlockNew() automatically creates a read lock if it can't open the .rpm.lock file in RW mode. rpmlockAcquire() however wants to establish a write lock always so won't work on a read-only lock.

So in the end it means that means rpmdb --exportdb only works as root on a read-write file system. Doesn't work for unprivileged users, nor on read only file systems. That doesn't seem to be intentional given the rpmlockNew() fallback to a read lock.

(and yes, this is an exact duplicate of #1266, which for whatever reason isn't getting synced to our Jira which messes up our stuff, so apologies for the noise)

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