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Description of problem:
RPM transaction library (rpmts) correctly supports setting root directory using rpmtsSetRootDir() function. This RFE is about extending this feature for rpm file iterator library (rpmfi) so it is also possible to verify files in the specified root directory without doing chroot into that directory.

The rpmfiNew() function currently completely ignores rpmts structure (which might be set to use other root directory):
https://github.com/rpm-software-management/rpm/blob/master/lib/rpmfi.c#L1756


Version-Release number of selected component (if applicable):
rpm-4.11.3-32.el7.x86_64
rpm-libs-4.11.3-32.el7.x86_64
rpm-devel-4.11.3-32.el7.x86_64

Update of the description:

The Github link that points to the code that will likely require modification needs to reference a certain changeset, so links to the lines link still the same code.
So here is the fixed Github link:

https://github.com/rpm-software-management/rpm/blob/370c58746c3b8c178808aaa95e1acb009fc4a677/lib/rpmfi.c#L1865

The rpmts argument is accepted by rpmfiNew, but it is not passed on.

Passing arguments has little to do with it.

The issue is that by offering to handle root directory calculation (always assuming somebody wrote such code) rpm would take responsibility of things like ensuring relative paths dont escape the root, which is a responsibility we rather let the OS handle. Besides, verify in a chroot does not work correctly anyway wrt user/group if and when they differ between the "host" and the root.

In other words, things haven't changed at all since this was closed, and we have no plans to implement such functionality.