rofiles-fuse − Use FUSE to create a view where directories are writable, files are immutable
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rofiles−fuse SRCDIR MNTPOINT |
Creating a checkout from an OSTree repository by default uses hard links, which means an in−place mutation to any file corrupts the repository and all checkouts. This can be problematic if one wishes to run arbitrary programs against such a checkout. For example, RPM %post scripts or equivalent.
In the case where one wants to create a tree commit derived from other content, using rofiles−fuse in concert with ostree commit −−link−checkout−speedup (or the underlying API) can ensure that only new files are checksummed.
# Initialize a
checkout and mount
$ ostree −−repo=repo checkout somebranch
branch−checkout
$ mkdir mnt
$ rofiles−fuse branch−checkout mnt
# Now,
arbitrary changes to mnt/ are reflected in
branch−checkout
$ echo somenewcontent > mnt/anewfile
$ mkdir mnt/anewdir
$ rm mnt/someoriginalcontent −rf
# Commit and
cleanup
$ fusermount −u mnt
$ ostree −−repo=repo commit
−−link−checkout−speedup −b
somebranch −s 'Commit new content'
−−tree=dir=branch−checkout
$ rm mnt branch−checkout −rf
ostree(1)