You'd expect
ostree commit --tree=ref=A --tree=ref=B
to produce a commit with the union of the trees given. Instead you'd get
a commit with the contents of just the latter commit. This was due to an
optimisation where we'd skip filling out the `files` and `subdirs`
members of the mtree, just filling in the metadata instead. This backfires
becuase this same code relies on checking the `files` and `subdirs` members
itself to work out whether the mtree is empty.
This commit removes the optimisation, fixing the bug. Maybe there's a way
to keep the optimisation and still fix the bug but it's not obvious to
me.
Closes: #581
Approved by: cgwalters
musl libc's implementation of `realpath` works by opening the path and then
doing a lookup in `/proc/self/fd` to find the canonical path. This fails
if `/proc` is not mounted. This causes problems for us if
`ostree-prepare-root` is `init` as `/proc` won't be mounted.
We have to mount `/proc` anyway for `/proc/cmdline` so this fix just
expands the scope over which `/proc` is mounted to include both our
`realpath` calls.
See also:
* http://www.openwall.com/lists/musl/2016/06/08/2 and
* http://git.musl-libc.org/cgit/musl/tree/src/misc/realpath.c?id=e738b8cbe64b6dd3ed9f47b6d4cd7eb2c422b38dCloses: #485
Approved by: cgwalters
I've seen it fail with musl which needs `/proc` to be mounted for it to
work. The error messages we're rather confusing before. At least this
now points to the right location.
Closes: #485
Approved by: cgwalters
This test previously depended on manually building ostree-prepare-root.
Since 42dab85 we've been able to build static binaries with the usual
autotools build-system. This change reflects the fact that
`ostree-prepare-root` is built into $srcdir rather than `src/switchroot`
where I was building manually.
This test now passes with `./configure --with-static-compiler=gcc` (glibc)
but still fails with `./configure --with-static-compiler=musl-gcc` (musl).
Closes: #485
Approved by: cgwalters
Was failing with error:
src/switchroot/ostree-prepare-root.c:30:20: fatal error: config.h: No such file or directory
compilation terminated.
Reported by and fix provided by @gatispaeglis.
Closes: #485
Approved by: cgwalters
This simplifies the build system by removing the need for
`libswitchroot-mountutil.la`.
Original idea by @cgwalters in #477.
Closes: #478
Approved by: cgwalters
The `warn()` libc extension has exactly the same behaviour as our own
`perrorv` function, but is available in (at least) glibc and musl. As an
added bonus the similar function `err()` which will exit with an error
code afterwards.
This implementation is tidier and allows us to get rid of our own
`perrorv`. It paves the way to removing `ostree-mount-util.c` to simplify
the build scripts.
Original idea by @cgwalters in #477.
Closes: #478
Approved by: cgwalters
If the `--with-static-compiler=musl-gcc` configure flag is given.
ostree-prepare-root can be used as init in a system without a populated
/lib. To support this use case we need to link statically as we will be
unable to locate libc.so at run time if it's not installed in /lib.
We support building ostree-prepare-root with a different compiler to the
rest of ostree so we can use musl rather than glibc. This reduces the size
of the executable significantly: from ~700K -> ~30K. We have to use
`_SCRIPTS` here to get autotools to install this as an executable but
without generating rules to make it itself which we have specified
manually.
See https://lists.gnu.org/archive/html/help-gnu-utils/2007-01/msg00007.html
for advice on using autotools in this manner.
Closes: #477
Approved by: cgwalters
POSIX and GNU define conflicting versions of `strerror_r`. The GNU
version returns the string but doesn't necessilary write into buf.
The POSIX version writes into buf and returns the length but doesn't
necessilary append a terminate the string with a NUL if it's too long
to fit in buf.
This commit fixes building ostree-prepare-root with musl libc. The
stripped static build with musl on my machine is 30K vs. 724K with glibc
static and 11K with glibc shared.
Closes: #477
Approved by: cgwalters
This allows ostree-prepare-root outside of the initramfs context where the
real rootfs is already mounted at /. We can't use `mount --move` in this
case because we would be trying to move / into a subdirectory of itself.
Closes: #403
Approved by: cgwalters
...for simplicity. This way we don't need to keep concatenating
deploy_path to everything. We can just refer relative to the current
working directory.
We need to do this after bind-mounting it over itself otherwise our cwd
is still on the non-bind-mounted filesystem below.
Closes: #403
Approved by: cgwalters
Typically we have our ready made-up up root at
`/sysroot/ostree/deploy/.../` (`deploy_path`) and the real rootfs at
`/sysroot` (`root_mountpoint`). We want to end up with our made-up root
at `/sysroot/` and the real rootfs under `/sysroot/sysroot` as systemd
will be responsible for moving `/sysroot` to `/`.
We need to do this in 3 moves to avoid trying to move `/sysroot` under
itself:
1. `/sysroot/ostree/deploy/...` -> `/sysroot.tmp`
2. `/sysroot` -> `/sysroot.tmp/sysroot`
3. `/sysroot.tmp` -> `/sysroot`
This is a refactoring to group all these operations together so I can
implement an alternative in terms of `pivot_root`.
Closes: #403
Approved by: cgwalters
This supports running ostree on embedded platforms without an initrd.
Specificially I'm trying to do bringup on an NVidia Tegra based Jetson TK1
dev board.
Closes: #403
Approved by: cgwalters
These tests use unshare and mount to prepare a fake initrd/early boot
directory structure so we can then test ostree-prepare-root.
Things that are tested:
* Running in an initrd environment
* Running without initrd
* /var and /sysroot being mounted correctly
* /usr being mounted read-only
Things not tested (yet):
* Running as init - this could be accomplished by unsharing the pid
namespace too.
* mounting/unmounting `/proc` if `/proc/cmdline` isn't available
* Persistent overlayfs for `/usr`
* Probably other things
The tests are basic but can be extended in the future as we do more work
on `ostree-prepare-root`.
These tests must be run as root as they require the ability to `mount`
and to `unshare` the mount namespace. Perhaps in the future we can use
user namespaces for this test once they are more widely available.
Closes: #403
Approved by: cgwalters
William Manley