Commit Graph

880 Commits

Author SHA1 Message Date
Chris Lumens
93d084b30a Add error IDs for common source-related errors.
(cherry picked from commit e43adfc7af)
2018-08-09 16:50:07 -04:00
Chris Lumens
a1803c218f Add error IDs for unknown modules and unknown projects.
(cherry picked from commit 2adcfc9563)
2018-08-09 16:50:03 -04:00
Chris Lumens
56da204f13 Add error IDs for when an unknown commit is requested.
(cherry picked from commit 07528a431e)
2018-08-09 16:49:54 -04:00
Chris Lumens
22d75526ef Add error IDs for when an unknown blueprint is requested.
This adds some fairly redundant code to the beginning of all the
blueprint routes to attempt reading a commit from git for the
blueprint's recipe.  If it succeeds, the blueprint exists and the route
can continue.  Otherwise, return an error.  Hopefully this doesn't slow
things down too much.

(cherry picked from commit a925cc7ddb)
2018-08-09 16:49:48 -04:00
Chris Lumens
36b6444050 Add error IDs for when an unknown build UUID is requested.
Note that this also changes the return type of uuid_info to return None
when an unknown ID is given.  The other uuid_* functions are fine
because they are checked ahead of time.

(cherry picked from commit 6497b4fb65)
2018-08-09 16:49:38 -04:00
Chris Lumens
ea10339ef4 Add error IDs for bad state conditions.
(cherry picked from commit d76e24053a)
2018-08-09 16:49:16 -04:00
Chris Lumens
672708e68d Change the error return type for bad limit= and offset=.
Each element in the errors value is now a dict, with a msg field and an
id field.  The id field contains a value out of errors.py that can be
used by the front end to key on.  The msg field is the same as what's
been there.

The idea is to keep the number of IDs somewhat limited so there's not a
huge number of things for the front end to know.

(cherry picked from commit 9677b012da)
2018-08-09 16:49:07 -04:00
Chris Lumens
78ae380eb3 Don't sort error messages.
This should make it easier to return more complex error structures.  It
also doesn't appear to matter - tests still pass without changes.

(cherry picked from commit 4c3f93e329)
2018-08-09 16:48:57 -04:00
Chris Lumens
dbc4d08de4 Run as root/weldr by default.
We need to be root to read the certificates that give access to the
package repos.  Right now, the alternative seems to be changing
permissions on the certs themselves, which seems less good.  We're
running anaconda as root anyway.
2018-08-08 17:07:59 -07:00
Brian C. Lane
8b0c4a8465 Add + to the allowed API string character set 2018-08-07 16:48:25 -07:00
Brian C. Lane
f7c4c3f5d5 Add job_* timestamp support to compose status 2018-08-07 15:34:35 -07:00
Will Woods
e673fd5927 composer-cli: clean up "list" commands
This patch does two things:

1) Add "compose list", which lists compose UUIDs and other basic info,
2) Fix up "blueprints list", "modules list", "sources list", and
   "compose types" so their output is just a plain list of identifiers
2018-08-07 12:12:17 -07:00
Brian C. Lane
991091c287 Add input string checks to the branch and format arguments
Make sure no UTF8 characters are allowed and return an error if they
are.

Also includes tests to make sure the correct error is returned.

(cherry picked from commit 86d79cd8a6)
2018-08-07 12:12:17 -07:00
Brian C. Lane
8786c9764c Add a test for invalid characters in the API route
Currently the code is not UTF8 safe, so we need to return a clear error
when invalid characters are passed in.

This also adds tests for the routes to confirm that an error is
correctly returned.

(cherry picked from commit 74f5def3d4)
2018-08-07 12:12:17 -07:00
Brian C. Lane
03e339cbe5 Fix logging argument 2018-08-07 12:12:17 -07:00
Brian C. Lane
2b0efff9e4 Fix write_timestamp for py3
toml.dumps() returns a string for write() so .encode is not needed.
2018-08-07 12:12:17 -07:00
Chris Lumens
95462600fa Return a JSON error instead of a 404 on certain malformed URLs.
This handles the case where a route is requested, but without a required
parameter.  So, /blueprints/info is requested instead of
/blueprints/info/http-server.  It accomplishes this via a decorator, so
a lot of these route-related functions now have quite a few decorators
attached to them.

Typo'd URLs (/blueprints/nfo for instance) will still return a 404.  I
think this is a reasonable thing to do.

(cherry picked from commit 5daf2d416a)
2018-08-07 12:12:17 -07:00
Chris Lumens
191897d40e Return an error if /modules/info doesn't return anything.
Unfortunately, this isn't very useful if /modules/info is provided with
multiple modules.  yum doesn't traceback when doPackageLists is given
something that doesn't exist.  It just returns an empty list.  If
/modules/info is given just one module and yum gives us an empty list,
it's easy to say what happened.  If /modules/info is given several
modules and just one does not exist, we will not be able to detect that.

Fixing this would require doing more yum operations, which is likely to
slow things down and isn't the direction I want to be going.

(cherry picked from commit 8e948e4a4d)
2018-08-07 12:12:17 -07:00
Chris Lumens
3e3598cd95 Update documentation (#409).
(cherry picked from commit 6193a7c9d8)
2018-08-07 12:12:17 -07:00
Chris Lumens
e4d06b587d Use constants instead of strings (#409).
(cherry picked from commit fdf4d63f3b)
2018-08-07 12:12:17 -07:00
Chris Lumens
83196b5f6f Write timestamps when important events happen during the compose (#409).
Right now, this is when the compose is queued up, when it is started by
anaconda, and when it is finished (whether that's success or not).

(cherry picked from commit 3ba9d53b8b)
2018-08-07 12:12:17 -07:00
Chris Lumens
40ff8faad8 Return multiple timestamps in API results (#409).
If one of the timestamps isn't present (for instance, the finished
timestamp for a job that is still running), null is returned.

(cherry picked from commit 17c40ef271)
2018-08-07 12:12:17 -07:00
Chris Lumens
099cdfcd03 Add a new timestamp.py file to the API directory (#409).
This is responsible for writing out a new times.toml file, containing
important timestamps in the life of a compose.  This seems a little more
reliable than attempting to infer things from the filesystem, especially
in light of the fact that we can't ever really know when a file was
created.

(cherry picked from commit b59d59b124)
2018-08-07 12:12:17 -07:00
Brian C. Lane
f791d5aff6 composer-cli: Add support for Group to blueprints diff
(cherry picked from commit 2edd7a995b)
2018-08-07 12:12:17 -07:00
Brian C. Lane
5af7ad6600 Update status.py to use new handle_api_result
Use the new function to properly handle error responses for all the
commands.

(cherry picked from commit 642f117d54)
2018-08-07 12:12:17 -07:00
Brian C. Lane
926d88a3bd Update sources.py to use new handle_api_result
Use the new function to properly handle error responses for all the
commands.

(cherry picked from commit 3205e47a13)
2018-08-07 12:12:17 -07:00
Brian C. Lane
7e999cc9c6 Update projects.py to use new handle_api_result
Use the new function to properly handle error responses for all the
commands.

(cherry picked from commit 77767cd93a)
2018-08-07 12:12:17 -07:00
Brian C. Lane
ecefa18110 Update modules.py to use new handle_api_result
Use the new function to properly handle error responses for all the
commands.

(cherry picked from commit b55b86d0b3)
2018-08-07 12:12:17 -07:00
Brian C. Lane
92f5860182 Update compose.py to use new handle_api_result
Use the new function to properly handle error responses for all the
commands.

(cherry picked from commit 760aeb61a7)
2018-08-07 12:12:17 -07:00
Brian C. Lane
e21c53f507 Update blueprints.py to use new handle_api_result
Use the new function to properly handle error responses for all the
commands.

(cherry picked from commit c1c5536ec8)
2018-08-07 12:12:17 -07:00
Brian C. Lane
85b2807a15 Modify handle_api_result so it can be used in more places
Some results have errors and no status, others have status and errors.
Update the function to return the final rc to exit with, and a bool
indicating whether or not to continue processing the other fields.

Add a bunch of tests for the new function to make sure I have the logic
correct.

(cherry picked from commit 35fa067219)
2018-08-07 12:12:17 -07:00
Brian C. Lane
619026ff3d Update to use only qemu-kvm
We only have qemu-kvm available, so use that. This also means that there
will not me any support for using qemu with arches that are different
from the host.
2018-07-27 15:10:22 -07:00
Chris Lumens
c3987cc4cb Fix help output on the compose subcommand.
(cherry picked from commit a3572c9fdd)
2018-07-26 14:53:57 -04:00
Chris Lumens
db98df8373 Add timestamps to "compose-cli compose status" output.
(cherry picked from commit 7bcb61849d)
2018-07-26 14:53:53 -04:00
Chris Lumens
5ff96bc627 And then add real output to the status command.
(cherry picked from commit eb0939d967)
2018-07-26 14:53:50 -04:00
Chris Lumens
c6efcd1fc2 Add the beginnings of a new status subcommand.
(cherry picked from commit 9eafc60fa0)
2018-07-26 14:53:47 -04:00
Brian C. Lane
4b8211a471 composer-cli: Fix non-zero epoch in projets info
The json value is an int, so convert it to a str.

(cherry picked from commit 18521cec1a)
2018-07-25 11:39:55 -07:00
Brian C. Lane
d50321239c Log and exit on metadata update errors at startup
A bad system repo can cause lorax-composer to fail to start. Instead of
a traceback log the error and exit.

(note that the exit still results in an OSError traceback due to part of
it running as root, this needs to be addressed in another commit).

(cherry picked from commit 49380b4b49)
2018-07-19 11:01:08 -07:00
Brian C. Lane
ea5e34e9c6 Check /projects responses for null values.
Some values can be null/None so check for that instead of crashing.

(cherry picked from commit de0e5d2b59)
2018-07-19 11:00:58 -07:00
Brian C. Lane
9e3469b354 Clarify error message from /source/new
(cherry picked from commit 5993802bc6)
2018-07-19 11:00:54 -07:00
Chris Lumens
67b4a6c1eb Support loading groups from the kickstart template files.
(cherry picked from commit 1de67f4f63)
2018-07-19 11:00:46 -07:00
Chris Lumens
22ddaa667e Include groups in depsolving.
This adds a new argument to projects_depsolve and
projects_depsolve_with_size that contains the group list, unfortunately.
I would have prefered adding a function that just returns a list of all
the contents of a group and then add that to what was being passed into
projects_depsolve.  However, there does not appear to be any good way to
do that in yum aside from a lot of grubbing around in the comps object,
which I am unwilling to do.

(cherry picked from commit 0259f3564d)
2018-07-19 11:00:16 -07:00
Chris Lumens
76c811b7b8 Add help output to each subcommand.
This is the same as the output at the top level, just trimmed down to
only the options for a single subcommand.  It's trigged by providing
"help" or "--help" as a subcommand option.

(cherry picked from commit f5115291bd)
2018-07-19 10:59:45 -07:00
Chris Lumens
cd5c9385f6 Split the help output into its own module.
This means I can reuse it for help output for individual subcommands.

(cherry picked from commit 0179a976ba)
2018-07-19 10:59:38 -07:00
Chris Lumens
eca6a01008 If the help subcommand is given, print the help output.
This isn't a real subcommand like the others.  The option processing
just intercepts it and prints the output.  Given that we're subcommand
based, it makes sense to support this in addition to --help.

(cherry picked from commit 18620700fd)
2018-07-19 10:59:31 -07:00
Brian C. Lane
3f054d6a3a Check the compose templates at startup
Depsolve the packages included in the templates and report any errors
using the /api/status 'msgs' field. This should help narrow down
problems with package sources not being setup correctly.

(cherry picked from commit d92f2f5b04)
2018-07-13 10:17:08 -07:00
Adam Williamson
6b8009ce8f DNF 3: progress callback constants moved to dnf.transaction
Signed-off-by: Adam Williamson <awilliam@redhat.com>
(cherry picked from commit 4a3f9e12aa)
2018-06-28 16:20:26 -07:00
Brian C. Lane
a1905c3b4b Add --dracut-arg support to lorax
Use it to override the default dracut arguments (displayed as part of
the --help output). If you want to extend the default arguments they
all need to be passed in on the cmdline as well. eg.

--dracut-arg='--xz' --dracut-arg='--install /.buildstamp' ...

Resolves: rhbz#1452220
(cherry picked from commit d8ce013a2b)
2018-06-07 09:01:42 -07:00
Brian C. Lane
b9fe90000e gevent has deprecated .wsgi, should use .pywsgi instead
https://github.com/gevent/gevent/blob/master/doc/api/gevent.wsgi.rst
(cherry picked from commit c9ca451568)
2018-06-05 16:58:25 -07:00
Brian C. Lane
0314cbd0e8 Add support for sources to composer-cli
This adds the sources command which can be used to list, add, change,
and delete sources using the TOML formatted source file.

(cherry picked from commit 6f6ce410c0)
2018-06-04 15:48:41 -07:00
Brian C. Lane
693dc9a6f6 Fix DNF related issues with source selection
DNF Repo.dump() function cannot be used as a .repo file for dnf due to
it writing baseurl and gpgkey as a list instead of a string. Add a new
function to write this in the correct format, and limited to the fields
we use.

Add a test for the new function.

Fix /projects/source/info to return an error 400 if a nonexistant TOML
source is requested. If JSON is used the error is part of the standard
response.

Update test_server.py to check for the correct error code.

(cherry picked from commit afa89ea657)
2018-06-04 15:47:38 -07:00
Brian C. Lane
1ab33b6416 Fix handling bad source repos and add a test
When adding a source failed it wasn't being removed from the dnf object.
This fixes that, and returns an error when setting up the source fails.
Also adds a test for it.
This also includes detecting rawhide vs. non-rawhide releases and
adjusting the tests accordingly (some of the source names change).

(cherry picked from commit dd8e4d9e99)
2018-06-04 15:47:32 -07:00
Brian C. Lane
a283ec9582 Fix make_dnf_dirs
It was chopping off an extra directory level due to realpath removing
the trailing / from the paths when they are setup.

(cherry picked from commit 23f4b2a3ec)
2018-06-04 15:47:15 -07:00
Brian C. Lane
8ac04a1521 Add support for user defined package sources API
This lives under /api/v0/projects/source/*

See the documentation for details

(cherry picked from commit 6d677b2207)
2018-06-04 15:47:00 -07:00
Colin Walters
e5ef195a3b templates: Stop using gconfset
We had only been indirectly pulling in GConf, and anyways
nothing was listening to these keys.

<kalev> I still think it's a fallout from 27a90d973f

Really in general, if we wanted to make changes like this
it'd probably be a lot simpler to do them on boot or so.

https://bugzilla.redhat.com/show_bug.cgi?id=1581838
(cherry picked from commit bb3d8edd06)
2018-05-24 09:13:05 -07:00
Brian C. Lane
1af6040143 Add support for version globs to blueprints
This uses dnf's version__glob filter to implement it. It amounts to '*'
wildcards and '?' for single character matching.

(cherry picked from commit 095829171a)
2018-05-21 15:41:45 -07:00
Brian C. Lane
55b89d1aeb Add support for systemd socket activation
Instead of enabling lorax-composer.service enable lorax-composer.socket
and it will start lorax-composer on first access to
/run/weldr/api.socket
2018-05-17 10:34:35 -07:00
Brian C. Lane
e7f9028fca Move lorax-composer and composer-cli argument parsing into modules
This allows sphinx-argparse to document them automatically.
2018-05-17 10:34:35 -07:00
Brian C. Lane
cd1d414e0e Add new cmdline args to compose_args settings 2018-05-17 10:34:35 -07:00
Brian C. Lane
e91aed9b10 Remove temporary files after run_compose
A crash can also leave temporary lmc-* files, remove them as well.
2018-05-17 10:34:35 -07:00
Brian C. Lane
611f5e62f3 Add --proxy to lorax-composer cmdline
Overrides the [dnf] proxy setting in the config file.
2018-05-17 10:34:35 -07:00
Brian C. Lane
d9c4a6c951 Pass the --tmp value into run_creator and cleanup after a crash
Crashing can sometimes leave directories in /var/tmp/lmc-* so clean
those up after run_creator is finished.
2018-05-17 10:34:35 -07:00
Brian C. Lane
559b66b7e3 Add --tmp to lorax-composer and set default tempdir
It was using /tmp/ which can fill up quickly when building images.
Default to /var/tmp unless the user passes --tmp /tmp/
2018-05-17 10:34:35 -07:00
Brian C. Lane
bb652368dc Set lorax_templates to the correct directory
Templates are under the share dir, so use find_templates() to find them.
2018-05-17 10:34:35 -07:00
Brian C. Lane
d6283f9540 Adjust the disk size estimates to match Anaconda
First is Anaconda uses 6k blocks per file for its estimate, and it
fudges by 10% so adjust for those with an extra 10% of headroom just in
case.

Second is an Anaconda bug that won't allow it to do a kickstart install
to a disk smaller than 3000 MB. There is a PR to fix it upstream, but
for now the minimum size has to be 3000e9
2018-05-17 10:34:35 -07:00
Brian C. Lane
5443c1cfea Skip creating groups with the same name as a user
Otherwise the user creation fails when anaconda sees there is already a
group with that name. Log a warning and continue on.
2018-05-17 10:34:35 -07:00
Brian C. Lane
cb7e4e55ba Add user and group creation to blueprint
[[customizations.user]] and [[customizations.group]]
2018-05-17 10:34:34 -07:00
Brian C. Lane
8839182f43 Add blueprint customization support for hostname and ssh key
This adds support for the optional blueprint section [customizations].

Use it like this:

[customizations]
hostname = yourhostnamehere

[[customizations.sshkey]]
user = root
key = root user key
2018-05-17 10:34:34 -07:00
Brian C. Lane
fb58277028 Add composer-cli and tests 2018-05-17 10:34:34 -07:00
Brian C. Lane
b67c821706 Fix the compose arguments for the Fedora version of Anaconda
This adds make_oci, and moves qcow2 to the more generic image_type
(which just uses qemu-img disk names).
2018-05-17 10:34:34 -07:00
Brian C. Lane
b6e0ba2e45 Add selinux check to lorax-composer
anaconda needs to have SELinux set to disabled or permissive in order to
run correctly. Check at startup and exit with an error.
2018-05-17 10:34:34 -07:00
Brian C. Lane
e6145faf86 Convert Yum usage to DNF
The DNF api is similar, but not the same, as Yum. Make the needed
changes, and rename yum references to dnf to avoid confustion later.
2018-05-17 10:34:34 -07:00
Brian C. Lane
c4a09c42cc workspace read and write needs UTF-8 conversion
reading needs to decode the bytes to str and writing needs to encode the
str to bytes.
2018-05-17 10:34:34 -07:00
Brian C. Lane
99cdd573a3 Return an empty list if depsolve results are empty 2018-05-17 10:34:34 -07:00
Brian C. Lane
6aa52b0b53 The git blob needs to be bytes
In py3 str is unicode so it needs to be encoded as UTF-8 when writing to
the blob.
2018-05-17 10:34:34 -07:00
Brian C. Lane
0f59710b36 Use default commit sort order instead of TIME
Different versions of libgit2 act differently. Using TIME results in
some commits (like a revert) being listed correctly, but the rest being
listed in reverse order. Leaving it at the default works for
libgit2-0.26.3
2018-05-17 10:34:34 -07:00
Brian C. Lane
cb0158ca22 Add lorax-composer and the composer kickstart templates 2018-05-17 10:34:34 -07:00
Brian C. Lane
9085840401 Update pylorax.api.projects for DNF usage
And adjust tests to match.
2018-05-17 10:34:34 -07:00
Brian C. Lane
e1be281fbb Update dnfbase (formerly yumbase) for DNF support
And adjust tests to match.
2018-05-17 10:34:34 -07:00
Brian C. Lane
7fa009c66e Move core of livemedia-creator into pylorax.creator
This moves everything except the cmdline checking into run_creator in
pylorax.creator

It also rearranges some functions to prevent import loops, and adds a
utility function to imgutils (mkfsimage_from_disk for copying a
partition into a filesystem image).
2018-05-17 10:34:34 -07:00
Brian C. Lane
25394eefb7 Convert lorax-composer yum base object to DNF
This no longer uses the enabled configuration setting to select repos to
use. It uses everything in the repo_dir, and if system repos have not
been disabled it copies them into the repo_dir at startup, overwriting
the previous copy.
2018-05-17 10:34:34 -07:00
Brian C. Lane
9bf93d7154 Use 2to3 to convert the python2 lorax-composer code to python3 2018-05-17 10:34:34 -07:00
Brian C. Lane
fc56671638 livemedia-creator: Move core functions into pylorax modules
This reduces the amount of code in livemedia-creator to the cmdline
parsing and calling of the installer functions. Moving them into other
modules will allow them to be used by other projects, like the
lorax-composer API server.
2018-05-17 10:34:34 -07:00
Brian C. Lane
39673941a8 Check selinux state before creating output directory
This closes issue #163

(cherry picked from commit dc348fac25)
2018-05-17 10:34:34 -07:00
Brian C. Lane
3b1933b400 Update default releasever to Fedora 28 2018-03-15 13:52:20 -07:00
Brian C. Lane
e1c839de1c Fix _install_branding
filter(provides=...) doesn't work with paths. The release packages
provide system-release so just look for that instead of a file.

Now it finds the release package and selects it along with the
corresponding logos package.

Note, this has been broken since commit 431ca6ce
2018-02-23 12:50:07 -08:00
Yuval Turgeman
68d1f4208d LMC: Make the QEMU RNG device optional
Added a new QEMU argument '--with-rng' to specify a RNG device other
than /dev/random or "none".

Signed-off-by: Yuval Turgeman <yturgema@redhat.com>
2018-01-23 08:22:38 -08:00
Brian C. Lane
dc635a97f6 Write the --variant string to .buildstamp as 'Variant=' 2018-01-17 09:38:16 -08:00
Brian C. Lane
629d04dc68 Fix installpkg exclude operation
Commit 8edaefd4d1 added the ability to install specific NVR's of
packages, but it did not adjust the exclude operation to account for
this.

This patch fixes that, applying the exclude only to the name part of the
package NVR, and changes some variable names to pkgnvr/pkgnvrs to make
it more clear that the content has changed to <name>-<version>-<release>
2018-01-15 08:38:43 -08:00
Brian C. Lane
73628a6e07 Log a more descriptive error when setfiles fails (#1499771)
Some lorax users run it from inside mock, which isn't able to detect
whether the host is in Permissive mode. This can lead to confusing
error messages, so this points them in the right direction.
2017-11-27 12:03:45 -08:00
Claudio Zumbo
8edaefd4d1 Allow installpkgs to do version pinning through globbing 2017-11-10 09:56:27 -08:00
Brian C. Lane
6147d58ccf Use bytes when writing strings in mk-s390-cdboot (#1504026)
python3 needs bytes when calling .write()
2017-10-19 14:37:12 -07:00
Brian C. Lane
aa0067e32c Convert mk-s390-cdboot to python3 (#1497141)
It was pulling in py2 along with py3. Fix #! and make sure code works
with py3.
2017-10-11 10:27:52 -07:00
Alexander Todorov
fdb7593cb0 Rename parameters to match names that dnf uses
avoids 'Parameters differ from overridden method' warnings
2017-10-09 13:38:56 -07:00
Alexander Todorov
ac1623d9cd Don't override 'line' from outer scope 2017-10-09 13:38:56 -07:00
Brian C. Lane
9181d69098 Add mk-s360-cdboot utility (#1478448)
Add a utility to concatenate the kernel and initrd, and edit the kernel.

This is based on:
https://github.com/rhinstaller/anaconda/blob/rhel6-branch/utils/mk-s390-cdboot.c

It takes into account byteorder and it wipes the cmdline area before
writing the parmfile into the kernel.

Related: rhbz#1478448
(cherry picked from commit 6007b35096)
2017-08-14 14:29:47 -07:00
Brian C. Lane
3382a24498 Fix systemctl command (#1478247)
When multiple units are passed to systemctl and one fails it doesn't
finish the others. Change the template command to call systemctl for
each unit individually.

This also removes the lvm2-activation-generator in runtime-cleanup.tmpl
2017-08-14 14:29:47 -07:00
Brian C. Lane
e3dcb1e329 Add version output (#1335456)
Add -V to livemedia-creator, and log the running version when lorax or
lmc is started.
2017-08-14 13:54:02 -07:00
Brian C. Lane
8154b3f7a3 Include the dracut fips module in the initrd (#1341280)
This will allow anaconda to fetch kickstarts using https when installing
with fips=1

Leave vmlinuz and .vmlinuz.hmac in /boot

dracut-fips module needs the vmlinuz.hmac file in order to boot.
2017-08-14 13:20:27 -07:00
Brian C. Lane
7bc818507c Make sure loop device is setup (#1462150)
It seems that on rare occasions losetup can return before the /dev/loopX
is ready for use, causing problems with mkfs. This tries to make sure
that the loop device really is associated with the backing file before
continuing.

NOTE that using losetup --list -O to return the backing store
associated with the loop device can fail due to losetup truncating
the output filename if sysfs isn't setup. Instead of printing the full
path it will truncate it to 64 characters with a * at the end.

See util-linux lib/loopdev.c for the code that does this.

Use the existing get_loop_name function, which uses losetup -j, to lookup
the loop device associated with the backing store which should work the
same, just in the opposite direction.
2017-08-14 09:20:42 -07:00