The idea is to be able to advertize a new revision of the same version
of GIMP. For instance, this would apply when we release a
`gimp-2-10-14-setup-3.exe` Windows installer (then we are at revision
3, provided we started at revision 0).
The revision number is obviously only relevant to a given platform and
version. Also the concept of build ID allows to differentiate various
builds for a same platform, in particular to not look at revisions of
third-party builds. The build ID can be any string. Maybe we could just
use reverse DNS build id (such as "org.gimp.GIMP_official") to identify
the official GIMP build. So in the end, we only compare revisions for an
identical (version, platform, build-id) tuple.
Allows to disable the automatic update check at startup. I believe some
packagers will want such options, in particular on Linux distribution
(where they control their own release schedule and won't want GIMP to
pop new version warning up because they have been slow to update their
package).
Note that it is still possible to query version checks manually in the
about dialog, but the automatic check/popup is gone with this option.
- Clear the GError when relevant.
- Check result of json_path_compile() just in case.
- Print some error on stderr when parsing of gimp_versions.json fails
(which should never happen on releases but would help during
development).
Instead of storing versions as objects, we now store them as arrays,
because json arrays are ordered, unlike objects (the website was using
non-standard Python extension to consider the version objects ordered
but this is not proper and even more, the lib we use for GIMP does not
have a similar extension.
This simplifies a bit the code as we don't need to order the versions by
comparing their string representations.
When an update is available, a big frame is visible, proposing to go to
the download page. Now a button is also available to explicitly request
for an update check in other cases (bypassing the wait delay for a
future startup).
First, let's make the check happen at each startup on unstable (still
once a week on stable).
Second, make it parse gimp.org's gimp_versions.json on stable, but
testing's one on unstable and also check environment variable
GIMP_DEV_VERSIONS_JSON (unstable only) to allow setting a local path
(allowing to tweak the file and test various cases).
Unrelated to testing, some improvements:
- save a timestamp in seconds (really no need to keep microseconds
precision here).
- just in case, check that the saved timestamp is not in the future.
This fixes the following warning when compiling with Mingw:
> warning: integer overflow in expression of type 'long int' results in '-694967296' [-Woverflow]
GIMP will now process the remote gimp_versions json file to look if one
is using the last version of GIMP. This initial code doesn't act up yet
on this information. This will come in further commits.
Here are the characteristics:
- Since this requires internet access, a new checkbox is available in
the Preferences dialog, allowing to disable version checks. Note that
it is enabled by default as it is an important security feature, but
it has to be deactivatable.
- The remote access is done as an async operation because we don't want
it to block the startup in any way (for whatever reason). Also it
doesn't output errors if it fails to not be a bother (you don't
technically need internet access for an image program).
- We don't check at every startup. At each successful check, we save a
timestamp to prevent too frequent useless checks (I set it the timer
to a week or more for now).
Jehan