extensions: refuse to load extensions if minimum hg version not met
As the author of several 3rd party extensions, I frequently see bug
reports from users attempting to run my extension with an old version
of Mercurial that I no longer support in my extension. Oftentimes, the
extension will import just fine. But as soon as we run extsetup(),
reposetup(), or get into the guts of a wrapped function, we encounter
an exception and abort. Today, Mercurial will print a message about
extensions that don't have a "testedwith" declaring explicit
compatibility with the current version.
The existing mechanism is a good start. But it isn't as robust as I
would like. Specifically, Mercurial assumes compatibility by default.
This means extension authors must perform compatibility checking in
their extsetup() or we wait and see if we encounter an abort at
runtime. And, compatibility checking can involve a lot of code and
lots of error checking. It's a lot of effort for extension authors.
Oftentimes, extension authors know which versions of Mercurial there
extension works on and more importantly where it is broken.
This patch introduces a magic "minimumhgversion" attribute in
extensions. When found, the extension loading mechanism will compare
the declared version against the current Mercurial version. If the
extension explicitly states we require a newer Mercurial version, a
warning is printed and the extension isn't loaded beyond importing
the Python module. This causes a graceful failure while alerting
the user of the compatibility issue.
I would be receptive to the idea of making the failure more fatal.
However, care would need to be taken to not criple every hg command.
e.g. the user may use `hg config` to fix the hgrc and if we aborted
trying to run that, the user would effectively be locked out of `hg`!
A potential future improvement to this functionality would be to catch
ImportError for the extension/module and parse the source code for
"minimumhgversion = 'XXX'" and do similar checking. This way we could
give more information about why the extension failed to load.
#require serve
#if no-outer-repo
no repo
$ hg id
abort: there is no Mercurial repository here (.hg not found)
[255]
#endif
create repo
$ hg init test
$ cd test
$ echo a > a
$ hg ci -Ama
adding a
basic id usage
$ hg id
cb9a9f314b8b tip
$ hg id --debug
cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b tip
$ hg id -q
cb9a9f314b8b
$ hg id -v
cb9a9f314b8b tip
with options
$ hg id -r.
cb9a9f314b8b tip
$ hg id -n
0
$ hg id -t
tip
$ hg id -b
default
$ hg id -i
cb9a9f314b8b
$ hg id -n -t -b -i
cb9a9f314b8b 0 default tip
with modifications
$ echo b > a
$ hg id -n -t -b -i
cb9a9f314b8b+ 0+ default tip
other local repo
$ cd ..
$ hg -R test id
cb9a9f314b8b+ tip
#if no-outer-repo
$ hg id test
cb9a9f314b8b+ tip
#endif
with remote http repo
$ cd test
$ hg serve -p $HGPORT1 -d --pid-file=hg.pid
$ cat hg.pid >> $DAEMON_PIDS
$ hg id http://localhost:$HGPORT1/
cb9a9f314b8b
remote with rev number?
$ hg id -n http://localhost:$HGPORT1/
abort: can't query remote revision number, branch, or tags
[255]
remote with tags?
$ hg id -t http://localhost:$HGPORT1/
abort: can't query remote revision number, branch, or tags
[255]
remote with branch?
$ hg id -b http://localhost:$HGPORT1/
abort: can't query remote revision number, branch, or tags
[255]
test bookmark support
$ hg bookmark Y
$ hg bookmark Z
$ hg bookmarks
Y 0:cb9a9f314b8b
* Z 0:cb9a9f314b8b
$ hg id
cb9a9f314b8b+ tip Y/Z
$ hg id --bookmarks
Y Z
test remote identify with bookmarks
$ hg id http://localhost:$HGPORT1/
cb9a9f314b8b Y/Z
$ hg id --bookmarks http://localhost:$HGPORT1/
Y Z
$ hg id -r . http://localhost:$HGPORT1/
cb9a9f314b8b Y/Z
$ hg id --bookmarks -r . http://localhost:$HGPORT1/
Y Z
test invalid lookup
$ hg id -r noNoNO http://localhost:$HGPORT1/
abort: unknown revision 'noNoNO'!
[255]
Make sure we do not obscure unknown requires file entries (issue2649)
$ echo fake >> .hg/requires
$ hg id
abort: repository requires features unknown to this Mercurial: fake!
(see https://mercurial-scm.org/wiki/MissingRequirement for more information)
[255]
$ cd ..
#if no-outer-repo
$ hg id test
abort: repository requires features unknown to this Mercurial: fake!
(see https://mercurial-scm.org/wiki/MissingRequirement for more information)
[255]
#endif