aria2 @1.37.0_4+docs: can't read "python.version": no such variable

[ShadSterling (Shad Sterling)]

Isolating just the docs variant with port clean aria2; port install aria2 -cares+docs-gnutls-openssl-sqlite3-universal fails:

--->  Cleaning aria2
--->  Computing dependencies for aria2
--->  Fetching archive for aria2
--->  Attempting to fetch aria2-1.37.0_4+docs.darwin_22.x86_64.tbz2 from https://packages.macports.org/aria2
--->  Attempting to fetch aria2-1.37.0_4+docs.darwin_22.x86_64.tbz2 from https://ywg.ca.packages.macports.org/mirror/macports/packages/aria2
--->  Attempting to fetch aria2-1.37.0_4+docs.darwin_22.x86_64.tbz2 from http://mirror.fcix.net/macports/packages/aria2
--->  Fetching distfiles for aria2
--->  Verifying checksums for aria2
--->  Extracting aria2
--->  Applying patches to aria2
--->  Configuring aria2
Error: Failed to configure aria2: can't read "python.version": no such variable
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_net_aria2/aria2/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.
Error: Processing of port aria2 failed

[Schamschula (Marius Schamschula)]

I cannot reproduce this error.

I have the identical Portfile in my local tree. I just ran sudo port -v destroot aria2 +docs: No errors.

python.version is set at the beginning of the docs variant block.

[ShadSterling (Shad Sterling)]

Log from destroot rather than install

[ShadSterling (Shad Sterling)]

destroot gives me the same error as install. If the log doesn't show why, where else would the reason show up? Is there a trace option that will show python.version being set?

[jmroot (Joshua Root)]

Since python.version is not a pre-existing global variable when the variant runs, you have to declare it global or it will go out of scope at the end of the variant block. The pre-configure code is of course saved and run later as a separate procedure.

[jmroot (Joshua Root)]

But of course the bigger problem is that building a port should not require the user to use port select.

[ryandesign (Ryan Carsten Schmidt)]

Also the +docs variant only adds dependencies. It doesn't do anything to ensure that docs won't be built if the +docs variant isn't selected but those dependencies happen already to be installed.

[Schamschula (Marius Schamschula)]

Indeed, having to run port select is not desirable.

This issue had bugged me for quite some time.

Hopefully, both issues are now fixed.

[Marius Schamschula <mschamschula@…>]

In 0c049338d4d1bc62ca7818f53db2f87cc361de6b/macports-ports (master):

aria2: don't opornistically build man page

Don't require port select sphinx
Closes: #69563