[PATCH v2] meson: skip gitweb build when Perl is disabled

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It is possible to configure a Git build without Perl when disabling both
our test suite and all Perl-based features. In Meson, this can be
achieved with `meson setup -Dperl=disabled -Dtests=false`.

It was reported by a user that this breaks the Meson build because
gitweb gets built even if Perl was not discovered in such a build:

    $ meson setup .. -Dtests=false -Dperl=disabled
    ...
    ../gitweb/meson.build:2:43: ERROR: Unable to get the path of a not-found external program

Fix this issue by introducing a new feature-option that allows the user
to configure whether or not to build Gitweb. The feature is set to
'auto' by default and will be disabled automatically in case Perl was
not found on the system.

Reported-by: Daniel Engberg <daniel.engberg.lists@xxxxxxxxx>
Signed-off-by: Patrick Steinhardt <ps@xxxxxx>
---
Changes in v2:

  - Fix awkward description of the new "gitweb" option.
  - Link to v1: https://lore.kernel.org/r/20241220-b4-pks-meson-fix-gitweb-wo-perl-v1-1-41039ad8d8d4@xxxxxx

Thanks!

Patrick
---
 meson.build       | 13 +++++++++++--
 meson_options.txt |  2 ++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/meson.build b/meson.build
index 0dccebcdf16b07650d943e53643f0e09e2975cc9..8e34a895dca80da77d6809a6fe90fe7661f142a1 100644
--- a/meson.build
+++ b/meson.build
@@ -740,7 +740,7 @@ endif
 # features. It is optional if you want to neither execute tests nor use any of
 # these optional features.
 perl_required = get_option('perl')
-if get_option('tests')
+if get_option('tests') or get_option('gitweb').enabled()
   perl_required = true
 endif
 
@@ -1874,7 +1874,15 @@ if intl.found()
   subdir('po')
 endif
 subdir('contrib')
-subdir('gitweb')
+
+# Gitweb requires Perl, so we disable the auto-feature if Perl was not found.
+# We make sure further up that Perl is required in case the gitweb option is
+# enabled.
+gitweb_option = get_option('gitweb').disable_auto_if(not perl.found())
+if gitweb_option.enabled()
+  subdir('gitweb')
+endif
+
 subdir('templates')
 
 # Everything but the bin-wrappers need to come before this target such that we
@@ -1893,6 +1901,7 @@ summary({
   'curl': curl.found(),
   'expat': expat.found(),
   'gettext': intl.found(),
+  'gitweb': gitweb_option.enabled(),
   'https': https_backend,
   'iconv': iconv.found(),
   'pcre2': pcre2.found(),
diff --git a/meson_options.txt b/meson_options.txt
index 32a72139bae870745d9131cc9086a4594826be91..c374345b1a2e5bd9101fec07e9640b7726a623fb 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -23,6 +23,8 @@ option('expat', type: 'feature', value: 'enabled',
   description: 'Build helpers used to push to remotes with the HTTP transport.')
 option('gettext', type: 'feature', value: 'auto',
   description: 'Build translation files.')
+option('gitweb', type: 'feature', value: 'auto',
+  description: 'Build Git web interface. Requires Perl.')
 option('iconv', type: 'feature', value: 'auto',
   description: 'Support reencoding strings with different encodings.')
 option('pcre2', type: 'feature', value: 'enabled',

---
base-commit: d882f382b3d939d90cfa58d17b17802338f05d66
change-id: 20241218-b4-pks-meson-fix-gitweb-wo-perl-93379dd0ceed





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