[PATCH] meson: fix building mergetool docs

From: Phillip Wood <redacted>

Building the documentation with meson when the build directory is
not an immediate subdirectory of the source directory prints the
following error

[2/1349] Generating Documentation/mer... command (wrapped by meson to set env)
../../Documentation/generate-mergetool-list.sh: line 15: ../git-mergetool--lib.sh: No such file or directory

The build does not fail because the failure is upstream of a pipe. Fix
the error by passing the correct source directory when meson runs
"generate-mergetool-list.sh". As that script sets $MERGE_TOOLS_DIR
we do not need to set it in the environment when running the script.

Signed-off-by: Phillip Wood <redacted>
---
We should probably change the script so that error is not ignored
as well. I also wonder if we should use something more exotic than
"build" as the meson build directory in our CI though that wont make
any difference if the script does not fail.

Base-Commit: 3e0db84c88c57e70ac8be8c196dfa92c5d656fbc
Published-As: https://github.com/phillipwood/git/releases/tag/pw%2Fmeson-fix-mergetool-docs%2Fv1
View-Changes-At: https://github.com/phillipwood/git/compare/3e0db84c8...604c79018
Fetch-It-Via: git fetch https://github.com/phillipwood/git pw/meson-fix-mergetool-docs/v1

 Documentation/meson.build | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/Documentation/meson.build b/Documentation/meson.build
index f02dbc20cbc..d0e557c2078 100644
--- a/Documentation/meson.build
+++ b/Documentation/meson.build

@@ -353,13 +353,10 @@ foreach mode : [ 'diff', 'merge' ]
     command: [
       shell,
       '@INPUT@',
-      '..',
+      meson.project_source_root(),
       mode,
       '@OUTPUT@'
     ],
-    env: [
-      'MERGE_TOOLS_DIR=' + meson.project_source_root() / 'mergetools',
-    ],
     input: 'generate-mergetool-list.sh',
     output: 'mergetools-' + mode + '.adoc',
   )

-- 
2.52.0.362.g884e03848a9