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-rw-r--r--Master/texmf-dist/scripts/l3build/l3build-install.lua8
1 files changed, 8 insertions, 0 deletions
diff --git a/Master/texmf-dist/scripts/l3build/l3build-install.lua b/Master/texmf-dist/scripts/l3build/l3build-install.lua
index baea5a9a425..64d29fc5904 100644
--- a/Master/texmf-dist/scripts/l3build/l3build-install.lua
+++ b/Master/texmf-dist/scripts/l3build/l3build-install.lua
@@ -327,9 +327,17 @@ function install_files(target,full,dry_run)
if errorlevel ~= 0 then return errorlevel end
+ -- Track created destination directories to avoid overhead from
+ -- repeatedly creating them
+ local destination_dirs = {}
+
-- Files are all copied in one shot: this ensures that cleandir()
-- can't be an issue even if there are complex set-ups
for _,v in ipairs(installmap) do
+ if not destination_dirs[v.dest] then
+ mkdir(v.dest)
+ destination_dirs[v.dest] = true
+ end
errorlevel = cp(v.file,v.source,v.dest)
if errorlevel ~= 0 then return errorlevel end
end