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fix: allow multiple copy_file in the same package #324

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fix: allow multiple copy_file in the same package #324

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8 changes: 7 additions & 1 deletion rules/private/copy_file_private.bzl
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Original file line number Diff line number Diff line change
Expand Up @@ -19,13 +19,19 @@ cmd.exe (on Windows). '_copy_xfile' marks the resulting file executable,
'_copy_file' does not.
"""

def _hash_file(file):
return str(hash(file.path))

def copy_cmd(ctx, src, dst):
# Most Windows binaries built with MSVC use a certain argument quoting
# scheme. Bazel uses that scheme too to quote arguments. However,
# cmd.exe uses different semantics, so Bazel's quoting is wrong here.
# To fix that we write the command to a .bat file so no command line
# quoting or escaping is required.
bat = ctx.actions.declare_file(ctx.label.name + "-cmd.bat")
# Put a hash of the file name into the name of the generated batch file to
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note: users of the public API wouldn't observe a problem because only one declare_file happens per copy_file rule, and so ctx.label.name is sufficient to disambiguate.

We hit this in a scenario where a rule uses this library code and creates multiple actions.

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note: users of the public API wouldn't observe a problem because only one declare_file happens per copy_file rule, and so ctx.label.name is sufficient to disambiguate.

We hit this in a scenario where a rule uses this library code and creates multiple actions.

# make it unique within the package, so that users can define multiple copy_file's.
bat = ctx.actions.declare_file("%s-%s-cmd.bat" % (ctx.label.name, _hash_file(src)))

ctx.actions.write(
output = bat,
# Do not use lib/shell.bzl's shell.quote() method, because that uses
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