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Remove destination before copying file 

If there's a symlink as the destination to one of these macros,
currently we'll write to the destination of that symlink instead of
overwriting the symlink. We've run into this a few times when a module
is added to replace a symlink that used to exist via
LOCAL_POST_INSTALL_CMD. These have required manual discovery, and
additions to CleanSpec.mk files:
http://android-review.googlesource.com/143334

Use `rm -f` for single-file targets to remove the destination before
copying. On Linux, `cp --remove-destination` can work, but is not
supported by Darwin or acp.

There may still be problems with dependencies when symlinks are
involved, since ninja will use the destination of the symlink to check
whether it is up to date. But at least with this change, if any
dependency gets regenerated, we'll properly reset the file.

Change-Id: I6d3ac0bd9ced5e21a0ff9dad0eaff012a7bc9c75
This commit is contained in:
Dan Willemsen 2016-02-29 12:45:18 -08:00
parent b044f082e6
commit 3545eeb6c1
1 changed files with 10 additions and 4 deletions
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14
core/definitions.mk
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@ -2404,19 +2404,22 @@ endef
# Therefore copy-file-to-target is the same as copy-file-to-new-target.
define copy-file-to-target
@mkdir -p $(dir $@)
$(hide) $(ACP) -fp $< $@
$(hide) rm -f $@
$(hide) $(ACP) -p $< $@
endef
# The same as copy-file-to-target, but use the local
# cp command instead of acp.
define copy-file-to-target-with-cp
@mkdir -p $(dir $@)
$(hide) cp -fp $< $@
$(hide) rm -f $@
$(hide) cp -p $< $@
endef
# The same as copy-file-to-target, but use the zipalign tool to do so.
define copy-file-to-target-with-zipalign
@mkdir -p $(dir $@)
$(hide) rm -f $@
$(hide) $(ZIPALIGN) -f 4 $< $@
endef
@ -2424,6 +2427,7 @@ endef
# comments (for config files and such).
define copy-file-to-target-strip-comments
@mkdir -p $(dir $@)
$(hide) rm -f $@
$(hide) sed -e 's/#.*$$//' -e 's/[ \t]*$$//' -e '/^$$/d' < $< > $@
endef
@ -2431,14 +2435,16 @@ endef
# the old modification time.
define copy-file-to-new-target
@mkdir -p $(dir $@)
$(hide) $(ACP) -fp $< $@
$(hide) rm -f $@
$(hide) $(ACP) -p $< $@
endef
# The same as copy-file-to-new-target, but use the local
# cp command instead of acp.
define copy-file-to-new-target-with-cp
@mkdir -p $(dir $@)
$(hide) cp -f $< $@
$(hide) rm -f $@
$(hide) cp $< $@
endef
# Copy a prebuilt file to a target location.