Re: [PATCH] mergetool: use more conservative temporary filenames

4 messages, 3 authors, 2016-06-15 · open the first message on its own page

Re: [PATCH] mergetool: use more conservative temporary filenames

From: Junio C Hamano <hidden>
Date: 2016-06-15 23:02:41

David Aguilar [off-list ref] writes:
quoted hunk
Avoid filenames with multiple dots so that overly-picky tools do
not misinterpret their extension.

Previously, foo/bar.ext in the worktree would result in e.g.

	foo/bar.ext.BASE.1234.ext

This can be improved by having only a single .ext and using
underscore instead of dot so that the extension cannot be
misinterpreted.  The resulting path becomes:

	foo/bar_BASE_1234.ext

Suggested-by: Sergio Ferrero <redacted>
Signed-off-by: David Aguilar <redacted>
---
 git-mergetool.sh | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/git-mergetool.sh b/git-mergetool.sh
index 9a046b7..1f33051 100755
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -228,11 +228,15 @@ merge_file () {
 		return 1
 	fi
 
-	ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
-	BACKUP="./$MERGED.BACKUP.$ext"
-	LOCAL="./$MERGED.LOCAL.$ext"
-	REMOTE="./$MERGED.REMOTE.$ext"
-	BASE="./$MERGED.BASE.$ext"
+	ext=$(expr "$MERGED" : '.*\(\.[^/]*\)$')
+	base=$(basename "$MERGED" "$ext")
+	dir=$(dirname "$MERGED")
+	suffix="$$""$ext"
+
+	BACKUP="$dir/$base"_BACKUP_"$suffix"
+	BASE="$dir/$base"_BASE_"$suffix"
+	LOCAL="$dir/$base"_LOCAL_"$suffix"
+	REMOTE="$dir/$base"_REMOTE_"$suffix"
We used to feed "./foo/bar.ext.BASE.1234.ext"; with this patch we
feed "foo/bar_BASE_1234.ext".  

It does make this particular example look prettier, but is the
droppage of "./" intentional and is free of unintended ill side
effects?

We avoid "local" and bash-isms, so I'd prefer to see us not to
introduce new temporary variables unnecessarily.  I think we can at
least do without basename/dirname in this case, perhaps like so:

	if BASE=$(expr "$MERGED" : '\(.*\)\.[^/]*$')
        then
        	ext=$(expr "$MERGED" : '.*\(\.[^/]*\)$')
	else
        	ext= BASE=$MERGED
	fi
        BACKUP="${BASE}_BACKUP_$$$ext"
        LOCAL="${BASE}_LOCAL_$$$ext"
        REMOTE="${BASE}_REMOTE_$$$ext"
        BASE="${BASE}_BASE_$$$ext"
        
But I do not have very strong opinion either way.  I just didn't
want to have to think about the leading "./" ;-)

Re: [PATCH] mergetool: use more conservative temporary filenames

From: David Aguilar <hidden>
Date: 2016-06-15 23:02:41

On Thu, Oct 09, 2014 at 11:36:00AM -0700, Junio C Hamano wrote:
David Aguilar [off-list ref] writes:
quoted
Avoid filenames with multiple dots so that overly-picky tools do
not misinterpret their extension.

Previously, foo/bar.ext in the worktree would result in e.g.

	foo/bar.ext.BASE.1234.ext

This can be improved by having only a single .ext and using
underscore instead of dot so that the extension cannot be
misinterpreted.  The resulting path becomes:

	foo/bar_BASE_1234.ext

Suggested-by: Sergio Ferrero <redacted>
Signed-off-by: David Aguilar <redacted>
---
 git-mergetool.sh | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/git-mergetool.sh b/git-mergetool.sh
index 9a046b7..1f33051 100755
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -228,11 +228,15 @@ merge_file () {
 		return 1
 	fi
 
-	ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
-	BACKUP="./$MERGED.BACKUP.$ext"
-	LOCAL="./$MERGED.LOCAL.$ext"
-	REMOTE="./$MERGED.REMOTE.$ext"
-	BASE="./$MERGED.BASE.$ext"
+	ext=$(expr "$MERGED" : '.*\(\.[^/]*\)$')
+	base=$(basename "$MERGED" "$ext")
+	dir=$(dirname "$MERGED")
+	suffix="$$""$ext"
+
+	BACKUP="$dir/$base"_BACKUP_"$suffix"
+	BASE="$dir/$base"_BASE_"$suffix"
+	LOCAL="$dir/$base"_LOCAL_"$suffix"
+	REMOTE="$dir/$base"_REMOTE_"$suffix"
We used to feed "./foo/bar.ext.BASE.1234.ext"; with this patch we
feed "foo/bar_BASE_1234.ext".  

It does make this particular example look prettier, but is the
droppage of "./" intentional and is free of unintended ill side
effects?

We avoid "local" and bash-isms, so I'd prefer to see us not to
introduce new temporary variables unnecessarily.  I think we can at
least do without basename/dirname in this case, perhaps like so:

	if BASE=$(expr "$MERGED" : '\(.*\)\.[^/]*$')
        then
        	ext=$(expr "$MERGED" : '.*\(\.[^/]*\)$')
	else
        	ext= BASE=$MERGED
	fi
        BACKUP="${BASE}_BACKUP_$$$ext"
        LOCAL="${BASE}_LOCAL_$$$ext"
        REMOTE="${BASE}_REMOTE_$$$ext"
        BASE="${BASE}_BASE_$$$ext"
Clever ;-)
But I do not have very strong opinion either way.  I just didn't
want to have to think about the leading "./" ;-)
When I first wrote this I thought, "$(dirname foo) == '.', so it should
be okay", but it slipped my mind that $(dirname foo/bar) != "./foo" --
I like this new version better.

The leading ./ shoudln't make a difference but I also don't want
to have to think about it either.  I'll have a v2 patch shortly.
-- 
David

Re: [PATCH] mergetool: use more conservative temporary filenames

From: Charles Bailey <hidden>
Date: 2016-06-15 23:02:41

While you have the lid of this section of code, should we consider (optionally?) using a tmpdir to alleviate the eclipse issue where it wants temporary merge files to be the canonical locations for definitions of things that it finds when scanning source files in the project tree?

[Apologies for this email client's long lines.]

Re: [PATCH] mergetool: use more conservative temporary filenames

From: David Aguilar <hidden>
Date: 2016-06-15 23:02:41

On Fri, Oct 10, 2014 at 10:07:20AM +0100, Charles Bailey wrote:
While you have the lid of this section of code, should we
consider (optionally?) using a tmpdir to alleviate the eclipse
issue where it wants temporary merge files to be the canonical
locations for definitions of things that it finds when
scanning source files in the project tree?
Hiding it behind mergetool.usetmpdir seems like a good idea.

That could be a good follow-up patch.
I don't use eclipse so I wasn't aware that this is an issue.

Thanks,
-- 
David
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