Re* [PATCH] git-remote-testgit: avoid process substitution

Subsystems: the rest

2 messages, 2 authors, 2016-06-15 · open the first message on its own page

Re* [PATCH] git-remote-testgit: avoid process substitution

From: Junio C Hamano <hidden>
Date: 2016-06-15 22:57:01

Felipe Contreras [off-list ref] writes:
No, it wouldn't, but I don't think there's any way to do \<\> or \b in globs.
This should do in the meantime, but it further needs:

 - J6t's sign off for the follow-up part to remove remaining
   bash-isms to complete this patch (the last part of the patch is
   from [off-list ref] and we can take half the
   log message from there);

 - Rename it to git-remote-testgit.sh and tell Makefile to replace
   the shebang line with SHELL_PATH like other scripts;

 - Remove the "we need to have bash because we will run remote-testgit"
   logic from t5801


diff --git a/git-remote-testgit b/git-remote-testgit
index b395c8d..ffac950 100755
--- a/git-remote-testgit
+++ b/git-remote-testgit
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 # Copyright (c) 2012 Felipe Contreras
 
 alias=$1
@@ -23,7 +23,6 @@ then
 	testgitmarks="$dir/testgit.marks"
 	test -e "$gitmarks" || >"$gitmarks"
 	test -e "$testgitmarks" || >"$testgitmarks"
-	testgitmarks_args=( "--"{import,export}"-marks=$testgitmarks" )
 fi
 
 while read line
@@ -62,22 +61,31 @@ do
 			echo "feature export-marks=$gitmarks"
 		fi
 		echo "feature done"
-		git fast-export "${testgitmarks_args[@]}" $refs |
+		git fast-export \
+			${testgitmarks:+"--import-marks=$testgitmarks"} \
+			${testgitmarks:+"--export-marks=$testgitmarks"} \
+			$refs |
 		sed -e "s#refs/heads/#${prefix}/heads/#g"
 		echo "done"
 		;;
 	export)
 		before=$(git for-each-ref --format='%(refname) %(objectname)')
 
-		git fast-import "${testgitmarks_args[@]}" --quiet
-
-		after=$(git for-each-ref --format='%(refname) %(objectname)')
+		git fast-export \
+			${testgitmarks:+"--import-marks=$testgitmarks"} \
+			${testgitmarks:+"--export-marks=$testgitmarks"} \
+			--quiet
 
 		# figure out which refs were updated
-		join -e 0 -o '0 1.2 2.2' -a 2 <(echo "$before") <(echo "$after") |
-		while read ref a b
+		LF=$'\n'
+		git for-each-ref --format='%(refname) %(objectname)' |
+		while read ref a
 		do
-			test $a == $b && continue
+			case "$LF$before$LF" in
+			*"$LF$ref $a$LF"*)
+				continue
+				;;
+			esac
 			echo "ok $ref"
 		done
 

Re: Re* [PATCH] git-remote-testgit: avoid process substitution

From: Johannes Sixt <hidden>
Date: 2016-06-15 22:57:02

Am 27.04.2013 01:26, schrieb Junio C Hamano:
Felipe Contreras [off-list ref] writes:
quoted
No, it wouldn't, but I don't think there's any way to do \<\> or \b in globs.
This should do in the meantime, but it further needs:

 - J6t's sign off for the follow-up part to remove remaining
   bash-isms to complete this patch (the last part of the patch is
   from [off-list ref] and we can take half the
   log message from there);
The patch below doesn't remove the bash dependency, yet, but it addresses
the problematic mismatch you noticed without the need for $LF. Can you
please queue it to move the topic forward?

Removing the remaining bashisms and the following two can come later:
 - Rename it to git-remote-testgit.sh and tell Makefile to replace
   the shebang line with SHELL_PATH like other scripts;

 - Remove the "we need to have bash because we will run remote-testgit"
   logic from t5801
Here's my

Signed-off-by: Johannes Sixt <redacted>

for this part in case someone wants to pick it up:
quoted hunk
diff --git a/git-remote-testgit b/git-remote-testgit
index b395c8d..ffac950 100755
--- a/git-remote-testgit
+++ b/git-remote-testgit
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 # Copyright (c) 2012 Felipe Contreras
 
 alias=$1
@@ -23,7 +23,6 @@ then
 	testgitmarks="$dir/testgit.marks"
 	test -e "$gitmarks" || >"$gitmarks"
 	test -e "$testgitmarks" || >"$testgitmarks"
-	testgitmarks_args=( "--"{import,export}"-marks=$testgitmarks" )
 fi
 
 while read line
@@ -62,22 +61,31 @@ do
 			echo "feature export-marks=$gitmarks"
 		fi
 		echo "feature done"
-		git fast-export "${testgitmarks_args[@]}" $refs |
+		git fast-export \
+			${testgitmarks:+"--import-marks=$testgitmarks"} \
+			${testgitmarks:+"--export-marks=$testgitmarks"} \
+			$refs |
 		sed -e "s#refs/heads/#${prefix}/heads/#g"
 		echo "done"
 		;;
 	export)
 		before=$(git for-each-ref --format='%(refname) %(objectname)')
 
-		git fast-import "${testgitmarks_args[@]}" --quiet
+		git fast-import \
+			${testgitmarks:+"--import-marks=$testgitmarks"} \
+			${testgitmarks:+"--export-marks=$testgitmarks"} \
+			--quiet
 
--- 8< ---
Subject: [PATCH] git-remote-testgit: avoid process substitution

The implementation of bash on Windows does not offer process substitution.

Signed-off-by: Johannes Sixt <redacted>
---
 git-remote-testgit | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/git-remote-testgit b/git-remote-testgit
index 23c9d40..979b13e 100755
--- a/git-remote-testgit
+++ b/git-remote-testgit
@@ -87,17 +87,18 @@ do
 			exit 1
 		fi
 
-		before=$(git for-each-ref --format='%(refname) %(objectname)')
+		before=$(git for-each-ref --format=' %(refname) %(objectname) ')
 
 		git fast-import "${testgitmarks_args[@]}" --quiet
 
-		after=$(git for-each-ref --format='%(refname) %(objectname)')
-
 		# figure out which refs were updated
-		join -e 0 -o '0 1.2 2.2' -a 2 <(echo "$before") <(echo "$after") |
-		while read ref a b
+		git for-each-ref --format='%(refname) %(objectname)' |
+		while read ref a
 		do
-			test $a == $b && continue
+			case "$before" in
+			*" $ref $a "*)
+				continue ;;	# unchanged
+			esac
 			echo "ok $ref"
 		done
 
-- 
1.8.2.388.g36592d7
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