Change merge-cache and git-merge-one-file to use the SHA1 of the file

instead of a checked-out temporary copy.

If merging requires a checked-out-copy, we now do so with "unpack-file".

diff --git a/git-merge-one-file-script b/git-merge-one-file-script
index 26dbe63..df1a679 100755 (executable)
--- a/git-merge-one-file-script
+++ b/git-merge-one-file-script
@@ -2,34 +2,50 @@
 #
 # This is the git merge script, called with
 #
-#   $1 - original file (or empty string)
-#   $2 - file in branch1 (or empty string)
-#   $3 - file in branch2 (or empty string)
+#   $1 - original file SHA1 (or empty)
+#   $2 - file in branch1 SHA1 (or empty)
+#   $3 - file in branch2 SHA1 (or empty)
 #   $4 - pathname in repository
 #
 #
-# Case 1: file removed in both
+# Handle some trivial cases.. The _really_ trivial cases have
+# been handled already by read-tree, but that one doesn't
+# do any merges that migth change the tree layout
 #
-if [ -z "$2$3" ]; then
-       rm -- "$4"
-       update-cache --remove -- "$4"
-       exit 0
-fi
+
+case "${1:-.}${2:-.}${3:-.}" in
 #
-# Case 2: file exists in just one
+# deleted in both, or deleted in one and unchanged in the other
 #
-if [ "$2$3" == "$3$2" ]; then
-       cat "$2$3" > "$4"
-       update-cache --add -- "$4"
+"$1.." | "$1.$1" | "$1$1.")
+       rm -f -- "$4"
+       update-cache --remove -- "$4"
        exit 0
-fi
+       ;;
+
 #
-# Case 3: file exists in both
+# added in one, or added identically in both
 #
-src="$1"
-if [ -z "$1" ]; then
-       src=/dev/null
-fi     
-echo "Auto-merging $4"
-cp "$3" "$4"
-merge "$4" "$src" "$2" && update-cache --add -- "$4"
+".$2." | "..$3" | ".$2$2")
+       mv $(unpack-file "${2:-$3}") $4
+       update-cache --add -- $4
+       exit 0
+       ;;
+
+#
+# Modified in both, but differently ;(
+#
+"$1$2$3")
+       echo "Auto-merging $4"
+       orig=$(unpack-file $1)
+       src1=$(unpack-file $2)
+       src2=$(unpack-file $3)
+       merge "$src2" "$orig" "$src1" || echo Leaving conflict merge in $src2 && exit 1
+       cp "$src2" "$4" && update-cache --add -- "$4" && exit 0
+       ;;
+
+*)
+       echo "Not handling case $1 -> $2 -> $3"
+       ;;
+esac
+exit 1

diff --git a/merge-cache.c b/merge-cache.c
index 3aa391b..68ac4ab 100644 (file)
--- a/merge-cache.c
+++ b/merge-cache.c
@@ -25,29 +25,6 @@ static void run_program(void)
                die("merge program failed");
 }
 
-static char *create_temp_file(int stage, unsigned char *sha1)
-{
-       static char template[4][50];
-       char *path = template[stage];
-       void *buf;
-       char type[100];
-       unsigned long size;
-       int fd;
-
-       buf = read_sha1_file(sha1, type, &size);
-       if (!buf || strcmp(type, "blob"))
-               die("unable to read blob object %s", sha1_to_hex(sha1));
-
-       strcpy(path, ".merge_file_XXXXXX");
-       fd = mkstemp(path);
-       if (fd < 0)
-               die("unable to create temp-file");
-       if (write(fd, buf, size) != size)
-               die("unable to write temp-file");
-       close(fd);
-       return path;
-}
-
 static int merge_entry(int pos, const char *path)
 {
        int found;
@@ -61,13 +38,15 @@ static int merge_entry(int pos, const char *path)
        arguments[4] = path;
        found = 0;
        do {
+               static char hexbuf[4][60];
                struct cache_entry *ce = active_cache[pos];
                int stage = ce_stage(ce);
 
                if (strcmp(ce->name, path))
                        break;
                found++;
-               arguments[stage] = create_temp_file(stage, ce->sha1);
+               strcpy(hexbuf[stage], sha1_to_hex(ce->sha1));
+               arguments[stage] = hexbuf[stage];
        } while (++pos < active_nr);
        if (!found)
                die("merge-cache: %s not in the cache", path);