Add initial support for the 'tup variant' command on Windows.

On other OSes, the 'tup variant' command creates a symlink to the config
files, but since that doesn't work easily on Windows we just copy the
file instead. We have to calculate a slightly different path to make
that work, and adjust the test cases to account for the fact that the
variant won't be updated when the source config file is modified.

Author: gittup

src/tup/tup/main.c

@@ -65,7 +65,7 @@ static struct help {
 	{"refactor", "ref", "", "The refactor command can be used to help refactor Tupfiles. This will cause tup to run through the parsing phase, but not execute any commands. If any Tupfiles that are parsed result in changes to the database, these are reported as errors."},
 	{"monitor", NULL, "", "*LINUX ONLY* Starts the inotify-based file monitor. The monitor must scan the filesystem once and initialize watches on each directory. Then when you make changes to the files, the monitor will see them and write them directly into the database. With the monitor running, 'tup' does not need to do the initial scan, and can start constructing the build graph immediately."},
 	{"stop", NULL, "", "Kills the monitor if it is running."},
-	{"variant", NULL, "foo.config [bar.config] [...]", "For each argument, this command creates a variant directory with tup.config symlinked to the specified config file."},
+	{"variant", NULL, "foo.config [bar.config] [...]", "For each argument, this command creates a variant directory with tup.config symlinked (Windows: copied) to the specified config file."},
 	{"dbconfig", NULL, "", "Displays the current tup database configuration. These are internal values used by tup."},
 	{"options", NULL, "", "Displays all of the current tup options, as well as where they originated."},
 	{"graph", NULL, "[--dirs] [--ghosts] [--env] [--combine] [--stickies] [<output_1> ... <output_n>]", "Prints out a graphviz .dot format graph of the tup database to stdout. By default it only displays the parts of the graph that have changes. If you provide additional arguments, they are assumed to be files that you want to graph."},
@@ -847,11 +847,23 @@ static int create_variant(const char *config_path)
 		fprintf(stderr, "tup error: linkdest is too small to fit the tup.config symlink destination.\n");
 		return -1;
 	}
+#ifdef _WIN32
+	char srcpath[PATH_MAX];
+	if(snprintf(srcpath, sizeof(srcpath), "%s/%s", get_sub_dir(), config_path) >= (signed)sizeof(srcpath)) {
+		fprintf(stderr, "tup error: srcpath is too small to fit the tup.config source path.\n");
+		return -1;
+	}
+	if(CopyFileA(srcpath, linkdest, TRUE) == 0) {
+		fprintf(stderr, "tup error: Unable to copy the config file %s to destination: %s\n", srcpath, linkdest);
+		return -1;
+	}
+#else
 	if(symlink(linkpath, linkdest) < 0) {
 		perror(linkdest);
 		fprintf(stderr, "tup error: Unable to create tup.config symlink for config file: %s\n", config_path);
 		return -1;
 	}
+#endif
 	printf("tup: Added variant '%s' using config file '%s'\n", dirname, config_path);
 	return 0;
 }

test/t8048-tup-variants.sh

@@ -18,7 +18,6 @@
 
 # Use the 'tup variant' command to create variants from existing config files.
 . ./tup.sh
-check_no_windows tup variant
 
 mkdir configs
 
@@ -43,6 +42,9 @@ tup_object_no_exist build-default build-debug
 tup_object_no_exist build-debug build-default
 
 echo "" > configs/debug.config
+if [ "$in_windows" = "1" ]; then
+	cp configs/debug.config build-debug/tup.config
+fi
 update
 
 check_exist build-default/bar

test/t8049-tup-variants2.sh

@@ -18,7 +18,6 @@
 
 # Use the 'tup variant' command in a sub-directory.
 . ./tup.sh
-check_no_windows tup variant
 
 mkdir configs
 
@@ -45,6 +44,9 @@ tup_object_no_exist build-default build-debug
 tup_object_no_exist build-debug build-default
 
 echo "" > configs/debug.config
+if [ "$in_windows" = "1" ]; then
+	cp configs/debug.config build-debug/tup.config
+fi
 update
 
 check_exist build-default/bar

test/t8050-tup-variants3.sh

@@ -18,7 +18,6 @@
 
 # Use the 'tup variant' command when a variant directory already exists.
 . ./tup.sh
-check_no_windows tup variant
 
 mkdir build-debug
 mkdir configs
@@ -44,6 +43,9 @@ tup_object_no_exist build-default build-debug
 tup_object_no_exist build-debug build-default
 
 echo "" > configs/debug.config
+if [ "$in_windows" = "1" ]; then
+	cp configs/debug.config build-debug/tup.config
+fi
 update
 
 check_exist build-default/bar

test/t8051-tup-variants4.sh

@@ -19,7 +19,6 @@
 # Use the 'tup variant' command when a variant directory already exists and
 # is not empty..
 . ./tup.sh
-check_no_windows tup variant
 
 mkdir build-debug
 mkdir configs

test/t8052-tup-variants5.sh

@@ -18,7 +18,6 @@
 
 # Use the 'tup variant' command on config files without any suffix.
 . ./tup.sh
-check_no_windows tup variant
 
 mkdir configs
 
@@ -43,6 +42,9 @@ tup_object_no_exist build-default build-debug
 tup_object_no_exist build-debug build-default
 
 echo "" > configs/debug
+if [ "$in_windows" = "1" ]; then
+	cp configs/debug build-debug/tup.config
+fi
 update
 
 check_exist build-default/bar

test/t8053-tup-variants6.sh

@@ -19,7 +19,6 @@
 # Use the 'tup variant' command on config files further down in the
 # directory structure.
 . ./tup.sh
-check_no_windows tup variant
 
 mkdir sub
 mkdir sub/foo
@@ -48,6 +47,9 @@ tup_object_no_exist build-default build-debug
 tup_object_no_exist build-debug build-default
 
 echo "" > sub/foo/configs/debug
+if [ "$in_windows" = "1" ]; then
+	cp sub/foo/configs/debug build-debug/tup.config
+fi
 update
 
 check_exist build-default/bar

test/t8054-variant-rmrf2.sh

@@ -18,7 +18,6 @@
 
 # Try to rm -rf multiple variants.
 . ./tup.sh
-check_no_windows tup variant
 
 mkdir sub
 mkdir configs

test/t8055-variant-rmrf3.sh

@@ -19,7 +19,6 @@
 # Make sure that if we just scan the removal of a variant and re-create it, things
 # still work.
 . ./tup.sh
-check_no_windows tup variant
 
 mkdir sub
 mkdir configs

test/t8056-move-variant-monitor.sh

@@ -18,7 +18,6 @@
 
 # Move a variant directory outside of the tup hierarchy with the monitor watching.
 . ./tup.sh
-check_no_windows tup variant
 check_monitor_supported
 
 mkdir tuptest