git-p4: honor core.ignorecase when using P4 client specs

Perforce depot may record paths in mixed cases, e.g. "p4 files" may
show that there are these two paths:

   //depot/Path/to/file1
   //depot/pATH/to/file2

and with "p4" or "p4v", these end up in the same directory, e.g.

   //depot/Path/to/file1
   //depot/Path/to/file2

which is the desired outcome on case insensitive systems.

If git-p4 is used with client spec "//depot/Path/...", however, then
all files not matching the case in the client spec are ignored (in
the example above "//depot/pATH/to/file2").

Fix this by using the path case that appears first in lexicographical
order when core.ignorecase is set to true. This behavior is consistent
with "p4" and "p4v".

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Acked-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-p4.py

@@ -1950,10 +1950,14 @@ def update_client_spec_path_cache(self, files):
             if "unmap" in res:
                 # it will list all of them, but only one not unmap-ped
                 continue
+            if gitConfigBool("core.ignorecase"):
+                res['depotFile'] = res['depotFile'].lower()
             self.client_spec_path_cache[res['depotFile']] = self.convert_client_path(res["clientFile"])
 
         # not found files or unmap files set to ""
         for depotFile in fileArgs:
+            if gitConfigBool("core.ignorecase"):
+                depotFile = depotFile.lower()
             if depotFile not in self.client_spec_path_cache:
                 self.client_spec_path_cache[depotFile] = ""
 
@@ -1962,6 +1966,9 @@ def map_in_client(self, depot_path):
            depot file should live.  Returns "" if the file should
            not be mapped in the client."""
 
+        if gitConfigBool("core.ignorecase"):
+            depot_path = depot_path.lower()
+
         if depot_path in self.client_spec_path_cache:
             return self.client_spec_path_cache[depot_path]
 

t/t9821-git-p4-path-variations.sh

@@ -0,0 +1,200 @@
+#!/bin/sh
+
+test_description='Clone repositories with path case variations'
+
+. ./lib-git-p4.sh
+
+test_expect_success 'start p4d with case folding enabled' '
+	start_p4d -C1
+'
+
+test_expect_success 'Create a repo with path case variations' '
+	client_view "//depot/... //client/..." &&
+	(
+		cd "$cli" &&
+
+		mkdir -p Path/to &&
+		>Path/to/File2.txt &&
+		p4 add Path/to/File2.txt &&
+		p4 submit -d "Add file2" &&
+		rm -rf Path &&
+
+		mkdir -p path/TO &&
+		>path/TO/file1.txt &&
+		p4 add path/TO/file1.txt &&
+		p4 submit -d "Add file1" &&
+		rm -rf path &&
+
+		mkdir -p path/to &&
+		>path/to/file3.txt &&
+		p4 add path/to/file3.txt &&
+		p4 submit -d "Add file3" &&
+		rm -rf path &&
+
+		mkdir -p x-outside-spec &&
+		>x-outside-spec/file4.txt &&
+		p4 add x-outside-spec/file4.txt &&
+		p4 submit -d "Add file4" &&
+		rm -rf x-outside-spec
+	)
+'
+
+test_expect_success 'Clone root' '
+	client_view "//depot/... //client/..." &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		git init . &&
+		git config core.ignorecase false &&
+		git p4 clone --use-client-spec --destination="$git" //depot &&
+		# This method is used instead of "test -f" to ensure the case is
+		# checked even if the test is executed on case-insensitive file systems.
+		# All files are there as expected although the path cases look random.
+		cat >expect <<-\EOF &&
+		Path/to/File2.txt
+		path/TO/file1.txt
+		path/to/file3.txt
+		x-outside-spec/file4.txt
+		EOF
+		git ls-files >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'Clone root (ignorecase)' '
+	client_view "//depot/... //client/..." &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		git init . &&
+		git config core.ignorecase true &&
+		git p4 clone --use-client-spec --destination="$git" //depot &&
+		# This method is used instead of "test -f" to ensure the case is
+		# checked even if the test is executed on case-insensitive file systems.
+		# All files are there as expected although the path cases look random.
+		cat >expect <<-\EOF &&
+		path/TO/File2.txt
+		path/TO/file1.txt
+		path/TO/file3.txt
+		x-outside-spec/file4.txt
+		EOF
+		git ls-files >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'Clone root and ignore one file' '
+	client_view \
+		"//depot/... //client/..." \
+		"-//depot/path/TO/file1.txt //client/path/TO/file1.txt" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		git init . &&
+		git config core.ignorecase false &&
+		git p4 clone --use-client-spec --destination="$git" //depot &&
+		# We ignore one file in the client spec and all path cases change from
+		# "TO" to "to"!
+		cat >expect <<-\EOF &&
+		Path/to/File2.txt
+		path/to/file3.txt
+		x-outside-spec/file4.txt
+		EOF
+		git ls-files >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'Clone root and ignore one file (ignorecase)' '
+	client_view \
+		"//depot/... //client/..." \
+		"-//depot/path/TO/file1.txt //client/path/TO/file1.txt" &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		git init . &&
+		git config core.ignorecase true &&
+		git p4 clone --use-client-spec --destination="$git" //depot &&
+		# We ignore one file in the client spec and all path cases change from
+		# "TO" to "to"!
+		cat >expect <<-\EOF &&
+		Path/to/File2.txt
+		Path/to/file3.txt
+		x-outside-spec/file4.txt
+		EOF
+		git ls-files >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'Clone path' '
+	client_view "//depot/Path/... //client/..." &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		git init . &&
+		git config core.ignorecase false &&
+		git p4 clone --use-client-spec --destination="$git" //depot &&
+		cat >expect <<-\EOF &&
+		to/File2.txt
+		EOF
+		git ls-files >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'Clone path (ignorecase)' '
+	client_view "//depot/Path/... //client/..." &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		git init . &&
+		git config core.ignorecase true &&
+		git p4 clone --use-client-spec --destination="$git" //depot &&
+		cat >expect <<-\EOF &&
+		TO/File2.txt
+		TO/file1.txt
+		TO/file3.txt
+		EOF
+		git ls-files >actual &&
+		test_cmp expect actual
+	)
+'
+
+# It looks like P4 determines the path case based on the first file in
+# lexicographical order. Please note the lower case "to" directory for all
+# files triggered through the addition of "File0.txt".
+test_expect_success 'Add a new file and clone path with new file (ignorecase)' '
+	client_view "//depot/... //client/..." &&
+	(
+		cd "$cli" &&
+		mkdir -p Path/to &&
+		>Path/to/File0.txt &&
+		p4 add Path/to/File0.txt &&
+		p4 submit -d "Add file" &&
+		rm -rf Path
+	) &&
+
+	client_view "//depot/Path/... //client/..." &&
+	test_when_finished cleanup_git &&
+	(
+		cd "$git" &&
+		git init . &&
+		git config core.ignorecase true &&
+		git p4 clone --use-client-spec --destination="$git" //depot &&
+		cat >expect <<-\EOF &&
+		to/File0.txt
+		to/File2.txt
+		to/file1.txt
+		to/file3.txt
+		EOF
+		git ls-files >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'kill p4d' '
+	kill_p4d
+'
+
+test_done