[PATCH v2 2/8] rm: support the --pathspec-from-file option

From: Alexandr Miloslavskiy via GitGitGadget <gitgitgadget@gmail.com>
Date: Feb 10, 2020, 14:45 UTC
Message-ID: <7ccbab52e51423a9ba74c0cab77448ceabb9dcdc.1581345948.git.gitgitgadget@gmail.com>
In-Reply-To: <pull.530.v2.git.1581345948.gitgitgadget@gmail.com>

From: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>

Decisions taken for simplicity:
1) It is not allowed to pass pathspec in both args and file.

`if (!argc)` block was adapted to work with --pathspec-from-file. For that, I also had to parse pathspec earlier. Now it happens before `read_cache()` / `hold_locked_index()` / `setup_work_tree()`, which sounds fine to me.

In case of empty pathspec, there is now a clear error message instead of showing usage. As a consequence, exit code has also changed. Judging from [1] it doesn't seem that showing usage in this case was important (according to commit message, it was to avoid segfault), and it doesn't fit into how other commands react to empty pathspec. Finally, the new error message is easier to understand.

[1] Commit 7612a1ef ("git-rm: honor -n flag" 2006-06-09)

Signed-off-by: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>
---
 Documentation/git-rm.txt    | 17 +++++++-
 builtin/rm.c                | 28 ++++++++++---
 t/t3601-rm-pathspec-file.sh | 79 +++++++++++++++++++++++++++++++++++++
 3 files changed, 117 insertions(+), 7 deletions(-)
 create mode 100755 t/t3601-rm-pathspec-file.sh

diff --git a/Documentation/git-rm.txt b/Documentation/git-rm.txt
index e02a08e5ef..ab750367fd 100644
--- a/Documentation/git-rm.txt
+++ b/Documentation/git-rm.txt
@@ -8,7 +8,9 @@ git-rm - Remove files from the working tree and from the index
 SYNOPSIS
 --------
 [verse]
-'git rm' [-f | --force] [-n] [-r] [--cached] [--ignore-unmatch] [--quiet] [--] <pathspec>...
+'git rm' [-f | --force] [-n] [-r] [--cached] [--ignore-unmatch]
+	  [--quiet] [--pathspec-from-file=<file> [--pathspec-file-nul]]
+	  [--] [<pathspec>...]
 
 DESCRIPTION
 -----------
@@ -73,6 +75,19 @@ For more details, see the 'pathspec' entry in linkgit:gitglossary[7].
 	`git rm` normally outputs one line (in the form of an `rm` command)
 	for each file removed. This option suppresses that output.
 
+--pathspec-from-file=<file>::
+	Pathspec is passed in `<file>` instead of commandline args. If
+	`<file>` is exactly `-` then standard input is used. Pathspec
+	elements are separated by LF or CR/LF. Pathspec elements can be
+	quoted as explained for the configuration variable `core.quotePath`
+	(see linkgit:git-config[1]). See also `--pathspec-file-nul` and
+	global `--literal-pathspecs`.
+
+--pathspec-file-nul::
+	Only meaningful with `--pathspec-from-file`. Pathspec elements are
+	separated with NUL character and all other characters are taken
+	literally (including newlines and quotes).
+
 
 REMOVING FILES THAT HAVE DISAPPEARED FROM THE FILESYSTEM
 --------------------------------------------------------
diff --git a/builtin/rm.c b/builtin/rm.c
index 19ce95a901..4858631e0f 100644
--- a/builtin/rm.c
+++ b/builtin/rm.c
@@ -235,7 +235,8 @@ static int check_local_mod(struct object_id *head, int index_only)
 }
 
 static int show_only = 0, force = 0, index_only = 0, recursive = 0, quiet = 0;
-static int ignore_unmatch = 0;
+static int ignore_unmatch = 0, pathspec_file_nul;
+static char *pathspec_from_file;
 
 static struct option builtin_rm_options[] = {
 	OPT__DRY_RUN(&show_only, N_("dry run")),
@@ -245,6 +246,8 @@ static struct option builtin_rm_options[] = {
 	OPT_BOOL('r', NULL,             &recursive,  N_("allow recursive removal")),
 	OPT_BOOL( 0 , "ignore-unmatch", &ignore_unmatch,
 				N_("exit with a zero status even if nothing matched")),
+	OPT_PATHSPEC_FROM_FILE(&pathspec_from_file),
+	OPT_PATHSPEC_FILE_NUL(&pathspec_file_nul),
 	OPT_END(),
 };
 
@@ -259,8 +262,24 @@ int cmd_rm(int argc, const char **argv, const char *prefix)
 
 	argc = parse_options(argc, argv, prefix, builtin_rm_options,
 			     builtin_rm_usage, 0);
-	if (!argc)
-		usage_with_options(builtin_rm_usage, builtin_rm_options);
+
+	parse_pathspec(&pathspec, 0,
+		       PATHSPEC_PREFER_CWD,
+		       prefix, argv);
+
+	if (pathspec_from_file) {
+		if (pathspec.nr)
+			die(_("--pathspec-from-file is incompatible with pathspec arguments"));
+
+		parse_pathspec_file(&pathspec, 0,
+				    PATHSPEC_PREFER_CWD,
+				    prefix, pathspec_from_file, pathspec_file_nul);
+	} else if (pathspec_file_nul) {
+		die(_("--pathspec-file-nul requires --pathspec-from-file"));
+	}
+
+	if (!pathspec.nr)
+		die(_("No pathspec was given. Which files should I remove?"));
 
 	if (!index_only)
 		setup_work_tree();
@@ -270,9 +289,6 @@ int cmd_rm(int argc, const char **argv, const char *prefix)
 	if (read_cache() < 0)
 		die(_("index file corrupt"));
 
-	parse_pathspec(&pathspec, 0,
-		       PATHSPEC_PREFER_CWD,
-		       prefix, argv);
 	refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, &pathspec, NULL, NULL);
 
 	seen = xcalloc(pathspec.nr, 1);
diff --git a/t/t3601-rm-pathspec-file.sh b/t/t3601-rm-pathspec-file.sh
new file mode 100755
index 0000000000..4542a0f02f
--- /dev/null
+++ b/t/t3601-rm-pathspec-file.sh
@@ -0,0 +1,79 @@
+#!/bin/sh
+
+test_description='rm --pathspec-from-file'
+
+. ./test-lib.sh
+
+test_tick
+
+test_expect_success setup '
+	echo A >fileA.t &&
+	echo B >fileB.t &&
+	echo C >fileC.t &&
+	echo D >fileD.t &&
+	git add fileA.t fileB.t fileC.t fileD.t &&
+	git commit -m "files" &&
+	
+	git tag checkpoint
+'
+
+restore_checkpoint () {
+	git reset --hard checkpoint
+}
+
+verify_expect () {
+	git status --porcelain --untracked-files=no -- fileA.t fileB.t fileC.t fileD.t >actual &&
+	test_cmp expect actual
+}
+
+test_expect_success 'simplest' '
+	restore_checkpoint &&
+
+	cat >expect <<-\EOF &&
+	D  fileA.t
+	EOF
+
+	echo fileA.t | git rm --pathspec-from-file=- &&
+	verify_expect
+'
+
+test_expect_success '--pathspec-file-nul' '
+	restore_checkpoint &&
+
+	cat >expect <<-\EOF &&
+	D  fileA.t
+	D  fileB.t
+	EOF
+
+	printf "fileA.t\0fileB.t\0" | git rm --pathspec-from-file=- --pathspec-file-nul &&
+	verify_expect
+'
+
+test_expect_success 'only touches what was listed' '
+	restore_checkpoint &&
+
+	cat >expect <<-\EOF &&
+	D  fileB.t
+	D  fileC.t
+	EOF
+
+	printf "fileB.t\nfileC.t\n" | git rm --pathspec-from-file=- &&
+	verify_expect
+'
+
+test_expect_success 'error conditions' '
+	restore_checkpoint &&
+	echo fileA.t >list &&
+
+	test_must_fail git rm --pathspec-from-file=list -- fileA.t 2>err &&
+	test_i18ngrep -e "--pathspec-from-file is incompatible with pathspec arguments" err &&
+
+	test_must_fail git rm --pathspec-file-nul 2>err &&
+	test_i18ngrep -e "--pathspec-file-nul requires --pathspec-from-file" err &&
+	
+	>empty_list &&
+	test_must_fail git rm --pathspec-from-file=empty_list 2>err &&
+	test_i18ngrep -e "No pathspec was given. Which files should I remove?" err
+'
+
+test_done

-- 
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