From 25b763ba7a544d05fc46ad601f3f9c50a4cea8b0 Mon Sep 17 00:00:00 2001
From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 24 Aug 2015 09:12:53 -0700
Subject: [PATCH 1/5] builtin/am: introduce write_state_*() helper functions

There are many calls to write_file() that repeat the same pattern in
the implementation of the builtin version of "am".  They all share
the same traits, i.e they

 - produce a text file with a single string in it;

 - have enough information to produce the entire contents of that
   file;

 - generate the pathname of the file by making a call to am_path(); and

 - they ask write_file() to die() upon failure.

The slight differences among the call sites throw them into roughly
three categories:

 - many write either "t" or "f" based on a boolean value to a file;

 - some write the integer value in decimal text;

 - some others write more general string, e.g. an object name in
   hex, an empty string (i.e. the presense of the file itself serves
   as a flag), etc.

Introduce three helpers, write_state_bool(), write_state_count() and
write_state_text(), to reduce direct calls to write_file().

This is a preparatory step for the next step to ensure that no
"state" file this command leaves in $GIT_DIR is with an incomplete
line at the end.

Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/am.c | 68 +++++++++++++++++++++++++++++++---------------------
 1 file changed, 41 insertions(+), 27 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 634f7a7aa717e6..4d34dc5f74bf75 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -193,6 +193,27 @@ static inline const char *am_path(const struct am_state *state, const char *path
 	return mkpath("%s/%s", state->dir, path);
 }
 
+/**
+ * For convenience to call write_file()
+ */
+static int write_state_text(const struct am_state *state,
+			    const char *name, const char *string)
+{
+	return write_file(am_path(state, name), 1, "%s", string);
+}
+
+static int write_state_count(const struct am_state *state,
+			     const char *name, int value)
+{
+	return write_file(am_path(state, name), 1, "%d", value);
+}
+
+static int write_state_bool(const struct am_state *state,
+			    const char *name, int value)
+{
+	return write_state_text(state, name, value ? "t" : "f");
+}
+
 /**
  * If state->quiet is false, calls fprintf(fp, fmt, ...), and appends a newline
  * at the end.
@@ -362,7 +383,7 @@ static void write_author_script(const struct am_state *state)
 	sq_quote_buf(&sb, state->author_date);
 	strbuf_addch(&sb, '\n');
 
-	write_file(am_path(state, "author-script"), 1, "%s", sb.buf);
+	write_state_text(state, "author-script", sb.buf);
 
 	strbuf_release(&sb);
 }
@@ -1000,13 +1021,10 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 	if (state->rebasing)
 		state->threeway = 1;
 
-	write_file(am_path(state, "threeway"), 1, state->threeway ? "t" : "f");
-
-	write_file(am_path(state, "quiet"), 1, state->quiet ? "t" : "f");
-
-	write_file(am_path(state, "sign"), 1, state->signoff ? "t" : "f");
-
-	write_file(am_path(state, "utf8"), 1, state->utf8 ? "t" : "f");
+	write_state_bool(state, "threeway", state->threeway);
+	write_state_bool(state, "quiet", state->quiet);
+	write_state_bool(state, "sign", state->signoff);
+	write_state_bool(state, "utf8", state->utf8);
 
 	switch (state->keep) {
 	case KEEP_FALSE:
@@ -1022,9 +1040,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 		die("BUG: invalid value for state->keep");
 	}
 
-	write_file(am_path(state, "keep"), 1, "%s", str);
-
-	write_file(am_path(state, "messageid"), 1, state->message_id ? "t" : "f");
+	write_state_text(state, "keep", str);
+	write_state_bool(state, "messageid", state->message_id);
 
 	switch (state->scissors) {
 	case SCISSORS_UNSET:
@@ -1039,24 +1056,23 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 	default:
 		die("BUG: invalid value for state->scissors");
 	}
-
-	write_file(am_path(state, "scissors"), 1, "%s", str);
+	write_state_text(state, "scissors", str);
 
 	sq_quote_argv(&sb, state->git_apply_opts.argv, 0);
-	write_file(am_path(state, "apply-opt"), 1, "%s", sb.buf);
+	write_state_text(state, "apply-opt", sb.buf);
 
 	if (state->rebasing)
-		write_file(am_path(state, "rebasing"), 1, "%s", "");
+		write_state_text(state, "rebasing", "");
 	else
-		write_file(am_path(state, "applying"), 1, "%s", "");
+		write_state_text(state, "applying", "");
 
 	if (!get_sha1("HEAD", curr_head)) {
-		write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(curr_head));
+		write_state_text(state, "abort-safety", sha1_to_hex(curr_head));
 		if (!state->rebasing)
 			update_ref("am", "ORIG_HEAD", curr_head, NULL, 0,
 					UPDATE_REFS_DIE_ON_ERR);
 	} else {
-		write_file(am_path(state, "abort-safety"), 1, "%s", "");
+		write_state_text(state, "abort-safety", "");
 		if (!state->rebasing)
 			delete_ref("ORIG_HEAD", NULL, 0);
 	}
@@ -1066,9 +1082,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 	 * session is in progress, they should be written last.
 	 */
 
-	write_file(am_path(state, "next"), 1, "%d", state->cur);
-
-	write_file(am_path(state, "last"), 1, "%d", state->last);
+	write_state_count(state, "next", state->cur);
+	write_state_count(state, "last", state->last);
 
 	strbuf_release(&sb);
 }
@@ -1101,12 +1116,12 @@ static void am_next(struct am_state *state)
 	unlink(am_path(state, "original-commit"));
 
 	if (!get_sha1("HEAD", head))
-		write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(head));
+		write_state_text(state, "abort-safety", sha1_to_hex(head));
 	else
-		write_file(am_path(state, "abort-safety"), 1, "%s", "");
+		write_state_text(state, "abort-safety", "");
 
 	state->cur++;
-	write_file(am_path(state, "next"), 1, "%d", state->cur);
+	write_state_count(state, "next", state->cur);
 }
 
 /**
@@ -1479,8 +1494,7 @@ static int parse_mail_rebase(struct am_state *state, const char *mail)
 	write_commit_patch(state, commit);
 
 	hashcpy(state->orig_commit, commit_sha1);
-	write_file(am_path(state, "original-commit"), 1, "%s",
-			sha1_to_hex(commit_sha1));
+	write_state_text(state, "original-commit", sha1_to_hex(commit_sha1));
 
 	return 0;
 }
@@ -1782,7 +1796,7 @@ static void am_run(struct am_state *state, int resume)
 	refresh_and_write_cache();
 
 	if (index_has_changes(&sb)) {
-		write_file(am_path(state, "dirtyindex"), 1, "t");
+		write_state_bool(state, "dirtyindex", 1);
 		die(_("Dirty index: cannot apply patches (dirty: %s)"), sb.buf);
 	}
 

From 57c867efe4e005e40cfdee8a64550d7a95bbb9a0 Mon Sep 17 00:00:00 2001
From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 24 Aug 2015 09:43:41 -0700
Subject: [PATCH 2/5] builtin/am: make sure state files are text

We forgot to terminate the payload given to write_file() with LF,
resulting in files that end with an incomplete line.  Teach the
wrappers builtin/am uses to make sure it adds LF at the end as
necessary.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/am.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 4d34dc5f74bf75..f0a046bdc05fa9 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -199,13 +199,19 @@ static inline const char *am_path(const struct am_state *state, const char *path
 static int write_state_text(const struct am_state *state,
 			    const char *name, const char *string)
 {
-	return write_file(am_path(state, name), 1, "%s", string);
+	const char *fmt;
+
+	if (*string && string[strlen(string) - 1] != '\n')
+		fmt = "%s\n";
+	else
+		fmt = "%s";
+	return write_file(am_path(state, name), 1, fmt, string);
 }
 
 static int write_state_count(const struct am_state *state,
 			     const char *name, int value)
 {
-	return write_file(am_path(state, name), 1, "%d", value);
+	return write_file(am_path(state, name), 1, "%d\n", value);
 }
 
 static int write_state_bool(const struct am_state *state,

From 12d6ce1dba504dfc5279b8d24da3edb4865c2820 Mon Sep 17 00:00:00 2001
From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 24 Aug 2015 13:03:07 -0700
Subject: [PATCH 3/5] write_file(): drop "fatal" parameter

All callers except three passed 1 for the "fatal" parameter to ask
this function to die upon error, but to a casual reader of the code,
it was not all obvious what that 1 meant.  Instead, split the
function into two based on a common write_file_v() that takes the
flag, introduce write_file_gently() as a new way to attempt creating
a file without dying on error, and make three callers to call it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/am.c       |  4 ++--
 builtin/branch.c   |  2 +-
 builtin/init-db.c  |  2 +-
 builtin/worktree.c | 10 +++++-----
 cache.h            |  5 +++--
 daemon.c           |  2 +-
 setup.c            |  2 +-
 submodule.c        |  2 +-
 transport.c        |  2 +-
 wrapper.c          | 28 ++++++++++++++++++++++++----
 10 files changed, 40 insertions(+), 19 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index f0a046bdc05fa9..9c576779c36caa 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -205,13 +205,13 @@ static int write_state_text(const struct am_state *state,
 		fmt = "%s\n";
 	else
 		fmt = "%s";
-	return write_file(am_path(state, name), 1, fmt, string);
+	return write_file(am_path(state, name), fmt, string);
 }
 
 static int write_state_count(const struct am_state *state,
 			     const char *name, int value)
 {
-	return write_file(am_path(state, name), 1, "%d\n", value);
+	return write_file(am_path(state, name), "%d\n", value);
 }
 
 static int write_state_bool(const struct am_state *state,
diff --git a/builtin/branch.c b/builtin/branch.c
index 58aa84f1e85212..ff05869949b7c5 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -776,7 +776,7 @@ static int edit_branch_description(const char *branch_name)
 		    "  %s\n"
 		    "Lines starting with '%c' will be stripped.\n",
 		    branch_name, comment_line_char);
-	if (write_file(git_path(edit_description), 0, "%s", buf.buf)) {
+	if (write_file_gently(git_path(edit_description), "%s", buf.buf)) {
 		strbuf_release(&buf);
 		return error(_("could not write branch description template: %s"),
 			     strerror(errno));
diff --git a/builtin/init-db.c b/builtin/init-db.c
index 49df78d2624d58..bfe1d08234ddea 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -378,7 +378,7 @@ static void separate_git_dir(const char *git_dir)
 			die_errno(_("unable to move %s to %s"), src, git_dir);
 	}
 
-	write_file(git_link, 1, "gitdir: %s\n", git_dir);
+	write_file(git_link, "gitdir: %s\n", git_dir);
 }
 
 int init_db(const char *template_dir, unsigned int flags)
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 6a264ee749221c..368502d8371474 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -213,7 +213,7 @@ static int add_worktree(const char *path, const char **child_argv)
 	 * after the preparation is over.
 	 */
 	strbuf_addf(&sb, "%s/locked", sb_repo.buf);
-	write_file(sb.buf, 1, "initializing\n");
+	write_file(sb.buf, "initializing\n");
 
 	strbuf_addf(&sb_git, "%s/.git", path);
 	if (safe_create_leading_directories_const(sb_git.buf))
@@ -223,8 +223,8 @@ static int add_worktree(const char *path, const char **child_argv)
 
 	strbuf_reset(&sb);
 	strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
-	write_file(sb.buf, 1, "%s\n", real_path(sb_git.buf));
-	write_file(sb_git.buf, 1, "gitdir: %s/worktrees/%s\n",
+	write_file(sb.buf, "%s\n", real_path(sb_git.buf));
+	write_file(sb_git.buf, "gitdir: %s/worktrees/%s\n",
 		   real_path(get_git_common_dir()), name);
 	/*
 	 * This is to keep resolve_ref() happy. We need a valid HEAD
@@ -241,10 +241,10 @@ static int add_worktree(const char *path, const char **child_argv)
 		die(_("unable to resolve HEAD"));
 	strbuf_reset(&sb);
 	strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
-	write_file(sb.buf, 1, "%s\n", sha1_to_hex(rev));
+	write_file(sb.buf, "%s\n", sha1_to_hex(rev));
 	strbuf_reset(&sb);
 	strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
-	write_file(sb.buf, 1, "../..\n");
+	write_file(sb.buf, "../..\n");
 
 	fprintf_ln(stderr, _("Enter %s (identifier %s)"), path, name);
 
diff --git a/cache.h b/cache.h
index 6bb7119032ce95..3f79e6b61651f8 100644
--- a/cache.h
+++ b/cache.h
@@ -1539,8 +1539,9 @@ static inline ssize_t write_str_in_full(int fd, const char *str)
 {
 	return write_in_full(fd, str, strlen(str));
 }
-__attribute__((format (printf, 3, 4)))
-extern int write_file(const char *path, int fatal, const char *fmt, ...);
+
+extern int write_file(const char *path, const char *fmt, ...);
+extern int write_file_gently(const char *path, const char *fmt, ...);
 
 /* pager.c */
 extern void setup_pager(void);
diff --git a/daemon.c b/daemon.c
index d3d3e433e370e7..91545090a72e45 100644
--- a/daemon.c
+++ b/daemon.c
@@ -1376,7 +1376,7 @@ int main(int argc, char **argv)
 		sanitize_stdfds();
 
 	if (pid_file)
-		write_file(pid_file, 1, "%"PRIuMAX"\n", (uintmax_t) getpid());
+		write_file(pid_file, "%"PRIuMAX"\n", (uintmax_t) getpid());
 
 	/* prepare argv for serving-processes */
 	cld_argv = xmalloc(sizeof (char *) * (argc + 2));
diff --git a/setup.c b/setup.c
index 5f9f07dcdb059a..feb85651ef4f98 100644
--- a/setup.c
+++ b/setup.c
@@ -404,7 +404,7 @@ static void update_linked_gitdir(const char *gitfile, const char *gitdir)
 
 	strbuf_addf(&path, "%s/gitfile", gitdir);
 	if (stat(path.buf, &st) || st.st_mtime + 24 * 3600 < time(NULL))
-		write_file(path.buf, 0, "%s\n", gitfile);
+		write_file_gently(path.buf, "%s\n", gitfile);
 	strbuf_release(&path);
 }
 
diff --git a/submodule.c b/submodule.c
index 700bbf4fcb4cd9..5519f11fdb1e07 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1103,7 +1103,7 @@ void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
 
 	/* Update gitfile */
 	strbuf_addf(&file_name, "%s/.git", work_tree);
-	write_file(file_name.buf, 1, "gitdir: %s\n",
+	write_file(file_name.buf, "gitdir: %s\n",
 		   relative_path(git_dir, real_work_tree, &rel_path));
 
 	/* Update core.worktree setting */
diff --git a/transport.c b/transport.c
index 40692f8ae8aba6..025439435629ad 100644
--- a/transport.c
+++ b/transport.c
@@ -291,7 +291,7 @@ static int write_one_ref(const char *name, const struct object_id *oid,
 
 	strbuf_addstr(buf, name);
 	if (safe_create_leading_directories(buf->buf) ||
-	    write_file(buf->buf, 0, "%s\n", oid_to_hex(oid)))
+	    write_file_gently(buf->buf, "%s\n", oid_to_hex(oid)))
 		return error("problems writing temporary file %s: %s",
 			     buf->buf, strerror(errno));
 	strbuf_setlen(buf, len);
diff --git a/wrapper.c b/wrapper.c
index e4514634313c44..8c8925b72a8043 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -621,19 +621,17 @@ char *xgetcwd(void)
 	return strbuf_detach(&sb, NULL);
 }
 
-int write_file(const char *path, int fatal, const char *fmt, ...)
+static int write_file_v(const char *path, int fatal,
+			const char *fmt, va_list params)
 {
 	struct strbuf sb = STRBUF_INIT;
-	va_list params;
 	int fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0666);
 	if (fd < 0) {
 		if (fatal)
 			die_errno(_("could not open %s for writing"), path);
 		return -1;
 	}
-	va_start(params, fmt);
 	strbuf_vaddf(&sb, fmt, params);
-	va_end(params);
 	if (write_in_full(fd, sb.buf, sb.len) != sb.len) {
 		int err = errno;
 		close(fd);
@@ -652,6 +650,28 @@ int write_file(const char *path, int fatal, const char *fmt, ...)
 	return 0;
 }
 
+int write_file(const char *path, const char *fmt, ...)
+{
+	int status;
+	va_list params;
+
+	va_start(params, fmt);
+	status = write_file_v(path, 1, fmt, params);
+	va_end(params);
+	return status;
+}
+
+int write_file_gently(const char *path, const char *fmt, ...)
+{
+	int status;
+	va_list params;
+
+	va_start(params, fmt);
+	status = write_file_v(path, 0, fmt, params);
+	va_end(params);
+	return status;
+}
+
 void sleep_millisec(int millisec)
 {
 	poll(NULL, 0, millisec);

From e7ffa38c6e726e8014b76297b06f78e008deb2d0 Mon Sep 17 00:00:00 2001
From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 24 Aug 2015 09:39:48 -0700
Subject: [PATCH 4/5] write_file_v(): do not leave incomplete line at the end

All existing callers to this function use it to produce a text file
or an empty file, and a new callsite that mimick them must end their
payload with a LF.  If they forget to do so, the resulting file will
end with an incomplete line.

Teach write_file_v() to complete the incomplete line, if exists, so
that the callers do not have to.

With this, the caller-side fix in builtin/am.c becomes unnecessary.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/am.c | 10 ++--------
 wrapper.c    |  1 +
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 9c576779c36caa..486ff594d7e87d 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -199,19 +199,13 @@ static inline const char *am_path(const struct am_state *state, const char *path
 static int write_state_text(const struct am_state *state,
 			    const char *name, const char *string)
 {
-	const char *fmt;
-
-	if (*string && string[strlen(string) - 1] != '\n')
-		fmt = "%s\n";
-	else
-		fmt = "%s";
-	return write_file(am_path(state, name), fmt, string);
+	return write_file(am_path(state, name), "%s", string);
 }
 
 static int write_state_count(const struct am_state *state,
 			     const char *name, int value)
 {
-	return write_file(am_path(state, name), "%d\n", value);
+	return write_file(am_path(state, name), "%d", value);
 }
 
 static int write_state_bool(const struct am_state *state,
diff --git a/wrapper.c b/wrapper.c
index 8c8925b72a8043..0e22d4381438b2 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -632,6 +632,7 @@ static int write_file_v(const char *path, int fatal,
 		return -1;
 	}
 	strbuf_vaddf(&sb, fmt, params);
+	strbuf_complete_line(&sb);
 	if (write_in_full(fd, sb.buf, sb.len) != sb.len) {
 		int err = errno;
 		close(fd);

From 1f76a10b2d72245332ac41bd79249cb82f3946f0 Mon Sep 17 00:00:00 2001
From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 24 Aug 2015 13:20:39 -0700
Subject: [PATCH 5/5] write_file(): drop caller-supplied LF from calls to
 create a one-liner file

All of the callsites covered by this change call write_file() or
write_file_gently() to create a one-liner file.  Drop the caller
supplied LF and let these callees to append it as necessary.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/init-db.c  |  2 +-
 builtin/worktree.c | 10 +++++-----
 daemon.c           |  2 +-
 setup.c            |  2 +-
 submodule.c        |  2 +-
 transport.c        |  2 +-
 6 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/builtin/init-db.c b/builtin/init-db.c
index bfe1d08234ddea..69323e186cda73 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -378,7 +378,7 @@ static void separate_git_dir(const char *git_dir)
 			die_errno(_("unable to move %s to %s"), src, git_dir);
 	}
 
-	write_file(git_link, "gitdir: %s\n", git_dir);
+	write_file(git_link, "gitdir: %s", git_dir);
 }
 
 int init_db(const char *template_dir, unsigned int flags)
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 368502d8371474..bbb169a5d05be7 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -213,7 +213,7 @@ static int add_worktree(const char *path, const char **child_argv)
 	 * after the preparation is over.
 	 */
 	strbuf_addf(&sb, "%s/locked", sb_repo.buf);
-	write_file(sb.buf, "initializing\n");
+	write_file(sb.buf, "initializing");
 
 	strbuf_addf(&sb_git, "%s/.git", path);
 	if (safe_create_leading_directories_const(sb_git.buf))
@@ -223,8 +223,8 @@ static int add_worktree(const char *path, const char **child_argv)
 
 	strbuf_reset(&sb);
 	strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
-	write_file(sb.buf, "%s\n", real_path(sb_git.buf));
-	write_file(sb_git.buf, "gitdir: %s/worktrees/%s\n",
+	write_file(sb.buf, "%s", real_path(sb_git.buf));
+	write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
 		   real_path(get_git_common_dir()), name);
 	/*
 	 * This is to keep resolve_ref() happy. We need a valid HEAD
@@ -241,10 +241,10 @@ static int add_worktree(const char *path, const char **child_argv)
 		die(_("unable to resolve HEAD"));
 	strbuf_reset(&sb);
 	strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
-	write_file(sb.buf, "%s\n", sha1_to_hex(rev));
+	write_file(sb.buf, "%s", sha1_to_hex(rev));
 	strbuf_reset(&sb);
 	strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
-	write_file(sb.buf, "../..\n");
+	write_file(sb.buf, "../..");
 
 	fprintf_ln(stderr, _("Enter %s (identifier %s)"), path, name);
 
diff --git a/daemon.c b/daemon.c
index 91545090a72e45..f9eb296888c37c 100644
--- a/daemon.c
+++ b/daemon.c
@@ -1376,7 +1376,7 @@ int main(int argc, char **argv)
 		sanitize_stdfds();
 
 	if (pid_file)
-		write_file(pid_file, "%"PRIuMAX"\n", (uintmax_t) getpid());
+		write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
 
 	/* prepare argv for serving-processes */
 	cld_argv = xmalloc(sizeof (char *) * (argc + 2));
diff --git a/setup.c b/setup.c
index feb85651ef4f98..a206781d58d535 100644
--- a/setup.c
+++ b/setup.c
@@ -404,7 +404,7 @@ static void update_linked_gitdir(const char *gitfile, const char *gitdir)
 
 	strbuf_addf(&path, "%s/gitfile", gitdir);
 	if (stat(path.buf, &st) || st.st_mtime + 24 * 3600 < time(NULL))
-		write_file_gently(path.buf, "%s\n", gitfile);
+		write_file_gently(path.buf, "%s", gitfile);
 	strbuf_release(&path);
 }
 
diff --git a/submodule.c b/submodule.c
index 5519f11fdb1e07..4549c1baf4cb4d 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1103,7 +1103,7 @@ void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
 
 	/* Update gitfile */
 	strbuf_addf(&file_name, "%s/.git", work_tree);
-	write_file(file_name.buf, "gitdir: %s\n",
+	write_file(file_name.buf, "gitdir: %s",
 		   relative_path(git_dir, real_work_tree, &rel_path));
 
 	/* Update core.worktree setting */
diff --git a/transport.c b/transport.c
index 025439435629ad..788cf2058502fe 100644
--- a/transport.c
+++ b/transport.c
@@ -291,7 +291,7 @@ static int write_one_ref(const char *name, const struct object_id *oid,
 
 	strbuf_addstr(buf, name);
 	if (safe_create_leading_directories(buf->buf) ||
-	    write_file_gently(buf->buf, "%s\n", oid_to_hex(oid)))
+	    write_file_gently(buf->buf, "%s", oid_to_hex(oid)))
 		return error("problems writing temporary file %s: %s",
 			     buf->buf, strerror(errno));
 	strbuf_setlen(buf, len);