[PATCH v2 1/2] compat: add a mkstemps() compatibility function

[PATCH v2 1/2] compat: add a mkstemps() compatibility function

[David Aguilar]

mkstemps() is a BSD extension so provide an implementation
for cross-platform use.

Signed-off-by: David Aguilar <davvid@gmail.com>
---

This includes Jakub's autoconf fixups.

 Makefile          |   19 +++++++++++++
 compat/mkstemps.c |   78 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 config.mak.in     |    1 +
 configure.ac      |    6 ++++
 git-compat-util.h |    5 +++
 5 files changed, 109 insertions(+), 0 deletions(-)
 create mode 100644 compat/mkstemps.c

diff --git a/Makefile b/Makefile
index eaae45d..a70b5f0 100644
--- a/Makefile
+++ b/Makefile
@@ -52,6 +52,8 @@ all::
 #
 # Define NO_MKDTEMP if you don't have mkdtemp in the C library.
 #
+# Define NO_MKSTEMPS if you don't have mkstemps in the C library.
+#
 # Define NO_SYS_SELECT_H if you don't have sys/select.h.
 #
 # Define NO_SYMLINK_HEAD if you never want .git/HEAD to be a symbolic link.
@@ -636,10 +638,12 @@ EXTLIBS =
 
 ifeq ($(uname_S),Linux)
 	NO_STRLCPY = YesPlease
+	NO_MKSTEMPS = YesPlease
 	THREADED_DELTA_SEARCH = YesPlease
 endif
 ifeq ($(uname_S),GNU/kFreeBSD)
 	NO_STRLCPY = YesPlease
+	NO_MKSTEMPS = YesPlease
 	THREADED_DELTA_SEARCH = YesPlease
 endif
 ifeq ($(uname_S),UnixWare)
@@ -651,6 +655,7 @@ ifeq ($(uname_S),UnixWare)
 	SHELL_PATH = /usr/local/bin/bash
 	NO_IPV6 = YesPlease
 	NO_HSTRERROR = YesPlease
+	NO_MKSTEMPS = YesPlease
 	BASIC_CFLAGS += -Kthread
 	BASIC_CFLAGS += -I/usr/local/include
 	BASIC_LDFLAGS += -L/usr/local/lib
@@ -674,6 +679,7 @@ ifeq ($(uname_S),SCO_SV)
 	SHELL_PATH = /usr/bin/bash
 	NO_IPV6 = YesPlease
 	NO_HSTRERROR = YesPlease
+	NO_MKSTEMPS = YesPlease
 	BASIC_CFLAGS += -I/usr/local/include
 	BASIC_LDFLAGS += -L/usr/local/lib
 	NO_STRCASESTR = YesPlease
@@ -702,6 +708,7 @@ ifeq ($(uname_S),SunOS)
 	NO_MEMMEM = YesPlease
 	NO_HSTRERROR = YesPlease
 	NO_MKDTEMP = YesPlease
+	NO_MKSTEMPS = YesPlease
 	OLD_ICONV = UnfortunatelyYes
 	ifeq ($(uname_R),5.8)
 		NO_UNSETENV = YesPlease
@@ -724,6 +731,7 @@ ifeq ($(uname_O),Cygwin)
 	NO_D_INO_IN_DIRENT = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_MEMMEM = YesPlease
+	NO_MKSTEMPS = YesPlease
 	NO_SYMLINK_HEAD = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	NO_FAST_WORKING_DIRECTORY = UnfortunatelyYes
@@ -767,11 +775,13 @@ ifeq ($(uname_S),NetBSD)
 	BASIC_LDFLAGS += -L/usr/pkg/lib $(CC_LD_DYNPATH)/usr/pkg/lib
 	THREADED_DELTA_SEARCH = YesPlease
 	USE_ST_TIMESPEC = YesPlease
+	NO_MKSTEMPS = YesPlease
 endif
 ifeq ($(uname_S),AIX)
 	NO_STRCASESTR=YesPlease
 	NO_MEMMEM = YesPlease
 	NO_MKDTEMP = YesPlease
+	NO_MKSTEMPS = YesPlease
 	NO_STRLCPY = YesPlease
 	NO_NSEC = YesPlease
 	FREAD_READS_DIRECTORIES = UnfortunatelyYes
@@ -787,12 +797,14 @@ endif
 ifeq ($(uname_S),GNU)
 	# GNU/Hurd
 	NO_STRLCPY=YesPlease
+	NO_MKSTEMPS = YesPlease
 endif
 ifeq ($(uname_S),IRIX64)
 	NO_IPV6=YesPlease
 	NO_SETENV=YesPlease
 	NO_STRCASESTR=YesPlease
 	NO_MEMMEM = YesPlease
+	NO_MKSTEMPS = YesPlease
 	NO_STRLCPY = YesPlease
 	NO_SOCKADDR_STORAGE=YesPlease
 	SHELL_PATH=/usr/gnu/bin/bash
@@ -805,6 +817,7 @@ ifeq ($(uname_S),HP-UX)
 	NO_SETENV=YesPlease
 	NO_STRCASESTR=YesPlease
 	NO_MEMMEM = YesPlease
+	NO_MKSTEMPS = YesPlease
 	NO_STRLCPY = YesPlease
 	NO_MKDTEMP = YesPlease
 	NO_UNSETENV = YesPlease
@@ -834,6 +847,7 @@ ifneq (,$(findstring MINGW,$(uname_S)))
 	NO_C99_FORMAT = YesPlease
 	NO_STRTOUMAX = YesPlease
 	NO_MKDTEMP = YesPlease
+	NO_MKSTEMPS = YesPlease
 	SNPRINTF_RETURNS_BOGUS = YesPlease
 	NO_SVN_TESTS = YesPlease
 	NO_PERL_MAKEMAKER = YesPlease
@@ -853,6 +867,7 @@ ifneq (,$(findstring MINGW,$(uname_S)))
 endif
 ifneq (,$(findstring arm,$(uname_M)))
 	ARM_SHA1 = YesPlease
+	NO_MKSTEMPS = YesPlease
 endif
 
 -include config.mak.autogen
@@ -1011,6 +1026,10 @@ ifdef NO_MKDTEMP
 	COMPAT_CFLAGS += -DNO_MKDTEMP
 	COMPAT_OBJS += compat/mkdtemp.o
 endif
+ifdef NO_MKSTEMPS
+	COMPAT_CFLAGS += -DNO_MKSTEMPS
+	COMPAT_OBJS += compat/mkstemps.o
+endif
 ifdef NO_UNSETENV
 	COMPAT_CFLAGS += -DNO_UNSETENV
 	COMPAT_OBJS += compat/unsetenv.o
diff --git a/compat/mkstemps.c b/compat/mkstemps.c
new file mode 100644
index 0000000..10f9ed6
--- /dev/null
+++ b/compat/mkstemps.c
@@ -0,0 +1,78 @@
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#ifndef TMP_MAX
+#define TMP_MAX 16384
+#endif
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+/* Adapted from libiberty's mkstemp.c. */
+int gitmkstemps(char *pattern, int suffix_len)
+{
+	static const char letters[] =
+		"abcdefghijklmnopqrstuvwxyz"
+		"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+		"0123456789";
+	static const int num_letters = 62;
+	uint64_t value;
+	struct timeval tv;
+	char *template;
+	size_t len;
+	int fd, count;
+
+	len = strlen(pattern);
+
+	if (len < 6 + suffix_len) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (strncmp(&pattern[len - 6 - suffix_len], "XXXXXX", 6)) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	/* Replace pattern's XXXXXX characters with randomness.
+	 * Try TMP_MAX different filenames.
+	 */
+	gettimeofday(&tv, NULL);
+	value = ((size_t)(tv.tv_usec << 16)) ^ tv.tv_sec ^ getpid();
+	template = &pattern[len - 6 - suffix_len];
+	for (count = 0; count < TMP_MAX; ++count) {
+		uint64_t v = value;
+		/* Fill in the random bits. */
+		template[0] = letters[v % num_letters]; v/= num_letters;
+		template[1] = letters[v % num_letters]; v/= num_letters;
+		template[2] = letters[v % num_letters]; v/= num_letters;
+		template[3] = letters[v % num_letters]; v/= num_letters;
+		template[4] = letters[v % num_letters]; v/= num_letters;
+		template[5] = letters[v % num_letters]; v/= num_letters;
+
+		fd = open(pattern, O_BINARY|O_CREAT|O_EXCL|O_RDWR, 0600);
+		if (fd > 0)
+			return fd;
+		/* Fatal error (EPERM, ENOSPC etc).
+		 * It doesn't make sense to loop.
+		 */
+		if (errno != EEXIST)
+			break;
+		/* This is a random value.  It is only necessary that
+		 * the next TMP_MAX values generated by adding 7777 to
+		 * VALUE are different with (module 2^32).
+		 */
+		value += 7777;
+	}
+	/* We return the null string if we can't find a unique file name.  */
+	pattern[0] = '\0';
+	errno = EINVAL;
+	return -1;
+}
diff --git a/config.mak.in b/config.mak.in
index 7cce0c1..b6619af 100644
--- a/config.mak.in
+++ b/config.mak.in
@@ -46,6 +46,7 @@ NO_STRTOUMAX=@NO_STRTOUMAX@
 NO_SETENV=@NO_SETENV@
 NO_UNSETENV=@NO_UNSETENV@
 NO_MKDTEMP=@NO_MKDTEMP@
+NO_MKSTEMPS=@NO_MKSTEMPS@
 NO_ICONV=@NO_ICONV@
 OLD_ICONV=@OLD_ICONV@
 NO_DEFLATE_BOUND=@NO_DEFLATE_BOUND@
diff --git a/configure.ac b/configure.ac
index 4e728bc..95dccd4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -676,6 +676,12 @@ GIT_CHECK_FUNC(mkdtemp,
 [NO_MKDTEMP=],
 [NO_MKDTEMP=YesPlease])
 AC_SUBST(NO_MKDTEMP)
+# Define NO_MKSTEMPS if you don't have mkstemps in the C library.
+GIT_CHECK_FUNC(mkstemps,
+[NO_MKSTEMPS=],
+[NO_MKSTEMPS=YesPlease])
+AC_SUBST(NO_MKSTEMPS)
+#
 #
 # Define NO_MMAP if you want to avoid mmap.
 #
diff --git a/git-compat-util.h b/git-compat-util.h
index c7cf2d5..f7217ad 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -232,6 +232,11 @@ extern int gitsetenv(const char *, const char *, int);
 extern char *gitmkdtemp(char *);
 #endif
 
+#ifdef NO_MKSTEMPS
+#define mkstemps gitmkstemps
+extern int gitmkstemps(char *, int);
+#endif
+
 #ifdef NO_UNSETENV
 #define unsetenv gitunsetenv
 extern void gitunsetenv(const char *);
-- 
1.6.3.1.30.g55524

[PATCH v2 2/2] diff: generate prettier filenames when using GIT_EXTERNAL_DIFF

[David Aguilar]

Naturally, prep_temp_blob() did not care about filenames.
As a result, scripts that use GIT_EXTERNAL_DIFF ended up
with filenames such as ".diff_XXXXXX".

This specializes the GIT_EXTERNAL_DIFF code to generate
user-friendly filenames when creating temporary files.

Diffing "name.ext" now generates "XXXXXX_name.ext".

Signed-off-by: David Aguilar <davvid@gmail.com>
---

This includes Hannes' suggestion to avoid basename()
for Windows portability.

 cache.h                  |    2 ++
 diff.c                   |   45 +++++++++++++++++++++++++++++++++++++--------
 path.c                   |   19 +++++++++++++++++++
 t/t4020-diff-external.sh |    9 +++++++++
 4 files changed, 67 insertions(+), 8 deletions(-)

diff --git a/cache.h b/cache.h
index b8503ad..871c984 100644
--- a/cache.h
+++ b/cache.h
@@ -614,6 +614,8 @@ extern int is_empty_blob_sha1(const unsigned char *sha1);
 
 int git_mkstemp(char *path, size_t n, const char *template);
 
+int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);
+
 /*
  * NOTE NOTE NOTE!!
  *
diff --git a/diff.c b/diff.c
index dcfbcb0..60f07a0 100644
--- a/diff.c
+++ b/diff.c
@@ -1960,12 +1960,37 @@ static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
 			   void *blob,
 			   unsigned long size,
 			   const unsigned char *sha1,
-			   int mode)
+			   int mode,
+			   int pretty_filename)
 {
 	int fd;
 	struct strbuf buf = STRBUF_INIT;
 
-	fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
+	if (pretty_filename) {
+		/* Generate "XXXXXX_filename" */
+		struct strbuf pretty_name = STRBUF_INIT;
+		char *basename = ((char*)path) + strlen(path) - 1;
+
+		/* Windows lacks basename() */
+		while(*basename && basename > path) {
+			basename--;
+			if (is_dir_sep(*basename)) {
+				basename++;
+				break;
+			}
+		}
+
+		strbuf_addstr(&pretty_name, "XXXXXX_");
+		strbuf_addstr(&pretty_name, basename);
+
+		fd = git_mkstemps(temp->tmp_path, PATH_MAX,
+			pretty_name.buf, strlen(basename) + 1);
+
+		strbuf_release(&pretty_name);
+	}
+	else {
+		fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
+	}
 	if (fd < 0)
 		die("unable to create temp-file: %s", strerror(errno));
 	if (convert_to_working_tree(path,
@@ -1984,7 +2009,8 @@ static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
 }
 
 static struct diff_tempfile *prepare_temp_file(const char *name,
-		struct diff_filespec *one)
+		struct diff_filespec *one,
+		int pretty_filename)
 {
 	struct diff_tempfile *temp = claim_diff_tempfile();
 
@@ -2021,7 +2047,8 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
 				       (one->sha1_valid ?
 					one->sha1 : null_sha1),
 				       (one->sha1_valid ?
-					one->mode : S_IFLNK));
+					one->mode : S_IFLNK),
+				       pretty_filename);
 			strbuf_release(&sb);
 		}
 		else {
@@ -2045,7 +2072,7 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
 		if (diff_populate_filespec(one, 0))
 			die("cannot read data blob for %s", one->path);
 		prep_temp_blob(name, temp, one->data, one->size,
-			       one->sha1, one->mode);
+			       one->sha1, one->mode, pretty_filename);
 	}
 	return temp;
 }
@@ -2071,8 +2098,9 @@ static void run_external_diff(const char *pgm,
 	if (one && two) {
 		struct diff_tempfile *temp_one, *temp_two;
 		const char *othername = (other ? other : name);
-		temp_one = prepare_temp_file(name, one);
-		temp_two = prepare_temp_file(othername, two);
+		int pretty_filename = 1;
+		temp_one = prepare_temp_file(name, one, pretty_filename);
+		temp_two = prepare_temp_file(othername, two, pretty_filename);
 		*arg++ = pgm;
 		*arg++ = name;
 		*arg++ = temp_one->name;
@@ -3574,8 +3602,9 @@ static char *run_textconv(const char *pgm, struct diff_filespec *spec,
 	const char **arg = argv;
 	struct child_process child;
 	struct strbuf buf = STRBUF_INIT;
+	int pretty_filename = 0;
 
-	temp = prepare_temp_file(spec->path, spec);
+	temp = prepare_temp_file(spec->path, spec, pretty_filename);
 	*arg++ = pgm;
 	*arg++ = temp->name;
 	*arg = NULL;
diff --git a/path.c b/path.c
index 8a0a674..090b490 100644
--- a/path.c
+++ b/path.c
@@ -140,6 +140,25 @@ int git_mkstemp(char *path, size_t len, const char *template)
 }
 
 
+
+/* git_mkstemps() - create tmp file with suffix honoring TMPDIR variable. */
+int git_mkstemps(char *path, size_t len, const char *template, int suffix_len)
+{
+	const char *tmp;
+	size_t n;
+
+	tmp = getenv("TMPDIR");
+	if (!tmp)
+		tmp = "/tmp";
+	n = snprintf(path, len, "%s/%s", tmp, template);
+	if (len <= n) {
+		errno = ENAMETOOLONG;
+		return -1;
+	}
+	return mkstemps(path, suffix_len);
+}
+
+
 int validate_headref(const char *path)
 {
 	struct stat st;
diff --git a/t/t4020-diff-external.sh b/t/t4020-diff-external.sh
index 0720001..4ea42e0 100755
--- a/t/t4020-diff-external.sh
+++ b/t/t4020-diff-external.sh
@@ -136,6 +136,15 @@ test_expect_success 'GIT_EXTERNAL_DIFF with more than one changed files' '
 	GIT_EXTERNAL_DIFF=echo git diff
 '
 
+test_expect_success 'GIT_EXTERNAL_DIFF generates pretty paths' '
+	touch file.ext &&
+	git add file.ext &&
+	echo with extension > file.ext &&
+	GIT_EXTERNAL_DIFF=echo git diff file.ext | grep ......_file\.ext &&
+	git update-index --force-remove file.ext &&
+	rm file.ext
+'
+
 echo "#!$SHELL_PATH" >fake-diff.sh
 cat >> fake-diff.sh <<\EOF
 cat $2 >> crlfed.txt
-- 
1.6.3.1.30.g55524

Re: [PATCH v2 1/2] compat: add a mkstemps() compatibility function

[Johannes Sixt]

David Aguilar schrieb:
> +++ b/compat/mkstemps.c
> @@ -0,0 +1,78 @@
> +#include <string.h>
> +#include <errno.h>
> +#include <stdio.h>
> +#include <fcntl.h>
> +#include <inttypes.h>
> +#include <unistd.h>
> +#include <sys/time.h>
> +#include <sys/types.h>
...
> +#ifndef O_BINARY
> +#define O_BINARY 0
> +#endif
...
> +		fd = open(pattern, O_BINARY|O_CREAT|O_EXCL|O_RDWR, 0600);

You should not include "random" system headers, nor has mkstemps any
business deciding whether files are opened in binary mode. We are not
using O_BINARY anywhere else (except in compat/mingw.c). With the patch
below squashed in (I hope it won't be wrapped) you can add:

Tested-by: Johannes Sixt <j6t@kdbg.org> (Windows)

to both your patches. And, yes, I like them :-)

-- Hannes

diff --git a/compat/mkstemps.c b/compat/mkstemps.c
index 10f9ed6..1cf7f3d 100644
--- a/compat/mkstemps.c
+++ b/compat/mkstemps.c
@@ -1,20 +1,9 @@
-#include <string.h>
-#include <errno.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <inttypes.h>
-#include <unistd.h>
-#include <sys/time.h>
-#include <sys/types.h>
+#include "../git-compat-util.h"

 #ifndef TMP_MAX
 #define TMP_MAX 16384
 #endif

-#ifndef O_BINARY
-#define O_BINARY 0
-#endif
-
 /* Adapted from libiberty's mkstemp.c. */
 int gitmkstemps(char *pattern, int suffix_len)
 {
@@ -57,7 +46,7 @@ int gitmkstemps(char *pattern, int suffix_len)
 		template[4] = letters[v % num_letters]; v/= num_letters;
 		template[5] = letters[v % num_letters]; v/= num_letters;

-		fd = open(pattern, O_BINARY|O_CREAT|O_EXCL|O_RDWR, 0600);
+		fd = open(pattern, O_CREAT|O_EXCL|O_RDWR, 0600);
 		if (fd > 0)
 			return fd;
 		/* Fatal error (EPERM, ENOSPC etc).

Re: [PATCH v2 1/2] compat: add a mkstemps() compatibility function

[David Aguilar]

On Thu, May 28, 2009 at 09:07:32AM +0200, Johannes Sixt wrote:
> David Aguilar schrieb:
> 
> You should not include "random" system headers, nor has mkstemps any
> business deciding whether files are opened in binary mode. We are not
> using O_BINARY anywhere else (except in compat/mingw.c). With the patch
> below squashed in (I hope it won't be wrapped) you can add:
> 
> Tested-by: Johannes Sixt <j6t@kdbg.org> (Windows)
> 
> to both your patches. And, yes, I like them :-)
> 
> -- Hannes


Thanks.
I'll squash these in and resend 1/2 in a moment.


-- 

	David

Re: [PATCH v2 2/2] diff: generate prettier filenames when using GIT_EXTERNAL_DIFF

[Jeff King]

On Wed, May 27, 2009 at 11:11:17PM -0700, David Aguilar wrote:

> +int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);

FWIW, I find this name not very descriptive. From the name, I would
expect it to do the exact same thing as mkstemps, but be our own
personal implementation. But it is actually a wrapper that behaves
somewhat differently. So I wonder if "mkstemps_tmpdir" or something
would be a better name.

> +	if (pretty_filename) {
> +		/* Generate "XXXXXX_filename" */

Is there a reason _not_ to always just use the pretty filename? It looks
like you turn it on for external diff, but off for textconv. I don't
think there is a reason not to use it for textconv.

Is there some other code path that changes it that I'm missing?

> +		int pretty_filename = 1;
> +		temp_one = prepare_temp_file(name, one, pretty_filename);
> +		temp_two = prepare_temp_file(othername, two, pretty_filename);

I think this reads much better as just:

  temp_one = prepare_temp_file(name, one, 1);
  temp_two = prepare_temp_file(othername, two, 1);

Then it eliminates one bit of state for the reader to keep track of; I
don't have to wonder if pretty_filename might ever change. If I care
about what the '1' means, I can go look at the definition of
prepare_temp_file (or if you really want to make it more
self-documenting, make it a "flags" field and set the
USE_PRETTY_FILENAME flag).

However, I suspect that all callers should use pretty filenames, and
then this bit would just go away.

> +	int pretty_filename = 0;
>  
> -	temp = prepare_temp_file(spec->path, spec);
> +	temp = prepare_temp_file(spec->path, spec, pretty_filename);

Ditto here.

-Peff

Re: [PATCH v2 2/2] diff: generate prettier filenames when using GIT_EXTERNAL_DIFF

[David Aguilar]

On Thu, May 28, 2009 at 01:44:36PM -0400, Jeff King wrote:
> On Wed, May 27, 2009 at 11:11:17PM -0700, David Aguilar wrote:
> 
> > +int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);
> 
> FWIW, I find this name not very descriptive. From the name, I would
> expect it to do the exact same thing as mkstemps, but be our own
> personal implementation. But it is actually a wrapper that behaves
> somewhat differently. So I wonder if "mkstemps_tmpdir" or something
> would be a better name.

It does exactly what git_mkstemp() does, plus the extra
suffix_len parameter.  If we rename this function we have to
rename both.


> Is there a reason _not_ to always just use the pretty filename? It looks
> like you turn it on for external diff, but off for textconv. I don't
> think there is a reason not to use it for textconv.

I was not aware of the other code paths and only wanted to
affect the one that I knew about.  I agree that making that the
default behavior would be great, meaning we could drop the
pretty_filename flag altogether.

If you and others agree that the user-friendly names are a good
thing to have by default then I can rework patch 2/2.

> However, I suspect that all callers should use pretty filenames, and
> then this bit would just go away.

I fully agree.


-- 
		David

Re: [PATCH v2 2/2] diff: generate prettier filenames when using GIT_EXTERNAL_DIFF

[Jeff King]

On Thu, May 28, 2009 at 02:30:49PM -0700, David Aguilar wrote:

> > FWIW, I find this name not very descriptive. From the name, I would
> > expect it to do the exact same thing as mkstemps, but be our own
> > personal implementation. But it is actually a wrapper that behaves
> > somewhat differently. So I wonder if "mkstemps_tmpdir" or something
> > would be a better name.
> 
> It does exactly what git_mkstemp() does, plus the extra
> suffix_len parameter.  If we rename this function we have to
> rename both.

Ah. Well, I think that is a crappy name, too, then, but it is not your
fault. ;) So if there is precedent, I guess somebody else thought it was
a good idea, and you should leave your patch as-is.

> I was not aware of the other code paths and only wanted to
> affect the one that I knew about.  I agree that making that the
> default behavior would be great, meaning we could drop the
> pretty_filename flag altogether.
> 
> If you and others agree that the user-friendly names are a good
> thing to have by default then I can rework patch 2/2.

Switching to user-friendly temp filenames for textconv was on my todo
list, so I definitely think it is a good idea.

-Peff