fetch-pack: refactor writing promisor file

Let's replace the 2 different pieces of code that write a
promisor file in 'builtin/repack.c' and 'fetch-pack.c'
with a new function called 'write_promisor_file()' in
'pack-write.c' and 'pack.h'.

This might also help us in the future, if we want to put
back the ref names and associated hashes that were in
the promisor files we are repacking in 'builtin/repack.c'
as suggested by a NEEDSWORK comment just above the code
we are refactoring.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

4 files changed, 20 insertions, 12 deletions

diff --git a/builtin/repack.c b/builtin/repack.c
index 279be11a16..2158b48f4c 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -14,6 +14,7 @@
 #include "object-store.h"
 #include "promisor-remote.h"
 #include "shallow.h"
+#include "pack.h"
 
 static int delta_base_offset = 1;
 static int pack_kept_objects = -1;
@@ -263,7 +264,7 @@ static void repack_promisor_objects(const struct pack_objects_args *args,
 	while (strbuf_getline_lf(&line, out) != EOF) {
 		struct string_list_item *item;
 		char *promisor_name;
-		int fd;
+
 		if (line.len != the_hash_algo->hexsz)
 			die(_("repack: Expecting full hex object ID lines only from pack-objects."));
 		item = string_list_append(names, line.buf);
@@ -281,10 +282,7 @@ static void repack_promisor_objects(const struct pack_objects_args *args,
 		 */
 		promisor_name = mkpathdup("%s-%s.promisor", packtmp,
 					  line.buf);
-		fd = open(promisor_name, O_CREAT|O_EXCL|O_WRONLY, 0600);
-		if (fd < 0)
-			die_errno(_("unable to create '%s'"), promisor_name);
-		close(fd);
+		write_promisor_file(promisor_name, NULL, 0);
 
 		item->util = (void *)(uintptr_t)populate_pack_exts(item->string);
 
diff --git a/fetch-pack.c b/fetch-pack.c
index c5fa4992a6..1eaedcb5dc 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -777,8 +777,6 @@ static void create_promisor_file(const char *keep_name,
 {
 	struct strbuf promisor_name = STRBUF_INIT;
 	int suffix_stripped;
-	FILE *output;
-	int i;
 
 	strbuf_addstr(&promisor_name, keep_name);
 	suffix_stripped = strbuf_strip_suffix(&promisor_name, ".keep");
@@ -787,11 +785,7 @@ static void create_promisor_file(const char *keep_name,
 		    keep_name);
 	strbuf_addstr(&promisor_name, ".promisor");
 
-	output = xfopen(promisor_name.buf, "w");
-	for (i = 0; i < nr_sought; i++)
-		fprintf(output, "%s %s\n", oid_to_hex(&sought[i]->old_oid),
-			sought[i]->name);
-	fclose(output);
+	write_promisor_file(promisor_name.buf, sought, nr_sought);
 
 	strbuf_release(&promisor_name);
 }
diff --git a/pack-write.c b/pack-write.c
index 3513665e1e..db3ff9980f 100644
--- a/pack-write.c
+++ b/pack-write.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "pack.h"
 #include "csum-file.h"
+#include "remote.h"
 
 void reset_pack_idx_option(struct pack_idx_option *opts)
 {
@@ -367,3 +368,14 @@ void finish_tmp_packfile(struct strbuf *name_buffer,
 
 	free((void *)idx_tmp_name);
 }
+
+void write_promisor_file(const char *promisor_name, struct ref **sought, int nr_sought)
+{
+	int i;
+	FILE *output = xfopen(promisor_name, "w");
+
+	for (i = 0; i < nr_sought; i++)
+		fprintf(output, "%s %s\n", oid_to_hex(&sought[i]->old_oid),
+			sought[i]->name);
+	fclose(output);
+}
diff --git a/pack.h b/pack.h
index 9fc0945ac9..9ae640f417 100644
--- a/pack.h
+++ b/pack.h
@@ -87,6 +87,10 @@ off_t write_pack_header(struct hashfile *f, uint32_t);
 void fixup_pack_header_footer(int, unsigned char *, const char *, uint32_t, unsigned char *, off_t);
 char *index_pack_lockfile(int fd);
 
+struct ref;
+
+void write_promisor_file(const char *promisor_name, struct ref **sought, int nr_sought);
+
 /*
  * The "hdr" output buffer should be at least this big, which will handle sizes
  * up to 2^67.