commit 38d18775b821d504089ef6268fc301f527ccb169
from: Omar Polo <op@omarpolo.com>
date: Fri Jul 19 19:52:46 2024 UTC

gotadmin: add flag to `init' to choose the hashing algorithm

Do the same for `got init' too obviously.  Repositories created via
`clone' are implicitly sha1 since we don't speak the v2 protocol
(yet).

ok stsp@

commit - ff129794b3e633a240763b063e8966f92f74d299
commit + 38d18775b821d504089ef6268fc301f527ccb169
blob - 0efd11eb1ea05278d857c70ca545f17de8f87588
blob + f2dbcb38ea508b565dbea5ebfbccbf5530868b1c
--- cvg/cvg.c
+++ cvg/cvg.c
@@ -1675,7 +1675,7 @@ cmd_clone(int argc, char *argv[])
 		goto done;
 
 	if (!list_refs_only) {
-		error = got_repo_init(repo_path, NULL);
+		error = got_repo_init(repo_path, NULL, GOT_HASH_SHA1);
 		if (error)
 			goto done;
 		error = got_repo_pack_fds_open(&pack_fds);
blob - 82cc6a0781f740c40e728b1018f50ffc72607f9b
blob + 8d7484c497a231b5351f541295c4fa4d6609a5e0
--- got/got.1
+++ got/got.1
@@ -75,7 +75,7 @@ The commands for
 .Nm
 are as follows:
 .Bl -tag -width checkout
-.It Cm init Oo Fl b Ar branch Oc Ar repository-path
+.It Cm init Oo Fl A Ar hashing-algorithm Oc Oo Fl b Ar branch Oc Ar repository-path
 Create a new empty repository at the specified
 .Ar repository-path .
 .Pp
@@ -108,6 +108,15 @@ The options for
 .Cm got init
 are as follows:
 .Bl -tag -width Ds
+.It Fl A Ar hashing-algorithm
+Configure the repository's
+.Ar hashing-algorithm
+used for the computation of Git object IDs.
+Possible values are
+.Cm sha1
+.Pq the default
+or
+.Cm sha256 .
 .It Fl b Ar branch
 Make the repository's HEAD reference point to the specified
 .Ar branch
blob - 3f403ec8e8aec0b1e344d07f677b0cd872cdaa28
blob + eedba272792e095dfe5a62504a47e88c579c69c8
--- got/got.c
+++ got/got.c
@@ -357,7 +357,8 @@ apply_unveil(const char *repo_path, int repo_read_only
 __dead static void
 usage_init(void)
 {
-	fprintf(stderr, "usage: %s init [-b branch] repository-path\n",
+	fprintf(stderr, "usage: %s init [-A hashing-algorithm] [-b branch]"
+	    " repository-path\n",
 	    getprogname());
 	exit(1);
 }
@@ -368,10 +369,20 @@ cmd_init(int argc, char *argv[])
 	const struct got_error *error = NULL;
 	const char *head_name = NULL;
 	char *repo_path = NULL;
+	enum got_hash_algorithm algo = GOT_HASH_SHA1;
 	int ch;
 
-	while ((ch = getopt(argc, argv, "b:")) != -1) {
+	while ((ch = getopt(argc, argv, "A:b:")) != -1) {
 		switch (ch) {
+		case 'A':
+			if (!strcmp(optarg, "sha1"))
+				algo = GOT_HASH_SHA1;
+			else if (!strcmp(optarg, "sha256"))
+				algo = GOT_HASH_SHA256;
+			else
+				return got_error_path(optarg,
+				    GOT_ERR_OBJECT_FORMAT);
+			break;
 		case 'b':
 			head_name = optarg;
 			break;
@@ -406,7 +417,7 @@ cmd_init(int argc, char *argv[])
 	if (error)
 		goto done;
 
-	error = got_repo_init(repo_path, head_name);
+	error = got_repo_init(repo_path, head_name, algo);
 done:
 	free(repo_path);
 	return error;
@@ -1765,7 +1776,7 @@ cmd_clone(int argc, char *argv[])
 		err(1, "pledge");
 #endif
 	if (!list_refs_only) {
-		error = got_repo_init(repo_path, NULL);
+		error = got_repo_init(repo_path, NULL, GOT_HASH_SHA1);
 		if (error)
 			goto done;
 		error = got_repo_pack_fds_open(&pack_fds);
blob - 00bb07ed7939d88c75f1fb6e94a7b77a86d50730
blob + d9461631d623c70a1fa3f0a27dc61e1fbc5f011a
--- gotadmin/gotadmin.1
+++ gotadmin/gotadmin.1
@@ -53,7 +53,7 @@ The commands for
 .Nm
 are as follows:
 .Bl -tag -width checkout
-.It Cm init Oo Fl b Ar branch Oc Ar repository-path
+.It Cm init Oo Fl A Ar hashing-algorithm Oc Oo Fl b Ar branch Oc Ar repository-path
 Create a new empty repository at the specified
 .Ar repository-path .
 .Pp
@@ -86,6 +86,15 @@ The options for
 .Cm gotadmin init
 are as follows:
 .Bl -tag -width Ds
+.It Fl A Ar hashing-algorithm
+Configure the repository's
+.Ar hashing-algorithm
+used for the computation of Git object IDs.
+Possible values are
+.Cm sha1
+.Pq the default
+or
+.Cm sha256 .
 .It Fl b Ar branch
 Make the repository's HEAD reference point to the specified
 .Ar branch
blob - d1a3eb16e15433fc6661b79fd57450c7752f6b39
blob + 6678a9dd097384ee9c7b2545f4a1e9211a83054d
--- gotadmin/gotadmin.c
+++ gotadmin/gotadmin.c
@@ -280,7 +280,8 @@ done:
 __dead static void
 usage_init(void)
 {
-	fprintf(stderr, "usage: %s init [-b branch] repository-path\n",
+	fprintf(stderr, "usage: %s init [-A hashing-algorithm] [-b branch]"
+	    " repository-path\n",
 	    getprogname());
 	exit(1);
 }
@@ -291,6 +292,7 @@ cmd_init(int argc, char *argv[])
 	const struct got_error *error = NULL;
 	const char *head_name = NULL;
 	char *repo_path = NULL;
+	enum got_hash_algorithm algo = GOT_HASH_SHA1;
 	int ch;
 
 #ifndef PROFILE
@@ -298,8 +300,17 @@ cmd_init(int argc, char *argv[])
 		err(1, "pledge");
 #endif
 
-	while ((ch = getopt(argc, argv, "b:")) != -1) {
+	while ((ch = getopt(argc, argv, "A:b:")) != -1) {
 		switch (ch) {
+		case 'A':
+			if (!strcmp(optarg, "sha1"))
+				algo = GOT_HASH_SHA1;
+			else if (!strcmp(optarg, "sha256"))
+				algo = GOT_HASH_SHA256;
+			else
+				return got_error_path(optarg,
+				    GOT_ERR_OBJECT_FORMAT);
+			break;
 		case 'b':
 			head_name = optarg;
 			break;
@@ -330,7 +341,7 @@ cmd_init(int argc, char *argv[])
 	if (error)
 		goto done;
 
-	error = got_repo_init(repo_path, head_name);
+	error = got_repo_init(repo_path, head_name, algo);
 done:
 	free(repo_path);
 	return error;
blob - c53bf9434590b858c1ce59018954e81ff934dfc1
blob + e4dd636f145daee8d00edb26040118dabe291813
--- include/got_repository.h
+++ include/got_repository.h
@@ -144,7 +144,8 @@ const struct got_error *got_repo_map_path(char **, str
  * Create a new repository with optional specified
  * HEAD ref in an empty directory at a specified path.
  */
-const struct got_error *got_repo_init(const char *, const char *);
+const struct got_error *got_repo_init(const char *, const char *,
+    enum got_hash_algorithm);
 
 /* Attempt to find a unique object ID for a given ID string prefix. */
 const struct got_error *got_repo_match_object_id_prefix(struct got_object_id **,
blob - d39172980ea798fa07c161a3cecc055dfc76136c
blob + f6c9b881e64ee0270d643a9dc809378060318b2b
--- lib/repository.c
+++ lib/repository.c
@@ -1723,7 +1723,8 @@ got_repo_unpin_pack(struct got_repository *repo)
 }
 
 const struct got_error *
-got_repo_init(const char *repo_path, const char *head_name)
+got_repo_init(const char *repo_path, const char *head_name,
+    enum got_hash_algorithm algo)
 {
 	const struct got_error *err = NULL;
 	const char *dirnames[] = {
@@ -1734,12 +1735,22 @@ got_repo_init(const char *repo_path, const char *head_
 	const char *description_str = "Unnamed repository; "
 	    "edit this file 'description' to name the repository.";
 	const char *headref = "ref: refs/heads/";
-	const char *gitconfig_str = "[core]\n"
+	const char *gitconfig_sha1 = "[core]\n"
 	    "\trepositoryformatversion = 0\n"
 	    "\tfilemode = true\n"
 	    "\tbare = true\n";
+	const char *gitconfig_sha256 = "[core]\n"
+	    "\trepositoryformatversion = 1\n"
+	    "\tfilemode = true\n"
+	    "\tbare = true\n"
+	    "[extensions]\n"
+	    "\tobjectformat = sha256\n";
+	const char *gitconfig = gitconfig_sha1;
 	char *headref_str, *path;
 	size_t i;
+
+	if (algo == GOT_HASH_SHA256)
+		gitconfig = gitconfig_sha256;
 
 	if (!got_path_dir_is_empty(repo_path))
 		return got_error(GOT_ERR_DIR_NOT_EMPTY);
@@ -1776,7 +1787,7 @@ got_repo_init(const char *repo_path, const char *head_
 
 	if (asprintf(&path, "%s/%s", repo_path, "config") == -1)
 		return got_error_from_errno("asprintf");
-	err = got_path_create_file(path, gitconfig_str);
+	err = got_path_create_file(path, gitconfig);
 	free(path);
 	if (err)
 		return err;