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-rw-r--r--builtin/am.c2
-rw-r--r--builtin/checkout.c2
-rw-r--r--builtin/diff.c2
-rw-r--r--builtin/pull.c2
-rw-r--r--cache.h12
-rw-r--r--diff-lib.c2
-rw-r--r--hash.h57
-rw-r--r--merge-recursive.c2
-rw-r--r--notes-merge.c2
-rw-r--r--repository.c9
-rw-r--r--repository.h5
-rw-r--r--sequencer.c6
-rw-r--r--setup.c49
-rw-r--r--sha1_file.c58
-rw-r--r--submodule.c2
15 files changed, 175 insertions, 37 deletions
diff --git a/builtin/am.c b/builtin/am.c
index 02853b3e05..3d98e52085 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1433,7 +1433,7 @@ static void write_index_patch(const struct am_state *state)
if (!get_oid_tree("HEAD", &head))
tree = lookup_tree(&head);
else
- tree = lookup_tree(&empty_tree_oid);
+ tree = lookup_tree(the_hash_algo->empty_tree);
fp = xfopen(am_path(state, "patch"), "w");
init_revisions(&rev_info, NULL);
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 3faae382de..e1e157d205 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -514,7 +514,7 @@ static int merge_working_tree(const struct checkout_opts *opts,
}
tree = parse_tree_indirect(old->commit ?
&old->commit->object.oid :
- &empty_tree_oid);
+ the_hash_algo->empty_tree);
init_tree_desc(&trees[0], tree->buffer, tree->size);
tree = parse_tree_indirect(&new->commit->object.oid);
init_tree_desc(&trees[1], tree->buffer, tree->size);
diff --git a/builtin/diff.c b/builtin/diff.c
index 9808d062a8..16bfb22f73 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -379,7 +379,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
add_head_to_pending(&rev);
if (!rev.pending.nr) {
struct tree *tree;
- tree = lookup_tree(&empty_tree_oid);
+ tree = lookup_tree(the_hash_algo->empty_tree);
add_pending_object(&rev, &tree->object, "HEAD");
}
break;
diff --git a/builtin/pull.c b/builtin/pull.c
index 166b777ed6..511dbbe0f6 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -557,7 +557,7 @@ static int pull_into_void(const struct object_id *merge_head,
* index/worktree changes that the user already made on the unborn
* branch.
*/
- if (checkout_fast_forward(&empty_tree_oid, merge_head, 0))
+ if (checkout_fast_forward(the_hash_algo->empty_tree, merge_head, 0))
return 1;
if (update_ref("initial pull", "HEAD", merge_head, curr_head, 0, UPDATE_REFS_DIE_ON_ERR))
diff --git a/cache.h b/cache.h
index cb5db7bf83..d3e240228c 100644
--- a/cache.h
+++ b/cache.h
@@ -14,6 +14,7 @@
#include "hash.h"
#include "path.h"
#include "sha1-array.h"
+#include "repository.h"
#ifndef platform_SHA_CTX
/*
@@ -77,6 +78,8 @@ struct object_id {
unsigned char hash[GIT_MAX_RAWSZ];
};
+#define the_hash_algo the_repository->hash_algo
+
#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
#define DTYPE(de) ((de)->d_type)
#else
@@ -907,6 +910,7 @@ struct repository_format {
int version;
int precious_objects;
int is_bare;
+ int hash_algo;
char *work_tree;
struct string_list unknown_extensions;
};
@@ -1039,22 +1043,22 @@ extern const struct object_id empty_blob_oid;
static inline int is_empty_blob_sha1(const unsigned char *sha1)
{
- return !hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);
+ return !hashcmp(sha1, the_hash_algo->empty_blob->hash);
}
static inline int is_empty_blob_oid(const struct object_id *oid)
{
- return !hashcmp(oid->hash, EMPTY_BLOB_SHA1_BIN);
+ return !oidcmp(oid, the_hash_algo->empty_blob);
}
static inline int is_empty_tree_sha1(const unsigned char *sha1)
{
- return !hashcmp(sha1, EMPTY_TREE_SHA1_BIN);
+ return !hashcmp(sha1, the_hash_algo->empty_tree->hash);
}
static inline int is_empty_tree_oid(const struct object_id *oid)
{
- return !hashcmp(oid->hash, EMPTY_TREE_SHA1_BIN);
+ return !oidcmp(oid, the_hash_algo->empty_tree);
}
/* set default permissions by passing mode arguments to open(2) */
diff --git a/diff-lib.c b/diff-lib.c
index 5173023cd3..8104603a3b 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -218,7 +218,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
} else if (revs->diffopt.ita_invisible_in_index &&
ce_intent_to_add(ce)) {
diff_addremove(&revs->diffopt, '+', ce->ce_mode,
- &empty_tree_oid, 0,
+ the_hash_algo->empty_tree, 0,
ce->name, 0);
continue;
}
diff --git a/hash.h b/hash.h
index 024d0d3d50..7d7a864f5d 100644
--- a/hash.h
+++ b/hash.h
@@ -1,6 +1,8 @@
#ifndef HASH_H
#define HASH_H
+#include "git-compat-util.h"
+
#if defined(SHA1_PPC)
#include "ppc/sha1.h"
#elif defined(SHA1_APPLE)
@@ -13,4 +15,59 @@
#include "block-sha1/sha1.h"
#endif
+/*
+ * Note that these constants are suitable for indexing the hash_algos array and
+ * comparing against each other, but are otherwise arbitrary, so they should not
+ * be exposed to the user or serialized to disk. To know whether a
+ * git_hash_algo struct points to some usable hash function, test the format_id
+ * field for being non-zero. Use the name field for user-visible situations and
+ * the format_id field for fixed-length fields on disk.
+ */
+/* An unknown hash function. */
+#define GIT_HASH_UNKNOWN 0
+/* SHA-1 */
+#define GIT_HASH_SHA1 1
+/* Number of algorithms supported (including unknown). */
+#define GIT_HASH_NALGOS (GIT_HASH_SHA1 + 1)
+
+typedef void (*git_hash_init_fn)(void *ctx);
+typedef void (*git_hash_update_fn)(void *ctx, const void *in, size_t len);
+typedef void (*git_hash_final_fn)(unsigned char *hash, void *ctx);
+
+struct git_hash_algo {
+ /*
+ * The name of the algorithm, as appears in the config file and in
+ * messages.
+ */
+ const char *name;
+
+ /* A four-byte version identifier, used in pack indices. */
+ uint32_t format_id;
+
+ /* The size of a hash context (e.g. git_SHA_CTX). */
+ size_t ctxsz;
+
+ /* The length of the hash in binary. */
+ size_t rawsz;
+
+ /* The length of the hash in hex characters. */
+ size_t hexsz;
+
+ /* The hash initialization function. */
+ git_hash_init_fn init_fn;
+
+ /* The hash update function. */
+ git_hash_update_fn update_fn;
+
+ /* The hash finalization function. */
+ git_hash_final_fn final_fn;
+
+ /* The OID of the empty tree. */
+ const struct object_id *empty_tree;
+
+ /* The OID of the empty blob. */
+ const struct object_id *empty_blob;
+};
+extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS];
+
#endif
diff --git a/merge-recursive.c b/merge-recursive.c
index d00b274381..a4c280dfc7 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -2082,7 +2082,7 @@ int merge_recursive(struct merge_options *o,
/* if there is no common ancestor, use an empty tree */
struct tree *tree;
- tree = lookup_tree(&empty_tree_oid);
+ tree = lookup_tree(the_hash_algo->empty_tree);
merged_common_ancestors = make_virtual_commit(tree, "ancestor");
}
diff --git a/notes-merge.c b/notes-merge.c
index 4a83b0ebd5..0f6573cb17 100644
--- a/notes-merge.c
+++ b/notes-merge.c
@@ -595,7 +595,7 @@ int notes_merge(struct notes_merge_options *o,
bases = get_merge_bases(local, remote);
if (!bases) {
base_oid = &null_oid;
- base_tree_oid = &empty_tree_oid;
+ base_tree_oid = the_hash_algo->empty_tree;
if (o->verbosity >= 4)
printf("No merge base found; doing history-less merge\n");
} else if (!bases->next) {
diff --git a/repository.c b/repository.c
index bb2fae5446..998413b8bb 100644
--- a/repository.c
+++ b/repository.c
@@ -5,7 +5,7 @@
/* The main repository */
static struct repository the_repo = {
- NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &the_index, 0, 0
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &the_index, NULL, 0, 0
};
struct repository *the_repository = &the_repo;
@@ -64,6 +64,11 @@ void repo_set_gitdir(struct repository *repo, const char *path)
free(old_gitdir);
}
+void repo_set_hash_algo(struct repository *repo, int hash_algo)
+{
+ repo->hash_algo = &hash_algos[hash_algo];
+}
+
/*
* Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
* Return 0 upon success and a non-zero value upon failure.
@@ -136,6 +141,8 @@ int repo_init(struct repository *repo, const char *gitdir, const char *worktree)
if (read_and_verify_repository_format(&format, repo->commondir))
goto error;
+ repo_set_hash_algo(repo, format.hash_algo);
+
if (worktree)
repo_set_worktree(repo, worktree);
diff --git a/repository.h b/repository.h
index 7f5e24a0a2..0329e40c7f 100644
--- a/repository.h
+++ b/repository.h
@@ -4,6 +4,7 @@
struct config_set;
struct index_state;
struct submodule_cache;
+struct git_hash_algo;
struct repository {
/* Environment */
@@ -67,6 +68,9 @@ struct repository {
*/
struct index_state *index;
+ /* Repository's current hash algorithm, as serialized on disk. */
+ const struct git_hash_algo *hash_algo;
+
/* Configurations */
/*
* Bit used during initialization to indicate if repository state (like
@@ -86,6 +90,7 @@ extern struct repository *the_repository;
extern void repo_set_gitdir(struct repository *repo, const char *path);
extern void repo_set_worktree(struct repository *repo, const char *path);
+extern void repo_set_hash_algo(struct repository *repo, int algo);
extern int repo_init(struct repository *repo, const char *gitdir, const char *worktree);
extern int repo_submodule_init(struct repository *submodule,
struct repository *superproject,
diff --git a/sequencer.c b/sequencer.c
index fa94ed652d..e90bc316bb 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -347,7 +347,7 @@ static int read_oneliner(struct strbuf *buf,
static struct tree *empty_tree(void)
{
- return lookup_tree(&empty_tree_oid);
+ return lookup_tree(the_hash_algo->empty_tree);
}
static int error_dirty_index(struct replay_opts *opts)
@@ -706,7 +706,7 @@ static int is_original_commit_empty(struct commit *commit)
oid_to_hex(&parent->object.oid));
ptree_oid = &parent->tree->object.oid;
} else {
- ptree_oid = &empty_tree_oid; /* commit is root */
+ ptree_oid = the_hash_algo->empty_tree; /* commit is root */
}
return !oidcmp(ptree_oid, &commit->tree->object.oid);
@@ -959,7 +959,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
} else {
unborn = get_oid("HEAD", &head);
if (unborn)
- oidcpy(&head, &empty_tree_oid);
+ oidcpy(&head, the_hash_algo->empty_tree);
if (index_differs_from(unborn ? EMPTY_TREE_SHA1_HEX : "HEAD",
NULL, 0))
return error_dirty_index(opts);
diff --git a/setup.c b/setup.c
index 94768512b7..50c6b2ab11 100644
--- a/setup.c
+++ b/setup.c
@@ -434,16 +434,15 @@ static int check_repo_format(const char *var, const char *value, void *vdata)
return 0;
}
-static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
+static int check_repository_format_gently(const char *gitdir, struct repository_format *candidate, int *nongit_ok)
{
struct strbuf sb = STRBUF_INIT;
struct strbuf err = STRBUF_INIT;
- struct repository_format candidate;
int has_common;
has_common = get_common_dir(&sb, gitdir);
strbuf_addstr(&sb, "/config");
- read_repository_format(&candidate, sb.buf);
+ read_repository_format(candidate, sb.buf);
strbuf_release(&sb);
/*
@@ -451,10 +450,10 @@ static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
* we treat a missing config as a silent "ok", even when nongit_ok
* is unset.
*/
- if (candidate.version < 0)
+ if (candidate->version < 0)
return 0;
- if (verify_repository_format(&candidate, &err) < 0) {
+ if (verify_repository_format(candidate, &err) < 0) {
if (nongit_ok) {
warning("%s", err.buf);
strbuf_release(&err);
@@ -464,21 +463,21 @@ static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
die("%s", err.buf);
}
- repository_format_precious_objects = candidate.precious_objects;
- string_list_clear(&candidate.unknown_extensions, 0);
+ repository_format_precious_objects = candidate->precious_objects;
+ string_list_clear(&candidate->unknown_extensions, 0);
if (!has_common) {
- if (candidate.is_bare != -1) {
- is_bare_repository_cfg = candidate.is_bare;
+ if (candidate->is_bare != -1) {
+ is_bare_repository_cfg = candidate->is_bare;
if (is_bare_repository_cfg == 1)
inside_work_tree = -1;
}
- if (candidate.work_tree) {
+ if (candidate->work_tree) {
free(git_work_tree_cfg);
- git_work_tree_cfg = candidate.work_tree;
+ git_work_tree_cfg = candidate->work_tree;
inside_work_tree = -1;
}
} else {
- free(candidate.work_tree);
+ free(candidate->work_tree);
}
return 0;
@@ -489,6 +488,7 @@ int read_repository_format(struct repository_format *format, const char *path)
memset(format, 0, sizeof(*format));
format->version = -1;
format->is_bare = -1;
+ format->hash_algo = GIT_HASH_SHA1;
string_list_init(&format->unknown_extensions, 1);
git_config_from_file(check_repo_format, path, format);
return format->version;
@@ -625,6 +625,7 @@ cleanup_return:
static const char *setup_explicit_git_dir(const char *gitdirenv,
struct strbuf *cwd,
+ struct repository_format *repo_fmt,
int *nongit_ok)
{
const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
@@ -650,7 +651,7 @@ static const char *setup_explicit_git_dir(const char *gitdirenv,
die("Not a git repository: '%s'", gitdirenv);
}
- if (check_repository_format_gently(gitdirenv, nongit_ok)) {
+ if (check_repository_format_gently(gitdirenv, repo_fmt, nongit_ok)) {
free(gitfile);
return NULL;
}
@@ -723,9 +724,10 @@ static const char *setup_explicit_git_dir(const char *gitdirenv,
static const char *setup_discovered_git_dir(const char *gitdir,
struct strbuf *cwd, int offset,
+ struct repository_format *repo_fmt,
int *nongit_ok)
{
- if (check_repository_format_gently(gitdir, nongit_ok))
+ if (check_repository_format_gently(gitdir, repo_fmt, nongit_ok))
return NULL;
/* --work-tree is set without --git-dir; use discovered one */
@@ -737,7 +739,7 @@ static const char *setup_discovered_git_dir(const char *gitdir,
gitdir = to_free = real_pathdup(gitdir, 1);
if (chdir(cwd->buf))
die_errno("Could not come back to cwd");
- ret = setup_explicit_git_dir(gitdir, cwd, nongit_ok);
+ ret = setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok);
free(to_free);
return ret;
}
@@ -769,11 +771,12 @@ static const char *setup_discovered_git_dir(const char *gitdir,
/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
+ struct repository_format *repo_fmt,
int *nongit_ok)
{
int root_len;
- if (check_repository_format_gently(".", nongit_ok))
+ if (check_repository_format_gently(".", repo_fmt, nongit_ok))
return NULL;
setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
@@ -785,7 +788,7 @@ static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
if (chdir(cwd->buf))
die_errno("Could not come back to cwd");
- return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
+ return setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok);
}
inside_git_dir = 1;
@@ -1026,6 +1029,7 @@ const char *setup_git_directory_gently(int *nongit_ok)
static struct strbuf cwd = STRBUF_INIT;
struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
const char *prefix;
+ struct repository_format repo_fmt;
/*
* We may have read an incomplete configuration before
@@ -1053,18 +1057,18 @@ const char *setup_git_directory_gently(int *nongit_ok)
prefix = NULL;
break;
case GIT_DIR_EXPLICIT:
- prefix = setup_explicit_git_dir(gitdir.buf, &cwd, nongit_ok);
+ prefix = setup_explicit_git_dir(gitdir.buf, &cwd, &repo_fmt, nongit_ok);
break;
case GIT_DIR_DISCOVERED:
if (dir.len < cwd.len && chdir(dir.buf))
die(_("Cannot change to '%s'"), dir.buf);
prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
- nongit_ok);
+ &repo_fmt, nongit_ok);
break;
case GIT_DIR_BARE:
if (dir.len < cwd.len && chdir(dir.buf))
die(_("Cannot change to '%s'"), dir.buf);
- prefix = setup_bare_git_dir(&cwd, dir.len, nongit_ok);
+ prefix = setup_bare_git_dir(&cwd, dir.len, &repo_fmt, nongit_ok);
break;
case GIT_DIR_HIT_CEILING:
prefix = setup_nongit(cwd.buf, nongit_ok);
@@ -1110,6 +1114,8 @@ const char *setup_git_directory_gently(int *nongit_ok)
repo_set_gitdir(the_repository, gitdir);
setup_git_env();
}
+ if (startup_info->have_repository)
+ repo_set_hash_algo(the_repository, repo_fmt.hash_algo);
}
strbuf_release(&dir);
@@ -1171,7 +1177,8 @@ int git_config_perm(const char *var, const char *value)
void check_repository_format(void)
{
- check_repository_format_gently(get_git_dir(), NULL);
+ struct repository_format repo_fmt;
+ check_repository_format_gently(get_git_dir(), &repo_fmt, NULL);
startup_info->have_repository = 1;
}
diff --git a/sha1_file.c b/sha1_file.c
index afe4b90f6e..b44f5247ca 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -39,6 +39,64 @@ const struct object_id empty_blob_oid = {
EMPTY_BLOB_SHA1_BIN_LITERAL
};
+static void git_hash_sha1_init(void *ctx)
+{
+ git_SHA1_Init((git_SHA_CTX *)ctx);
+}
+
+static void git_hash_sha1_update(void *ctx, const void *data, size_t len)
+{
+ git_SHA1_Update((git_SHA_CTX *)ctx, data, len);
+}
+
+static void git_hash_sha1_final(unsigned char *hash, void *ctx)
+{
+ git_SHA1_Final(hash, (git_SHA_CTX *)ctx);
+}
+
+static void git_hash_unknown_init(void *ctx)
+{
+ die("trying to init unknown hash");
+}
+
+static void git_hash_unknown_update(void *ctx, const void *data, size_t len)
+{
+ die("trying to update unknown hash");
+}
+
+static void git_hash_unknown_final(unsigned char *hash, void *ctx)
+{
+ die("trying to finalize unknown hash");
+}
+
+const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
+ {
+ NULL,
+ 0x00000000,
+ 0,
+ 0,
+ 0,
+ git_hash_unknown_init,
+ git_hash_unknown_update,
+ git_hash_unknown_final,
+ NULL,
+ NULL,
+ },
+ {
+ "sha-1",
+ /* "sha1", big-endian */
+ 0x73686131,
+ sizeof(git_SHA_CTX),
+ GIT_SHA1_RAWSZ,
+ GIT_SHA1_HEXSZ,
+ git_hash_sha1_init,
+ git_hash_sha1_update,
+ git_hash_sha1_final,
+ &empty_tree_oid,
+ &empty_blob_oid,
+ },
+};
+
/*
* This is meant to hold a *small* number of objects that you would
* want read_sha1_file() to be able to return, but yet you do not want
diff --git a/submodule.c b/submodule.c
index 95e6aff2bb..fa25888783 100644
--- a/submodule.c
+++ b/submodule.c
@@ -587,7 +587,7 @@ void show_submodule_inline_diff(struct diff_options *o, const char *path,
struct object_id *one, struct object_id *two,
unsigned dirty_submodule)
{
- const struct object_id *old = &empty_tree_oid, *new = &empty_tree_oid;
+ const struct object_id *old = the_hash_algo->empty_tree, *new = the_hash_algo->empty_tree;
struct commit *left = NULL, *right = NULL;
struct commit_list *merge_bases = NULL;
struct child_process cp = CHILD_PROCESS_INIT;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 21:48:44 +0000