environment: add global variable to disable replacement

This new "read_replace_refs" global variable is set to 1 by
default, so that replace refs are used by default. But
reachability traversal and packing commands ("cmd_fsck",
"cmd_prune", "cmd_pack_objects", "upload_pack",
"cmd_unpack_objects") set it to 0, as they must work with the
original DAG.

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

diff --git a/builtin-fsck.c b/builtin-fsck.c
index 7da706c..bc05de6 100644 (file)
--- a/builtin-fsck.c
+++ b/builtin-fsck.c
@@ -589,6 +589,7 @@ int cmd_fsck(int argc, const char **argv, const char *prefix)
        struct alternate_object_database *alt;
 
        errors_found = 0;
+       read_replace_refs = 0;
 
        argc = parse_options(argc, argv, prefix, fsck_opts, fsck_usage, 0);
        if (write_lost_and_found) {

diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index 9742b45..b2c93d3 100644 (file)
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -2103,6 +2103,8 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
        int rp_ac_alloc = 64;
        int rp_ac;
 
+       read_replace_refs = 0;
+
        rp_av = xcalloc(rp_ac_alloc, sizeof(*rp_av));
 
        rp_av[0] = "pack-objects";

diff --git a/builtin-prune.c b/builtin-prune.c
index 0ed9cce..8459aec 100644 (file)
--- a/builtin-prune.c
+++ b/builtin-prune.c
@@ -140,6 +140,7 @@ int cmd_prune(int argc, const char **argv, const char *prefix)
        char *s;
 
        save_commit_buffer = 0;
+       read_replace_refs = 0;
        init_revisions(&revs, prefix);
 
        argc = parse_options(argc, argv, prefix, options, prune_usage, 0);

diff --git a/builtin-unpack-objects.c b/builtin-unpack-objects.c
index 9a77323..c9f5ac0 100644 (file)
--- a/builtin-unpack-objects.c
+++ b/builtin-unpack-objects.c
@@ -495,6 +495,8 @@ int cmd_unpack_objects(int argc, const char **argv, const char *prefix)
        int i;
        unsigned char sha1[20];
 
+       read_replace_refs = 0;
+
        git_config(git_default_config, NULL);
 
        quiet = !isatty(2);

diff --git a/cache.h b/cache.h
index 94b1228..91ef340 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -516,6 +516,7 @@ extern size_t packed_git_window_size;
 extern size_t packed_git_limit;
 extern size_t delta_base_cache_limit;
 extern int auto_crlf;
+extern int read_replace_refs;
 extern int fsync_object_files;
 extern int core_preload_index;
 

diff --git a/environment.c b/environment.c
index 801a005..6d90074 100644 (file)
--- a/environment.c
+++ b/environment.c
@@ -38,6 +38,7 @@ int pager_use_color = 1;
 const char *editor_program;
 const char *excludes_file;
 int auto_crlf = 0;     /* 1: both ways, -1: only when adding git objects */
+int read_replace_refs = 1;
 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;

diff --git a/replace_object.c b/replace_object.c
index b23e1cd..eb59604 100644 (file)
--- a/replace_object.c
+++ b/replace_object.c
@@ -94,6 +94,9 @@ const unsigned char *lookup_replace_object(const unsigned char *sha1)
        int pos, depth = MAXREPLACEDEPTH;
        const unsigned char *cur = sha1;
 
+       if (!read_replace_refs)
+               return sha1;
+
        prepare_replace_object();
 
        /* Try to recursively replace the object */

diff --git a/t/t6050-replace.sh b/t/t6050-replace.sh
index 334aed6..17f6063 100755 (executable)
--- a/t/t6050-replace.sh
+++ b/t/t6050-replace.sh
@@ -82,6 +82,29 @@ test_expect_success 'tag replaced commit' '
      git mktag <tag.sig >.git/refs/tags/mytag 2>message
 '
 
+test_expect_success '"git fsck" works' '
+     git fsck master > fsck_master.out &&
+     grep "dangling commit $R" fsck_master.out &&
+     grep "dangling tag $(cat .git/refs/tags/mytag)" fsck_master.out &&
+     test -z "$(git fsck)"
+'
+
+test_expect_success 'repack, clone and fetch work' '
+     git repack -a -d &&
+     git clone --no-hardlinks . clone_dir &&
+     cd clone_dir &&
+     git show HEAD~5 | grep "A U Thor" &&
+     git show $HASH2 | grep "A U Thor" &&
+     git cat-file commit $R &&
+     git repack -a -d &&
+     test_must_fail git cat-file commit $R &&
+     git fetch ../ "refs/replace/*:refs/replace/*" &&
+     git show HEAD~5 | grep "O Thor" &&
+     git show $HASH2 | grep "O Thor" &&
+     git cat-file commit $R &&
+     cd ..
+'
+
 #
 #
 test_done

diff --git a/upload-pack.c b/upload-pack.c
index edc7861..e6c4f34 100644 (file)
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -618,6 +618,7 @@ int main(int argc, char **argv)
        int strict = 0;
 
        git_extract_argv0_path(argv[0]);
+       read_replace_refs = 0;
 
        for (i = 1; i < argc; i++) {
                char *arg = argv[i];