git index-pack is usually run in a repository, but need not be. Since
packs don't contains information on the algorithm in use, instead
relying on context, add an option to index-pack to tell it which one
we're using in case someone runs it outside of a repository. Since
using --stdin necessarily implies a repository, don't allow specifying
an object format if it's provided to prevent users from passing an
option that won't work. Add documentation for this option.
Signed-off-by: brian m. carlson <sandals@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/git-index-pack.txt | 8 ++++++++
builtin/index-pack.c | 8 ++++++++
2 files changed, 16 insertions(+)
diff --git a/Documentation/git-index-pack.txt b/Documentation/git-index-pack.txt
index d5b7560bfe..9316d9a80b 100644
--- a/Documentation/git-index-pack.txt
+++ b/Documentation/git-index-pack.txt
@@ -93,6 +93,14 @@ OPTIONS
--max-input-size=<size>::
Die, if the pack is larger than <size>.
+--object-format=<hash-algorithm>::
+ Specify the given object format (hash algorithm) for the pack. The valid
+ values are 'sha1' and (if enabled) 'sha256'. The default is the algorithm for
+ the current repository (set by `extensions.objectFormat`), or 'sha1' if no
+ value is set or outside a repository.
++
+This option cannot be used with --stdin.
+
NOTES
-----
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 7bea1fba52..f865666db9 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -1667,6 +1667,7 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
unsigned char pack_hash[GIT_MAX_RAWSZ];
unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */
int report_end_of_input = 0;
+ int hash_algo = 0;
/*
* index-pack never needs to fetch missing objects except when
@@ -1760,6 +1761,11 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
die(_("bad %s"), arg);
} else if (skip_prefix(arg, "--max-input-size=", &arg)) {
max_input_size = strtoumax(arg, NULL, 10);
+ } else if (skip_prefix(arg, "--object-format=", &arg)) {
+ hash_algo = hash_algo_by_name(arg);
+ if (hash_algo == GIT_HASH_UNKNOWN)
+ die(_("unknown hash algorithm '%s'"), arg);
+ repo_set_hash_algo(the_repository, hash_algo);
} else
usage(index_pack_usage);
continue;
@@ -1776,6 +1782,8 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
die(_("--fix-thin cannot be used without --stdin"));
if (from_stdin && !startup_info->have_repository)
die(_("--stdin requires a git repository"));
+ if (from_stdin && hash_algo)
+ die(_("--object-format cannot be used with --stdin"));
if (!index_name && pack_name)
index_name = derive_filename(pack_name, "idx", &index_name_buf);
