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Make the name of a pack-file depend on the objects packed there-in.

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This means that the .git/objects/pack directory is also rsync'able,
since the filenames created there-in are either unique or refer to the
same data.

Otherwise you might not be able to pull from a directory that is partly
packed without having to worry about missing objects due to pack-file
name clashes.
This commit is contained in:
Linus Torvalds 2005-07-03 15:34:04 -07:00
parent 2396ec85bd
commit 5f3de58ff8
2 changed files with 20 additions and 17 deletions
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17
git-repack-script
View File

@ -1,18 +1,13 @@
#!/bin/sh
: ${GIT_DIR=.git}
: ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
packname=$(date +"pack-%s")
if [ -f "$GIT_OBJECT_DIRECTORY/pack/$packname.idx" ]; then
echo Pack $packname already exists
rm -f .tmp-pack-*
packname=$(git-rev-list --unpacked --objects $(git-rev-parse --all) |
git-pack-objects --non-empty --incremental .tmp-pack) ||
exit 1
fi
rm -f $packname.idx $packname.pack
git-rev-list --unpacked --objects $(git-rev-parse --all) |
git-pack-objects --non-empty --incremental $packname ||
exit 1
if [ ! -f $packname.idx ]; then
if [ -z "$packname" ]; then
echo Nothing new to pack
exit 0
fi
mv $packname.idx $packname.pack "$GIT_OBJECT_DIRECTORY/pack/"
mv .tmp-pack-$packname.pack "$GIT_OBJECT_DIRECTORY/pack/pack-$packname.pack"
mv .tmp-pack-$packname.idx "$GIT_OBJECT_DIRECTORY/pack/pack-$packname.idx"

20
pack-objects.c
View File

@ -18,6 +18,7 @@ struct object_entry {
struct object_entry *delta;
};
static unsigned char object_list_sha1[20];
static int non_empty = 0;
static int incremental = 0;
static struct object_entry **sorted_by_sha, **sorted_by_type;
@ -135,7 +136,7 @@ static void write_pack_file(void)
if (!base_name)
f = sha1fd(1, "<stdout>");
else
f = sha1create("%s.%s", base_name, "pack");
f = sha1create("%s-%s.%s", base_name, sha1_to_hex(object_list_sha1), "pack");
hdr.hdr_signature = htonl(PACK_SIGNATURE);
hdr.hdr_version = htonl(PACK_VERSION);
hdr.hdr_entries = htonl(nr_objects);
@ -152,7 +153,7 @@ static void write_pack_file(void)
static void write_index_file(void)
{
int i;
struct sha1file *f = sha1create("%s.%s", base_name, "idx");
struct sha1file *f = sha1create("%s-%s.%s", base_name, sha1_to_hex(object_list_sha1), "idx");
struct object_entry **list = sorted_by_sha;
struct object_entry **last = list + nr_objects;
unsigned int array[256];
@ -189,13 +190,13 @@ static void write_index_file(void)
sha1close(f, NULL, 1);
}
static void add_object_entry(unsigned char *sha1, unsigned int hash)
static int add_object_entry(unsigned char *sha1, unsigned int hash)
{
unsigned int idx = nr_objects;
struct object_entry *entry;
if (incremental && has_sha1_pack(sha1))
return;
return 0;
if (idx >= nr_alloc) {
unsigned int needed = (idx + 1024) * 3 / 2;
@ -207,6 +208,7 @@ static void add_object_entry(unsigned char *sha1, unsigned int hash)
memcpy(entry->sha1, sha1, 20);
entry->hash = hash;
nr_objects = idx+1;
return 1;
}
static void check_object(struct object_entry *entry)
@ -384,6 +386,7 @@ static void find_deltas(struct object_entry **list, int window, int depth)
int main(int argc, char **argv)
{
SHA_CTX ctx;
char line[PATH_MAX + 20];
int window = 10, depth = 10, pack_to_stdout = 0;
int i;
@ -428,6 +431,7 @@ int main(int argc, char **argv)
if (pack_to_stdout != !base_name)
usage(pack_usage);
SHA1_Init(&ctx);
while (fgets(line, sizeof(line), stdin) != NULL) {
unsigned int hash;
char *p;
@ -443,8 +447,10 @@ int main(int argc, char **argv)
continue;
hash = hash * 11 + c;
}
add_object_entry(sha1, hash);
if (add_object_entry(sha1, hash))
SHA1_Update(&ctx, sha1, 20);
}
SHA1_Final(object_list_sha1, &ctx);
if (non_empty && !nr_objects)
return 0;
get_object_details();
@ -457,7 +463,9 @@ int main(int argc, char **argv)
find_deltas(sorted_by_type, window+1, depth);
write_pack_file();
if (!pack_to_stdout)
if (!pack_to_stdout) {
write_index_file();
puts(sha1_to_hex(object_list_sha1));
}
return 0;
}