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git-fetch: Avoid reading packed refs over and over again

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When checking which tags to fetch, the old code used to call
git-show-ref --verify for each remote tag. Since reading even
packed refs is not a cheap operation when there are a lot of
local refs, the code became quite slow.

This fixes it by teaching git-show-ref to filter out existing
refs using a new mode of operation of git-show-ref.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2006-12-17 17:57:19 -08:00
parent ee6002aa42
commit ed9f7c954c
2 changed files with 62 additions and 10 deletions
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60
builtin-show-ref.c
View File

@ -2,8 +2,9 @@
#include "refs.h"
#include "object.h"
#include "tag.h"
#include "path-list.h"
static const char show_ref_usage[] = "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<length>]] [--abbrev[=<length>]] [--tags] [--heads] [--] [pattern*]";
static const char show_ref_usage[] = "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<length>]] [--abbrev[=<length>]] [--tags] [--heads] [--] [pattern*] | --filter-invalid < ref-list";
static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
@ -86,6 +87,59 @@ match:
return 0;
}
static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
{
struct path_list *list = (struct path_list *)cbdata;
path_list_insert(refname, list);
return 0;
}
/*
* read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
* and
* (1) strip "^{}" at the end of line if any;
* (2) ignore if match is provided and does not head-match refname;
* (3) warn if refname is not a well-formed refname and skip;
* (4) ignore if refname is a ref that exists in the local repository;
* (5) otherwise output the line.
*/
static int exclude_existing(const char *match)
{
static struct path_list existing_refs = { NULL, 0, 0, 0 };
char buf[1024];
int matchlen = match ? strlen(match) : 0;
for_each_ref(add_existing, &existing_refs);
while (fgets(buf, sizeof(buf), stdin)) {
int len = strlen(buf);
char *ref;
if (len > 0 && buf[len - 1] == '\n')
buf[--len] = '\0';
if (!strcmp(buf + len - 3, "^{}")) {
len -= 3;
buf[len] = '\0';
}
for (ref = buf + len; buf < ref; ref--)
if (isspace(ref[-1]))
break;
if (match) {
int reflen = buf + len - ref;
if (reflen < matchlen)
continue;
if (strncmp(ref, match, matchlen))
continue;
}
if (check_ref_format(ref)) {
fprintf(stderr, "warning: ref '%s' ignored\n", ref);
continue;
}
if (!path_list_has_path(&existing_refs, ref)) {
printf("%s\n", buf);
}
}
return 0;
}
int cmd_show_ref(int argc, const char **argv, const char *prefix)
{
int i;
@ -153,6 +207,10 @@ int cmd_show_ref(int argc, const char **argv, const char *prefix)
heads_only = 1;
continue;
}
if (!strcmp(arg, "--exclude-existing"))
return exclude_existing(NULL);
if (!strncmp(arg, "--exclude-existing=", 19))
return exclude_existing(arg + 19);
usage(show_ref_usage);
}
if (show_head)

12
git-fetch.sh
View File

@ -242,7 +242,7 @@ esac
reflist=$(get_remote_refs_for_fetch "$@")
if test "$tags"
then
taglist=`IFS=" " &&
taglist=`IFS=' ' &&
echo "$ls_remote_result" |
while read sha1 name
do
@ -438,17 +438,11 @@ case "$no_tags$tags" in
*:refs/*)
# effective only when we are following remote branch
# using local tracking branch.
taglist=$(IFS=" " &&
taglist=$(IFS=' ' &&
echo "$ls_remote_result" |
sed -n -e 's|^\('"$_x40"'\) \(refs/tags/.*\)^{}$|\1 \2|p' \
-e 's|^\('"$_x40"'\) \(refs/tags/.*\)$|\1 \2|p' |
git-show-ref --exclude-existing=refs/tags/ |
while read sha1 name
do
git-show-ref --verify --quiet -- "$name" && continue
git-check-ref-format "$name" || {
echo >&2 "warning: tag ${name} ignored"
continue
}
git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
echo >&2 "Auto-following $name"
echo ".${name}:${name}"