git-fetch--tool: start rewriting parts of git-fetch in C.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2007-01-16 00:23:24 -08:00
Родитель b74e8cbd80
Коммит d4289fff87
5 изменённых файлов: 227 добавлений и 124 удалений

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@ -282,6 +282,7 @@ BUILTIN_OBJS = \
builtin-diff-index.o \
builtin-diff-stages.o \
builtin-diff-tree.o \
builtin-fetch--tool.o \
builtin-fmt-merge-msg.o \
builtin-for-each-ref.o \
builtin-fsck.o \

214
builtin-fetch--tool.c Normal file
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@ -0,0 +1,214 @@
#include "cache.h"
#include "refs.h"
#include "commit.h"
static void show_new(char *type, unsigned char *sha1_new)
{
fprintf(stderr, " %s: %s\n", type,
find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
}
static int update_ref(const char *action,
const char *refname,
unsigned char *sha1,
unsigned char *oldval)
{
int len;
char msg[1024];
char *rla = getenv("GIT_REFLOG_ACTION");
static struct ref_lock *lock;
if (!rla)
rla = "(reflog update)";
len = snprintf(msg, sizeof(msg), "%s: %s", rla, action);
if (sizeof(msg) <= len)
die("insanely long action");
lock = lock_any_ref_for_update(refname, oldval);
if (!lock)
return 1;
if (write_ref_sha1(lock, sha1, msg) < 0)
return 1;
return 0;
}
static int update_local_ref(const char *name,
const char *new_head,
const char *note,
int verbose, int force)
{
char type[20];
unsigned char sha1_old[20], sha1_new[20];
char oldh[41], newh[41];
struct commit *current, *updated;
if (get_sha1_hex(new_head, sha1_new))
die("malformed object name %s", new_head);
if (sha1_object_info(sha1_new, type, NULL))
die("object %s not found", new_head);
if (!*name) {
/* Not storing */
if (verbose) {
fprintf(stderr, "* fetched %s\n", note);
show_new(type, sha1_new);
}
return 0;
}
if (get_sha1(name, sha1_old)) {
char *msg;
just_store:
/* new ref */
if (!strncmp(name, "refs/tags/", 10))
msg = "storing tag";
else
msg = "storing head";
fprintf(stderr, "* %s: storing %s\n",
name, note);
show_new(type, sha1_new);
return update_ref(msg, name, sha1_new, NULL);
}
if (!hashcmp(sha1_old, sha1_new)) {
if (verbose) {
fprintf(stderr, "* %s: same as %s\n", name, note);
show_new(type, sha1_new);
}
return 0;
}
if (!strncmp(name, "refs/tags/", 10)) {
fprintf(stderr, "* %s: updating with %s\n", name, note);
show_new(type, sha1_new);
return update_ref("updating tag", name, sha1_new, NULL);
}
current = lookup_commit_reference(sha1_old);
updated = lookup_commit_reference(sha1_new);
if (!current || !updated)
goto just_store;
strcpy(oldh, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
strcpy(newh, find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
if (in_merge_bases(current, &updated, 1)) {
fprintf(stderr, "* %s: fast forward to %s\n",
name, note);
fprintf(stderr, " old..new: %s..%s\n", oldh, newh);
return update_ref("fast forward", name, sha1_new, sha1_old);
}
if (!force) {
fprintf(stderr,
"* %s: not updating to non-fast forward %s\n",
name, note);
fprintf(stderr,
" old...new: %s...%s\n", oldh, newh);
return 1;
}
fprintf(stderr,
"* %s: forcing update to non-fast forward %s\n",
name, note);
fprintf(stderr, " old...new: %s...%s\n", oldh, newh);
return update_ref("forced-update", name, sha1_new, sha1_old);
}
static int append_fetch_head(FILE *fp,
const char *head, const char *remote,
const char *remote_name, const char *remote_nick,
const char *local_name, int not_for_merge,
int verbose, int force)
{
struct commit *commit;
int remote_len, i, note_len;
unsigned char sha1[20];
char note[1024];
const char *what, *kind;
if (get_sha1(head, sha1))
return error("Not a valid object name: %s", head);
commit = lookup_commit_reference(sha1);
if (!commit)
not_for_merge = 1;
if (!strcmp(remote_name, "HEAD")) {
kind = "";
what = "";
}
else if (!strncmp(remote_name, "refs/heads/", 11)) {
kind = "branch";
what = remote_name + 11;
}
else if (!strncmp(remote_name, "refs/tags/", 10)) {
kind = "tag";
what = remote_name + 10;
}
else if (!strncmp(remote_name, "refs/remotes/", 13)) {
kind = "remote branch";
what = remote_name + 13;
}
else {
kind = "";
what = remote_name;
}
remote_len = strlen(remote);
for (i = remote_len - 1; remote[i] == '/' && 0 <= i; i--)
;
remote_len = i + 1;
if (4 < i && !strncmp(".git", remote + i - 3, 4))
remote_len = i - 3;
note_len = sprintf(note, "%s\t%s\t",
sha1_to_hex(commit ? commit->object.sha1 : sha1),
not_for_merge ? "not-for-merge" : "");
if (*what) {
if (*kind)
note_len += sprintf(note + note_len, "%s ", kind);
note_len += sprintf(note + note_len, "'%s' of ", what);
}
note_len += sprintf(note + note_len, "%.*s", remote_len, remote);
fprintf(fp, "%s\n", note);
return update_local_ref(local_name, head, note, verbose, force);
}
int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
{
int verbose = 0;
int force = 0;
while (1 < argc) {
const char *arg = argv[1];
if (!strcmp("-v", arg))
verbose = 1;
else if (!strcmp("-f", arg))
force = 1;
else
break;
argc--;
argv++;
}
if (argc <= 1)
return error("Missing subcommand");
if (!strcmp("append-fetch-head", argv[1])) {
int result;
FILE *fp;
if (argc != 8)
return error("append-fetch-head takes 6 args");
fp = fopen(git_path("FETCH_HEAD"), "a");
result = append_fetch_head(fp, argv[2], argv[3],
argv[4], argv[5],
argv[6], !!argv[7][0],
verbose, force);
fclose(fp);
return result;
}
if (!strcmp("update-local-ref", argv[1])) {
if (argc != 5)
return error("update-local-ref takes 3 args");
return update_local_ref(argv[2], argv[3], argv[4],
verbose, force);
}
return error("Unknown subcommand: %s", argv[1]);
}

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@ -31,6 +31,7 @@ extern int cmd_diff_index(int argc, const char **argv, const char *prefix);
extern int cmd_diff(int argc, const char **argv, const char *prefix);
extern int cmd_diff_stages(int argc, const char **argv, const char *prefix);
extern int cmd_diff_tree(int argc, const char **argv, const char *prefix);
extern int cmd_fetch__tool(int argc, const char **argv, const char *prefix);
extern int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix);
extern int cmd_for_each_ref(int argc, const char **argv, const char *prefix);
extern int cmd_format_patch(int argc, const char **argv, const char *prefix);

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@ -107,133 +107,19 @@ ls_remote_result=$(git ls-remote $exec "$remote") ||
die "Cannot get the repository state from $remote"
append_fetch_head () {
head_="$1"
remote_="$2"
remote_name_="$3"
remote_nick_="$4"
local_name_="$5"
case "$6" in
t) not_for_merge_='not-for-merge' ;;
'') not_for_merge_= ;;
esac
# remote-nick is the URL given on the command line (or a shorthand)
# remote-name is the $GIT_DIR relative refs/ path we computed
# for this refspec.
# the $note_ variable will be fed to git-fmt-merge-msg for further
# processing.
case "$remote_name_" in
HEAD)
note_= ;;
refs/heads/*)
note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
note_="branch '$note_' of " ;;
refs/tags/*)
note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
note_="tag '$note_' of " ;;
refs/remotes/*)
note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
note_="remote branch '$note_' of " ;;
*)
note_="$remote_name of " ;;
esac
remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
remote_="$remote_1_"
note_="$note_$remote_"
# 2.6.11-tree tag would not be happy to be fed to resolve.
if git-cat-file commit "$head_" >/dev/null 2>&1
then
headc_=$(git-rev-parse --verify "$head_^0") || exit
echo "$headc_ $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
else
echo "$head_ not-for-merge $note_" >>"$GIT_DIR/FETCH_HEAD"
fi
update_local_ref "$local_name_" "$head_" "$note_"
flags=
test -n "$verbose" && flags="$flags -v"
test -n "$force" && flags="$flags -f"
GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
git-fetch--tool append-fetch-head $flags "$@"
}
update_local_ref () {
# If we are storing the head locally make sure that it is
# a fast forward (aka "reverse push").
label_=$(git-cat-file -t $2)
newshort_=$(git-rev-parse --short $2)
if test -z "$1" ; then
[ "$verbose" ] && echo >&2 "* fetched $3"
[ "$verbose" ] && echo >&2 " $label_: $newshort_"
return 0
fi
oldshort_=$(git show-ref --hash --abbrev "$1" 2>/dev/null)
case "$1" in
refs/tags/*)
# Tags need not be pointing at commits so there
# is no way to guarantee "fast-forward" anyway.
if test -n "$oldshort_"
then
if now_=$(git show-ref --hash "$1") && test "$now_" = "$2"
then
[ "$verbose" ] && echo >&2 "* $1: same as $3"
[ "$verbose" ] && echo >&2 " $label_: $newshort_" ||:
else
echo >&2 "* $1: updating with $3"
echo >&2 " $label_: $newshort_"
git-update-ref -m "$GIT_REFLOG_ACTION: updating tag" "$1" "$2"
fi
else
echo >&2 "* $1: storing $3"
echo >&2 " $label_: $newshort_"
git-update-ref -m "$GIT_REFLOG_ACTION: storing tag" "$1" "$2"
fi
;;
refs/heads/* | refs/remotes/*)
# $1 is the ref being updated.
# $2 is the new value for the ref.
local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
if test "$local"
then
# Require fast-forward.
mb=$(git-merge-base "$local" "$2") &&
case "$2,$mb" in
$local,*)
if test -n "$verbose"
then
echo >&2 "* $1: same as $3"
echo >&2 " $label_: $newshort_"
fi
;;
*,$local)
echo >&2 "* $1: fast forward to $3"
echo >&2 " old..new: $oldshort_..$newshort_"
git-update-ref -m "$GIT_REFLOG_ACTION: fast-forward" "$1" "$2" "$local"
;;
*)
false
;;
esac || {
case ",$force,$single_force," in
*,t,*)
echo >&2 "* $1: forcing update to non-fast forward $3"
echo >&2 " old...new: $oldshort_...$newshort_"
git-update-ref -m "$GIT_REFLOG_ACTION: forced-update" "$1" "$2" "$local"
;;
*)
echo >&2 "* $1: not updating to non-fast forward $3"
echo >&2 " old...new: $oldshort_...$newshort_"
exit 1
;;
esac
}
else
echo >&2 "* $1: storing $3"
echo >&2 " $label_: $newshort_"
git-update-ref -m "$GIT_REFLOG_ACTION: storing head" "$1" "$2"
fi
;;
esac
flags=
test -n "$verbose" && flags="$flags -v"
test -n "$force" && flags="$flags -f"
GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
git-fetch--tool update-local-ref $flags "$@"
}
# updating the current HEAD with git-fetch in a bare

1
git.c
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@ -242,6 +242,7 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
{ "diff-index", cmd_diff_index, RUN_SETUP },
{ "diff-stages", cmd_diff_stages, RUN_SETUP },
{ "diff-tree", cmd_diff_tree, RUN_SETUP },
{ "fetch--tool", cmd_fetch__tool, RUN_SETUP },
{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
{ "for-each-ref", cmd_for_each_ref, RUN_SETUP },
{ "format-patch", cmd_format_patch, RUN_SETUP },