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Built-in git-get-tar-commit-id

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By being an internal command git-get-commit-id can make use of
struct ustar_header and other stuff and stops wasting precious
disk space.

Note: I recycled one of the two "tar-tree" entries instead of
splitting that cleanup into a separate patch.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Rene Scharfe 2006-06-10 16:13:41 +02:00 committed by Junio C Hamano
parent 5e3a620cd5
commit 52ba03cbb1
5 changed files with 29 additions and 33 deletions
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4
Makefile
View file

@ -144,7 +144,7 @@ SCRIPTS = $(patsubst %.sh,%,$(SCRIPT_SH)) \
# The ones that do not have to link with lcrypto, lz nor xdiff.
SIMPLE_PROGRAMS = \
git-get-tar-commit-id$X git-mailsplit$X \
git-mailsplit$X \
git-stripspace$X git-daemon$X
# ... and all the rest that could be moved out of bindir to gitexecdir
@ -169,7 +169,7 @@ BUILT_INS = git-log$X git-whatchanged$X git-show$X \
git-grep$X git-add$X git-rm$X git-rev-list$X \
git-check-ref-format$X git-rev-parse$X \
git-init-db$X git-tar-tree$X git-upload-tar$X git-format-patch$X \
git-ls-files$X git-ls-tree$X \
git-ls-files$X git-ls-tree$X git-get-tar-commit-id$X \
git-read-tree$X git-commit-tree$X \
git-apply$X git-show-branch$X git-diff-files$X \
git-diff-index$X git-diff-stages$X git-diff-tree$X git-cat-file$X

25
builtin-tar-tree.c
View file

@ -402,3 +402,28 @@ int cmd_tar_tree(int argc, const char **argv, char **envp)
return remote_tar(argc, argv);
return generate_tar(argc, argv, envp);
}
/* ustar header + extended global header content */
#define HEADERSIZE (2 * RECORDSIZE)
int cmd_get_tar_commit_id(int argc, const char **argv, char **envp)
{
char buffer[HEADERSIZE];
struct ustar_header *header = (struct ustar_header *)buffer;
char *content = buffer + RECORDSIZE;
ssize_t n;
n = xread(0, buffer, HEADERSIZE);
if (n < HEADERSIZE)
die("git-get-tar-commit-id: read error");
if (header->typeflag[0] != 'g')
return 1;
if (memcmp(content, "52 comment=", 11))
return 1;
n = xwrite(1, content + 11, 41);
if (n < 41)
die("git-get-tar-commit-id: write error");
return 0;
}

1
builtin.h
View file

@ -32,6 +32,7 @@ extern int cmd_check_ref_format(int argc, const char **argv, char **envp);
extern int cmd_init_db(int argc, const char **argv, char **envp);
extern int cmd_tar_tree(int argc, const char **argv, char **envp);
extern int cmd_upload_tar(int argc, const char **argv, char **envp);
extern int cmd_get_tar_commit_id(int argc, const char **argv, char **envp);
extern int cmd_ls_files(int argc, const char **argv, char **envp);
extern int cmd_ls_tree(int argc, const char **argv, char **envp);
extern int cmd_read_tree(int argc, const char **argv, char **envp);

30
get-tar-commit-id.c
View file

@ -1,30 +0,0 @@
/*
* Copyright (C) 2005 Rene Scharfe
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define HEADERSIZE 1024
int main(int argc, char **argv)
{
char buffer[HEADERSIZE];
ssize_t n;
n = read(0, buffer, HEADERSIZE);
if (n < HEADERSIZE) {
fprintf(stderr, "read error\n");
return 3;
}
if (buffer[156] != 'g')
return 1;
if (memcmp(&buffer[512], "52 comment=", 11))
return 1;
n = write(1, &buffer[523], 41);
if (n < 41) {
fprintf(stderr, "write error\n");
return 2;
}
return 0;
}

2
git.c
View file

@ -163,7 +163,7 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
{ "add", cmd_add },
{ "rev-list", cmd_rev_list },
{ "init-db", cmd_init_db },
{ "tar-tree", cmd_tar_tree },
{ "get-tar-commit-id", cmd_get_tar_commit_id },
{ "upload-tar", cmd_upload_tar },
{ "check-ref-format", cmd_check_ref_format },
{ "ls-files", cmd_ls_files },