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tar-tree: Use the prefix field of a tar header

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... to store parts of the path, if possible.  This allows us to avoid
writing extended headers in certain cases (long pathes can only be
split at '/' chars).

Also adds a file to the test repo with a 100 chars long directory name.
Even old versions of tar that don't understand POSIX extended headers
should be able to handle this testcase.

Btw.: The longest path in the kernel tree currently has 70 chars.
Together with a 30 chars long prefix this would already cross the
field limit of 100 chars.

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 2006-03-25 23:21:07 +01:00 committed by Junio C Hamano
parent 86da1c567d
commit 4c691724f1
2 changed files with 24 additions and 3 deletions
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3
t/t5000-tar-tree.sh
View file

@ -34,6 +34,9 @@ test_expect_success \
mkdir a/bin &&
cp /bin/sh a/bin &&
ln -s a a/l1 &&
(p=long_path_to_a_file && cd a &&
for depth in 1 2 3 4 5; do mkdir $p && cd $p; done &&
echo text >file_with_long_path) &&
(cd a && find .) | sort >a.lst'
test_expect_success \

24
tar-tree.c
View file

@ -161,6 +161,16 @@ static unsigned int ustar_header_chksum(const struct ustar_header *header)
return chksum;
}
static int get_path_prefix(const struct strbuf *path, int maxlen)
{
int i = path->len;
if (i > maxlen)
i = maxlen;
while (i > 0 && path->buf[i] != '/')
i--;
return i;
}
static void write_entry(const unsigned char *sha1, struct strbuf *path,
unsigned int mode, void *buffer, unsigned long size)
{
@ -195,9 +205,17 @@ static void write_entry(const unsigned char *sha1, struct strbuf *path,
return;
}
if (path->len > sizeof(header.name)) {
sprintf(header.name, "%s.data", sha1_to_hex(sha1));
strbuf_append_ext_header(&ext_header, "path",
path->buf, path->len);
int plen = get_path_prefix(path, sizeof(header.prefix));
int rest = path->len - plen - 1;
if (plen > 0 && rest <= sizeof(header.name)) {
memcpy(header.prefix, path->buf, plen);
memcpy(header.name, path->buf + plen + 1, rest);
} else {
sprintf(header.name, "%s.data",
sha1_to_hex(sha1));
strbuf_append_ext_header(&ext_header, "path",
path->buf, path->len);
}
} else
memcpy(header.name, path->buf, path->len);
}