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Overview
| Comment: | Use a Blob object rather than a custom printf function in order to construct the PAX header for tarballs. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | ge-tarfix |
| Files: | files | file ages | folders |
| SHA1: |
02ce8b4a46822a7af941515516299701 |
| User & Date: | drh 2011-07-24 19:47:12 |
| Original Comment: | Use a Blob object rather than a custom printf function in order to construct the PAX header for tarballs. |
Context
|
2011-07-25
| ||
| 11:21 | Merge the ge-tarfix changes into trunk. This fixes tarball generation for repos that have very long filenames. check-in: a26940c2 user: drh tags: trunk | |
|
2011-07-24
| ||
| 19:47 | Use a Blob object rather than a custom printf function in order to construct the PAX header for tarballs. Closed-Leaf check-in: 02ce8b4a user: drh tags: ge-tarfix | |
| 00:36 | Improvements to tar generation. Uses the format documented in Posix.1-2008 to handle long file names and UTF-8. check-in: 2ef37b3b user: ge tags: ge-tarfix | |
Changes
Changes to src/tar.c.
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** State information for the tarball builder.
*/
static struct tarball_t {
unsigned char *aHdr; /* Space for building headers */
char *zSpaces; /* Spaces for padding */
char *zPrevDir; /* Name of directory for previous entry */
int nPrevDirAlloc; /* size of zPrevDir */
char *pScratch; /* scratch buffer used to build PAX data */
int nScratchUsed; /* part of buffer containing data */
int nScratchAlloc; /* size of buffer */
} tball;
/*
** field lengths of 'ustar' name and prefix fields.
*/
#define USTAR_NAME_LEN 100
................................................................................
tball.aHdr = fossil_malloc(512+512);
memset(tball.aHdr, 0, 512+512);
tball.zSpaces = (char*)&tball.aHdr[512];
/* zPrevDir init */
tball.zPrevDir = NULL;
tball.nPrevDirAlloc = 0;
/* scratch buffer init */
tball.pScratch = NULL;
tball.nScratchUsed = 0;
tball.nScratchAlloc = 0;
memcpy(&tball.aHdr[108], "0000000", 8); /* Owner ID */
memcpy(&tball.aHdr[116], "0000000", 8); /* Group ID */
memcpy(&tball.aHdr[257], "ustar\00000", 8); /* POSIX.1 format */
memcpy(&tball.aHdr[265], "nobody", 7); /* Owner name */
memcpy(&tball.aHdr[297], "nobody", 7); /* Group name */
gzip_begin();
db_multi_exec(
"CREATE TEMP TABLE dir(name UNIQUE);"
);
}
/*
** print to the scratch buffer
**
** used to build the Pax Interchange Format data, and create
** pseudo-file names for the header data.
**
** The buffer is grown automatically to accommodate the data.
*/
static int scratch_printf(
const char *fmt,
...
){
for(;;){
int newSize, minSpace, n;
/* calculate space in buffer */
int space = tball.nScratchAlloc - tball.nScratchUsed;
/* format the string */
va_list vl;
va_start(vl, fmt);
n = vsnprintf(&tball.pScratch[tball.nScratchUsed], space, fmt, vl);
assert(n >= 0);
va_end(vl);
/* if it fit we're done */
if(n < space)
return n;
/* buffer too short: calculate reasonable new size */
minSpace = tball.nScratchUsed+n+1;
newSize = 2 * tball.nScratchAlloc;
if(newSize < minSpace)
newSize = minSpace;
/* grow the buffer */
tball.pScratch = fossil_realloc(tball.pScratch, newSize);
tball.nScratchAlloc = newSize;
/* loop to try again */
}
}
/*
** verify that lla characters in 'zName' are in the
** ISO646 (=ASCII) character set.
*/
static int is_iso646_name(
const char *zName, /* file path */
int nName /* path length */
){
int i;
for(i = 0; i < nName; i++){
unsigned char c = (unsigned char)zName[i];
if(c > 0x7e)
return 0;
}
return 1;
}
/*
** copy string pSrc into pDst, truncating or padding with 0 if necessary
................................................................................
/* only search if the string needs splitting */
if(nName > USTAR_NAME_LEN){
for(i = 1; i+1 < nName; i++)
if(zName[i] == '/'){
split = i+1;
/* if the split position is within USTAR_NAME_LEN bytes from
* the end we can quit */
if(nName - split <= USTAR_NAME_LEN)
break;
}
}
return split;
}
/*
................................................................................
const char *zName, /* path */
int nName, /* path length */
char *pName, /* name field */
char *pPrefix /* prefix field */
){
int split = find_split_pos(zName, nName);
/* check whether both pieces fit */
if(nName - split > USTAR_NAME_LEN || split > USTAR_PREFIX_LEN+1)
return 0; /* no */
/* extract name */
padded_copy(pName, USTAR_NAME_LEN, &zName[split], nName - split);
/* extract prefix */
padded_copy(pPrefix, USTAR_PREFIX_LEN, zName, (split > 0 ? split - 1 : 0));
................................................................................
char *pName, /* name field */
char *pPrefix, /* prefix field */
int bHeader /* is this a 'x' type tar header? */
){
int split;
/* if this is a Pax Interchange header prepend "PaxHeader/"
* so we can tell files apart from metadata */
if(bHeader){
int n;
tball.nScratchUsed = 0;
n = scratch_printf("PaxHeader/%*.*s", nName, nName, zName);
zName = tball.pScratch;
nName = n;
}
/* find the split position */
split = find_split_pos(zName, nName);
/* extract a name, truncate if needed */
padded_copy(pName, USTAR_NAME_LEN, &zName[split], nName - split);
................................................................................
int next10 = 1;
int n;
for(n = blen; n > 0; ){
blen++; next10 *= 10;
n /= 10;
}
/* adding the length extended the length field? */
if(blen > next10)
blen++;
/* build the string */
n = scratch_printf("%d %s=%*.*s\n", blen, zField, nValue, nValue, zValue);
/* this _must_ be right */
if(n != blen)
fossil_fatal("internal error: PAX tar header has bad length");
/* add length to scratch buffer */
tball.nScratchUsed += blen;
}
/*
** set the header type, calculate the checksum and output
** the header
*/
................................................................................
if( !is_iso646_name(zName, nName) ||
!tar_split_path(zName, nName, tball.aHdr, &tball.aHdr[345]) ){
int lastPage;
/* add a file name for interoperability with older programs */
approximate_split_path(zName, nName, tball.aHdr, &tball.aHdr[345], 1);
/* generate the Pax Interchange path header */
tball.nScratchUsed = 0;
add_pax_header("path", zName, nName);
/* set the header length, and write the header */
sqlite3_snprintf(12, (char*)&tball.aHdr[124], "%011o", tball.nScratchUsed);
cksum_and_write_header('x');
/* write the Pax Interchange data */
gzip_step(tball.pScratch, tball.nScratchUsed);
lastPage = tball.nScratchUsed % 512;
if( lastPage!=0 )
gzip_step(tball.zSpaces, 512 - lastPage);
/* generate an approximate path for the regular header */
approximate_split_path(zName, nName, tball.aHdr, &tball.aHdr[345], 0);
}
/* set the size */
sqlite3_snprintf(12, (char*)&tball.aHdr[124], "%011o", iSize);
................................................................................
gzip_step(tball.zSpaces, 512);
gzip_finish(pOut);
fossil_free(tball.aHdr);
tball.aHdr = 0;
fossil_free(tball.zPrevDir);
tball.zPrevDir = NULL;
tball.nPrevDirAlloc = 0;
fossil_free(tball.pScratch);
tball.pScratch = NULL;
tball.nScratchUsed = 0;
tball.nScratchAlloc = 0;
}
/*
** COMMAND: test-tarball
**
** Generate a GZIP-compresssed tarball in the file given by the first argument
|
| < < | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | | < | > | | | | | | | | > | | < < > | | > | | | > | < < < |
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** State information for the tarball builder.
*/
static struct tarball_t {
unsigned char *aHdr; /* Space for building headers */
char *zSpaces; /* Spaces for padding */
char *zPrevDir; /* Name of directory for previous entry */
int nPrevDirAlloc; /* size of zPrevDir */
Blob pax; /* PAX data */
} tball;
/*
** field lengths of 'ustar' name and prefix fields.
*/
#define USTAR_NAME_LEN 100
................................................................................
tball.aHdr = fossil_malloc(512+512);
memset(tball.aHdr, 0, 512+512);
tball.zSpaces = (char*)&tball.aHdr[512];
/* zPrevDir init */
tball.zPrevDir = NULL;
tball.nPrevDirAlloc = 0;
/* scratch buffer init */
blob_zero(&tball.pax);
memcpy(&tball.aHdr[108], "0000000", 8); /* Owner ID */
memcpy(&tball.aHdr[116], "0000000", 8); /* Group ID */
memcpy(&tball.aHdr[257], "ustar\00000", 8); /* POSIX.1 format */
memcpy(&tball.aHdr[265], "nobody", 7); /* Owner name */
memcpy(&tball.aHdr[297], "nobody", 7); /* Group name */
gzip_begin();
db_multi_exec(
"CREATE TEMP TABLE dir(name UNIQUE);"
);
}
/*
** verify that lla characters in 'zName' are in the
** ISO646 (=ASCII) character set.
*/
static int is_iso646_name(
const char *zName, /* file path */
int nName /* path length */
){
int i;
for(i = 0; i < nName; i++){
unsigned char c = (unsigned char)zName[i];
if( c>0x7e ) return 0;
}
return 1;
}
/*
** copy string pSrc into pDst, truncating or padding with 0 if necessary
................................................................................
/* only search if the string needs splitting */
if(nName > USTAR_NAME_LEN){
for(i = 1; i+1 < nName; i++)
if(zName[i] == '/'){
split = i+1;
/* if the split position is within USTAR_NAME_LEN bytes from
* the end we can quit */
if(nName - split <= USTAR_NAME_LEN) break;
}
}
return split;
}
/*
................................................................................
const char *zName, /* path */
int nName, /* path length */
char *pName, /* name field */
char *pPrefix /* prefix field */
){
int split = find_split_pos(zName, nName);
/* check whether both pieces fit */
if(nName - split > USTAR_NAME_LEN || split > USTAR_PREFIX_LEN+1){
return 0; /* no */
}
/* extract name */
padded_copy(pName, USTAR_NAME_LEN, &zName[split], nName - split);
/* extract prefix */
padded_copy(pPrefix, USTAR_PREFIX_LEN, zName, (split > 0 ? split - 1 : 0));
................................................................................
char *pName, /* name field */
char *pPrefix, /* prefix field */
int bHeader /* is this a 'x' type tar header? */
){
int split;
/* if this is a Pax Interchange header prepend "PaxHeader/"
** so we can tell files apart from metadata */
if( bHeader ){
int n;
blob_reset(&tball.pax);
blob_appendf(&tball.pax, "PaxHeader/%*.*s", nName, nName, zName);
zName = blob_buffer(&tball.pax);
nName = blob_size(&tball.pax);
}
/* find the split position */
split = find_split_pos(zName, nName);
/* extract a name, truncate if needed */
padded_copy(pName, USTAR_NAME_LEN, &zName[split], nName - split);
................................................................................
int next10 = 1;
int n;
for(n = blen; n > 0; ){
blen++; next10 *= 10;
n /= 10;
}
/* adding the length extended the length field? */
if(blen > next10){
blen++;
}
/* build the string */
blob_appendf(&tball.pax, "%d %s=%*.*s\n", blen, zField, nValue, nValue, zValue);
/* this _must_ be right */
if(blob_size(&tball.pax) != blen){
fossil_fatal("internal error: PAX tar header has bad length");
}
}
/*
** set the header type, calculate the checksum and output
** the header
*/
................................................................................
if( !is_iso646_name(zName, nName) ||
!tar_split_path(zName, nName, tball.aHdr, &tball.aHdr[345]) ){
int lastPage;
/* add a file name for interoperability with older programs */
approximate_split_path(zName, nName, tball.aHdr, &tball.aHdr[345], 1);
/* generate the Pax Interchange path header */
blob_reset(&tball.pax);
add_pax_header("path", zName, nName);
/* set the header length, and write the header */
sqlite3_snprintf(12, (char*)&tball.aHdr[124], "%011o",
blob_size(&tball.pax));
cksum_and_write_header('x');
/* write the Pax Interchange data */
gzip_step(blob_buffer(&tball.pax), blob_size(&tball.pax));
lastPage = blob_size(&tball.pax) % 512;
if( lastPage!=0 ){
gzip_step(tball.zSpaces, 512 - lastPage);
}
/* generate an approximate path for the regular header */
approximate_split_path(zName, nName, tball.aHdr, &tball.aHdr[345], 0);
}
/* set the size */
sqlite3_snprintf(12, (char*)&tball.aHdr[124], "%011o", iSize);
................................................................................
gzip_step(tball.zSpaces, 512);
gzip_finish(pOut);
fossil_free(tball.aHdr);
tball.aHdr = 0;
fossil_free(tball.zPrevDir);
tball.zPrevDir = NULL;
tball.nPrevDirAlloc = 0;
blob_reset(&tball.pax);
}
/*
** COMMAND: test-tarball
**
** Generate a GZIP-compresssed tarball in the file given by the first argument
|