Commit fcc9131e authored by Mike Hibler's avatar Mike Hibler
Browse files

Truncate the hash file first when we create it.

Document the -D option to choose the hash.
parent c59b861f
......@@ -79,7 +79,7 @@ static int report = 0;
static int regfile = 0;
static int nothreads = 0;
static int hashtype = HASH_TYPE_SHA1;
static int hashlen = 16;
static int hashlen = 20;
static long hashblksize = HASHBLK_SIZE;
static unsigned long long ndatabytes;
static unsigned long nchunks, nregions, nhregions;
......@@ -243,13 +243,14 @@ usage(void)
"imagehash [-d] <image-filename> <device>\n"
" check the signature file for the specified image\n"
" against the specified disk device\n"
"imagehash -c [-dr] [-b blksize] [-o sigfile] <image-filename>\n"
"imagehash -c [-dr] [-D hfunc] [-b blksize] [-o sigfile] <image-filename>\n"
" create a signature file for the specified image\n"
"imagehash -R [-dr] [-b blksize] <image-filename>\n"
" output an ASCII report to stdout rather than creating a signature file\n"
"imagehash -v\n"
" print version info and exit\n"
"-D hfunc hash function to use (md5 or sha1)\n"
"-b blksize size of hash blocks (512 <= size <= 32M)\n"
"-d print additional detail to STDOUT\n"
"-o sigfile name to use for sig file, else <image>.sig\n"
......@@ -441,7 +442,7 @@ createhash(char *name, struct hashinfo **hinfop)
struct timeval tm[2];
hfile = signame(name);
ofd = open(hfile, O_RDWR|O_CREAT, 0666);
ofd = open(hfile, O_RDWR|O_CREAT|O_TRUNC, 0666);
if (ofd < 0) {
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