File: [local] / src / usr.bin / cvs / diff.c (download)
Revision 1.131, Wed Feb 27 22:34:04 2008 UTC (16 years, 3 months ago) by joris
Branch: MAIN
Changes since 1.130: +22 -9 lines
prevent file races
ok tobias@
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/* $OpenBSD: diff.c,v 1.131 2008/02/27 22:34:04 joris Exp $ */
/*
* Copyright (c) 2006 Joris Vink <joris@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/stat.h>
#include <sys/time.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "cvs.h"
#include "diff.h"
#include "remote.h"
void cvs_diff_local(struct cvs_file *);
static int Nflag = 0;
static int force_head = 0;
static char *koptstr;
static char *rev1 = NULL;
static char *rev2 = NULL;
struct cvs_cmd cvs_cmd_diff = {
CVS_OP_DIFF, CVS_USE_WDIR, "diff",
{ "di", "dif" },
"Show differences between revisions",
"[-cilNnpRu] [[-D date] [-r rev] [-D date2 | -r rev2]] "
"[-k mode] [file ...]",
"cfD:ik:lNnpr:Ru",
NULL,
cvs_diff
};
struct cvs_cmd cvs_cmd_rdiff = {
CVS_OP_RDIFF, 0, "rdiff",
{ "patch", "pa" },
"Show differences between revisions",
"[-flR] [-c | -u] [-s | -t] [-V ver] -D date | -r rev\n"
"[-D date2 | -r rev2] [-k mode] module ...",
"cfD:k:lr:RuV:",
NULL,
cvs_diff
};
int
cvs_diff(int argc, char **argv)
{
int ch, flags;
char *arg = ".";
struct cvs_recursion cr;
flags = CR_RECURSE_DIRS;
strlcpy(diffargs, cvs_cmdop == CVS_OP_DIFF ? "diff" : "rdiff",
sizeof(diffargs));
while ((ch = getopt(argc, argv, cvs_cmdop == CVS_OP_DIFF ?
cvs_cmd_diff.cmd_opts : cvs_cmd_rdiff.cmd_opts)) != -1) {
switch (ch) {
case 'c':
strlcat(diffargs, " -c", sizeof(diffargs));
diff_format = D_CONTEXT;
break;
case 'f':
force_head = 1;
break;
case 'i':
strlcat(diffargs, " -i", sizeof(diffargs));
diff_iflag = 1;
break;
case 'k':
koptstr = optarg;
kflag = rcs_kflag_get(koptstr);
if (RCS_KWEXP_INVAL(kflag)) {
cvs_log(LP_ERR,
"invalid RCS keyword expension mode");
fatal("%s", cvs_cmd_add.cmd_synopsis);
}
break;
case 'l':
flags &= ~CR_RECURSE_DIRS;
break;
case 'n':
strlcat(diffargs, " -n", sizeof(diffargs));
diff_format = D_RCSDIFF;
break;
case 'N':
Nflag = 1;
break;
case 'p':
strlcat(diffargs, " -p", sizeof(diffargs));
diff_pflag = 1;
break;
case 'R':
flags |= CR_RECURSE_DIRS;
break;
case 'r':
if (rev1 == NULL) {
rev1 = optarg;
} else if (rev2 == NULL) {
rev2 = optarg;
} else {
fatal("no more than 2 revisions/dates can"
" be specified");
}
break;
case 'u':
strlcat(diffargs, " -u", sizeof(diffargs));
diff_format = D_UNIFIED;
break;
case 'V':
fatal("the -V option is obsolete "
"and should not be used");
default:
fatal("%s", cvs_cmd_diff.cmd_synopsis);
}
}
argc -= optind;
argv += optind;
cr.enterdir = NULL;
cr.leavedir = NULL;
if (cvs_cmdop == CVS_OP_RDIFF) {
if (rev1 == NULL)
fatal("must specify at least one revision/date!");
if (!diff_format) {
strlcat(diffargs, " -c", sizeof(diffargs));
diff_format = D_CONTEXT;
}
flags |= CR_REPO;
}
if (current_cvsroot->cr_method != CVS_METHOD_LOCAL) {
cvs_client_connect_to_server();
cr.fileproc = cvs_client_sendfile;
if (!(flags & CR_RECURSE_DIRS))
cvs_client_send_request("Argument -l");
if (kflag)
cvs_client_send_request("Argument -k%s", koptstr);
switch (diff_format) {
case D_CONTEXT:
cvs_client_send_request("Argument -c");
break;
case D_RCSDIFF:
cvs_client_send_request("Argument -n");
break;
case D_UNIFIED:
cvs_client_send_request("Argument -u");
break;
default:
break;
}
if (Nflag == 1)
cvs_client_send_request("Argument -N");
if (diff_pflag == 1)
cvs_client_send_request("Argument -p");
if (rev1 != NULL)
cvs_client_send_request("Argument -r%s", rev1);
if (rev2 != NULL)
cvs_client_send_request("Argument -r%s", rev2);
} else {
if (cvs_cmdop == CVS_OP_RDIFF &&
chdir(current_cvsroot->cr_dir) == -1)
fatal("cvs_diff: %s", strerror(errno));
cr.fileproc = cvs_diff_local;
}
cr.flags = flags;
diff_rev1 = diff_rev2 = NULL;
if (cvs_cmdop == CVS_OP_DIFF ||
current_cvsroot->cr_method == CVS_METHOD_LOCAL) {
if (argc > 0)
cvs_file_run(argc, argv, &cr);
else
cvs_file_run(1, &arg, &cr);
}
if (current_cvsroot->cr_method != CVS_METHOD_LOCAL) {
cvs_client_send_files(argv, argc);
cvs_client_senddir(".");
cvs_client_send_request((cvs_cmdop == CVS_OP_RDIFF) ?
"rdiff" : "diff");
cvs_client_get_responses();
}
return (0);
}
void
cvs_diff_local(struct cvs_file *cf)
{
RCSNUM *r1;
BUF *b1;
int fd1, fd2;
struct stat st;
struct timeval tv[2], tv2[2];
char rbuf[CVS_REV_BUFSZ], *p1, *p2;
r1 = NULL;
b1 = NULL;
cvs_log(LP_TRACE, "cvs_diff_local(%s)", cf->file_path);
if (cf->file_type == CVS_DIR) {
if (verbosity > 1)
cvs_log(LP_NOTICE, "Diffing inside %s", cf->file_path);
return;
}
cvs_file_classify(cf, cvs_directory_tag);
if (cf->file_status == FILE_LOST) {
cvs_log(LP_ERR, "cannot find file %s", cf->file_path);
return;
} else if (cf->file_status == FILE_UNKNOWN) {
cvs_log(LP_ERR, "I know nothing about %s", cf->file_path);
return;
} else if (cf->file_status == FILE_ADDED && Nflag == 0) {
cvs_log(LP_ERR, "%s is a new entry, no comparison available",
cf->file_path);
return;
} else if (cf->file_status == FILE_REMOVED && Nflag == 0) {
cvs_log(LP_ERR, "%s was removed, no comparison available",
cf->file_path);
return;
} else if (cf->file_status == FILE_UPTODATE && rev1 == NULL &&
rev2 == NULL) {
return;
}
if (kflag)
rcs_kwexp_set(cf->file_rcs, kflag);
if (rev1 != NULL)
if ((diff_rev1 = rcs_translate_tag(rev1, cf->file_rcs)) ==
NULL) {
if (cvs_cmdop == CVS_OP_DIFF) {
cvs_log(LP_ERR, "tag %s is not in file %s",
rev1, cf->file_path);
return;
}
if (force_head) {
/* -f is not allowed for unknown symbols */
diff_rev1 = rcsnum_parse(rev1);
if (diff_rev1 == NULL)
fatal("no such tag %s", rev1);
rcsnum_free(diff_rev1);
diff_rev1 = rcsnum_alloc();
rcsnum_cpy(cf->file_rcs->rf_head, diff_rev1, 0);
}
}
if (rev2 != NULL)
if ((diff_rev2 = rcs_translate_tag(rev2, cf->file_rcs)) ==
NULL) {
if (cvs_cmdop == CVS_OP_DIFF) {
rcsnum_free(diff_rev1);
cvs_log(LP_ERR, "tag %s is not in file %s",
rev2, cf->file_path);
return;
}
if (force_head) {
/* -f is not allowed for unknown symbols */
diff_rev2 = rcsnum_parse(rev2);
if (diff_rev2 == NULL)
fatal("no such tag %s", rev2);
rcsnum_free(diff_rev2);
diff_rev2 = rcsnum_alloc();
rcsnum_cpy(cf->file_rcs->rf_head, diff_rev2, 0);
}
}
if (cvs_cmdop == CVS_OP_RDIFF && diff_rev1 == NULL && diff_rev2 == NULL)
return;
diff_file = cf->file_path;
cvs_printf("Index: %s\n", cf->file_path);
if (cvs_cmdop == CVS_OP_DIFF)
cvs_printf("%s\nRCS file: %s\n", RCS_DIFF_DIV, cf->file_rpath);
(void)xasprintf(&p1, "%s/diff1.XXXXXXXXXX", cvs_tmpdir);
(void)xasprintf(&p2, "%s/diff2.XXXXXXXXXX", cvs_tmpdir);
if (cf->file_status != FILE_ADDED) {
if (diff_rev1 != NULL)
r1 = diff_rev1;
else if (cf->file_ent != NULL)
r1 = cf->file_ent->ce_rev;
else
r1 = NULL;
diff_rev1 = r1;
if (diff_rev1 != NULL) {
(void)rcsnum_tostr(r1, rbuf, sizeof(rbuf));
tv[0].tv_sec = rcs_rev_getdate(cf->file_rcs, r1);
tv[0].tv_usec = 0;
tv[1] = tv[0];
if (cvs_cmdop == CVS_OP_DIFF)
cvs_printf("retrieving revision %s\n", rbuf);
fd1 = rcs_rev_write_stmp(cf->file_rcs, r1, p1, 0);
if (futimes(fd1, tv) == -1)
fatal("cvs_diff_local: utimes failed");
}
}
if (diff_rev2 != NULL && cf->file_status != FILE_ADDED &&
cf->file_status != FILE_REMOVED) {
(void)rcsnum_tostr(diff_rev2, rbuf, sizeof(rbuf));
tv2[0].tv_sec = rcs_rev_getdate(cf->file_rcs, diff_rev2);
tv2[0].tv_usec = 0;
tv2[1] = tv2[0];
if (cvs_cmdop == CVS_OP_DIFF)
cvs_printf("retrieving revision %s\n", rbuf);
fd2 = rcs_rev_write_stmp(cf->file_rcs, diff_rev2, p2, 0);
if (futimes(fd2, tv2) == -1)
fatal("cvs_diff_local: utimes failed");
} else if (cf->file_status != FILE_REMOVED) {
if (cvs_cmdop == CVS_OP_RDIFF || (cvs_server_active == 1 &&
cf->file_status != FILE_MODIFIED)) {
if (diff_rev2 != NULL) {
tv2[0].tv_sec = rcs_rev_getdate(cf->file_rcs,
cf->file_rcsrev);
tv2[0].tv_usec = 0;
tv2[1] = tv2[0];
fd2 = rcs_rev_write_stmp(cf->file_rcs,
cf->file_rcsrev, p2, 0);
if (futimes(fd2, tv2) == -1)
fatal("cvs_diff_local: utimes failed");
}
} else {
if (fstat(cf->fd, &st) == -1)
fatal("fstat failed %s", strerror(errno));
b1 = cvs_buf_load_fd(cf->fd);
tv2[0].tv_sec = st.st_mtime;
tv2[0].tv_usec = 0;
tv2[1] = tv2[0];
fd2 = cvs_buf_write_stmp(b1, p2, tv2);
cvs_buf_free(b1);
}
}
if (cvs_cmdop == CVS_OP_DIFF) {
cvs_printf("%s", diffargs);
if (cf->file_status != FILE_ADDED) {
(void)rcsnum_tostr(r1, rbuf, sizeof(rbuf));
cvs_printf(" -r%s", rbuf);
if (diff_rev2 != NULL) {
(void)rcsnum_tostr(diff_rev2, rbuf,
sizeof(rbuf));
cvs_printf(" -r%s", rbuf);
}
}
if (diff_rev2 == NULL)
cvs_printf(" %s", cf->file_name);
cvs_printf("\n");
} else {
cvs_printf("diff ");
switch (diff_format) {
case D_CONTEXT:
cvs_printf("-c ");
break;
case D_RCSDIFF:
cvs_printf("-n ");
break;
case D_UNIFIED:
cvs_printf("-u ");
break;
default:
break;
}
if (diff_rev1 == NULL) {
cvs_printf("%s ", CVS_PATH_DEVNULL);
} else {
(void)rcsnum_tostr(diff_rev1, rbuf, sizeof(rbuf));
cvs_printf("%s:%s ", cf->file_path, rbuf);
}
if (diff_rev2 == NULL) {
cvs_printf("%s:removed\n", cf->file_path);
} else {
(void)rcsnum_tostr(diff_rev2 != NULL ? diff_rev2 :
cf->file_rcs->rf_head, rbuf, sizeof(rbuf));
cvs_printf("%s:%s\n", cf->file_path, rbuf);
}
}
if (cf->file_status == FILE_ADDED ||
(cvs_cmdop == CVS_OP_RDIFF && diff_rev1 == NULL)) {
xfree(p1);
close(fd1);
(void)xasprintf(&p1, "%s", CVS_PATH_DEVNULL);
if ((fd1 = open(p1, O_RDONLY)) == -1)
fatal("cvs_diff_local: cannot open %s",
CVS_PATH_DEVNULL);
} else if (cf->file_status == FILE_REMOVED ||
(cvs_cmdop == CVS_OP_RDIFF && diff_rev2 == NULL)) {
xfree(p2);
close(fd2);
(void)xasprintf(&p2, "%s", CVS_PATH_DEVNULL);
if ((fd1 = open(p2, O_RDONLY)) == -1)
fatal("cvs_diff_local: cannot open %s",
CVS_PATH_DEVNULL);
}
if (cvs_diffreg(p1, p2, fd1, fd2, NULL) == D_ERROR)
fatal("cvs_diff_local: failed to get RCS patch");
close(fd1);
close(fd2);
cvs_worklist_run(&temp_files, cvs_worklist_unlink);
if (p1 != NULL)
xfree(p1);
if (p2 != NULL)
xfree(p2);
if (diff_rev1 != NULL && diff_rev1 != cf->file_rcs->rf_head &&
(cf->file_ent != NULL && diff_rev1 != cf->file_ent->ce_rev))
rcsnum_free(diff_rev1);
if (diff_rev2 != NULL)
rcsnum_free(diff_rev2);
diff_rev1 = diff_rev2 = NULL;
}