minix3/commands/ci/ci.c

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2020-02-21 00:59:27 +05:30
/* ci - check in Author: Peter S. Housel 12/17/87 */
#include <sys/types.h>
#include <string.h>
#include <sys/stat.h>
#include <pwd.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <stdio.h>
#define SUFFIX ",S" /* svc indicator */
#define SVCDIR "SVC" /* svc postfix indicator */
#define LINELEN 256 /* maximum line length */
#ifndef PATCH
#define FIX "fix $1 Fix.$1 > New.$1; mv New.$1 $1\n"
#else
#define FIX "patch -n -s $1 < Fix.$1; rm -f $1.orig\n"
#endif /* !PATCH */
#ifdef MAXPATHLEN
#define PATHLEN MAXPATHLEN
#else
#define PATHLEN 128 /* buffer length for filenames */
#endif
int unlocked = 0; /* leave unlocked after checkin */
int relock = 0; /* lock next revision after checkin */
char file[PATHLEN]; /* file to be checked in */
char svc[PATHLEN]; /* filename for svc file */
char newsvc[PATHLEN]; /* new copy of SVC file */
char line[LINELEN]; /* temporary line buffer */
char *p; /* scratch character pointer */
FILE *svcfp; /* svc file */
FILE *origfp, *newfp; /* "orig" and "new" temp files */
FILE *srcfp; /* source file */
int rev; /* new revision number */
int status; /* wait() buffer */
struct stat stb1, stb2; /* stat buffers for size compare */
char original[] = "/tmp/cioXXXXXX"; /* previous revision */
char diffout[] = "/tmp/cidXXXXXX"; /* diffs */
int main(int argc, char **argv);
void rundiff(void);
void logmsg(FILE *fp);
void fname(char *src, char *dst);
void svcname(char *src, char *dst);
int lockcheck(FILE *fp, int rev);
void onintr(int dummy);
void clean(void);
char *whoami(void);
int main(argc, argv)
int argc;
char **argv;
{
#ifdef perprintf
char errbuf[BUFSIZ];
setbuf(stderr, errbuf);
perprintf(stderr);
#endif
while (++argv, --argc) {
if ('-' == (*argv)[0]) {
if ('u' == (*argv)[1])
++unlocked;
else if ('l' == (*argv)[1])
++relock;
else {
fprintf(stderr, "ci: illegal option -%c\n", (*argv)[1]);
exit(1);
}
} else
break;
}
if (1 != argc) {
fprintf(stderr, "ci: bad number of files arguments\n");
exit(1);
}
fname(*argv, file);
svcname(file, svc);
fprintf(stderr, "%s -> %s\n", file, svc);
signal(SIGHUP, onintr);
signal(SIGINT, onintr);
signal(SIGTERM, onintr);
#ifndef BSD
if (NULL == (p = strrchr(file, '/')))
p = file;
else
++p;
if (strlen(p) > 13) {
fprintf(stderr, "ci: filename %s is too long\n", p);
exit(1);
}
#endif /* !BSD */
strcpy(newsvc, svc);
*(strrchr(newsvc, ',')) = ';'; /* temporary file will be "file;S" */
if (NULL == (newfp = fopen(newsvc, "w"))) {
perror("ci: can't create SVC temporary");
exit(1);
}
(void) mktemp(original);
(void) mktemp(diffout);
if (NULL != (svcfp = fopen(svc, "r"))) { /* does svc-file exist? */
fgets(line, LINELEN, svcfp);
if (1 != sscanf(line, "# %d", &rev)) {
fprintf(stderr, "ci: %s: illegal SVC file header\n", svc);
exit(1);
}
++rev;
if (!lockcheck(svcfp, rev)) {
fprintf(stderr, "Revision %d not locked\n", rev);
clean();
exit(1);
}
if (NULL == (origfp = fopen(original, "w"))) {
fprintf(stderr, "ci: can't create %s", original);
perror(" ");
}
fgets(line, LINELEN, svcfp); /* skip "cat <<***MAIN-eof***" line */
while (NULL != fgets(line, LINELEN, svcfp)
&& strcmp(line, "***MAIN-eof***\n")) {
fputs(line, origfp);
if (ferror(origfp)) {
perror("ci: origfile");
exit(1);
}
}
fclose(origfp);
rundiff();
if (0 != stat(original, &stb1) || 0 != stat(diffout, &stb2)) {
perror("ci: can't stat original or diffout");
clean();
exit(1);
}
} else { /* no - create one */
rev = 1;
}
fprintf(newfp, "# %d\n", rev);
fprintf(newfp, "cat <<***MAIN-eof*** >$1\n");
if (NULL == (srcfp = fopen(file, "r"))) {
perror("ci: can't read source file");
clean();
exit(1);
}
while (NULL != fgets(line, LINELEN, srcfp)) fputs(line, newfp);
fclose(srcfp);
fputs("***MAIN-eof***\n", newfp);
if (rev > 1) {
fprintf(newfp, "if test $2 -ge %d ; then rm -f Fix.$1 ; exit 0 ; fi ; cat <<***%d-eof*** >Fix.$1\n", rev, rev);
p = (stb1.st_size <= stb2.st_size) ? original : diffout;
if (NULL == (origfp = fopen(p, "r"))) {
perror("can't open diff output file");
clean();
exit(1);
}
while (NULL != fgets(line, LINELEN, origfp)) fputs(line, newfp);
fclose(origfp);
fprintf(newfp, "***%d-eof***\n", rev);
fputs((original == p) ? "mv Fix.$1 $1\n" : FIX, newfp);
logmsg(newfp);
while (NULL != fgets(line, LINELEN, svcfp) && strncmp(line, "#***SVCLOCK***", (size_t)14))
fputs(line, newfp);
} else {
logmsg(newfp);
fputs("rm -f Fix.$1\n", newfp);
}
if (relock) {
fprintf(stderr, "(relocking into revision %d)\n", rev + 1);
fprintf(newfp, "#***SVCLOCK*** %s %d\n", whoami(), rev + 1);
}
signal(SIGHUP, SIG_IGN); /* disable during critical section */
signal(SIGINT, SIG_IGN);
if (ferror(newfp) || fclose(newfp) || ((rev > 1) && unlink(svc))
|| link(newsvc, svc)) {
fprintf(stderr, "SVC file write/link error - Checkin aborted\n");
clean();
exit(1);
} else
fprintf(stderr, "Checkin complete.\n");
if (stat(svc, &stb1) < 0 || chmod(svc, stb1.st_mode & 0555) < 0)
perror("ci: can't chmod SVC file");
if (unlocked) {
if (stat(file, &stb1) < 0 || chmod(file, stb1.st_mode & 0555) < 0)
perror("ci: can't chmod source file");
} else if (relock) {
if (stat(file, &stb1) < 0 || chmod(file, stb1.st_mode | 0200) < 0)
perror("ci: can't chmod source file");
} else
unlink(file);
clean();
return(0);
}
void rundiff()
{ /* do "diff file original > diffout" */
int fd; /* redirected output file */
switch (fork()) {
case -1:
perror("ci: fork"); /* error */
clean();
exit(1);
case 0: /* child */
if ((fd = creat(diffout, 0600)) < 0 || -1 == dup2(fd, 1)) {
perror("ci: diffout");
clean();
exit(1);
}
close(fd);
execlp("diff", "diff", file, original, (char *) 0);
perror("ci: exec diff failed");
exit(1);
default: break; /* parent */
}
wait(&status);
if (0 != status && 1 << 8 != status) {
fprintf(stderr, "ci: bad return status (0x%x) from diff\n", status);
clean();
exit(1);
}
}
void logmsg(fp)
FILE *fp;
{
long now;
time(&now);
fprintf(stderr, "Enter log message for revision %d (end with ^D or '.'):\n", rev);
fprintf(fp, "#***SVC*** revision %d %s %s", rev, file, ctime(&now));
while (NULL != gets(line) && strcmp(line, "."))
fprintf(fp, "#***SVC*** %s\n", line);
}
void fname(src, dst)
char *src, *dst;
{
char *p;
strcpy(dst, src);
p = &dst[strlen(src) - strlen(SUFFIX)];
if (!strcmp(p, SUFFIX)) *p = '\0';
}
void svcname(src, dst)
char *src, *dst;
{
char *p;
strcpy(dst, src);
strcat(dst, SUFFIX);
if (0 != access(dst, 4)) {
char dirname[PATHLEN];
if (NULL != (p = strrchr(src, '/')))
strncpy(dirname, src, (size_t)(p - src + 1));
else
dirname[0] = '\0';
strcat(dirname, SVCDIR);
if (0 == access(dirname, 1)) {
strcpy(dst, dirname);
if (NULL == p) {
strcat(dst, "/");
strcat(dst, src);
} else
strcat(dst, p);
strcat(dst, SUFFIX);
}
}
}
int lockcheck(fp, rev)
FILE *fp;
int rev;
{
char lock[40], check[40];
long pos;
int ret;
sprintf(lock, "#***SVCLOCK*** %s %d\n", whoami(), rev);
pos = ftell(fp);
fseek(fp, -((long) strlen(lock)), 2);
fgets(check, 40, fp);
ret = (0 == strcmp(lock, check));
fseek(fp, pos, 0);
return ret;
}
void onintr(dummy)
int dummy; /* to keep the compiler happy */
{
fprintf(stderr, "Interrupt - Aborting checkin, cleaning up\n");
clean();
exit(1);
}
void clean()
{
if (strlen(original)) /* if only more programs made this check! */
unlink(original);
if (strlen(diffout)) unlink(diffout);
if (strlen(newsvc)) unlink(newsvc);
}
char *whoami()
{
struct passwd *pw;
if (NULL != (pw = getpwuid(getuid())))
return pw->pw_name;
else
return "nobody";
}