ref: ac98922f44c3df8839f1bdd07f23fcccf27d0cba
dir: /sys/src/cmd/history.c/
#include <u.h> #include <libc.h> #define MINUTE(x) ((long)(x)*60L) #define HOUR(x) (MINUTE(x)*60L) #define YEAR(x) (HOUR(x)*24L*360L) int verb; int uflag; int force; int diff; char* sflag; char* dargv[20] = { "diff", }; int ndargv = 1; void usage(void); void ysearch(char*, char*); long starttime(char*); void lastbefore(ulong, char*, char*, char*); char* prtime(ulong); void darg(char*); void main(int argc, char *argv[]) { int i; char *ndump; ndump = nil; ARGBEGIN { default: usage(); case 'a': darg("-a"); break; case 'b': darg("-b"); break; case 'c': darg("-c"); break; case 'e': darg("-e"); break; case 'm': darg("-m"); break; case 'n': darg("-n"); break; case 'w': darg("-w"); break; case 'D': diff = 1; break; case 'd': ndump = ARGF(); break; case 'f': force = 1; break; case 's': sflag = ARGF(); break; case 'u': uflag = 1; break; case 'v': verb = 1; break; } ARGEND if(argc == 0) usage(); for(i=0; i<argc; i++) ysearch(argv[i], ndump); exits(0); } void darg(char* a) { if(ndargv >= nelem(dargv)-3) return; dargv[ndargv++] = a; } void usage(void) { fprint(2, "usage: history [-bDfuv] [-d dumpfilesystem] [-s yyyymmdd] files\n"); exits("usage"); } void ysearch(char *file, char *ndump) { char fil[400], buf[500], nbuf[100], pair[2][500], *p; Tm *tm; Waitmsg *w; Dir *dir, *d; ulong otime, dt; int toggle, started, missing; fil[0] = 0; if(file[0] != '/') { getwd(strchr(fil, 0), 100); strcat(fil, "/"); } strcat(fil, file); if(memcmp(fil, "/n/", 3) == 0){ p = strchr(fil+3, '/'); if(p == nil) p = fil+strlen(fil); if(ndump == nil){ if(p-fil >= sizeof nbuf-10){ fprint(2, "%s: dump name too long", fil); return; } memmove(nbuf, fil+3, p-(fil+3)); nbuf[p-(fil+3)] = 0; strcat(nbuf, "dump"); ndump = nbuf; } memmove(fil, p, strlen(p)+1); } if(ndump == nil) ndump = "dump"; tm = localtime(time(0)); snprint(buf, sizeof buf, "/n/%s/%.4d/", ndump, tm->year+1900); if(access(buf, AREAD) < 0) { if(verb) print("mounting dump %s\n", ndump); if(rfork(RFFDG|RFPROC) == 0) { execl("/bin/rc", "rc", "9fs", ndump, nil); exits(0); } w = wait(); if(w == nil){ fprint(2, "history: wait error: %r\n"); exits("wait"); } if(w->msg[0] != '\0'){ fprint(2, "9fs failed: %s\n", w->msg); exits(w->msg); } free(w); } started = 0; dir = dirstat(file); if(dir == nil) fprint(2, "history: warning: %s does not exist\n", file); else{ print("%s %s %lld [%s]\n", prtime(dir->mtime), file, dir->length, dir->muid); started = 1; strecpy(pair[1], pair[1]+sizeof pair[1], file); } free(dir); otime = starttime(sflag); toggle = 0; for(;;) { lastbefore(otime, fil, buf, ndump); dir = dirstat(buf); if(dir == nil) { if(!force) return; dir = malloc(sizeof(Dir)); nulldir(dir); dir->mtime = otime + 1; } dt = HOUR(12); missing = 0; while(otime <= dir->mtime){ if(verb) print("backup %ld, %ld\n", dir->mtime, otime-dt); lastbefore(otime-dt, fil, buf, ndump); d = dirstat(buf); if(d == nil){ if(!force) return; if(!missing) print("removed %s\n", buf); missing = 1; }else{ free(dir); dir = d; } dt += HOUR(12); } strcpy(pair[toggle], buf); if(diff && started){ switch(rfork(RFFDG|RFPROC)){ case 0: dargv[ndargv] = pair[toggle]; dargv[ndargv+1] = pair[toggle ^ 1]; exec("/bin/diff", dargv); fprint(2, "can't exec diff: %r\n"); exits(0); case -1: fprint(2, "can't fork diff: %r\n"); break; default: while(waitpid() != -1) ; break; } } print("%s %s %lld [%s]\n", prtime(dir->mtime), buf, dir->length, dir->muid); toggle ^= 1; started = 1; otime = dir->mtime; free(dir); } } void lastbefore(ulong t, char *f, char *b, char *ndump) { Tm *tm; Dir *dir; int vers, try; ulong t0, mtime; int i, n, fd; t0 = t; if(verb) print("%ld lastbefore %s\n", t0, f); mtime = 0; for(try=0; try<30; try++) { tm = localtime(t); sprint(b, "/n/%s/%.4d/%.2d%.2d", ndump, tm->year+1900, tm->mon+1, tm->mday); dir = dirstat(b); if(dir){ mtime = dir->mtime; free(dir); } if(dir==nil || mtime > t0) { if(verb) print("%ld earlier %s\n", mtime, b); t -= HOUR(24); continue; } if(strstr(ndump, "snap")){ fd = open(b, OREAD); if(fd < 0) continue; n = dirreadall(fd, &dir); close(fd); if(n == 0) continue; for(i = n-1; i > 0; i--){ if(dir[i].mtime > t0) break; } sprint(b, "/n/%s/%.4d/%.2d%.2d/%s%s", ndump, tm->year+1900, tm->mon+1, tm->mday, dir[i].name, f); free(dir); } else { for(vers=0;; vers++) { sprint(b, "/n/%s/%.4d/%.2d%.2d%d", ndump, tm->year+1900, tm->mon+1, tm->mday, vers+1); dir = dirstat(b); if(dir){ mtime = dir->mtime; free(dir); } if(dir==nil || mtime > t0) break; if(verb) print("%ld later %s\n", mtime, b); } sprint(b, "/n/%s/%.4d/%.2d%.2d%s", ndump, tm->year+1900, tm->mon+1, tm->mday, f); if(vers) sprint(b, "/n/%s/%.4d/%.2d%.2d%d%s", ndump, tm->year+1900, tm->mon+1, tm->mday, vers, f); } return; } strcpy(b, "XXX"); /* error */ } char* prtime(ulong t) { static char buf[100]; char *b; Tm *tm; if(uflag) tm = gmtime(t); else tm = localtime(t); b = asctime(tm); memcpy(buf, b+4, 24); buf[24] = 0; return buf; } long starttime(char *s) { Tm *tm; long t, dt; int i, yr, mo, da; t = time(0); if(s == 0) return t; for(i=0; s[i]; i++) if(s[i] < '0' || s[i] > '9') { fprint(2, "bad start time: %s\n", s); return t; } if(strlen(s)==6){ yr = (s[0]-'0')*10 + s[1]-'0'; mo = (s[2]-'0')*10 + s[3]-'0' - 1; da = (s[4]-'0')*10 + s[5]-'0'; if(yr < 70) yr += 100; }else if(strlen(s)==8){ yr = (((s[0]-'0')*10 + s[1]-'0')*10 + s[2]-'0')*10 + s[3]-'0'; yr -= 1900; mo = (s[4]-'0')*10 + s[5]-'0' - 1; da = (s[6]-'0')*10 + s[7]-'0'; }else{ fprint(2, "bad start time: %s\n", s); return t; } t = 0; dt = YEAR(10); for(i=0; i<50; i++) { tm = localtime(t+dt); if(yr > tm->year || (yr == tm->year && mo > tm->mon) || (yr == tm->year && mo == tm->mon) && da > tm->mday) { t += dt; continue; } dt /= 2; if(dt == 0) break; } t += HOUR(12); /* .5 day to get to noon of argument */ return t; }