1/* 2 * Check-out files from the "current cache directory" 3 * 4 * Copyright (C) 2005 Linus Torvalds 5 * 6 * Careful: order of argument flags does matter. For example, 7 * 8 * checkout-cache -a -f file.c 9 * 10 * Will first check out all files listed in the cache (but not 11 * overwrite any old ones), and then force-checkout "file.c" a 12 * second time (ie that one _will_ overwrite any old contents 13 * with the same filename). 14 * 15 * Also, just doing "checkout-cache" does nothing. You probably 16 * meant "checkout-cache -a". And if you want to force it, you 17 * want "checkout-cache -f -a". 18 * 19 * Intuitiveness is not the goal here. Repeatability is. The 20 * reason for the "no arguments means no work" thing is that 21 * from scripts you are supposed to be able to do things like 22 * 23 * find . -name '*.h' -print0 | xargs -0 checkout-cache -f -- 24 * 25 * which will force all existing *.h files to be replaced with 26 * their cached copies. If an empty command line implied "all", 27 * then this would force-refresh everything in the cache, which 28 * was not the point. 29 * 30 * Oh, and the "--" is just a good idea when you know the rest 31 * will be filenames. Just so that you wouldn't have a filename 32 * of "-a" causing problems (not possible in the above example, 33 * but get used to it in scripting!). 34 */ 35#include"cache.h" 36 37static int force =0, quiet =0; 38 39static intwrite_entry(struct cache_entry *ce) 40{ 41int fd; 42void*new; 43unsigned long size; 44long wrote; 45 46new=read_sha1_file(ce->sha1,"blob", &size); 47if(!new) { 48fprintf(stderr,"checkout-cache: unable to read sha1 file of%s(%s)\n", 49 ce->name,sha1_to_hex(ce->sha1)); 50return-1; 51} 52 fd =open(ce->name, O_WRONLY | O_CREAT | O_TRUNC,0600); 53if(fd <0) { 54fprintf(stderr,"checkout-cache: unable to create%s(%s)\n", 55 ce->name,strerror(errno)); 56free(new); 57return-1; 58} 59 wrote =write(fd,new, size); 60close(fd); 61free(new); 62if(wrote == size) 63return0; 64fprintf(stderr,"checkout-cache: unable to write%s\n", ce->name); 65return-1; 66} 67 68static intcheckout_entry(struct cache_entry *ce) 69{ 70if(!force) { 71struct stat st; 72 73if(!stat(ce->name, &st)) { 74unsigned changed =cache_match_stat(ce, &st); 75if(changed && !quiet) 76fprintf(stderr,"checkout-cache:%salready exists\n", ce->name); 77return0; 78} 79} 80returnwrite_entry(ce); 81} 82 83static intcheckout_file(const char*name) 84{ 85int pos =cache_name_pos(name,strlen(name)); 86if(pos <0) { 87if(!quiet) 88fprintf(stderr,"checkout-cache:%sis not in the cache\n", name); 89return-1; 90} 91returncheckout_entry(active_cache[pos]); 92} 93 94static intcheckout_all(void) 95{ 96int i; 97 98for(i =0; i < active_nr ; i++) { 99struct cache_entry *ce = active_cache[i]; 100if(checkout_entry(ce) <0) 101return-1; 102} 103return0; 104} 105 106intmain(int argc,char**argv) 107{ 108int i, force_filename =0; 109 110if(read_cache() <0) { 111fprintf(stderr,"Invalid cache\n"); 112exit(1); 113} 114 115for(i =1; i < argc; i++) { 116const char*arg = argv[i]; 117if(!force_filename) { 118if(!strcmp(arg,"-a")) { 119checkout_all(); 120continue; 121} 122if(!strcmp(arg,"--")) { 123 force_filename =1; 124continue; 125} 126if(!strcmp(arg,"-f")) { 127 force =1; 128continue; 129} 130if(!strcmp(arg,"-q")) { 131 quiet =1; 132continue; 133} 134} 135checkout_file(arg); 136} 137return0; 138}