1 00:00:00,000 --> 00:00:08,560 Let's talk about CPIO. 2 00:00:08,560 --> 00:00:11,520 CPIO is an old archiving utility, 3 00:00:11,520 --> 00:00:13,120 comparable to TAR. 4 00:00:13,120 --> 00:00:15,120 It's not used a lot anymore, 5 00:00:15,120 --> 00:00:17,360 but the format is common and for that reason 6 00:00:17,360 --> 00:00:19,760 you need to know a bit about it anyway. 7 00:00:19,760 --> 00:00:22,879 CPIO works on an output list of files 8 00:00:22,879 --> 00:00:25,520 that need to be generated by another utility, 9 00:00:25,520 --> 00:00:27,760 like FIND or LS. 10 00:00:28,320 --> 00:00:30,879 In general, TAR is considered easier to use 11 00:00:30,879 --> 00:00:33,680 because it can take input files as arguments, 12 00:00:33,680 --> 00:00:36,320 while with CPIO you need to provide 13 00:00:36,320 --> 00:00:38,560 input files with another command. 14 00:00:40,320 --> 00:00:42,480 Let's have a look at some usage examples. 15 00:00:44,480 --> 00:00:46,400 So I'm going to show you LS. 16 00:00:47,279 --> 00:00:48,880 That's a common command, right? 17 00:00:48,880 --> 00:00:53,200 An LS followed by a pipe CPIO minus OV 18 00:00:53,919 --> 00:00:56,959 and that will create the backup on screen. 19 00:00:56,959 --> 00:00:58,400 Well, an on-screen backup, 20 00:00:58,400 --> 00:01:00,240 that's not very convenient 21 00:01:00,240 --> 00:01:03,119 and that is why I'm redirecting it 22 00:01:03,119 --> 00:01:06,320 to my archive dot CPIO. 23 00:01:06,879 --> 00:01:08,559 That is how you would normally use it. 24 00:01:09,360 --> 00:01:16,400 So an alternative is FIND dot minus depth minus print. 25 00:01:16,400 --> 00:01:18,080 That will find a couple of files 26 00:01:18,720 --> 00:01:24,959 and these files is what you can pipe to CPIO minus O. 27 00:01:25,680 --> 00:01:27,839 So again, CPIO minus O 28 00:01:27,839 --> 00:01:32,559 and you redirect the output to my archive 2 dot CPIO. 29 00:01:34,160 --> 00:01:36,800 Now, this FIND example shows something 30 00:01:36,800 --> 00:01:38,080 that is quite interesting. 31 00:01:38,639 --> 00:01:42,000 So for instance, you can use FIND slash minus name 32 00:01:43,120 --> 00:01:47,919 star dot txt to look for all txt files 33 00:01:47,919 --> 00:01:49,919 or whichever file you want to create. 34 00:01:50,480 --> 00:01:53,360 And then you use CPIO minus O 35 00:01:54,239 --> 00:01:56,160 minus minus format is star. 36 00:01:56,720 --> 00:02:00,080 This format is star is creating tar compatible format 37 00:02:00,800 --> 00:02:04,559 and then txt files dot tar. 38 00:02:06,080 --> 00:02:08,960 And that will create a tar file for you. 39 00:02:09,520 --> 00:02:13,119 Now, also convenient is the option to extract your CPIO. 40 00:02:13,679 --> 00:02:16,720 CPIO minus IDMV. 41 00:02:16,720 --> 00:02:18,240 That's a lot of options, 42 00:02:18,240 --> 00:02:20,880 but these options are what you typically use 43 00:02:20,880 --> 00:02:23,279 to extract your archive. 44 00:02:24,000 --> 00:02:25,839 And if you do that without typos, 45 00:02:25,839 --> 00:02:27,520 it might be working better. 46 00:02:28,080 --> 00:02:31,600 Now, here I'm getting some error message user 47 00:02:31,600 --> 00:02:34,639 not create newer or same age version exists. 48 00:02:34,639 --> 00:02:36,080 Yeah, that is correct 49 00:02:36,080 --> 00:02:38,160 because it has absolute file names 50 00:02:38,160 --> 00:02:41,520 and it tries to write the absolute file name. 51 00:02:41,520 --> 00:02:45,039 And that is something that you should be careful about. 52 00:02:45,039 --> 00:02:47,199 Doesn't overwrite it fortunately, 53 00:02:47,199 --> 00:02:48,639 so nothing has gone wrong. 54 00:02:49,199 --> 00:02:51,440 Now, CPIO is funny, 55 00:02:52,080 --> 00:02:53,839 particularly on a Red Hat system 56 00:02:53,839 --> 00:02:56,639 because Red Hat is using RPMs 57 00:02:56,639 --> 00:03:00,320 and an RPM archive is really a CPO archive 58 00:03:00,320 --> 00:03:02,240 with some metadata. 59 00:03:02,240 --> 00:03:04,000 So do we have any RPMs? 60 00:03:04,800 --> 00:03:08,800 Let's do a find on star RPM so that we can see. 61 00:03:08,800 --> 00:03:11,119 And oh my goodness, there's a lot of them. 62 00:03:11,759 --> 00:03:15,440 So I am going to do what? 63 00:03:15,440 --> 00:03:18,800 Well, I am going to copy var cache. 64 00:03:21,600 --> 00:03:25,759 Package kit 10 metadata upstream. 65 00:03:26,479 --> 00:03:28,479 That's my upstream repositories 66 00:03:28,479 --> 00:03:29,679 and I'm picking one of them, 67 00:03:29,679 --> 00:03:31,520 the builder RPM. 68 00:03:31,520 --> 00:03:32,880 I'm copying it to here 69 00:03:33,520 --> 00:03:37,360 and then I'm going to use RPM to CPIO 70 00:03:37,919 --> 00:03:41,119 on my builder dot whatever. 71 00:03:41,679 --> 00:03:45,039 And yeah, it's refusing to write it to a terminal. 72 00:03:45,039 --> 00:03:51,119 So let's call it builder dot CPIO. 73 00:03:52,399 --> 00:03:54,479 And now I have my CPIO file 74 00:03:54,479 --> 00:03:59,440 and there I can use CPIO minus IDMV 75 00:03:59,440 --> 00:04:04,000 on builder dot CPIO. 76 00:04:04,000 --> 00:04:05,600 Oh, I'm doing it the wrong way. 77 00:04:05,600 --> 00:04:08,479 I need my input redirection, of course. 78 00:04:08,479 --> 00:04:09,600 And as you can see, 79 00:04:09,600 --> 00:04:12,320 this has created a subdirectory structure 80 00:04:12,320 --> 00:04:13,759 in my current directory. 81 00:04:13,759 --> 00:04:16,799 You see that the user directory is right here. 82 00:04:16,799 --> 00:04:18,399 And in this user directory, 83 00:04:18,399 --> 00:04:21,440 I have all files that are coming from the RPM package. 84 00:04:21,440 --> 00:04:23,440 So if ever you need to fetch something 85 00:04:23,440 --> 00:04:25,519 directly from an RPM package, 86 00:04:25,519 --> 00:04:28,320 this can be a convenient way to do so.