On 11/20/19 9:49 PM, Guillem Jover wrote: > Hi! > > On Wed, 2019-11-20 at 22:59:04 +0000, Alejandro Del Castillo wrote: >> I am the current maintainer of opkg, dpkg's little brother used mainly >> for embedded systems. > > Ah, thanks for getting in touch! :)
=) > >> Opkg uses dpkg control file syntax, and follows >> debian policy (for the most part). Recently, a bug [1] was opened >> against opkg regarding symlinks. Basically, debian policy states that >> symlinks should be followed, when installing files. But, empirically, I >> don't see that: >> >> (bb) adelcast@delcastillo2 ~/dpkg $ tree a_1.0 >> a_1.0 >> ├── DEBIAN >> │ └── control >> ├── myfile >> └── tmp >> ├── lib >> └── lib64 -> lib/ >> >> 4 directories, 2 files >> (bb) adelcast@delcastillo2 ~/dpkg $ tree b_1.0 >> b_1.0 >> ├── DEBIAN >> │ └── control >> ├── myfile2 >> └── tmp >> └── lib64 >> └── otherfile >> >> (bb) adelcast@delcastillo2 ~/dpkg $ sudo dpkg -i a_1.0.deb >> Selecting previously unselected package a. >> (Reading database ... 620831 files and directories currently installed.) >> Preparing to unpack a_1.0.deb ... >> Unpacking a (1.0) ... >> Setting up a (1.0) ... >> (bb) adelcast@delcastillo2 ~/dpkg $ sudo dpkg -i b_1.0.deb >> Selecting previously unselected package b. >> (Reading database ... 620834 files and directories currently installed.) >> Preparing to unpack b_1.0.deb ... >> Unpacking b (1.0) ... >> dpkg: error processing archive b_1.0.deb (--install): >> trying to overwrite '/tmp/lib64', which is also in package a 1.0 >> Errors were encountered while processing: >> b_1.0.deb >> >> Can someone clarify why dpkg is behaving this way? Or am I >> misinterpreting Debian standards? > > This is supposed to work, as exemplified by the following functional > test case: > > > https://urldefense.com/v3/__https://git.dpkg.org/cgit/dpkg/dpkg-tests.git/tree/t-symlink-dir__;!!FbZ0ZwI3Qg!59PE0ACeuyQPgkAbQXSPg-Y6YxcGclN7HzWI--UmMsEKm_kR6DpZaLBscqsn50S7M9HD6w$ > I was pretty mystified on what's different...then I realized that the issue only happens when following symlinks on tmpfs (/tmp). Adding an extra directory (tmp) to the dpkg-test example reproduces the failure. At the end of the email, I have a patch that modifies the tests to show the failure (I tried attaching the patch to the email, but that made the list bot swallow my message). Is this a know issue or expected behavior? > Are you sure the contents of these packages are what's expected? > «dpkg-deb -c» would be more telling instead of tree on the unpacked > directory. Or perhaps the pathname on disk was neither a directory > nor a symlink? > > Otherwise I guess placing the exact test packages somewhere might > help, or you could check with «dpkg --debug=111». > > Thanks, > Guillem > From c5c86a3cb21ea58fe1656e04f7ff080b78718645 Mon Sep 17 00:00:00 2001 From: Alejandro del Castillo <[email protected]> Date: Thu, 21 Nov 2019 23:03:44 +0000 Subject: [PATCH] dpkg-tests: add tmp directory to dir hierarchy Signed-off-by: Alejandro del Castillo <[email protected]> --- t-symlink-dir/pkg-dir-real/{ => tmp}/test-dir/file-dir | 0 t-symlink-dir/pkg-dir-symlink-0/{ => tmp}/file-symlink | 0 t-symlink-dir/pkg-dir-symlink-0/{ => tmp}/test-symlink | 0 t-symlink-dir/pkg-dir-symlink-1/{ => tmp}/file-symlink | 0 t-symlink-dir/pkg-dir-symlink-1/{ => tmp}/test-symlink | 0 t-symlink-dir/pkg-file/DEBIAN/conffiles | 2 +- t-symlink-dir/pkg-file/{ => tmp}/test-symlink/file-file | 0 7 files changed, 1 insertion(+), 1 deletion(-) rename t-symlink-dir/pkg-dir-real/{ => tmp}/test-dir/file-dir (100%) rename t-symlink-dir/pkg-dir-symlink-0/{ => tmp}/file-symlink (100%) rename t-symlink-dir/pkg-dir-symlink-0/{ => tmp}/test-symlink (100%) rename t-symlink-dir/pkg-dir-symlink-1/{ => tmp}/file-symlink (100%) rename t-symlink-dir/pkg-dir-symlink-1/{ => tmp}/test-symlink (100%) rename t-symlink-dir/pkg-file/{ => tmp}/test-symlink/file-file (100%) diff --git a/t-symlink-dir/pkg-dir-real/test-dir/file-dir b/t-symlink-dir/pkg-dir-real/tmp/test-dir/file-dir similarity index 100% rename from t-symlink-dir/pkg-dir-real/test-dir/file-dir rename to t-symlink-dir/pkg-dir-real/tmp/test-dir/file-dir diff --git a/t-symlink-dir/pkg-dir-symlink-0/file-symlink b/t-symlink-dir/pkg-dir-symlink-0/tmp/file-symlink similarity index 100% rename from t-symlink-dir/pkg-dir-symlink-0/file-symlink rename to t-symlink-dir/pkg-dir-symlink-0/tmp/file-symlink diff --git a/t-symlink-dir/pkg-dir-symlink-0/test-symlink b/t-symlink-dir/pkg-dir-symlink-0/tmp/test-symlink similarity index 100% rename from t-symlink-dir/pkg-dir-symlink-0/test-symlink rename to t-symlink-dir/pkg-dir-symlink-0/tmp/test-symlink diff --git a/t-symlink-dir/pkg-dir-symlink-1/file-symlink b/t-symlink-dir/pkg-dir-symlink-1/tmp/file-symlink similarity index 100% rename from t-symlink-dir/pkg-dir-symlink-1/file-symlink rename to t-symlink-dir/pkg-dir-symlink-1/tmp/file-symlink diff --git a/t-symlink-dir/pkg-dir-symlink-1/test-symlink b/t-symlink-dir/pkg-dir-symlink-1/tmp/test-symlink similarity index 100% rename from t-symlink-dir/pkg-dir-symlink-1/test-symlink rename to t-symlink-dir/pkg-dir-symlink-1/tmp/test-symlink diff --git a/t-symlink-dir/pkg-file/DEBIAN/conffiles b/t-symlink-dir/pkg-file/DEBIAN/conffiles index 551fc78..82a12cc 100644 --- a/t-symlink-dir/pkg-file/DEBIAN/conffiles +++ b/t-symlink-dir/pkg-file/DEBIAN/conffiles @@ -1 +1 @@ -/test-symlink/file-file +/tmp/test-symlink/file-file diff --git a/t-symlink-dir/pkg-file/test-symlink/file-file b/t-symlink-dir/pkg-file/tmp/test-symlink/file-file similarity index 100% rename from t-symlink-dir/pkg-file/test-symlink/file-file rename to t-symlink-dir/pkg-file/tmp/test-symlink/file-file -- 2.11.0 -- Cheers, Alejandro
