initial report on hardlink in thin mode

diff --git a/doc/bugs/annex.hardlink_is_not___34__in_effect__34___in_thin_mode_.mdwn b/doc/bugs/annex.hardlink_is_not___34__in_effect__34___in_thin_mode_.mdwn
new file mode 100644 (file)
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+++ b/doc/bugs/annex.hardlink_is_not___34__in_effect__34___in_thin_mode_.mdwn
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+### Please describe the problem.
+
+the goal was to have files unlocked (no symlinks) and gain "efficient" clone which would not consume more space through hardlinks.
+But if mode is thin in the clone - we get a copy within the clone
+
+### What steps will reproduce the problem?
+
+[[!format sh """
+
+#!/bin/bash
+
+export PS4='> '
+set -x
+set -eu
+cd "$(mktemp -d ${TMPDIR:-/tmp}/dl-XXXXXXX)"
+
+git annex version | head -n 1
+(
+mkdir src
+cd src
+git init
+git annex init
+git commit --allow-empty -m empty
+
+git annex adjust --unlock
+git config annex.thin true
+
+touch 123 
+git annex add 123
+git commit -m 123 123
+)
+
+git clone --shared src dest
+
+(
+cd dest
+# without it it would stall in "get" call 
+# https://git-annex.branchable.com/bugs/get_is_stuck_unless_a_clone_was_previously_explicitly___34__annex_init__34__ed/
+git annex init
+git config annex.thin true
+git annex get 123
+)
+
+: are inodes the same?
+ls -lLi {dest,src}/{123,.git/annex/objects/*/*/*/*}
+"""]]
+
+
+### Please provide any additional information below.
+
+[[!format sh """
+$> bash check-annex-thin-hardlink.sh
+> set -eu
+>> mktemp -d /home/yoh/.tmp/dl-XXXXXXX
+> cd /home/yoh/.tmp/dl-je8JzWt
+> git annex version
+> head -n 1
+git-annex version: 8.20200810+git47-g27329f0bb-1~ndall+1
+> mkdir src
+> cd src
+> git init
+Initialized empty Git repository in /home/yoh/.tmp/dl-je8JzWt/src/.git/
+> git annex init
+init  (scanning for unlocked files...)
+ok
+(recording state in git...)
+> git commit --allow-empty -m empty
+[master (root-commit) be447d9] empty
+> git annex adjust --unlock
+adjust 
+Switched to branch 'adjusted/master(unlocked)'
+ok
+> git config annex.thin true
+> touch 123
+> git annex add 123
+add 123 
+ok
+(recording state in git...)
+> git commit -m 123 123
+[adjusted/master(unlocked) c5db915] 123
+ 1 file changed, 1 insertion(+)
+ create mode 100644 123
+> git clone --shared src dest
+Cloning into 'dest'...
+done.
+> cd dest
+> git annex init
+init  (merging origin/git-annex into git-annex...)
+(recording state in git...)
+(scanning for unlocked files...)
+
+  Repository was cloned with --shared; setting annex.hardlink=true and making repository untrusted.
+ok
+(recording state in git...)
+> git config annex.thin true
+> git annex get 123
+get 123 (from origin...) 
+(checksum...) ok
+(recording state in git...)
+> : are inodes the 'same?'
+> ls -lLi dest/123 dest/.git/annex/objects/pX/ZJ/SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 src/123 src/.git/annex/objects/pX/ZJ/SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+49711952 -rw------- 2 yoh yoh 0 Aug 25 11:04 dest/123
+49711952 -rw------- 2 yoh yoh 0 Aug 25 11:04 dest/.git/annex/objects/pX/ZJ/SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+49711742 -rw------- 2 yoh yoh 0 Aug 25 11:04 src/123
+49711742 -rw------- 2 yoh yoh 0 Aug 25 11:04 src/.git/annex/objects/pX/ZJ/SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+
+"""]]
+
+[[!meta author=yoh]]
+[[!tag projects/datalad]]