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-rw-r--r--community/weblogs/tschwinge/2009-06-24_importing_from_gnu_arch_into_git.mdwn96
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+[[!meta copyright="Copyright © 2009 Free Software Foundation, Inc."]]
+
+[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
+is included in the section entitled [[GNU Free Documentation
+License|/fdl]]."]]"""]]
+
+[[!meta title="converting from GNU arch to Git -- without direct repository
+access"]]
+
+I wanted to import an old GNU arch repository into Git, but only had HTTP
+access via ArchZoom. I spent quite some time to try teaching `git archimport`
+to use HTTP access to that repository, but this didn't work out. Too bad --
+but at least, using ArchZoom, I was able to get the individual revisions'
+tarballs:
+
+ $ ls -1 *.tar.gz
+ bpf--devel--0.0--base-0.tar.gz
+ bpf--devel--0.0--patch-1.tar.gz
+ bpf--devel--0.0--patch-10.tar.gz
+ bpf--devel--0.0--patch-11.tar.gz
+ bpf--devel--0.0--patch-12.tar.gz
+ bpf--devel--0.0--patch-2.tar.gz
+ bpf--devel--0.0--patch-3.tar.gz
+ [...]
+ bpf--devel--0.0--patch-9.tar.gz
+ bpf--release--0.1--base-0.tar.gz
+ bpf--release--0.1--patch-1.tar.gz
+ bpf--release--0.1--patch-2.tar.gz
+ [...]
+ bpf--release--0.1--patch-8.tar.gz
+
+I unpacked these:
+
+ $ for f in *.tar.gz; do tar -xz < "$f" || echo >&2 "$f" failed; done
+
+The last revision's tree apparently contains all previous revisions' commit
+information (author, date, message), so use that:
+
+ $ cp -a ↩
+ bpf--release--0.1--patch-8/{arch}/bpf/bpf--devel/bpf--devel--0.0/info@hurdfr.org--hurdfr/patch-log ↩
+ d-patch-log
+ $ cp -a ↩
+ bpf--release--0.1--patch-8/{arch}/bpf/bpf--release/bpf--release--0.1/info@hurdfr.org--hurdfr/patch-log ↩
+ r-patch-log
+
+... and extract the information that we need:
+
+ $ base=bpf--devel--0.0-- && ↩
+ for f in d-patch-log/*; do ↩
+ grep < "$f" ^Creator: | head -n 1 ↩
+ | { read j c && ↩
+ echo "$c" | sed s%' <.*'%% ↩
+ > "$base""$(basename "$f")".author_name && ↩
+ echo "$c" | sed -e 's%.*<%%' -e 's%>.*%%' ↩
+ > "$base""$(basename "$f")".author_email; } && ↩
+ grep < "$f" ^Standard-date: | head -n 1 | { read j d && echo "$d" ↩
+ > "$base""$(basename "$f")".author_date; } && ↩
+ { grep < "$f" ^Summary: | head -n 1 | { read j m && echo "$m"; } && ↩
+ echo && sed < "$f" '1,/^$/d'; } ↩
+ > "$base""$(basename "$f")".log ↩
+ || echo >&2 "$f" failed; ↩
+ done
+ $ base=bpf--release--0.1-- && ↩
+ for f in r-patch-log/*; [...]
+
+(Of course, I could have used something more elaborate than shell scripting...)
+
+Remove the GNU arch stuff that we don't need anymore:
+
+ $ find bpf--*/ -type d \( -name {arch} -o -name .arch-ids \) -print0 ↩
+ | xargs -0 rm -r
+
+The `base-0` revisions are actually either empty (the `devel` one) or
+equivalent to the previous revision (the `release` one), so remove these:
+
+ $ rm -rf bpf--devel--0.0--base-0 bpf--release--0.1--base-0
+
+Finally, import all the other ones:
+
+ $ mkdir g && ( cd g/ && git init )
+ $ for d in bpf--d*-? bpf--d*-?? bpf--r*; do ↩
+ test -d "$d"/ || continue && ↩
+ ( cd g/ && ↩
+ rsync -a --delete --exclude=/.git ../"$d"/ ./ && ↩
+ git add . && ↩
+ GIT_AUTHOR_NAME="$(cat ../"$d".author_name)" ↩
+ GIT_AUTHOR_EMAIL="$(cat ../"$d".author_email)" ↩
+ GIT_AUTHOR_DATE="$(cat ../"$d".author_date)" ↩
+ git commit -F ../"$d".log -a ); ↩
+ done
+
+Voilà!