From 26490ed06fade8a1bc1dedc1cf951068ece4df49 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20W=C3=A4ckerlin?= <marc@merkur.int.swisssign.net>
Date: Tue, 10 Apr 2018 16:08:55 +0200
Subject: [PATCH] initial

---
 svn-to-git | 208 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 208 insertions(+)
 create mode 100755 svn-to-git

diff --git a/svn-to-git b/svn-to-git
new file mode 100755
index 0000000..0121b3d
--- /dev/null
+++ b/svn-to-git
@@ -0,0 +1,208 @@
+#!/bin/bash -e
+
+############################################################################ begin logging
+# check if stdout is a terminal...
+if test -t 1; then
+
+    # see if it supports colors...
+    ncolors=$(tput colors)
+
+    if test -n "$ncolors" && test $ncolors -ge 8; then
+        bold="$(tput bold)"
+        underline="$(tput smul)"
+        standout="$(tput smso)"
+        normal="$(tput sgr0)"
+        black="$(tput setaf 0)"
+        red="$(tput setaf 1)"
+        green="$(tput setaf 2)"
+        yellow="$(tput setaf 3)"
+        blue="$(tput setaf 4)"
+        magenta="$(tput setaf 5)"
+        cyan="$(tput setaf 6)"
+        white="$(tput setaf 7)"
+    fi
+fi
+
+append_msg() {
+    if test $# -ne 0; then
+        echo -n ": ${bold}$*"
+    fi
+    echo "${normal}"
+}
+
+# write a message
+message() {
+    if test $# -eq 0; then
+        return
+    fi
+    echo "${bold}${white}$*${normal}" 1>&2
+}
+
+# write a success message
+success() {
+    echo -n "${bold}${green}success" 1>&2
+    append_msg $* 1>&2
+}
+
+# write a notice
+notice() {
+    echo -n "${bold}${yellow}notice" 1>&2
+    append_msg $* 1>&2
+}
+
+# write a warning message
+warning() {
+    echo -en "${bold}${red}warning" 1>&2
+    append_msg $* 1>&2
+}
+
+# write error message
+error() {
+    echo -en "${bold}${red}error" 1>&2
+    append_msg $* 1>&2
+}
+
+# run a command, print the result and abort in case of error
+# option: --ignore: ignore the result, continue in case of error
+run() {
+    ignore=1
+    while test $# -gt 0; do
+        case "$1" in
+            (--ignore) ignore=0;;
+            (*) break;;
+        esac
+        shift;
+    done
+    echo -n "${bold}${yellow}running:${white} $*${normal} … "
+    set +e
+    result=$($* 2>&1)
+    res=$?
+    set -e
+    if test $res -ne 0; then
+        if test $ignore -eq 1; then
+            error "failed with return code: $res"
+            if test -n "$result"; then
+                echo "$result"
+            fi
+            exit 1
+        else
+            warning "ignored return code: $res"
+        fi
+    else
+        success
+    fi
+}
+
+############################################################################ error handler
+function traperror() {
+    set +x
+    local err=($1) # error status
+    local line="$2" # LINENO
+    local linecallfunc="$3"
+    local command="$4"
+    local funcstack="$5"
+    IFS=" "
+    for e in ${err[@]}; do
+        if test -n "$e" -a "$e" != "0"; then
+            error "line $line - command '$command' exited with status: $e (${err[@]})"
+            if [ "${funcstack}" != "main" -o "$linecallfunc" != "0" ]; then
+                echo -n "   ... error at ${funcstack} " 1>&2
+                if [ "$linecallfunc" != "" ]; then
+                    echo -n "called at line $linecallfunc" 1>&2
+                fi
+                echo
+            fi
+            exit $e
+        fi
+    done
+    success
+    exit 0
+}
+
+# catch errors
+trap 'traperror "$? ${PIPESTATUS[@]}" $LINENO $BASH_LINENO "$BASH_COMMAND" "${FUNCNAME[@]}" "${FUNCTION}"' ERR SIGINT INT TERM EXIT
+
+
+
+######################################################### commandline parameter evaluation
+while test $# -gt 0; do
+    case "$1" in
+        (--help|-h) less <<EOF
+SYNOPSIS
+
+  $0 [OPTIONS]
+
+OPTIONS
+
+  --help, -h                 show this help
+
+DESCRIPTION
+
+EOF
+            exit;;
+        (*) error "unknow option $1, try $0 --help"; exit 1;;
+    esac
+    if test $# -eq 0; then
+        error "missing parameter, try $0 --help"; exit 1
+    fi
+    shift;
+done
+
+##################################################################################### Main
+
+function createusers() {
+    tmpdir="/tmp/old-svn-${gittarget}"
+    svn co "$svnurl" "$tmpdir"
+    cd "$tmpdir"
+    svn log -q | \
+	awk -F '|' \
+	    '/^r/ {sub("^ ", "", $2); sub(" $", "", $2); print $2" = "$2" <"$2">"}' | \
+	sort -u > "$users"
+    cd -
+    rm -rf "$tmpdir"
+}
+
+users=users.txt
+options=("--authors-file=$users" "--no-metadata" "--prefix" "" "-s")
+svnurl="$1"
+giturl="$2"
+gittarget="${svnurl##*/}"
+if ! test -f "$users"; then
+    createusers
+fi
+
+# migration according to
+# https://git-scm.com/book/en/v2/Git-and-Other-Systems-Migrating-to-Git
+
+# one-way clone subversion repository
+run git svn clone "${options[@]}" "$svnurl" "$gittarget"
+cd "$gittarget"
+
+# move the tags to be proper git tags
+for t in $(git for-each-ref --format='%(refname:short)' refs/remotes/tags); do
+    run git tag ${t/tags\//} $t && git branch -D -r $t
+done
+
+# move the rest of the references under refs/remotes to be local branches
+for b in $(git for-each-ref --format='%(refname:short)' refs/remotes); do
+    run git branch $b refs/remotes/$b && git branch -D -r $b
+done
+
+# remove peg-revisions
+for p in $(git for-each-ref --format='%(refname:short)' | grep @); do
+    run git branch -D $p
+done
+
+# remove extra trunk branch
+run git branch -d trunk
+
+# add new remote repository
+run git remote add origin "$giturl"
+
+run git push origin --all
+run git push origin --tags
+
+# checkout fresh git repository
+cd -
+run rm -rf "$gittarget"
+run git clone "$giturl" "$gittarget"