563 lines
12 KiB
Bash
Executable file
563 lines
12 KiB
Bash
Executable file
#!/bin/sh
|
|
|
|
# git-remote-gcrypt
|
|
# Copyright 2013 by Ulrik
|
|
# License: GPLv2 or any later version, see http://www.gnu.org/licenses/
|
|
#
|
|
# See README
|
|
|
|
#set -x
|
|
set -e
|
|
|
|
Did_find_repo= # yes for connected, no for no repo
|
|
Localdir="${GIT_DIR:-.git}/remote-gcrypt"
|
|
export GITCEPTION="$GITCEPTION+" # Reuse $Gref except when stacked
|
|
Gref="refs/gcrypt/gitception$GITCEPTION"
|
|
Gref_rbranch="refs/heads/master"
|
|
Repoid=
|
|
Packpfx="pack :SHA224:"
|
|
|
|
# compat/utility functions
|
|
xecho()
|
|
{
|
|
cat <<EOF
|
|
$@
|
|
EOF
|
|
}
|
|
xecho_n() { xecho "$@" | tr -d \\n ; } # kill newlines
|
|
echo_git() { xecho "$@" ; } # Code clarity
|
|
echo_info() { xecho "gcrypt:" "$@" >&2; }
|
|
echo_die() { echo_info "$@" ; exit 1; }
|
|
|
|
isnull() { case "${1}" in "") true;; *) false;; esac; }
|
|
isnonnull() { ! isnull "$1"; }
|
|
iseq() { isnull "${1#"$2"}"; }
|
|
isnoteq() { ! iseq "$@"; }
|
|
|
|
# Append $2 to $1 with a newline separator
|
|
append() { isnull "$1" || xecho "$1" && xecho "$2"; }
|
|
isurl() { isnull "${2%%$1://*}"; }
|
|
|
|
xgrep() { command grep "$@" || : ; }
|
|
sort_C() { LC_ALL=C command sort "$@"; }
|
|
sort_stable_k2()
|
|
{
|
|
awk '{ printf("%08d %s\n", NR, $0) }' | sort_C -k3,3 -k1,1 |
|
|
awk '{ print $2 " " $3 }'
|
|
}
|
|
|
|
tac() { sed '1!G;h;$!d'; }
|
|
|
|
# Split $1 into $prefix_:$suffix_
|
|
splitcolon()
|
|
{
|
|
prefix_=${1%%:*}
|
|
suffix_=${1#*:}
|
|
}
|
|
|
|
## gitception part
|
|
# Fetch giturl $1, file $2
|
|
gitception_get()
|
|
{
|
|
# Take care to preserve FETCH_HEAD
|
|
local ret_=: obj_id= f_head="$GIT_DIR/FETCH_HEAD"
|
|
[ -e "$f_head" ] && command mv -f "$f_head" "$f_head.$$~" || :
|
|
git fetch -q -f "$1" "$Gref_rbranch:$Gref" 2>/dev/tty >/dev/null &&
|
|
obj_id="$(git ls-tree "$Gref" | xgrep -E '\b'"$2"'$' | awk '{print $3}')" &&
|
|
isnonnull "$obj_id" && git cat-file blob "$obj_id" && ret_=: ||
|
|
{ ret_=false && : ; }
|
|
[ -e "$f_head.$$~" ] && command mv -f "$f_head.$$~" "$f_head" || :
|
|
$ret_
|
|
}
|
|
|
|
anon_commit()
|
|
{
|
|
GIT_AUTHOR_NAME="root" GIT_AUTHOR_EMAIL="root@localhost" \
|
|
GIT_AUTHOR_DATE="1356994801 -0400" GIT_COMMITTER_NAME="root" \
|
|
GIT_COMMITTER_EMAIL="root@localhost" \
|
|
GIT_COMMITTER_DATE="1356994801 -0400" \
|
|
git commit-tree -m x "$@"
|
|
}
|
|
|
|
# Get 'tree' from $1, change file $2 to obj id $3
|
|
update_tree()
|
|
{
|
|
local tab_=" "
|
|
# $2 is a filename from the repo format
|
|
(git ls-tree "$1" | xgrep -v -E '\b'"$2"'$';
|
|
xecho "100644 blob $3$tab_$2") | git mktree
|
|
}
|
|
|
|
# Put giturl $1, file $2
|
|
# depends on previous GET to set $Gref and depends on PUT_FINAL later
|
|
gitception_put()
|
|
{
|
|
local obj_id= tree_id= commit_id=
|
|
obj_id=$(git hash-object -w --stdin) &&
|
|
tree_id=$(update_tree "$Gref" "$2" "$obj_id") &&
|
|
commit_id=$(anon_commit "$tree_id") &&
|
|
git update-ref "$Gref" "$commit_id"
|
|
}
|
|
|
|
gitception_new_repo()
|
|
{
|
|
local empty_tree=4b825dc642cb6eb9a060e54bf8d69288fbee4904
|
|
# get any file to update Gref, and if it's not updated we create empty
|
|
git update-ref -d "$Gref" || :
|
|
gitception_get "$1" "x" || :
|
|
git rev-parse -q --verify "$Gref" >/dev/null && return 0 ||
|
|
commit_id=$(anon_commit "$empty_tree") &&
|
|
git update-ref "$Gref" "$commit_id"
|
|
}
|
|
## end gitception
|
|
|
|
# Fetch repo $1, file $2
|
|
GET()
|
|
{
|
|
if isurl ssh "$1"
|
|
then
|
|
splitcolon "${1#ssh://}"
|
|
(exec 0>&-; ssh "$prefix_" "cat $suffix_/$2")
|
|
elif isurl sftp "$1"
|
|
then
|
|
(exec 0>&-; curl -s -S -k "$1/$2")
|
|
elif isurl gitception "$1"
|
|
then
|
|
gitception_get "${1#gitception://}" "$2"
|
|
else
|
|
cat "$1/$2"
|
|
fi
|
|
}
|
|
|
|
# Put repo $1, file $2 or fail
|
|
PUT()
|
|
{
|
|
if isurl ssh "$1"
|
|
then
|
|
splitcolon "${1#ssh://}"
|
|
ssh "$prefix_" "cat > $suffix_/$2"
|
|
elif isurl sftp "$1"
|
|
then
|
|
curl -s -S -k --ftp-create-dirs -T - "$1/$2"
|
|
elif isurl gitception "$1"
|
|
then
|
|
gitception_put "${1#gitception://}" "$2"
|
|
else
|
|
cat > "$1/$2"
|
|
fi
|
|
}
|
|
|
|
# Put all PUT changes for repo $1 at once
|
|
PUT_FINAL()
|
|
{
|
|
if isurl gitception "$1"
|
|
then
|
|
git push --quiet -f "${1#gitception://}" "$Gref:$Gref_rbranch"
|
|
else
|
|
:
|
|
fi
|
|
}
|
|
|
|
# Put directory for repo $1
|
|
PUTREPO()
|
|
{
|
|
if isurl ssh "$1"
|
|
then
|
|
splitcolon "${1#ssh://}"
|
|
(exec 0>&- ; ssh "$prefix_" "mkdir -p $suffix_")
|
|
elif isurl sftp "$1"
|
|
then
|
|
:
|
|
elif isurl gitception "$1"
|
|
then
|
|
gitception_new_repo "${1#gitception://}"
|
|
else
|
|
mkdir -p "$1"
|
|
fi
|
|
}
|
|
|
|
CLEAN_FINAL()
|
|
{
|
|
isurl gitception "$1" && git update-ref -d "$Gref" || :
|
|
}
|
|
|
|
ENCRYPT()
|
|
{
|
|
gpg --batch --force-mdc --compress-algo none \
|
|
--passphrase-fd 3 -c 3<<EOF
|
|
$Masterkey
|
|
EOF
|
|
}
|
|
|
|
DECRYPT()
|
|
{
|
|
gpg -q --batch --no-default-keyring --secret-keyring /dev/null \
|
|
--keyring /dev/null \
|
|
--passphrase-fd 3 -d 3<<EOF
|
|
$Masterkey
|
|
EOF
|
|
}
|
|
|
|
# Encrypt to recipients $1
|
|
PRIVENCRYPT()
|
|
{
|
|
gpg --no-default-keyring --keyring "$Conf_keyring" \
|
|
--compress-algo none -se $1
|
|
}
|
|
|
|
PRIVDECRYPT()
|
|
{
|
|
local status_=
|
|
exec 4>&1 &&
|
|
status_=$(gpg --no-default-keyring --keyring "$Conf_keyring" \
|
|
--status-fd 3 -q -d 3>&1 1>&4) &&
|
|
xecho "$status_" | grep "^\[GNUPG:\] ENC_TO " >/dev/null &&
|
|
(xecho "$status_" | grep "^\[GNUPG:\] GOODSIG " >/dev/null || {
|
|
echo_info "Failed to verify manifest signature!" && return 1
|
|
})
|
|
}
|
|
|
|
# Generate $1 random bytes
|
|
genkey()
|
|
{
|
|
gpg --armor --gen-rand 1 "$1"
|
|
}
|
|
|
|
pack_hash()
|
|
{
|
|
local hash_=
|
|
hash_=$(gpg --with-colons --print-md SHA224 | tr A-F a-f)
|
|
hash_=${hash_#:*:}
|
|
xecho "${hash_%:}"
|
|
}
|
|
|
|
# Pass the branch/ref by pipe to git
|
|
safe_git_rev_parse()
|
|
{
|
|
local out_=
|
|
out_=$(xecho "$1" | git cat-file --batch-check)
|
|
out_=${out_%%*missing}
|
|
xecho "${out_%% *}"
|
|
}
|
|
|
|
check_recipients()
|
|
{
|
|
Recipients="$(gpg --no-default-keyring --keyring "$Conf_keyring" \
|
|
--with-colons -k | xgrep ^pub | cut -f5 -d: | tr '\n' ' ')"
|
|
# Split recipients by space, example "a b c" => -R a -R b -R c
|
|
Recipients=$(xecho_n "$Recipients" | sed -e 's/\([^ ]\+\)/-R &/g')
|
|
if isnull "$Recipients"
|
|
then
|
|
echo_info "You must configure a keyring for the repository."
|
|
echo_info "Use ::"
|
|
echo_info " gpg --export KEYID1 > <path-to-keyring>"
|
|
echo_info " git config gcrypt.keyring <path-to-keyring>"
|
|
exit 1
|
|
fi
|
|
}
|
|
|
|
make_new_repo()
|
|
{
|
|
local urlid_= fix_config=
|
|
echo_info "Setting up new repository at $URL"
|
|
PUTREPO "$URL"
|
|
Masterkey="$(genkey 128)"
|
|
|
|
# We need a relatively short ID for URL+REPO
|
|
# The manifest will be stored at SHA224(urlid_)
|
|
# Needed assumption: the same user should have no duplicate urlid_
|
|
# For now, we arbitrarily use 9 random bytes (72 bits)
|
|
urlid_=$(genkey 9 | tr '/+' 'Zz')
|
|
Repoid=$(xecho_n "$urlid_" | pack_hash)
|
|
echo_info "Repository ID is" "$urlid_"
|
|
isnoteq "${NAME#gcrypt::}" "$URL" && {
|
|
git config "remote.$NAME.url" "gcrypt::$URL/G/$urlid_"
|
|
fix_config=1
|
|
} || :
|
|
echo_info "Repository URL is" "gcrypt::$URL/G/$urlid_"
|
|
isnonnull "$fix_config" && echo_info "(configuration for $NAME updated)"||:
|
|
}
|
|
|
|
|
|
read_config()
|
|
{
|
|
Conf_keyring=$(git config --path gcrypt.keyring || xecho "/dev/null")
|
|
}
|
|
|
|
ensure_connected()
|
|
{
|
|
local manifest_= rcv_repoid= url_id=
|
|
|
|
if isnonnull "$Did_find_repo"
|
|
then
|
|
return
|
|
fi
|
|
Did_find_repo=no
|
|
read_config
|
|
|
|
# split out Repoid from URL
|
|
url_id=${URL##*/G/}
|
|
iseq "$url_id" "$URL" && url_id= && return 0 || :
|
|
|
|
URL=${URL%/G/"$url_id"}
|
|
Repoid=$(xecho_n "$url_id" | pack_hash)
|
|
|
|
TmpManifest_Enc="$Localdir/manifest.$$"
|
|
trap 'rm -f "$TmpManifest_Enc"' EXIT
|
|
GET "$URL" "$Repoid" 2>/dev/null > "$TmpManifest_Enc" ||
|
|
echo_die "Repository not found: $url_id at $URL"
|
|
|
|
Did_find_repo=yes
|
|
echo_info "Decrypting manifest"
|
|
manifest_=$(PRIVDECRYPT < "$TmpManifest_Enc") &&
|
|
isnonnull "$manifest_" || {
|
|
echo_info "Failed to decrypt manifest!"
|
|
echo_info "Using keyring $Conf_keyring"
|
|
if iseq "$Conf_keyring" "/dev/null"
|
|
then
|
|
echo_info "NOTE: Please configure gcrypt.keyring"
|
|
fi
|
|
exit 1
|
|
}
|
|
rm -f "$TmpManifest_Enc"
|
|
trap - EXIT
|
|
|
|
Masterkey=$(xecho "$manifest_" | head -n 1)
|
|
Branchlist=$(xecho "$manifest_" | xgrep -E '^[0-9a-f]{40} ')
|
|
Packlist=$(xecho "$manifest_" | xgrep "^$Packpfx")
|
|
rcv_repoid=$(xecho "$manifest_" | xgrep "^repo ")
|
|
iseq "repo $Repoid" "$rcv_repoid" ||
|
|
echo_die "Repository id mismatch!"
|
|
}
|
|
|
|
do_capabilities()
|
|
{
|
|
echo_git fetch
|
|
echo_git push
|
|
echo_git
|
|
}
|
|
|
|
do_list()
|
|
{
|
|
local obj_id= ref_name= line_=
|
|
ensure_connected
|
|
|
|
xecho "$Branchlist" | while read line_
|
|
do
|
|
isnull "$line_" && break || :
|
|
obj_id=${line_%% *}
|
|
ref_name=${line_##* }
|
|
echo_git "$obj_id" "$ref_name"
|
|
if iseq "$ref_name" "refs/heads/master"
|
|
then
|
|
echo_git "@refs/heads/master HEAD"
|
|
fi
|
|
done
|
|
|
|
# end with blank line
|
|
echo_git
|
|
}
|
|
|
|
do_fetch()
|
|
{
|
|
# Security protocol:
|
|
# The PACK id is the SHA-1 of the encrypted git packfile.
|
|
# We only download packs mentioned in the encrypted manifest,
|
|
# and check their digest when received.
|
|
local pack_= rcv_id= packline_= pneed_= pboth_= phave_=
|
|
|
|
ensure_connected
|
|
|
|
if isnull "$Packlist"
|
|
then
|
|
echo_git # end with blank line
|
|
return
|
|
fi
|
|
|
|
TmpPack_Encrypted="$Localdir/tmp_pack_ENCRYPTED_.$$"
|
|
trap 'rm -f "$TmpPack_Encrypted"' EXIT
|
|
|
|
# Needed packs is Packlist - (phave & Packlist)
|
|
# The `+` for $GITCEPTION is pointless but we will be safe for stacking
|
|
phave_="$(cat "$Localdir/have_packs+" 2>/dev/null || :)"
|
|
pboth_="$( (xecho "$Packlist"; xecho "$phave_") | sort_C | uniq -d)"
|
|
pneed_="$( (xecho "$Packlist"; xecho "$pboth_") | sort_C | uniq -u)"
|
|
|
|
xecho "$pneed_" | while read packline_
|
|
do
|
|
isnull "$packline_" && continue || :
|
|
pack_=${packline_#"$Packpfx"}
|
|
rcv_id="$(GET "$URL" "$pack_" | \
|
|
tee "$TmpPack_Encrypted" | pack_hash)"
|
|
if isnoteq "$rcv_id" "$pack_"
|
|
then
|
|
echo_die "Packfile $pack_ does not match digest!"
|
|
fi
|
|
DECRYPT < "$TmpPack_Encrypted" |
|
|
git index-pack -v --stdin >/dev/null
|
|
# add to local pack list
|
|
xecho "$Packpfx$pack_" >> "$Localdir/have_packs$GITCEPTION"
|
|
done
|
|
|
|
rm -f "$TmpPack_Encrypted"
|
|
trap - EXIT
|
|
echo_git # end with blank line
|
|
}
|
|
|
|
# do_push PUSHARGS (multiple lines like +src:dst, with both + and src opt.)
|
|
do_push()
|
|
{
|
|
# Security protocol:
|
|
# Each git packfile is encrypted and then named for the encrypted
|
|
# file's hash. The manifest is updated with the pack id.
|
|
# The manifest is encrypted.
|
|
local remote_has= remote_want= prefix_= suffix_= line_= new_branch=
|
|
|
|
ensure_connected
|
|
check_recipients
|
|
|
|
if iseq "$Did_find_repo" "no"
|
|
then
|
|
make_new_repo
|
|
fi
|
|
|
|
trap 'rm -f "$TmpPack_Encrypted" "$TmpObjlist"' EXIT
|
|
if isnonnull "$Branchlist"
|
|
then
|
|
remote_has=$(xecho "$Branchlist" |
|
|
cut -f1 -d' ' | sed -e 's/^\(.\)/^&/')
|
|
fi
|
|
|
|
while read line_ # from <<
|
|
do
|
|
# +src:dst -- remove leading + then split at :
|
|
splitcolon "${line_#+}"
|
|
if isnonnull "$prefix_"
|
|
then
|
|
remote_want=$(append "$remote_want" "$prefix_")
|
|
Branchlist=$(append "$Branchlist" \
|
|
"$(safe_git_rev_parse "$prefix_") $suffix_")
|
|
else
|
|
: # FIXME delete branch
|
|
fi
|
|
done <<EOF
|
|
$1
|
|
EOF
|
|
|
|
Branchlist=$(xecho "$Branchlist" | sort_stable_k2 | tac | uniq -s40)
|
|
|
|
TmpPack_Encrypted="$Localdir/tmp_pack_ENCRYPTED_.$$"
|
|
TmpObjlist="$Localdir/tmp_packrevlist.$$"
|
|
|
|
append "$remote_has" "$remote_want" |
|
|
git rev-list --objects --stdin -- |
|
|
tee "$TmpObjlist" |
|
|
git pack-objects --stdout | ENCRYPT > "$TmpPack_Encrypted"
|
|
# Only send pack if we have any objects to send
|
|
if [ -s "$TmpObjlist" ]
|
|
then
|
|
pack_id=$(pack_hash < "$TmpPack_Encrypted")
|
|
Packlist=$(append "$Packlist" "$Packpfx$pack_id")
|
|
PUT "$URL" "$pack_id" < "$TmpPack_Encrypted"
|
|
fi
|
|
|
|
rm -f "$TmpPack_Encrypted"
|
|
rm -f "$TmpObjlist"
|
|
trap - EXIT
|
|
|
|
# Update manifest
|
|
echo_info "Encrypting manifest to \"$Recipients\""
|
|
echo_info "Requesting manifest key signature"
|
|
|
|
TmpManifest_Enc="$Localdir/manifest.$$"
|
|
trap 'rm -f "$TmpManifest_Enc"' EXIT
|
|
|
|
(xecho "$Masterkey"
|
|
xecho "$Branchlist"
|
|
xecho "$Packlist"
|
|
xecho "repo $Repoid") |
|
|
PRIVENCRYPT "$Recipients" > "$TmpManifest_Enc"
|
|
|
|
PUT "$URL" "$Repoid" < "$TmpManifest_Enc"
|
|
|
|
PUT_FINAL "$URL"
|
|
|
|
rm -f "$TmpManifest_Enc"
|
|
trap - EXIT
|
|
|
|
# ok all updates (not deletes)
|
|
xecho "$1" | while read line_
|
|
do
|
|
# +src:dst -- remove leading + then split at :
|
|
splitcolon "${line_#+}"
|
|
if isnull "$prefix_"
|
|
then
|
|
echo_git "error $suffix_ delete not supported yet"
|
|
else
|
|
echo_git "ok $suffix_"
|
|
fi
|
|
done
|
|
|
|
echo_git
|
|
}
|
|
|
|
# Main program, check $URL is supported
|
|
NAME=$1
|
|
URL=$2
|
|
( isurl ssh "$URL" || isurl sftp "$URL" ||
|
|
isurl gitception "$URL" || isnull ${URL##/*} ) ||
|
|
echo_die "Supported URLs: gitception://<giturl>, Absolute path, sftp://, ssh://"
|
|
|
|
mkdir -p "$Localdir"
|
|
|
|
while read Input
|
|
do
|
|
#echo_info "Got: $Input ($GITCEPTION)"
|
|
case "$Input" in
|
|
capabilities)
|
|
do_capabilities
|
|
;;
|
|
list|list\ for-push)
|
|
do_list
|
|
;;
|
|
fetch\ *)
|
|
args_="${Input##fetch }"
|
|
while read InputX
|
|
do
|
|
case "$InputX" in
|
|
fetch*)
|
|
args_= #ignored
|
|
;;
|
|
*)
|
|
break
|
|
;;
|
|
esac
|
|
done
|
|
do_fetch "$args_"
|
|
;;
|
|
push\ *)
|
|
args_="${Input##push }"
|
|
while read InputX
|
|
do
|
|
#echo_info "Got: (for push) $InputX"
|
|
case "$InputX" in
|
|
push\ *)
|
|
args_=$(append "$args_" "${InputX#push }")
|
|
;;
|
|
*)
|
|
break
|
|
;;
|
|
esac
|
|
done
|
|
do_push "$args_"
|
|
;;
|
|
?*)
|
|
echo_die "Unknown input!"
|
|
;;
|
|
*)
|
|
#echo_info "Blank line, we are done"
|
|
CLEAN_FINAL "$URL"
|
|
exit 0
|
|
;;
|
|
esac
|
|
done
|