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download/git: try to recover from utterly-broken repositories

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In some cases, the repository may be in a state we can't automatically
recover from, especially since we must still support oldish git versions
that do not provide the necessary commands or options thereof.

As a last-ditch recovery, delete the repository and recreate the cache
from scratch.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Yann E. MORIN 2018-05-01 10:44:12 +02:00 committed by Thomas Petazzoni
parent 428a0649ff
commit b7efb43e86
1 changed files with 34 additions and 3 deletions
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37
support/download/git
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@ -1,7 +1,7 @@
#!/usr/bin/env bash
# We want to catch any unexpected failure, and exit immediately
set -e
set -E
# Download helper for git, to be called from the download wrapper script
#
@ -16,6 +16,33 @@ set -e
# Environment:
# GIT : the git command to call
# Save our path and options in case we need to call ourselves again
myname="${0}"
declare -a OPTS=("${@}")
# This function is called when an error occurs. Its job is to attempt a
# clone from scratch (only once!) in case the git tree is borked, or in
# case an unexpected and unsupported situation arises with submodules
# or uncommitted stuff (e.g. if the user manually mucked around in the
# git cache).
_on_error() {
local ret=${?}
printf "Detected a corrupted git cache.\n" >&2
if ${BR_GIT_BACKEND_FIRST_FAULT:-false}; then
printf "This is the second time in a row; bailing out\n" >&2
exit ${ret}
fi
export BR_GIT_BACKEND_FIRST_FAULT=true
printf "Removing it and starting afresh.\n" >&2
popd >/dev/null
rm -rf "${git_cache}"
exec "${myname}" "${OPTS[@]}" || exit ${ret}
}
verbose=
recurse=0
while getopts "${BR_BACKEND_DL_GETOPTS}" OPT; do
@ -39,6 +66,9 @@ git_cache="${dl_dir}/git"
mkdir -p "${git_cache}"
pushd "${git_cache}" >/dev/null
# Any error now should try to recover
trap _on_error ERR
# Caller needs to single-quote its arguments to prevent them from
# being expanded a second time (in case there are spaces in them)
_git() {
@ -114,8 +144,9 @@ if ! _git fetch origin "'${cset}:${cset}'" >/dev/null 2>&1; then
printf "Could not fetch special ref '%s'; assuming it is not special.\n" "${cset}"
fi
# Check that the changeset does exist. If it does not, no reason to go
# on, we can fast-track to the exit path.
# Check that the changeset does exist. If it does not, re-cloning from
# scratch won't help, so we don't want to trash the repository for a
# missing commit. We just exit without going through the ERR trap.
if ! _git rev-parse --quiet --verify "'${cset}^{commit}'" >/dev/null 2>&1; then
printf "Commit '%s' does not exist in this repository\n." "${cset}"
exit 1