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2018-05-30Merge branch 'jk/snprintf-truncation'Libravatar Junio C Hamano1-10/+4
Avoid unchecked snprintf() to make future code auditing easier. * jk/snprintf-truncation: fmt_with_err: add a comment that truncation is OK shorten_unambiguous_ref: use xsnprintf fsmonitor: use internal argv_array of struct child_process log_write_email_headers: use strbufs http: use strbufs instead of fixed buffers
2018-05-21fsmonitor: use internal argv_array of struct child_processLibravatar René Scharfe1-10/+4
Avoid magic array sizes and indexes by constructing the fsmonitor command line using the embedded argv_array of the child_process. The resulting code is shorter and easier to extend. Getting rid of the snprintf() calls is a bonus -- even though the buffers were big enough here to avoid truncation -- as it makes auditing the remaining callers easier. Inspired-by: Jeff King <peff@peff.net> Signed-off-by: Rene Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-04-25Merge branch 'bp/fsmonitor-prime-index'Libravatar Junio C Hamano1-0/+3
The index file is updated to record the fsmonitor section after a full scan was made, to avoid wasting the effort that has already spent. * bp/fsmonitor-prime-index: fsmonitor: force index write after full scan
2018-04-25Merge branch 'bp/fsmonitor-bufsize-fix'Libravatar Junio C Hamano1-1/+1
Fix an unexploitable (because the oversized contents are not under attacker's control) buffer overflow. * bp/fsmonitor-bufsize-fix: fsmonitor: fix incorrect buffer size when printing version number
2018-04-11fsmonitor: force index write after full scanLibravatar Ben Peart1-0/+3
fsmonitor currently only flags the index as dirty if the extension is being added or removed. This is a performance optimization that recognizes you can stat() a lot of files in less time than it takes to write out an updated index. This patch makes a small enhancement and flags the index dirty if we end up having to stat() all files and scan the entire working directory. The assumption being that must be expensive or you would not have turned on the feature. Signed-off-by: Ben Peart <benpeart@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-04-11fsmonitor: fix incorrect buffer size when printing version numberLibravatar Ben Peart1-1/+1
This is a trivial bug fix for passing the incorrect size to snprintf() when outputting the version. It should be passing the size of the destination buffer rather than the size of the value being printed. Signed-off-by: Ben Peart <benpeart@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-02-07dir.c: ignore paths containing .git when invalidating untracked cacheLibravatar Nguyễn Thái Ngọc Duy1-1/+1
read_directory() code ignores all paths named ".git" even if it's not a valid git repository. See treat_path() for details. Since ".git" is basically invisible to read_directory(), when we are asked to invalidate a path that contains ".git", we can safely ignore it because the slow path would not consider it anyway. This helps when fsmonitor is used and we have a real ".git" repo at worktree top. Occasionally .git/index will be updated and if the fsmonitor hook does not filter it, untracked cache is asked to invalidate the path ".git/index". Without this patch, we invalidate the root directory unncessarily, which: - makes read_directory() fall back to slow path for root directory (slower) - makes the index dirty (because UNTR extension is updated). Depending on the index size, writing it down could also be slow. A note about the new "safe_path" knob. Since this new check could be relatively expensive, avoid it when we know it's not needed. If the path comes from the index, it can't contain ".git". If it does contain, we may be screwed up at many more levels, not just this one. Noticed-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-10fsmonitor: store fsmonitor bitmap before splitting indexLibravatar Alex Vandiver1-8/+12
ba1b9cac ("fsmonitor: delay updating state until after split index is merged", 2017-10-27) resolved the problem of the fsmonitor data being applied to the non-base index when reading; however, a similar problem exists when writing the index. Specifically, writing of the fsmonitor extension happens only after the work to split the index has been applied -- as such, the information in the index is only for the non-"base" index, and thus the extension information contains only partial data. When saving, compute the ewah bitmap before the index is split, and store it in the fsmonitor_dirty field, mirroring the behavior that occurred during reading. fsmonitor_dirty is kept from being leaked by being freed when the extension data is written -- which always happens precisely once, no matter the split index configuration. Signed-off-by: Alex Vandiver <alexmv@dropbox.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-01fsmonitor: delay updating state until after split index is mergedLibravatar Alex Vandiver1-16/+24
If the fsmonitor extension is used in conjunction with the split index extension, the set of entries in the index when it is first loaded is only a subset of the real index. This leads to only the non-"base" index being marked as CE_FSMONITOR_VALID. Delay the expansion of the ewah bitmap until after tweak_split_index has been called to merge in the base index as well. The new fsmonitor_dirty is kept from being leaked by dint of being cleaned up in post_read_index_from, which is guaranteed to be called after do_read_index in read_index_from. Signed-off-by: Alex Vandiver <alexmv@dropbox.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-10-30fsmonitor: set the PWD to the top of the working treeLibravatar Alex Vandiver1-0/+1
The fsmonitor command inherits the PWD of its caller, which may be anywhere in the working copy. This makes is difficult for the fsmonitor command to operate on the whole repository. Specifically, for the watchman integration, this causes each subdirectory to get its own watch entry. Set the CWD to the top of the working directory, for consistency. Signed-off-by: Alex Vandiver <alexmv@dropbox.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-10-01fsmonitor: teach git to optionally utilize a file system monitor to speed up ↵Libravatar Ben Peart1-0/+253
detecting new or changed files. When the index is read from disk, the fsmonitor index extension is used to flag the last known potentially dirty index entries. The registered core.fsmonitor command is called with the time the index was last updated and returns the list of files changed since that time. This list is used to flag any additional dirty cache entries and untracked cache directories. We can then use this valid state to speed up preload_index(), ie_match_stat(), and refresh_cache_ent() as they do not need to lstat() files to detect potential changes for those entries marked CE_FSMONITOR_VALID. In addition, if the untracked cache is turned on valid_cached_dir() can skip checking directories for new or changed files as fsmonitor will invalidate the cache only for those directories that have been identified as having potential changes. To keep the CE_FSMONITOR_VALID state accurate during git operations; when git updates a cache entry to match the current state on disk, it will now set the CE_FSMONITOR_VALID bit. Inversely, anytime git changes a cache entry, the CE_FSMONITOR_VALID bit is cleared and the corresponding untracked cache directory is marked invalid. Signed-off-by: Ben Peart <benpeart@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>